EP0102060A2 - Device for automatically controlling the height of the preliminary strike-off of a conforming plate finisher - Google Patents

Device for automatically controlling the height of the preliminary strike-off of a conforming plate finisher Download PDF

Info

Publication number
EP0102060A2
EP0102060A2 EP83108353A EP83108353A EP0102060A2 EP 0102060 A2 EP0102060 A2 EP 0102060A2 EP 83108353 A EP83108353 A EP 83108353A EP 83108353 A EP83108353 A EP 83108353A EP 0102060 A2 EP0102060 A2 EP 0102060A2
Authority
EP
European Patent Office
Prior art keywords
scraper
level
pressure plate
point
height
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP83108353A
Other languages
German (de)
French (fr)
Other versions
EP0102060B1 (en
EP0102060A3 (en
Inventor
Gerd Sonntag
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Heilit & Woerner Bau-Ag
Heilit und Woerner Bau AG
Original Assignee
Heilit & Woerner Bau-Ag
Heilit und Woerner Bau AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Heilit & Woerner Bau-Ag, Heilit und Woerner Bau AG filed Critical Heilit & Woerner Bau-Ag
Publication of EP0102060A2 publication Critical patent/EP0102060A2/en
Publication of EP0102060A3 publication Critical patent/EP0102060A3/en
Application granted granted Critical
Publication of EP0102060B1 publication Critical patent/EP0102060B1/en
Expired legal-status Critical Current

Links

Images

Classifications

    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
    • E01C19/42—Machines for imparting a smooth finish to freshly-laid paving courses other than by rolling, tamping or vibrating
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
    • E01C19/30—Tamping or vibrating apparatus other than rollers ; Devices for ramming individual paving elements
    • E01C19/34—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight
    • E01C19/40—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight adapted to impart a smooth finish to the paving, e.g. tamping or vibrating finishers
    • E01C19/405—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight adapted to impart a smooth finish to the paving, e.g. tamping or vibrating finishers with spreading-out, levelling or smoothing means other than the tamping or vibrating means for compacting or smoothing, e.g. with screws for spreading-out the previously dumped material, with non-vibratory lengthwise reciprocated smoothing beam
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/22—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for consolidating or finishing laid-down unset materials
    • E01C19/30—Tamping or vibrating apparatus other than rollers ; Devices for ramming individual paving elements
    • E01C19/34—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight
    • E01C19/40—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight adapted to impart a smooth finish to the paving, e.g. tamping or vibrating finishers
    • E01C19/407—Power-driven rammers or tampers, e.g. air-hammer impacted shoes for ramming stone-sett paving; Hand-actuated ramming or tamping machines, e.g. tampers with manually hoisted dropping weight adapted to impart a smooth finish to the paving, e.g. tamping or vibrating finishers with elements or parts partly or fully immersed in or penetrating into the material to act thereon, e.g. immersed vibrators or vibrating parts, kneading tampers, spaders
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C23/00—Auxiliary devices or arrangements for constructing, repairing, reconditioning, or taking-up road or like surfaces
    • E01C23/04—Devices for laying inserting or positioning reinforcing elements or dowel bars with or without joint bodies; Removable supports for reinforcing or load transfer elements; Devices, e.g. removable forms, for making essentially horizontal ducts in paving, e.g. for prestressed reinforcements

