WO2006075863A1

WO2006075863A1 - Long-span temporary bridge using cross beam having through-holes

Info

Publication number: WO2006075863A1
Application number: PCT/KR2006/000103
Authority: WO
Inventors: Sung Kim
Original assignee: Leton Bridge Co., Ltd.
Priority date: 2005-01-11
Filing date: 2006-01-10
Publication date: 2006-07-20
Also published as: KR100572860B1; KR20050012863A

Abstract

Provided is a long-span temporary bridge having a plurality of bridge posts, a plurality of main beams installed on the bridge posts, a plurality of deck plates installed on the main beams, cross beams having through-holes and tension members are connected through the through-holes such that a long span can be realized using the plurality of tension members.

Description

LONG-SPAN TEMPORARY BRIDGE USING CROSS BEAM

HAVING THROUGH-HOLES

Technical Field

[1] The present invention relates to a temporary bridge, and more particularly, to a long-span temporary bridge using cross beams having through-holes, in which tension members are connected between cross beams having a plurality of through-holes to apply prestress and to reduce positive moment such that a span can widen. Background Art

[2] A temporary bridge is installed and used for various purposes such as ensuring of a detour upon road repairing, detour crossing of vehicles upon bridge repairing, building of a pedestrian bridge on a busy road, or building of a work bridge in port facilities.

[3] Since a conventional temporary bridge uses an I-beam and a deck plate and has a short span and a complicated shape, a construction cost and a construction period excessively increase and thus construction performance significantly deteriorates. In addition, in the rainy season, a float material may be caught on a short-span temporary bridge so that the river overflows or the bridge may upset due to a lateral load having a high flow rate. Accordingly, there is a need for installing a long-span temporary bridge.

Disclosure of Invention Technical Problem

[4] Up to Now, several constructing methods for realizing a long span have been suggested. Among them, a constructing method of attaching vertical and horizontal reinforcement members to an H-beam and attaching a deviator to the center of the lower surface of the H-beam, installing a fixing member on the both ends of the deviator, and applying prestress using a high-strength steel rod is widely being used.

[5] By structural computation, the above-mentioned constructing method can increase the span up to about 30 meters. However, since this span includes the widths of the bridge posts, the span is actually about 28 meters. If the span is greater than 28 meters, the temporary bridge is structurally dangerous.

[6] In addition, in this constructing method, since the high-strength steel rod is installed on the lower surface of the H-beam, a force is concentrated on a main beam.

[7] Recently, as the temporary bridge is used for various purposes such as a detour bridge, a construction bridge, or a permanent bridge, the length and the width of the temporary bridge become longer and the use period of the temporary bridge becomes longer. Accordingly, a method of constructing a structurally stable temporary bridge while addressing the problems of the conventional long-span temporary bridge and ensuring the longer span is increasingly required.

Technical Solution

[8] The present invention is contrived to solve the above-mentioned problems, and an object of the present invention is to provide a long-span temporary bridge using cross beams having through-holes, in which cross beams having a plurality of through-holes are installed and tension members are connected through the through-holes such that a long span can be realized using the plurality of tension members.

[9] Another object of the present invention is to provide a long-span temporary bridge using cross beams having through-holes, in which tension members are installed at positions corresponding to the main beams as well as portions between main beams such that a force is distributed to prevent the force from being concentrated on the main beams.

[10] According to an aspect of the present invention, there is provided a long-span temporary bridge having a plurality of bridge posts, a plurality of main beams installed on the bridge posts, and a plurality of deck plates installed on the main beams, including: a first cross beam which is installed on the lower surfaces of the plurality of main beams between the bridge posts to cross the plurality of main beams and has a plurality of through-holes formed therein; a second cross beam which is installed on the lower surfaces of the plurality of main beams to cross the plurality of main beams and to be spaced apart from the first cross beam and has a plurality of through-holes formed therein; a plurality of tension members which is connected between the first cross beam and the second cross beam and of which the both ends pass through the through-holes formed in the first cross beam and the second cross beam and are protruded from the first cross beam and the second cross beam; and a plurality of fixing members which is installed at one sides of the first cross beam and the second cross beam to fix the both ends of the tension members.

[11] The long-span temporary bridge may further include a third cross beam which is installed on the lower surfaces of the main beams at an intermediate portion between the first cross beam and the second cross beam to cross the plurality of main beams, and saddles which are installed on the lower surface of the third cross beam and in which the tensions member are positioned.

[12] The number of the through-holes formed in the first cross beam and the second cross beam at positions between the main beams may be at least one.

[13] The through-holes may be formed in the first and second cross beams at position corresponding to the main beams.

[14] The long-span temporary bridge may further include a reinforcement frame attached to one sides of the first cross beam and the second cross beam and the lower surfaces of the main beams.

[15] The both ends of the main beams may be seated on connection slabs.

Advantageous Effects

[16] According to the present invention, it is posssible to provide a long-span temporary bridge using cross beams having through-holes, in which cross beams having a plurality of through-holes are installed and tension members are connected through the through-holes such that a long span can be realized using the plurality of tension members.