Definitions

  • the invention relates to a device for automatically regulating the pre-stripper height of a slipform paver, which has a pre-stripper, a pressure plate which is spaced apart from it and forms an upper slipforming, and possibly a vibrating device in the intermediate area.
  • the level of paving material in the area between the scraper and the pressure plate must be kept within relatively narrow limits of, for example, + 2 cm around a setpoint of, for example, 5 cm above the underside of the pressure plate. If the level is too low, the pressure plate cuts into the liquid slurry area too much, so that accordingly less installation material gets under the pressure plate, which can result in corresponding imperfections, in particular holes, in the concrete ceiling. In addition, the top layer of the pavement produced in this way has lower strength and tends to dry out.
  • the pressure plate cuts into the concrete material too far below the approximately constant slurry layer given the concrete moisture. The result is that the concrete material under the pressure plate is too dry, so that a flat, smooth road surface can no longer be achieved. So far, the level of paving material has been regulated by hand by constantly monitoring the level and lowering the pre-scraper if the level is too high and raising the pre-scraper if the level is too low. Experienced specialists had to be provided for this activity. Manual readjustment proved to be particularly problematic in the case of two-shift production of pavements.
  • an upper concrete layer is placed on the lower concrete layer applied first.
  • a sludge layer of smaller thickness is created in the area between the preliminary scraper and the pressure plate due to the smaller concrete volume, which requires a correspondingly more precise level regulation.
  • the object of the invention is to enable automatic regulation of the pre-scraper height of a slipform paver.
  • a level sensor in the area between the preliminary scraper and pressure plate for the paving material a height adjustment drive for the preliminary scraper and a control device which compares a determined actual level of the paving material with a target level and, in the direction of a reduction in the level difference, the Height adjustment drive controls.
  • a particularly simple structure of the device is obtained when it operates in the manner of a three-point control, one switch position being the neutral position and the other two switch positions following the commands "preliminary wipers raise “or lower pre-scraper".
  • a follow-up control is provided according to the invention with different target level values that can be entered manually.
  • the level sensor can comprise, for example, a level measuring plate sliding above the concrete surface.
  • the level sensor comprises a floating body element. This shows the level of sludge that is of particular interest.
  • the floating body element is articulated on the scraper and that the height of a reference point of the floating body element between the articulation point and the center of buoyancy is defined as the actual level, which preferably is a distance from the articulation point between 1/4 and 3/4 , better 1/3 to 2/3, ideally about half the distance between the pivot point and the center of buoyancy.
  • the position of the reference point depends not only on the actual sludge level, but also on the respective height of the scraper.
  • the time duration of the actuating signal "lower wipers" generated when the upper limit of the fluctuation range of the sludge level is exceeded consequently depends on the one hand on the degree of level deviation and on the other hand on the pre-wiping movement taking place in the opposite direction. Because of the latter movement there is a well-defined end of the control signal mentioned, which is much earlier compared to an arrangement in which the center of buoyancy is defined as the actual level.
  • the invention takes into account the fact that the sludge level change based on a change in the scraper height only follows the change in the scraper height with a relatively large time delay.
  • the floating body element preferably consists of a preferably spherical or cylindrical floating body and a connecting link carrying the floating body at one end and articulated at the other end to the scraper.
  • a floating body with connecting link is simple to manufacture and mechanically robust.
  • a measuring rod connected at the reference point to the floating body element, possibly the connecting link, is preferably articulated there, which can be coupled to a three-point switch .
  • a certain switching hysteresis can be provided in the upper and lower of the three switching points.
  • a switch actuating element which can be optionally attached to the measuring rod in various positions along the measuring rod is provided for the three-point switch, which enables simple and quick setting or readjusting of the desired level. It can be provided that the switch actuation element is articulated to a switching lever of the three-point switch and that the switch actuation element engages around the measuring rod and can be fixed on the measuring rod by means of a locking screw.
  • the height adjustment drive comprises at least one preferably double-acting hydraulic cylinder.
  • the hydraulic cylinder preferably engages the pre-scraper via a double-arm lever articulated on the pressure plate.
  • the optimal height difference between the preliminary scraper and the pressure plate is essentially independent of the height of the pressure plate.
  • the permissible swivel range of the double-arm lever articulated on the pressure plate can therefore be in a constant small range even with widely differing pressure plate heights.
  • the three-point switch directly controls a corresponding hydraulic device for the at least one hydraulic cylinder.
  • an electrical control circuit is preferably provided, which is connected to the electromechanical three-point switch and controls a hydraulic device connected to the at least one hydraulic cylinder. Such a control circuit can be changed more easily if it functions reliably, in particular with regard to its control properties.
  • the formation is designated 10.
  • a one or two-layer concrete road surface 12 is to be erected on this level.
  • auxiliary banquets 14 are first built on both sides of the longitudinal edges thereof, as indicated in FIG. 1.
  • slipform paver can also run in a conventional manner on rails which rest directly on the formation.
  • the slipform paver 16 comprises two crawler tracks 18 on the side for driving on the auxiliary banquets 14 or on stationary formwork and running rails 44 placed thereon.
  • the crawler tracks 18 are equipped with rubber studs 20.
  • a distributor 22 is arranged for the paving material 24, said manifold 22 a perpendicular to the plane of IG F. 1 reciprocating motion.
  • the slipform paver 16 comprises a sliding formwork, which consists of a horizontal pressure plate 26 and vertical side formwork, which can also be omitted when using the formwork and running rails 44.
  • vibrating elements in the form of so-called vibrating bottles 30 are distributed over the width of the resulting roadway surface 12 and are immersed in the installation material 24 distributed by the distributor 22.
  • a preliminary scraper 32 is arranged between the vibrating bottles 30 and the distributor 22. As will be explained in more detail below, the height of the preliminary scraper 32 is regulated automatically.
  • the pre-stripper 32 is rigidly attached to one end of a bent double-arm 49, which on the vertical front wall 26a of the pressure plate 26 is pivoted in the crease area and the piston rod 52a engages via a hydraulic cylinder 5 0, at the other end of the lever, a horizontal pivot axis 54 is pivotable.
  • a dowel setting device 34 is arranged at the rear end, which can be moved up and down in the vertical direction and is intended for inserting dowels 36 into the road surface 12. In the area of these dowels 36, a parting line is cut as a predetermined breaking point in a subsequent operation.
  • FIG. 2 shows the basic structure of the device according to the invention for the automatic control of the pre-scraper height.
  • the distributor 22 is omitted here.
  • the scraper 32 in the form of an elongated plate with a lower horizontal longitudinal edge and a slightly inclined upper edge towards the pressure plate 26 pushes a mountain of paving material 24 in front of it.
  • the slipform paver according to the invention is suitable both for a single-layer ceiling structure (FIG. 1) and for a two-layer structure (FIG. 2). In the latter case, a second layer 12b of wear-resistant split concrete is applied to the prefabricated first layer 12a made of less expensive round-grain concrete, which is shown in FIG. 2.
  • a particularly water-rich slurry or slurry layer 57 forms on the surface of the material 24.
  • the thickness of this slurry layer 57 is approximately constant for a given moisture level of the supplied installation material 24.
  • the horizontal underside of the pressure plate 26 lies approximately at the level of the bottom of the slurry layer 57.
  • a certain proportion of the slurry layer 57 reaches below the rounded front edge 26b of the pressure plate 26 and thus with the other installation material 24 under the pressure plate 26. This portion is essential for a smooth upper ceiling.
  • the thickness of the slurry layer on the paving material below the pressure plate 26 depends on the level c of the paving material removed from the scraper 32 in front of the pressure plate 26, this thickness can be readjusted by changing the slurry level in front of the pressure plate 26.
  • the readjustment can be based on the level h of the slurry surface, since the slurry layer 57 in front of the pressure plate 26 has an essentially constant thickness d with the concrete consistency remaining the same. It can be seen that the level can be raised by lifting the pre-stripper 32. Accordingly, the pre-stripper 32 is lowered to lower the level.
  • a cylindrical float 56 with a horizontal cylinder axis 56a, which extends transversely to the direction of movement A, is used to determine the actual level, which is immersed in the slurry layer 57 in the region above the bottles 30.
  • the floating body 56 is articulated on the inside of the preliminary scraper 32 by means of an approximately horizontally extending connecting link 58 (pivot pin 60).
  • An approximately vertical measuring rod 62 is in turn articulated on the connecting link 58, specifically at a point (reference point 64) which lies approximately halfway between the distance a from the cylinder axis 56 and the pivot pin 60.
  • the upper end of the measuring rod 62 passes through a corresponding bore of a switch actuating element 66; a locking screw 66a which is radial with respect to the measuring rod axis allows the switch actuating element to be fixed elements 66 in different height positions on the measuring rod 62.
  • an electromechanical three-point switch 68 is fastened in the area of the upper measuring rod end, the switch lever 68a of which runs horizontally in a central or neutral position and from this position in a vertical plane up to an upper end position and downwards in a lower end position is pivotable (dashed or dotted lines in FIG. 2). 2, a movable contact 68b following the lever movement is indicated, which is exposed in the central position of the lever 68a, touches the fixed contact 70a in the upper end position of the lever and the fixed contact 70b in the lower end position of the lever. Similar to the thermostat controls, the switchover from the middle position to the upper contact position and back can be provided with a switching hysteresis. The same can also be provided for the transition to the lower switching position and back.
  • the two fixed contacts 70a and 70b are connected to a control circuit 74 via corresponding electrical lines 72a and 72b, indicated by dash-dotted lines.
  • the circuit 74 controls a four / three-way valve 76 via a control line 78.
  • the two upper connections of the valve 76 are connected on the one hand to a hydraulic line 80a, which leads to the pressure connection of a hydraulic pump 82, and on the other hand to a return line 80b, which is in one Hydraulic oil reservoir 84 opens.
  • the pump 82 is supplied with pressure fluid from the reservoir 84 via a line 80c.
  • the two lower connections of the valve 76 in FIG. 2 are connected to the two connections 50a and 50b of the double-acting cylinder 50 via hydraulic lines 80d and 80e.
  • One at the Piston rod 52a provided in the cylinder interior working piston 52b divides the cylinder interior into two working spaces, the working space surrounding the piston rod 52a planar is connected to the connection 50b and the other to the connection 50a.
  • valve 76 In the central position of valve 76 shown in FIG. 2, line 80a is connected to line 80b; the lines 80d and 80e, on the other hand, are shut off by the valve 76.
  • the piston 52b can therefore not move in the axial direction within the cylinder 50, so that accordingly the preliminary scraper 32 is immovable relative to the pressure plate 26 via the blocked piston rod 52a and the double arm lever. If for some reason the level of the paving material 24 including the slurry layer 57 rises relative to the pressure plate 26, the float 56 is raised and with it the measuring rod 62, but by half the way. Since the free end of the switching lever 68a of the switch 68 is articulated on the switch actuating element 66, the switching lever 68a pivots in accordance with the movement of the measuring rod.
  • the pump 82 If the pump 82 does not run continuously, it is started by the circuit 74 via a line 74a, whereupon the corresponding hydraulic pressure causes the piston rod 52a to extend and thus to turn on Lowering the preliminary scraper 32. Since the level h changes accordingly only with a relatively large time delay after the beginning of the lowering of the preliminary scraper 32, the cylinder axis 56a forms a momentarily spatially constant pivot axis with respect to the connecting link 58 when the preliminary scraper 32 is lowered. As a result, it lowers the measuring rod 62 down by half the distance covered vertically downwards by the scraper 32 until finally the switch 68 switches back to its neutral central position. The control circuit 74 then switches the valve 76 back into the central position shown in FIG. 2, in which the preliminary scraper 32 is stationary relative to the pressure plate 26.
  • the control circuit 74 switches the valve 76 into the third switching position in which the lines 80a and 80e and the lines 80b and 80d are connected to one another.
  • the piston rod 52a is consequently pushed into the cylinder 50 and the preliminary scraper is raised accordingly until the switch 68 is finally switched to its central position via the moving switching rod 62.
  • the switch actuating element 66 must be attached to the measuring rod 62 at a comparatively lower point on the latter; for lowering the target level of the S must chalterbetutzrienselement 66 are shifted upward.
  • the target height h can be in a range of 11 ⁇ 2 cm kept under little mechanical effort, at a
  • Top layer 12b thickness from 6 to 7 cm.
  • the thickness of the lower layer 12 a is about 15 cm.
  • the height control is based on the height h 'of the reference point 64 as the actual value. Accordingly, the sum of the sludge level setpoint and the distance b of the cylinder axis 56 forming the center of buoyancy of the floating body 56 from the sludge surface results as the desired value.
  • the height h in turn is composed of the thickness c of the actual concrete layer and the thickness d of the liquid slurry layer 57 .

Abstract

1. Sliding formwork maker (16) having a prescraper (32) fitted vertically adjustably on a frame (16a), a pressure plate spaced therefrom and forming an upper sliding formwork and a vibrator (30) in the intermediate region, characterized by a slit level sensor (56, 58, 62) in the region between pre-scraper (32) and pressure plate (26) for the fill material (24), a vertical adjustement drive (49, 50, 82) for the Pre-scraper (32) and a regulating device (68, 74, 76) which compares an ascertained actual silt level with an ideal silt level and controls the vertical adjustement drive in the direction of a reduction of the difference of level.

Description

Die Erfindung betrifft eine Vorrichtung zur selbsttätigen Regelung der Vorabstreiferhöhe eines Gleitschalungsfertigers, welcher einen Vorabstreifer, eine von diesem beabstandete, eine obere Gleitschalung bildende Druckplatte und ggf. eine Rütteleinrichtung im Zwischenbereich aufweist.The invention relates to a device for automatically regulating the pre-stripper height of a slipform paver, which has a pre-stripper, a pressure plate which is spaced apart from it and forms an upper slipforming, and possibly a vibrating device in the intermediate area.

Bei der Herstellung von Beton-Fahrbahndecken mittels Gleitschalungsfertigern muß das Einbaumaterialniveau im Bereich zwischen Vorabstreifer und Druckplatte innerhalb relativ enger Grenzen von beispielsweise + 2 cm um einen Sollwert von beispielsweise 5 cm oberhalb der Druckplattenunterseite gehalten werden. Bei zu tiefem Niveau schneidet die Druckplatte zu stark in den flüssigen Schlämmebereich ein, so daß dementsprechend weniger Einbaumaterial unter die Druckplatte gelangt, was entsprechende Fehlstellen, insbesondere Löcher, in der Betondecke zur Folge haben kann. Hinzu kommt, daß die oberste Schicht der auf diese Weise hergestellten Fahrbahndecke geringere Festigkeit aufweist und zu Trockenschwund neigt. Ist das Niveau des Einbaumaterials, d.h. der Schlämmeschicht oberhalb des Betonmaterials im Falle der Verwendung einer Rütteleinrichtung in diesem Bereiche zu hoch, so schneidet die Druckplatte zu weit unterhalb der bei gegebener Betonfeuchtigkeit angenähert gleichbleibend dicken Schlämmeschicht in das Betonmaterial ein. Die Folge ist, daß das unter die Druckplatte gelangende Betonmaterial zu trocken ist, so daß eine ebene glatte Fahrbahnoberfläche nicht mehr erzielt werden kann. Bisher wurde das Einbaumaterialniveau dadurch von Hand geregelt, daß man das Niveau ständig beobachtete und bei zu hohem Niveau den Vorabstreifer absenkte und bei zu niedrigem Niveau den Vorabstreifer anhob. Für diese Tätigkeit mußten erfahrene Fachkräfte bereitgestellt werden. Als besonders problematisch erwies sich die manuelle Nachregelung im Falle einer Fahrbahndeckenfertigung in zwei Schichten. Bei dieser kostensparenden Bauweise wird auf die zuerst aufgetragene Unterbetonschicht eine Oberbetonschicht gelegt. Bei der Fertigung dieser Oberbetonschicht entsteht im Bereich zwischen Vorabstreifer und Druckplatte aufgrund des geringeren Betonvolumens eine Schlammeschicht geringerer Dicke, was eine entsprechend genauere Niveau-Regulierung erfordert.When manufacturing concrete road surfaces using slipform pavers, the level of paving material in the area between the scraper and the pressure plate must be kept within relatively narrow limits of, for example, + 2 cm around a setpoint of, for example, 5 cm above the underside of the pressure plate. If the level is too low, the pressure plate cuts into the liquid slurry area too much, so that accordingly less installation material gets under the pressure plate, which can result in corresponding imperfections, in particular holes, in the concrete ceiling. In addition, the top layer of the pavement produced in this way has lower strength and tends to dry out. If the level of the paving material, ie the slurry layer above the concrete material, is too high when using a vibrating device in this area, the pressure plate cuts into the concrete material too far below the approximately constant slurry layer given the concrete moisture. The result is that the concrete material under the pressure plate is too dry, so that a flat, smooth road surface can no longer be achieved. So far, the level of paving material has been regulated by hand by constantly monitoring the level and lowering the pre-scraper if the level is too high and raising the pre-scraper if the level is too low. Experienced specialists had to be provided for this activity. Manual readjustment proved to be particularly problematic in the case of two-shift production of pavements. With this cost-saving construction method, an upper concrete layer is placed on the lower concrete layer applied first. During the production of this upper concrete layer, a sludge layer of smaller thickness is created in the area between the preliminary scraper and the pressure plate due to the smaller concrete volume, which requires a correspondingly more precise level regulation.

Die Aufgabe der Erfindung liegt darin, eine selbsttätige Regelung der Vorabstreiferhöhe eines Gleitschalungsfertigers zu ermöglichen.The object of the invention is to enable automatic regulation of the pre-scraper height of a slipform paver.

Diese Aufgabe wird gelöst durch einen Niveausensor im Bereich zwischen Vorabstreifer und Druckplatte für das Einbaumaterial, einen Höhenverstellantrieb für den Vorabstreifer und eine Regeleinrichtung, welche ein ermittelte Ist-Niveau des Einbaumaterials mit einem Soll-Niveau vergleicht und, in Richtung einer Verringerung der Niveaudifferenz, den Höhenverstellantrieb steuert.This object is achieved by a level sensor in the area between the preliminary scraper and pressure plate for the paving material, a height adjustment drive for the preliminary scraper and a control device which compares a determined actual level of the paving material with a target level and, in the direction of a reduction in the level difference, the Height adjustment drive controls.

Besonders einfacher Aufbau der Vorrichtung ergibt sich dann, wenn diese nach Art einer Drei-Punkt-Regelung arbeitet, wobei eine Schaltstellung die Neutralstellung ist und die anderen beiden Schaltstellungen den Befehlen "Vorabstreifer anheben" bzw. Vorabstreifer absenken" entsprechen.A particularly simple structure of the device is obtained when it operates in the manner of a three-point control, one switch position being the neutral position and the other two switch positions following the commands "preliminary wipers raise "or lower pre-scraper".

Es kann sich als notwendig erweisen, von Hand das Soll-Niveau von Zeit zu Zeit abzuändern, insbesondere zur Anpassung an wechselnde Betonqualitäten. Hierzu ist erfindungsgemäß eine Folgeregelung mit von Hand eingebbaren unterschiedlichen Soll-Niveauwerten vorgesehen.It may prove necessary to manually change the target level from time to time, especially to adapt to changing concrete qualities. For this purpose, a follow-up control is provided according to the invention with different target level values that can be entered manually.

Die Erfindung läßt sich mit Erfolg auch bei Gleitschalungsfertigern einsetzen, bei denen der Beton im Bereich zwischen Vorabstreifer und Druckplatte nicht gerüttelt wird. Der Niveau-Sensor kann in diesem Falle beispielsweise eine oberhalb der Betonoberfläche entlanggleitenden Niveau-Meßplatte umfassen. Im Falle der bevorzugten Verwendung der Regelvorrichtung in Verbindung mit einem Gleitschalungsfertiger mit Rütteleinrichtung umfaßt der Niveau- sensor ein Schwimmkörperelement. Dieses zeigt das vor allem interessierende Schlämmeniveau unmittelbar an.The invention can also be used successfully in slipform pavers in which the concrete in the area between the scraper and pressure plate is not shaken. In this case, the level sensor can comprise, for example, a level measuring plate sliding above the concrete surface. In the case of the preferred use of the control device in connection with a slipform paver with vibrating device, the level sensor comprises a floating body element. This shows the level of sludge that is of particular interest.

In einer besonders bevorzugten Ausführungsform ist vorgesehen, daß das Schwimmkörperelement am Vorabstreifer angelenkt ist und daß als Ist-Niveau die Höhe eines Bezugspunktes des Schwimmkörperelements zwischen dem Anlenkpunkt und dem Auftriebsmittelpunkt festgelegt wird, welcher vorzugsweise einen Abstand vom Anlenkpunkt zwischen 1/4 und 3/4, besser 1/3 bis 2/3, am besten etwa der Hälfte des Abstandes Anlenkpunkt-Auftriebsmittelpunkt aufweist. Ein besonderer Vorteil dieser Anordnung liegt darin, daß die Lage des Bezugspunktes nicht nur vom tatsächlichen Schlämmeniveau abhängt,sondern auch von der jeweiligen Höhe des Vorabstreifers. Die Zeitdauer des bei einem Überschreiten, z.B. der oberen Grenze des Schwankungsbereichs des Schlämmeniveaus erzeugten Stellsignals "Abstreifer senken", hängt demzufolge zum einen vom Grad der Niveauabweichung und zum anderen von der in entgegengesetzter Richtung erfolgenden Vorabstreiferbewegung ab. Aufgrund der letzteren Bewegung ergibt sich ein wohl definiertes Ende des genannten Stellsignals, welches wesentlich früher liegt verglichen mit einer Anordnung, bei der als Ist-Niveau der Auftriebsmittelpunkt festgelegt wird. Die Erfindung trägt dem Umstand Rechnung, daß die auf eine Änderung der Vorabstreiferhöhe beruhende Schlämmeniveauänderung erst mit relativ großer zeitlichen Verzögerung der Vorabstreiferhöhenänderung nachfolgt.In a particularly preferred embodiment it is provided that the floating body element is articulated on the scraper and that the height of a reference point of the floating body element between the articulation point and the center of buoyancy is defined as the actual level, which preferably is a distance from the articulation point between 1/4 and 3/4 , better 1/3 to 2/3, ideally about half the distance between the pivot point and the center of buoyancy. A particular advantage of this arrangement is that the position of the reference point depends not only on the actual sludge level, but also on the respective height of the scraper. The time duration of the actuating signal "lower wipers" generated when the upper limit of the fluctuation range of the sludge level is exceeded, consequently depends on the one hand on the degree of level deviation and on the other hand on the pre-wiping movement taking place in the opposite direction. Because of the latter movement there is a well-defined end of the control signal mentioned, which is much earlier compared to an arrangement in which the center of buoyancy is defined as the actual level. The invention takes into account the fact that the sludge level change based on a change in the scraper height only follows the change in the scraper height with a relatively large time delay.

Bevorzugt besteht das Schwimmkörperelement aus einem vorzugsweise sphärischen oder zylindrischen Schwimmkörper und einem an einem Ende den Schwimmkörper tragenden und am anderen Ende am Vorabstreifer angelenkten Verbindungslenker. Ein derartiger Schwimmkörper mit Verbindungslenker ist einfach in der Herstellung und mechanisch robust.The floating body element preferably consists of a preferably spherical or cylindrical floating body and a connecting link carrying the floating body at one end and articulated at the other end to the scraper. Such a floating body with connecting link is simple to manufacture and mechanically robust.