[17] In addition, it is possible to provide a long-span temporary bridge using cross beams having through-holes, in which tension members are installed at positions corresponding to the main beams as well as portions between main beams such that a force is distributed to prevent the force from being concentrated on the main beams. Brief Description of the Drawings

[18] The above and other features and advantages of the present invention will become more apparent by describing in detail exemplary embodiments thereof with reference to the attached drawings in which:

[19] FlG. 1 is a front view of a long-span temporary bridge using cross beams having through-holes according to the present invention;

[20] FlG. 2 is a lateral cross-sectional view taken along line A-A of FlG. 1 according to a first embodiment of the present invention;

[21] FlG. 3 is a lateral cross-sectional view taken along line B-B of FlG. 1 according to the first embodiment of the present invention;

[22] FlG. 4 is a plan view of the long-span temporary bridge illustrated in FlG. 1 according to the first embodiment of the present invention;

[23] FlG. 5 is a lateral cross-sectional view taken along line A-A of FlG. 1 according to a second embodiment of the present invention;

[24] FlG. 6 is a lateral cross-sectional view taken along line B-B of FlG. 1 according to the second embodiment of the present invention;

[25] FlG. 7 is a plan view of the long-span temporary bridge illustrated in FlG. 1 according to the second embodiment of the present invention;

[26] FlG. 8 is a partially enlarged front view illustrating the structure of a fixing member;

[27] FlG. 9 is a partially enlarged lateral cross-sectional view illustrating the structure of the fixing member; and

[28] FlG. 10 is a partial enlarged front view illustrating a structure in which a reinforcement frame is attached to one side of the cross beam and the lower surface of a main beam.

[29] <Reference Numerals>

[30] 1 : Bridge post 2: Main beam

[31] 3: Deck plate 4: Cross beam

[32] 5: Saddle 6: Fixing member

[33] 7: Tension member 8: Connection slab

[34] 9: Reinforcement frame 10: Reinforcement plate

Best Mode for Carrying Out the Invention [35] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the attached drawings such that the present invention can be easily put into practice by those skilled in the art. [36] FIG. 1 is a front view of a long-span temporary bridge using cross beam having through-holes according to the present invention. [37] A cable-stayed girder bridge type long-span bridge according to the present invention includes bridge posts 1, main beams 2, deck plates 3, first through third cross beams 4-1 through 4-3, saddles 5, fixing members 6, and connection slabs 8. [38] Each bridge post 1 is a steel material in which a plurality of H-beams is installed and is installed on the surface of land. The main beams 2 are installed on the bridge posts 1. In addition, a plurality of deck plates 3 made of a steel material is installed on the main beams 2. [39] The first cross beam 4-1 is installed on the lower surfaces of the plurality of main beams 2 between the bridge posts 1 to cross the plurality of main beams 2.

Furthermore, a plurality of through-holes (not shown) is formed in the first cross beam

4-1. [40] The first cross beam 4-2 is installed on the lower surfaces of the plurality of main beams 2 to cross the plurality of main beams 2 and to be spaced apart from the first cross beam 4-1 at a predetermined distance. Furthermore, a plurality of through-holes

(not shown) is formed in the first cross beam 4-2. [41] The fixing members 6 for fixing tension members 7 are installed at the outsides of the first cross beam 4-1 and the second cross beam 4-2. [42] The third cross beam 4-3 is installed on the lower surfaces of the main beams 2 at an intermediate portion between the first cross beam 4-1 and the second cross beam

4-2 to cross the plurality of main beams 2. The saddles 5 are installed on the lower surface of the third cross beam 4-3. [43] The first through third cross beams 4-1 through 4-3 are installed on the lower surfaces of the plurality of main beams 2 to prevent the temporary bridge from sagging. Furthermore, by inserting the plurality of tension members 7, it is possible to reduce positive moment applied to the span of the temporary bridge.

[44] The tension members 7 are connected between the first cross beam 4-1 and the second cross beam 4-2 across the saddles 5 installed on the lower surface of the third cross beam 4-3 and are fixed by the fixing members 6. As the tension member 7, a high-strength steel rod or a high-strength steel wire is mainly used. By attaching the saddles 5 to the lower surface of the third cross beam 4-3, the tension members 7 are sloped downward from the first and second cross beams 4-1 and 4-2 to the third cross beam 4-3. Thus, an upward load is applied to the saddles 5 and the third cross beam 4-3 such that a sagging phenomenon can be efficiently removed.

[45] The both ends of the main beams 2 are seated on L-shaped connection slabs 8, and thus the temporary bridge is evenly connected to the road of land and becomes more stable.

[46] FlG. 2 is a lateral cross-sectional view taken along line A-A of FlG. 1 according to a first embodiment of the present invention, FlG. 3 is a lateral cross-sectional view taken along line B-B of FlG. 1 according to the first embodiment of the present invention, and FlG. 4 is a plan view of the long-span temporary bridge illustrated in FlG. 1 according to the first embodiment of the present invention.