Der für die rauhen Einsatzbedingungen des Gleitschalungsfertigers wesentliche einfache, mechanisch robuste Aufbau wird dadurch gefördert, daß eine im Bezugspunkt mit dem Schwimmkörperelement, ggf. dem Verbindungslenker, verbundene, vorzugsweise dort angelenkte Meßstange vorgesehen ist, welche mit einem Drei-Punkt-Schalter verkoppelt sein kann. Hierbei kann im oberen und unteren der drei Schaltpunkte eine gewisse Schalthysterese vorgesehen sein.The simple, mechanically robust construction that is essential for the rough operating conditions of the slipform paver is promoted by the fact that a measuring rod connected at the reference point to the floating body element, possibly the connecting link, is preferably articulated there, which can be coupled to a three-point switch . A certain switching hysteresis can be provided in the upper and lower of the three switching points.

Erfindungsgemäß ist ein an der Meßstange in verschiedenen Positionen längs der Meßstange wahlweise anbringbares Schalterbetätigungselement für den Drei-Punkt-Schalter vorgesehen, welches ein einfaches und schnelles Einstellen- bzw. Nachstellen des Soll-Niveaus ermöglicht. Hierbei kann vorgesehen sein, daß das Schalterbetätigungselement mit einem Schalthebel des Drei-Punkt-Schalters gelenkig verbunden ist und daß das Schalterbetätigungselement die Meßstange umgreift und mittels einer Feststellschraube an der Meßstange festlegbar ist.According to the invention, a switch actuating element which can be optionally attached to the measuring rod in various positions along the measuring rod is provided for the three-point switch, which enables simple and quick setting or readjusting of the desired level. It can be provided that the switch actuation element is articulated to a switching lever of the three-point switch and that the switch actuation element engages around the measuring rod and can be fixed on the measuring rod by means of a locking screw.

Ferner wird vorgeschlagen, daß der Höhenverstellantrieb wenigstens einen vorzugsweise doppelt wirkenden Hydraulikzylinder umfaßt. Vorzugsweise greift dabei der Hydraulikzylinder über einen an der Druckplatte angelenkten Doppelarmhebel an den Vorabstreifer an. Die optimale Höhendifferenz zwischen Vorabstreifer und Druckplatte ist im wesentlichen unabhängig von der Höhe der Druckplatte. Der zulässige Schwenkbereich des an der Druckplatte angelenkten Doppelarmhebels kann demnach auch bei stark unterschiedlichen Druckplattenhöhen in einem konstanten kleinen Bereich liegen.It is also proposed that the height adjustment drive comprises at least one preferably double-acting hydraulic cylinder. The hydraulic cylinder preferably engages the pre-scraper via a double-arm lever articulated on the pressure plate. The optimal height difference between the preliminary scraper and the pressure plate is essentially independent of the height of the pressure plate. The permissible swivel range of the double-arm lever articulated on the pressure plate can therefore be in a constant small range even with widely differing pressure plate heights.

Es ist denkbar, daß der Drei-Punkt-Schalter unmittelbar eine entsprechende Hydraulikeinrichtung für den wenigstens einen Hydraulikzylinder steuert. Bevorzugt ist jedoch eine elektrische Regelschaltung vorgesehen, welche mit dem elektromechanischen Drei-Punkt-Schalter verbunden ist und eine mit dem wenigstens einen Hydraulikzylinder verbundene Hydraulikeinrichtung steuert. Eine derartige Regelschaltung läßt sich bei zuverlässiger Funktion im Bedarfsfalle einfacher abändern, insbesondere in bezug auf ihre Regeleigenschaften.It is conceivable that the three-point switch directly controls a corresponding hydraulic device for the at least one hydraulic cylinder. However, an electrical control circuit is preferably provided, which is connected to the electromechanical three-point switch and controls a hydraulic device connected to the at least one hydraulic cylinder. Such a control circuit can be changed more easily if it functions reliably, in particular with regard to its control properties.

Die Erfindung wird im folgenden an einem bevorzugten Ausführungsbeispiel anhand der Zeichnung erläutert.The invention is explained below using a preferred embodiment with reference to the drawing.

Es zeigt:It shows:

  • Fig. 1 eine schematische Seitenansicht teilweise im Längsschnitt eines erfindungsgemäßen Gleitschaltungsfertigers; undFigure 1 is a schematic side view, partly in longitudinal section, of a slip-circuit paver according to the invention; and
  • Fig. 2 das Detail lIder Fig. 1 in vergrößertem Maßstab mit einem vereinfachten Hydraulik-Schaltschema.Fig. 2 shows the detail lIder Fig. 1 on an enlarged scale with a simplified hydraulic circuit diagram.

Die beiden Figuren sind rein schematischer Art.The two figures are purely schematic.

In den Fig. 1 und 2 ist das Planum mit 10 bezeichnet. Auf diesem Planum soll eine ein- oder zweischichtige Betonfahrbahndecke 12 errichtet werden. Zur Errichtung dieser Betonfahrbahndecke 12 werden zunächst beidseits von deren Längsrändern Hilfsbankette 14 errichtet, wie in Fig. 1 angedeutet. Nach der Fertigstellung der Hilfsbankette 14 gemäß DE-OS 30 32 495 werden diese von einem Gleitschalungsfertiger befahren, der ganz allgemein mit 16 bezeichnet ist. Der Gleitschalungsfertiger kann jedoch auch in herkömmlicher Weise auf Schienen laufen, welche unmittelbar auf dem Planum ruhen. Im dargestellten Beispiel umfaßt der Gleitschalungsfertiger 16 zwei seitliche Raupenfahrwerke 18 zum Befahren der Hilfsbankette 14 oder von auf diese aufgelegten stationären Schalungs- und Laufschienen 44. Die Raupenfahrwerke 18 sind mit Gummistollen 20 bestückt. Am vorderen Ende des Gleitschalungsfertigers 16 ist ein Verteiler 22 für das Einbaumaterial 24 angeordnet, wobei dieser Verteiler 22 eine senkrecht zur Zeichenebene der Fig. 1 hin- und hergehende Bewegung ausführt. Weiter umfaßt der Gleitschalungsfertiger 16 eineGleitschalung, welche aus einer horizontalen Druckplatte 26 und vertikalen Seitenschalungen besteht, welche bei Verwendung der Schalungs-und Laufschienen 44 auch weggelassen werden können. In Fahrtrichtung vor der Druckplatte 26 sind über die Breite der entstehenden Fahrbahndecke 12 verteilt, Rüttlerelemente in Form sog. Rüttlerflaschen 30 angeordnet, welche in das von dem Verteiler 22 verteilte Einbaumaterial 24 eintauchen. Zwischen den Rüttlerflaschen 30 und dem Verteiler 22 ist ein Vorabstreifer 32 angeordnet. Wie im nachfolgenden noch näher erläutert werden wird, wird die Höhe des Vorabstreifers 32 selbsttätig geregelt. Hierzu ist der Vorabstreifer 32 starr an einem Ende eines abgeknickten Doppelarmhebels 49 befestigt, welcher an der vertikalen Vorderwand 26a der Druckplatte 26 im Knickbereich angelenkt ist und über einen Hydraulikzylinder 50, dessen Kolbenstange 52a am anderen Hebelende angreift, um eine horizontale Schwenkachse 54 verschwenkbar ist.1 and 2, the formation is designated 10. A one or two-layer concrete road surface 12 is to be erected on this level. In order to erect this concrete pavement 12, auxiliary banquets 14 are first built on both sides of the longitudinal edges thereof, as indicated in FIG. 1. After the completion of the auxiliary banquets 14 according to DE-OS 30 32 495, these are driven on by a slipform paver, which is generally designated 16. However, the slipform paver can also run in a conventional manner on rails which rest directly on the formation. In the example shown, the slipform paver 16 comprises two crawler tracks 18 on the side for driving on the auxiliary banquets 14 or on stationary formwork and running rails 44 placed thereon. The crawler tracks 18 are equipped with rubber studs 20. At the front end of the slip-form paver 16, a distributor 22 is arranged for the paving material 24, said manifold 22 a perpendicular to the plane of IG F. 1 reciprocating motion. Furthermore, the slipform paver 16 comprises a sliding formwork, which consists of a horizontal pressure plate 26 and vertical side formwork, which can also be omitted when using the formwork and running rails 44. In the direction of travel in front of the pressure plate 26, vibrating elements in the form of so-called vibrating bottles 30 are distributed over the width of the resulting roadway surface 12 and are immersed in the installation material 24 distributed by the distributor 22. A preliminary scraper 32 is arranged between the vibrating bottles 30 and the distributor 22. As will be explained in more detail below, the height of the preliminary scraper 32 is regulated automatically. For this purpose, the pre-stripper 32 is rigidly attached to one end of a bent double-arm 49, which on the vertical front wall 26a of the pressure plate 26 is pivoted in the crease area and the piston rod 52a engages via a hydraulic cylinder 5 0, at the other end of the lever, a horizontal pivot axis 54 is pivotable.

Auf dem Gleitschalungsfertiger 16 ist am rückwärtigen Ende ein Dübelsetzgerät 34 angeordnet, welches in vertikaler Richtung auf- und abbeweglich ist und dazu bestimmt ist, Dübel 36 in die Fahrbahndecke 12 einzusetzen. Im Bereich dieser Dübel 36 wird in einem nachfolgenden Arbeitsgang eine Trennfuge als Sollbruchstelle eingeschnitten.On the slipform paver 16, a dowel setting device 34 is arranged at the rear end, which can be moved up and down in the vertical direction and is intended for inserting dowels 36 into the road surface 12. In the area of these dowels 36, a parting line is cut as a predetermined breaking point in a subsequent operation.

In Fig. 2 ist der prinzipielle Aufbau der erfindungsgemäßen Vorrichtung zur selbsttätigen Regelung der Vorabstreiferhöhe dargestellt. Zur Vereinfachung ist hierbei der Verteiler 22 weggelassen. Der Vorabstreifer 32 in Form einer länglichen Platte mit unterer horizontaler Längskante und leicht in Richtung zur Druckplatte 26 geneigter Oberkante schiebt einen Berg Einbaumaterial 24 vor sich her. Der erfindungsgemäße Gleitschalungsfertiger eignet sich sowohl für einschichtigen Deckenaufbau (Fig. 1) als auch für zweischichtigen Aufbau (Fig. 2). In letzterem Falle wird auf die vorgefertigte erste Schicht 12a aus kostengünstigerem Rundkorn-Beton eine zweite Schicht 12b aus verschleißfestem Splitbeton in einem zweiten Arbeitsschritt aufgetragen, der in Fig. 2 dargestellt ist.2 shows the basic structure of the device according to the invention for the automatic control of the pre-scraper height. For simplification, the distributor 22 is omitted here. The scraper 32 in the form of an elongated plate with a lower horizontal longitudinal edge and a slightly inclined upper edge towards the pressure plate 26 pushes a mountain of paving material 24 in front of it. The slipform paver according to the invention is suitable both for a single-layer ceiling structure (FIG. 1) and for a two-layer structure (FIG. 2). In the latter case, a second layer 12b of wear-resistant split concrete is applied to the prefabricated first layer 12a made of less expensive round-grain concrete, which is shown in FIG. 2.

Bei der Verdichtung des Einbaumaterials mit Hilfe der Rüttler 30 bildet sich eine besonders wasserreiche Schlämme-oder Schlempe-Schicht 57 an der Oberfläche des Materials 24 aus. Die Dicke dieser Schlämmeschicht 57 ist bei vorgegebener Feuchtigkeit des zugelieferten Einbaumaterials 24 angenähert konstant. Wie in Fig. 2 angedeutet, liegt die horizontale Unterseite der Druckplatte 26 annähernd in Höhe des Bodens der Schlämmeschicht 57 Bei der kontinuierlichen Vorwärtsbewegung des Gleitschalungsfertigers 16 in Richtung A gelangt ein gewisser Anteil der Schlämmeschicht 57 unter die abgerundete Vorderkante 26b der Druckplatte 26 und damit mit dem sonstigen Einbaumaterial 24 unter die Druckplatte 26. Dieser Anteil ist wesentlich für-einen glatten oberen Deckenabschluß. Bei zu niedrigem Schlämmeanteil ist das Einbaumaterial unterhalb der Druckplatte 26 zu trocken, so daß sich Löcher, Poren oder dergl. in der Fahrbahndecke ergeben. Bei zu hohem Schlämmeanteil bildet sich eine Deckschicht feinen Betons, die nicht die erforderliche Festigkeit aufweist und dazu neigt, beim Trocknen zu schrumpfen, was Unebenheiten und Risse zur Folge hat. Da, wie sich aus vorstehendem ergibt, die Dicke der Schlämmeschicht auf dem Einbaumaterial unterhalb der Druckplatte 26 vom Niveau c des vom Vorabstreifer 32 abgezogenen Einbaumaterials vor der Druckplatte 26 abhängt, kann man diese Dicke durch Änderung des Schlämmeniveaus vor der Druckplatte 26 nachregulieren. Der Nachregelung kann das Niveau h der Schlämmeoberfläche zugrunde-gelegt werden, da die Schlämmeschicht 57 vor der Druckplatte 26 bei gleichbleibender Betonkonsistenz im wesentlichen konstante Dicke d aufweist. Es ist ersichtlich, daß man das Niveau dadurch anheben kann, daß man den Vorabstreifer 32 anhebt. Zum Erniedrigen des Niveaus senkt man dementsprechend den Vorabstreifer 32 ab. Zur Feststellung des Niveau-Istwertes dient ein zylindrischer Schwimmkörper 56 mit horizontaler, quer zur Bewegungsrichtung A verlaufender Zylinderachse 56a, welcher in die Schlämmeschicht 57 im Bereich oberhalb der Flaschen 30 eintaucht. Der Schwimmkörper 56 ist über einen angenähert horizontal verlaufenden Verbindungslenker 58 an der Innenseite des Vorabstreifers 32 an diesem angelenkt (Gelenkbolzen 60). Am Verbindungslenker 58 ist wiederum eine angenähert vertikale Meßstange 62 angelenkt und zwar in einem Punkt (Bezugspunkt 64), der etwa auf halbem Wege des Abstands a Zylinderachse 56 und Gelenkbolzen 60 liegt. Das obere Ende der Meßstange 62 durchsetzt eine entsprechende Bohrung eines Schalterbetätigungselementes 66; eine im Bezug auf die Meßstangenachse radiale Feststellschraube 66a erlaubt eine Festlegung des Schalterbetätigungselements 66 in verschiedenen Höhenpositionen an der Meßstange 62.When the paving material is compacted using the vibrators 30, a particularly water-rich slurry or slurry layer 57 forms on the surface of the material 24. The thickness of this slurry layer 57 is approximately constant for a given moisture level of the supplied installation material 24. As indicated in FIG. 2, the horizontal underside of the pressure plate 26 lies approximately at the level of the bottom of the slurry layer 57. During the continuous forward movement of the slipform paver 16 in direction A, a certain proportion of the slurry layer 57 reaches below the rounded front edge 26b of the pressure plate 26 and thus with the other installation material 24 under the pressure plate 26. This portion is essential for a smooth upper ceiling. If the sludge content is too low, the paving material below the pressure plate 26 is too dry, so that there are holes, pores or the like in the road surface. If the proportion of slurry is too high, a covering layer of fine concrete forms which does not have the required strength and tends to shrink when drying, which leads to unevenness and cracks. Since, as can be seen from the above, the thickness of the slurry layer on the paving material below the pressure plate 26 depends on the level c of the paving material removed from the scraper 32 in front of the pressure plate 26, this thickness can be readjusted by changing the slurry level in front of the pressure plate 26. The readjustment can be based on the level h of the slurry surface, since the slurry layer 57 in front of the pressure plate 26 has an essentially constant thickness d with the concrete consistency remaining the same. It can be seen that the level can be raised by lifting the pre-stripper 32. Accordingly, the pre-stripper 32 is lowered to lower the level. A cylindrical float 56 with a horizontal cylinder axis 56a, which extends transversely to the direction of movement A, is used to determine the actual level, which is immersed in the slurry layer 57 in the region above the bottles 30. The floating body 56 is articulated on the inside of the preliminary scraper 32 by means of an approximately horizontally extending connecting link 58 (pivot pin 60). An approximately vertical measuring rod 62 is in turn articulated on the connecting link 58, specifically at a point (reference point 64) which lies approximately halfway between the distance a from the cylinder axis 56 and the pivot pin 60. The upper end of the measuring rod 62 passes through a corresponding bore of a switch actuating element 66; a locking screw 66a which is radial with respect to the measuring rod axis allows the switch actuating element to be fixed elements 66 in different height positions on the measuring rod 62.

Am Rahmen 16a des Gleitschalungsfertigers 16 ist im Bereich des oberen Meßstangenendes ein elektromechanischer Drei-Punkt-Schalter 68 befestigt, dessen Schalthebel 68a in einer Mittel- oder Neutralstellung horizontal verläuft und aus dieser Stellung in vertikaler Ebene nach oben in eine obere Endstellung und nach unten in eine untere Endstellung verschwenkbar ist (in Fig. 2 strichliert bzw. punktiert angedeutet). In Fig. 2 ist ein der Hebelbewegung folgender beweglicher Kontakt 68b angedeutet, welcher in der Mittelstellung des Hebels 68a frei liegt, in der oberen Endstellung des Hebels den festen Kontakt 70a berührt und in der unteren Endstellung des Hebels den festen Kontakt 70b. Ähnlich der Thermostatregelungen kann die Umschaltung aus der Mittelstellung in die obere'Kontaktstellung und zurück mit einer Schalthysterese versehen sein. Gleiches kann auch beim Übergang in die untere Schaltstellung und zurück vorgesehen sein.On the frame 16a of the slipform paver 16, an electromechanical three-point switch 68 is fastened in the area of the upper measuring rod end, the switch lever 68a of which runs horizontally in a central or neutral position and from this position in a vertical plane up to an upper end position and downwards in a lower end position is pivotable (dashed or dotted lines in FIG. 2). 2, a movable contact 68b following the lever movement is indicated, which is exposed in the central position of the lever 68a, touches the fixed contact 70a in the upper end position of the lever and the fixed contact 70b in the lower end position of the lever. Similar to the thermostat controls, the switchover from the middle position to the upper contact position and back can be provided with a switching hysteresis. The same can also be provided for the transition to the lower switching position and back.

Die beiden festen Kontakte 70a und 70b sind über entsprechende strichpunktiert angedeutete elektrische Leitungen 72a und 72b mit einer Regelschaltung 74 verbunden. Die Schaltung 74 steuert ein Vier/Drei-Wegeventil 76 über eine Steuerleitung 78. Die beiden oberen Anschlüsse des Ventils 76 sind zum einen an eine Hydraulikleitung 80a angeschlossen, welche zum Druckanschluß einer Hydraulikpumpe 82 führt und zum anderen an eine Rückführleitung 80b, welche in einem Hydrauliköl-Vorratsbehälter 84 mündet. Die Pumpe 82 wird über eine Leitung 80c mit Druckfluid aus dem Vorratsbehälter 84 versorgt. Die beiden in Fig. 2 unteren Anschlüsse des Ventils 76 sind über Hydraulikleitungen 80d und 80e mit den beiden Anschlüssen 50a und 50b des doppelt wirkenden Zylinders 50 verbunden. Ein an der Kolbenstange 52a im Zylinderinnenraum vorgesehener Arbeitskolben 52b teilt den Zylinderinnenraum in zwei Arbeitsräume, wobei der die Kolbenstange 52aplanar umgebende Arbeitsraum mit dem Anschluß 50b und der andere mit dem Anschluß 50a verbunden ist.The two fixed contacts 70a and 70b are connected to a control circuit 74 via corresponding electrical lines 72a and 72b, indicated by dash-dotted lines. The circuit 74 controls a four / three-way valve 76 via a control line 78. The two upper connections of the valve 76 are connected on the one hand to a hydraulic line 80a, which leads to the pressure connection of a hydraulic pump 82, and on the other hand to a return line 80b, which is in one Hydraulic oil reservoir 84 opens. The pump 82 is supplied with pressure fluid from the reservoir 84 via a line 80c. The two lower connections of the valve 76 in FIG. 2 are connected to the two connections 50a and 50b of the double-acting cylinder 50 via hydraulic lines 80d and 80e. One at the Piston rod 52a provided in the cylinder interior working piston 52b divides the cylinder interior into two working spaces, the working space surrounding the piston rod 52a planar is connected to the connection 50b and the other to the connection 50a.

In der in Fig. 2 dargestellten Mittelstellung des Ventils 76 ist die Leitung 80a mit der Leitung 80b verbunden; die Leitungen 80d und 80e dagegen werden durch das Ventil 76 abgesperrt. Der Kolben 52b kann sich demnach innerhalb des Zylinders 50 nicht in axialer Richtung bewegen, so daß dementsprechend der Vorabstreifer 32 über die blockierte Kolbenstange 52a und den Doppelarmhebel gegenüber der Druckplatte 26 unbeweglich ist. Steigt nun aus irgendwelchen Gründen das Niveau des Einbaumaterials 24 einschließlich Schlämmeschicht 57 relativ zur Druckplatte 26, so wird der Schwimmkörper 56 angehoben und mit diesem die Meßstange 62, jedoch um die Hälfte des Weges. Da das freie Ende des Schalthebels 68a des Schalters 68 am Schalterbetätigungselement 66 angelenkt ist, verschwenkt der Schalthebel 68a entsprechend der Meßstangenbewegung. Sobald die obere Endstellung des Hebels 68a erreicht wird, schaltet der Schalter 68 um, was zu einem Schließen der Kontakte 68b und 70a führt. Ein dementsprechendes Signal wird der Regelschaltung 74 über die Leitung 72a zugeführt, die daraufhin die aus der Pumpe S2 und dem Ventil 76 gebildete Hydraulikeinrichtung derart steuert, daß der Vorabstreifer 32 gesenkt wird. Hierzu wird der Ventilkörper des Ventils 76 in Fig. 2 nach links in die entsprechende Schaltstellung verschoben, in der die Leitung 80a mit der Leitung 80d und die Leitung 80b mit der Leitung 80e verbunden sind. Falls die Pumpe 82 nicht ständig läuft, wird diese über eine Leitung 74a von der Schaltung 74 angeworfen, woraufhin der entsprechende Hydraulikdruck ein Ausfahren der Kolbenstange 52a veranlaßt und damit ein Senken des Vorabstreifers 32. Da sich das Niveau h erst mit relativ großer Zeitverzögerung nach dem Beginn des Absenkens des Vorabstreifers 32 entsprechend ändert, bildet die Zylinderachse 56a bezüglich des Verbindungslenkers 58 eine momentan räumlich konstante Schwenkachse beim Absenken d.es Vorabstreifers 32. Demzufolge senkt sich die Meßstange 62 um die Hälfte des vom Vorabstreifers 32 vertikal nach unten zurückgelegten Weges nach unten bis schließlich der Schalter 68 wieder in seine neutrale Mittelstellung umschaltet. Daraufhin schaltet die Regelschaltung 74 das Ventil 76 wieder in die in Fig. 2 dargestellte Mittelstellung, in der der Vorabstreifer 32 relativ zur Druckplatte 26 stillsteht.In the central position of valve 76 shown in FIG. 2, line 80a is connected to line 80b; the lines 80d and 80e, on the other hand, are shut off by the valve 76. The piston 52b can therefore not move in the axial direction within the cylinder 50, so that accordingly the preliminary scraper 32 is immovable relative to the pressure plate 26 via the blocked piston rod 52a and the double arm lever. If for some reason the level of the paving material 24 including the slurry layer 57 rises relative to the pressure plate 26, the float 56 is raised and with it the measuring rod 62, but by half the way. Since the free end of the switching lever 68a of the switch 68 is articulated on the switch actuating element 66, the switching lever 68a pivots in accordance with the movement of the measuring rod. As soon as the upper end position of the lever 68a is reached, the switch 68 switches over, which results in the contacts 68b and 70a closing. A corresponding signal is fed to the control circuit 74 via the line 72a, which then controls the hydraulic device formed from the pump S2 and the valve 76 in such a way that the pre-stripper 32 is lowered. For this purpose, the valve body of valve 76 in FIG. 2 is shifted to the left into the corresponding switching position, in which line 80a is connected to line 80d and line 80b is connected to line 80e. If the pump 82 does not run continuously, it is started by the circuit 74 via a line 74a, whereupon the corresponding hydraulic pressure causes the piston rod 52a to extend and thus to turn on Lowering the preliminary scraper 32. Since the level h changes accordingly only with a relatively large time delay after the beginning of the lowering of the preliminary scraper 32, the cylinder axis 56a forms a momentarily spatially constant pivot axis with respect to the connecting link 58 when the preliminary scraper 32 is lowered. As a result, it lowers the measuring rod 62 down by half the distance covered vertically downwards by the scraper 32 until finally the switch 68 switches back to its neutral central position. The control circuit 74 then switches the valve 76 back into the central position shown in FIG. 2, in which the preliminary scraper 32 is stationary relative to the pressure plate 26.

Bei zu niedrigem Niveau h und entsprechender Umschaltung des Schalters 68 in dessen untere Endstellung schaltet die Regelschaltung 74 das Ventil 76 in die dritte Schaltstellung, in der die Leitungen 80a und 80e sowie die Leitungen 80b und 80d miteinander verbunden sind. Bei laufender Pumpe 82 wird demzufolge die Kolbenstange 52a in den Zylinder 50 eingeschoben und dementsprechend der Vorabstreifer angehoben bis schließlich über die sich mitbewegende Schaltstange 62 der Schalter 68 in seine Mittelstellung umgeschaltet wird.If the level h is too low and the switch 68 is correspondingly switched over to its lower end position, the control circuit 74 switches the valve 76 into the third switching position in which the lines 80a and 80e and the lines 80b and 80d are connected to one another. When the pump 82 is running, the piston rod 52a is consequently pushed into the cylinder 50 and the preliminary scraper is raised accordingly until the switch 68 is finally switched to its central position via the moving switching rod 62.

Falls es sich ergibt, daß das gewählte Soll-Niveau nicht dem optimalen Niveau entspricht, kann man das Soll-Niveau in einfacher Weise dadurch ändern, daß man die Feststell- schraube 66a lockert, das Schalterbetätigungselement 66 entsprechend verschiebt und mit der Feststellhaube 66a erneut an der Meßstange 62 festlegt. Zur Erhöhung des Soll-Niveaus muß man das Schalterbetätigungselement 66 an einen vergleichsweise tieferen Punkt der Meßstange 62 an dieser befestigen; zur Erniedrigung des Soll-Niveaus muß das Schalterbetätigungselement 66 nach oben verschoben werden.If it is found that the selected target level does not correspond to the optimum level, possible to change the target level in a simple manner by reacting the F eststell- screw 66a loosens, shifts the switch operating element 66 accordingly, and again with the locking hood 66a sets on the measuring rod 62. To increase the target level, the switch actuating element 66 must be attached to the measuring rod 62 at a comparatively lower point on the latter; for lowering the target level of the S must chalterbetätigungselement 66 are shifted upward.

Mit Hilfe der vorstehend beschriebenen selbsttätigen Re-geleinrichtung für die Vorabstreiferhöheh läßt sich unter geringem mechanischen Aufwand zuverlässig die Sollhöhe h in einem Bereich von 11 ± 2 cm halten, bei einerWith the help of the automatic R above-described e-gel means for reliably Vorabstreiferhöheh the target height h can be in a range of 11 ± 2 cm kept under little mechanical effort, at a

Dicke der Oberschicht 12b von 6 bis 7 cm. Die Dicke der Unter schicht 12 a beträgt hierbei etwa 15 cm. Wie aus vorstehendem hervorgeht, wird der Höhenregelung die Höhe h' des Bezugspunktes 64 als Istwert zugrunde-gelegt. Dementsprechend ergibt sich als Sollwert die Summe aus dem Schlämmeniveau-Sollwert und dem Abstand b der den Auftriebsmittelpunkt des Schwimmkörpers 56 bildenden Zylinderachse 56 von der Schlämmeoberfläche. Die Höhe h setzt sich ihrerseits zusammen aus der Dicke c der eigentlichen Betonschicht und der Dicke d der flüssigen Schlämmeschicht 57.Top layer 12b thickness from 6 to 7 cm. The thickness of the lower layer 12 a is about 15 cm. As can be seen from the foregoing, the height control is based on the height h 'of the reference point 64 as the actual value. Accordingly, the sum of the sludge level setpoint and the distance b of the cylinder axis 56 forming the center of buoyancy of the floating body 56 from the sludge surface results as the desired value. The height h in turn is composed of the thickness c of the actual concrete layer and the thickness d of the liquid slurry layer 57 .

Bei größeren Fahrbahnbreiten besteht erfindungsgemäß die Möglichkeit, den Vorabstreifer in horizontaler Richtung in mehrere Vorabstreiferteile zu unterteilen, die jeweils gesondert mittels einer Regelvorrichtung gemäß Fig. 2 in ihrer Höhe selbsttätig regelbar sind.In the case of larger roadway widths, according to the invention there is the possibility of dividing the preliminary scraper in the horizontal direction into a plurality of preliminary scraper parts, each of which can be automatically adjusted in height separately by means of a control device according to FIG. 2.

Claims (14)

1. Vorrichtung zur selbsttätigen Regelung der Vorabstreiferhöhe eines Gleitschalungsfertigers, welcher einen Vorabstreifer, eine von diesem beabstandete, eine obere Gleitschalung bildende Druckplatte und ggf. eine Rütteleinrichtung im Zwischenbereich aufweist, gekennzeichnet durch
einen Niveausensor (56, 58, 62) im Bereich zwischen Vorabstreifer (32) und Druckplatte (26) für das Einbaumaterial (24),
einen Höhenverstellantrieb (49, 50, 82) für den Vorabstreifer (32) und
eine Regeleinrichtung (68, 74, 76), welche ein ermitteltes Ist-Niveau des Einbaumaterials (24) mit einem Soll-Niveau vergleicht und, in Richtung einer Verringerung der Niveaudifferenz,den Höhenverstellantrieb steuert.1. Device for automatic control of the pre-wiper height of a slipform paver, which has a pre-wiper, a spaced from it, an upper sliding formwork pressure plate and possibly a vibrating device in the intermediate area, characterized by
a level sensor (56, 58, 62) in the area between the preliminary scraper (32) and the pressure plate (26) for the installation material (24),
a height adjustment drive (49, 50, 82) for the scraper (32) and
a control device (68, 74, 76) which compares a determined actual level of the paving material (24) with a target level and controls the height adjustment drive in the direction of a reduction in the level difference. 2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß eine Drei-Punkt-Regelung vorgesehen ist.2. Device according to claim 1, characterized in that a three-point control is provided. 3. Vorrichtung nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß eine Folgeregelung mit von Hand eingebbaren, unterschiedlichen Soll-Niveauwerten vorgesehen ist.3. Apparatus according to claim 1 or 2, characterized in that a follow-up control is provided with different target level values which can be entered manually. 4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Niveausensor ein Schwimmkörperelement (56, 58) umfaßt.4. Device according to one of claims 1 to 3, characterized in that the level sensor comprises a floating body element (56, 58). 5. Vorrichtung nach Anspruch 4, dadurch gekennzeichnet, daß das Schwimmkörperelement (56, 58) am Vorabstreifer (32) angelenkt ist und daß als Ist-Niveau die Höhe h' eines Bezugspunktes (641 des Schwimmkörperelements zwischen dem Anlenkpunkt (60) und dem Auftriebsmittelpunkt (56a) festgelegt wird, welcher vorzugsweise einen Abstand vom Anlenkpunkt zwischen 1/4 und 3/4, besser 1/3 bis 2/3, am besten etwa der Hälfte des Abstandes Anlenkpunkt-Auftriebsmittelpunkt aufweist.5. The device according to claim 4, characterized in that the floating body element (56, 58) is articulated on the scraper (32) and that as the actual level, the height h 'of a reference point (641 of the floating body element between the pivot point (60) and the center of buoyancy (56a) is determined, which preferably has a distance from the articulation point between 1/4 and 3/4, better 1/3 to 2/3, ideally about half of the articulation point-buoyancy center distance. 6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß das Schwimmkörperelement aus einem vorzugsweise sphärischen oder zylindrischen Schwimmkörper (56) und einem an einem Ende den Schwimmkörper tragenden und am anderen Ende am Vorabstreifer (32) angelenkten Verbindungslenker (58) besteht.6. The device according to claim 5, characterized in that the floating body element consists of a preferably spherical or cylindrical floating body (56) and at one end carrying the floating body and at the other end to the scraper (32) articulated connecting link (58). 7. Vorrichtung nach Anspruch 5 oder 6, gekennzeichnet durch eine im Bezugspunkt mit dem Schwimmkörperelement, ggf. dem Verbindungslenker (58), verbundene, vorzugsweise dort angelenkte Meßstange (62).7. The device according to claim 5 or 6, characterized by a in the reference point with the float element, possibly the connecting link (58) connected, preferably articulated there measuring rod (62). 8. Vorrichtung nach Anspruch 7, gekennzeichnet durch einen mit der Meßstange (62) verkoppelten Drei-Punkt-Schalter (68) .8. The device according to claim 7, characterized by a with the measuring rod (62) coupled three-point switch (68). 9. Vorrichtung nach Anspruch 8, gekennzeichnet durch ein an der Meßstange (62) in verschiedenen Positionen längs der Meßstange wahlweise anbringbares Schalterbetätigungselement (66) für den Drei-Punkt-Schalter (68).9. The device according to claim 8, characterized by an the measuring rod (62) in various positions along the measuring rod selectively attachable switch actuator (66) for the three-point switch (68). 10. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, daß das Schalterbetätigungselement (66) mit einem Schalthebel (68a) des Drei-Punkt-Schalters (68) gelenkig verbunden ist.10. The device according to claim 9, characterized in that the switch actuating element (66) with a switching lever (68 a) of the three-point switch (68) is articulated. 11. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, daß das Schalterbetätigungselement (66) die Meßstange (62) umgreift und mittels einer Feststellschraube (66a) an der Meßstange festlegbar ist.11. The device according to claim 10, characterized in that the switch actuating element (66) engages around the measuring rod (62) and can be fixed on the measuring rod by means of a locking screw (66a). 12. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Höhenverstellantrieb wenigstens einen, vorzugsweise doppelt wirkenden Hydraulikzylinder (50), umfaßt, welcher vorzugsweise über einen an der Druckplatte (26) angelenkten Doppelarmhebel (49) an den Vorabstreifer (32) angreift.12. Device according to one of the preceding claims, characterized in that the height adjustment drive comprises at least one, preferably double-acting hydraulic cylinder (50), which preferably engages the pre-wiper (32) via a double-arm lever (49) articulated on the pressure plate (26) . 13. Vorrichtung nach Anspruch 12, dadurch gekennzeichnet, daß eine elektrische Regelschaltung (74) vorgesehen ist, welche mit dem elektromechanischen Drei-Punkt-Schalter (68) verbunden ist und eine mit dem wenigstens einen Hydraulikzylinder verbundene Hydraulikeinrichtung (76, 82) steuert.13. The apparatus according to claim 12, characterized in that an electrical control circuit (74) is provided which is connected to the electromechanical three-point switch (68) and controls a hydraulic device (76, 82) connected to the at least one hydraulic cylinder. 14. Gleitschalungsfertiger mit einem Vorabstreifer, einem von diesem beabstandeten, eine obere Gleitschalung bildenden Druckplatte und ggf. einer Rütteleinrichtung im Zwischenbereich, dadurch gekennzeichnet, daß der Vorabstreifer in wenigstens zwei Vorabstreiferteile unterteilt ist, welche jeweils für sich mittels einer Vorrichtung nach einem der Ansprüche 1 bis 13 höhenregelbar sind.14. slipform paver with a scraper, a spaced therefrom, an upper sliding formwork pressure plate and possibly a vibrating device in the intermediate area, characterized in that the scraper is divided into at least two scraper parts, each for itself by means of a device according to one of claims 1 are adjustable in height up to 13.
EP83108353A 1982-08-27 1983-08-24 Device for automatically controlling the height of the preliminary strike-off of a conforming plate finisher Expired EP0102060B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3232020 1982-08-27
DE19823232020 DE3232020A1 (en) 1982-08-27 1982-08-27 DEVICE FOR THE AUTOMATIC CONTROL OF THE PRE-SCRAPER HEIGHT OF A SLIDING PAVER

Publications (3)

Publication Number Publication Date
EP0102060A2 true EP0102060A2 (en) 1984-03-07
EP0102060A3 EP0102060A3 (en) 1985-05-02
EP0102060B1 EP0102060B1 (en) 1986-11-26

Family

ID=6171913

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83108353A Expired EP0102060B1 (en) 1982-08-27 1983-08-24 Device for automatically controlling the height of the preliminary strike-off of a conforming plate finisher

Country Status (2)

Country Link
EP (1) EP0102060B1 (en)
DE (2) DE3232020A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0186780A1 (en) * 1984-12-27 1986-07-09 Dynapac Aktiebolag Device for spreading bituminous binder
EP0376692A2 (en) * 1988-12-29 1990-07-04 David W. Somero Improved screeding apparatus and method
US6129481A (en) * 1998-03-31 2000-10-10 Delaware Capital Formation, Inc. Screed assembly and oscillating member kit therefor
US6227761B1 (en) 1998-10-27 2001-05-08 Delaware Capital Formation, Inc. Apparatus and method for three-dimensional contouring
US7311466B2 (en) 2004-07-06 2007-12-25 Somero Enterprises, Inc. Apparatus and method for subgrade preparation
US7399139B2 (en) 1998-10-27 2008-07-15 Somero Enterprises, Inc. Apparatus and method for three-dimensional contouring
GR1010235B (en) * 2021-06-16 2022-05-19 Χρηστος Γεωργιου Τζεκας Do--it-yourself configuration and lining of trenches with concrete

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3810891A1 (en) * 1988-03-30 1989-10-19 Heilit & Woerner Bau Ag SUBSTRATE PAVER
CN110158423B (en) * 2019-06-10 2021-08-06 陕西专壹知识产权运营有限公司 Cement pavement template mounting machine

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2396426A (en) * 1941-07-05 1946-03-12 Jackson Corwill Machine or apparatus for placing concrete pavements and the like
US3354801A (en) * 1965-06-17 1967-11-28 Raymond A Hanson Highway slipform
DE3032495A1 (en) * 1980-08-28 1982-04-01 Heilit + Woerner Bau-AG, 8000 München Tracked sliding form machine building concrete road deck - travels on levelled auxiliary path set up at road side

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2396426A (en) * 1941-07-05 1946-03-12 Jackson Corwill Machine or apparatus for placing concrete pavements and the like
US3354801A (en) * 1965-06-17 1967-11-28 Raymond A Hanson Highway slipform
DE3032495A1 (en) * 1980-08-28 1982-04-01 Heilit + Woerner Bau-AG, 8000 München Tracked sliding form machine building concrete road deck - travels on levelled auxiliary path set up at road side

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0186780A1 (en) * 1984-12-27 1986-07-09 Dynapac Aktiebolag Device for spreading bituminous binder
EP0376692A2 (en) * 1988-12-29 1990-07-04 David W. Somero Improved screeding apparatus and method
EP0376692A3 (en) * 1988-12-29 1991-07-17 David W. Somero Improved screeding apparatus and method
US6129481A (en) * 1998-03-31 2000-10-10 Delaware Capital Formation, Inc. Screed assembly and oscillating member kit therefor
US6152647A (en) * 1998-03-31 2000-11-28 Delaware Capital Formation, Inc. Screeding method incorporating oscillating member
US6183160B1 (en) 1998-03-31 2001-02-06 Delaware Capital Formation, Inc. Screeding apparatus and method incorporating oscillating attachment
US6227761B1 (en) 1998-10-27 2001-05-08 Delaware Capital Formation, Inc. Apparatus and method for three-dimensional contouring
US6929420B2 (en) 1998-10-27 2005-08-16 Delaware Capital Formation, Inc. Apparatus and method for three-dimensional contouring
US7144191B2 (en) 1998-10-27 2006-12-05 Somero Enterprises, Inc. Apparatus and method for three-dimensional contouring
USRE39834E1 (en) 1998-10-27 2007-09-11 Michigan Technological University Apparatus and method for three-dimensional contouring
US7399139B2 (en) 1998-10-27 2008-07-15 Somero Enterprises, Inc. Apparatus and method for three-dimensional contouring
US7311466B2 (en) 2004-07-06 2007-12-25 Somero Enterprises, Inc. Apparatus and method for subgrade preparation
GR1010235B (en) * 2021-06-16 2022-05-19 Χρηστος Γεωργιου Τζεκας Do--it-yourself configuration and lining of trenches with concrete

Also Published As

Publication number Publication date
DE3367944D1 (en) 1987-01-15
EP0102060B1 (en) 1986-11-26
DE3232020A1 (en) 1984-03-01
EP0102060A3 (en) 1985-05-02

Similar Documents

Publication Publication Date Title
EP0750070B1 (en) A Road Finisher and a Method of Applying Surface Layers
EP3375936B1 (en) Paving screed for paver
DE2009427C3 (en) Trackless paver for widening existing road surfaces
DE19836269C1 (en) Road building machine with undercarriage
EP2366832B1 (en) Method and paver for producing a compacted paved surface
EP0217408B1 (en) Method and device for the height adjustment of a screed
DE112016000713B4 (en) Auto-calibration of an automatic leveling control system in a work machine
EP0379148A2 (en) Method of and device for constructing a ballastless superstructure
EP1310598B1 (en) Paver for laying roadlayers
EP3498914A1 (en) Adjustment of the levelling cylinder in a road finisher
EP0102060B1 (en) Device for automatically controlling the height of the preliminary strike-off of a conforming plate finisher
WO2018033516A1 (en) Slope finisher
EP0757735B1 (en) Vehicle for use in repairing road surfaces
DE2330548A1 (en) DEVICE THAT LAYS A TAPE OF A MOLDABLE PLASTIC MIXTURE DURING ITS FORWARD MOVEMENT
EP1179636B1 (en) Road paver and method of paving
EP2325393A1 (en) Method and paver for manufacturing a street covering
DE4040029C1 (en)
DE2147691A1 (en) DEVICE FOR COMPACTION IN THE FINAL TREATMENT OF ROAD COVERS MADE OF HOT MIXED MATERIAL
DE3032495C2 (en)
EP0495171B1 (en) Laying-down course thickness adjusting method with a finisher
EP1582629A1 (en) Paver and method for simultaneously applying multiple layers of material
EP0335339B1 (en) Basecourse finisher
DE102017202461A1 (en) STAMPING SYSTEMS WITH STAGE-ADJUSTABLE AMPLITUDE AND FREQUENCY
DE102005019139B4 (en) Screed with upstream compaction unit
DE3036234A1 (en) DEVICE FOR LEVELING A CONCRETE COVER SURFACE AND METHOD FOR THEIR OPERATION

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): BE DE FR

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Designated state(s): BE DE FR

17P Request for examination filed

Effective date: 19850520

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): BE DE FR

REF Corresponds to:

Ref document number: 3367944

Country of ref document: DE

Date of ref document: 19870115

ET Fr: translation filed
PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed
BECA Be: change of holder's address

Free format text: 20010919 WALTER *HEILIT VERKEHRSWEGEBAU G.M.B.H.:KLAUSENBURGER STRASSE 9, 81677 MUENCHEN

BECH Be: change of holder

Free format text: 20010919 WALTER *HEILIT VERKEHRSWEGEBAU G.M.B.H.

BECN Be: change of holder's name

Effective date: 20010919

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20020515

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20020614

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20020821

Year of fee payment: 20

REG Reference to a national code

Ref country code: FR

Ref legal event code: TP

Ref country code: FR

Ref legal event code: CJ

Ref country code: FR

Ref legal event code: CD

REG Reference to a national code

Ref country code: FR

Ref legal event code: RM