[47] As shown in FIGS. 2 through 4, in the first embodiment, the tension members 7 are connected between the first cross beam 4-1 and the second cross beam 4-2 at positions between the main beams 2.

[48] Referring to FIGS. 2 through 4, the through-holes are formed in the first cross beam

4-1 and the second cross beam 4-2 at positions between the main beams 2, and the tension members 7 pass through the through-holes formed in the first cross beam 4-1 and the second cross beam 4-2 and are fixed by the fixing members 6 installed at the outsides of the cross beams 4-1 and 4-2.

[49] The saddles 5 are attached to the lower surface of the third cross beam 4-3 at positions corresponding to the through-holes of the first cross beam 4-1 and the second cross beam 4-2.

[50] Although, in the first embodiment, one through-hole is formed at the position between the main beams 2, the present invention is not limited to this embodiment. At least two through-holes may be formed at the positions between the main beams 2 and a plurality of tension members may be installed in correspondence with the through- holes. Thus, it is possible to realize a long span of 30 m by applying more prestress and to uniformly distribute a force. Mode for the Invention

[51] FlG. 5 is a lateral cross-sectional view taken along line A-A of FlG. 1 according to a second embodiment of the present invention, FlG. 6 is a lateral cross-sectional view taken along line B-B of FlG. 1 according to the second embodiment of the present invention, and FlG. 7 is a plan view of the long-span temporary bridge illustrated in FlG. 1 according to the second embodiment of the present invention.

[52] As shown in FIGS. 5 through 7, in the second embodiment, the tension members 7 are connected between the first cross beam 4-1 and the second cross beam 4-2 at positions between the main beams 2 and positions corresponding to the main beams 2.

[53] Referring to FIGS. 5 through 7, the through-holes are formed in the first cross beam

4-1 and the second cross beam 4-2 at positions between the main beams 2 and positions corresponding to the main beams 2, and the tension members 7 pass through the through-holes formed in the first cross beam 4-1 and the second cross beam 4-2 and are fixed by the fixing members 6 installed at the outsides of the cross beams 4-1 and 4-2.

[54] The saddles 5 are attached to the lower surface of the third cross beam 4-3 at positions corresponding to the through-holes of the first cross beam 4-1 and the second cross beam 4-2.

[55] Although, in the second embodiment, one through-hole is formed at the position between the main beams 2, the present invention is not limited to this embodiment. At least two through-holes may be formed at the position between the main beams 2 and a plurality of tension members may be installed in correspondence with the through- holes. In the second embodiment, since more tension members can be installed, it is possible to realize a long span and to uniformly distribute a force by applying more prestress.

[56] FlG. 8 is a partially enlarged front view illustrating the structure of the fixing member 6, and FlG. 9 is a partially enlarged lateral cross-sectional view illustrating the structure of the fixing member.

[57] Referring to FIGS. 8 and 9, the fixing member 6 is installed at the outside of the cross beam 4-1 to fix the tension member 7 passing through the through-hole of the cross beam 4-1 using a bolt or the like.

[58] As shown in FlG. 8, the tension member 7 is installed to be slightly sloped inward, the fixing member 6 is also installed to be slightly sloped.

[59] FlG. 10 is a partial enlarged front view illustrating a structure in which a reinforcement frame 9 is attached to one side of the cross beam 4-1 and the lower surface of the main beam 2.

[60] As shown in FlG. 10, the reinforcement frame 9 is attached to the inside of the cross beam 4-1 and the lower surface of the cross beam 2 using a fastening member 10 such as a bolt to distribute forces applied to both the cross beams 4-1 and 4-2 by the tension forces of the plurality of tension members 7, thereby realizing a more stable support structure. [61] When the reinforcement frame 9 is attached to the cross beam 4-1, a reinforcement plate 10 is adhered to the inside of the cross beam 4-1 and the reinforcement member 10 and the reinforcement frame 9 are then fastened using a fastening member such as a bolt.

[62] Although the exemplary embodiments and the modified examples of the present invention have been described, the present invention is not limited to the embodiments and examples, but may be modified in various forms without departing from the scope of the appended claims, the detailed description, and the accompanying drawings of the present invention. Therefore, it is natural that such modifications belong to the scope of the present invention. Industrial Applicability

[63] A long-span temporary bridge using cross beams having through-holes according to the present invention can apply to a temporary support for installing a bridge slab or a structure having a long-span bridge function as well as a simple temporary bridge.

Claims

[1] A long-span temporary bridge having a plurality of bridge posts, a plurality of main beams installed on the bridge posts, and a plurality of deck plates installed on the main beams, comprising: a first cross beam which is installed on the lower surfaces of the plurality of main beams between the bridge posts to cross the plurality of main beams and has a plurality of through-holes formed therein; a second cross beam which is installed on the lower surfaces of the plurality of main beams to cross the plurality of main beams and to be spaced apart from the first cross beam and has a plurality of through-holes formed therein; a plurality of tension members which is connected between the first cross beam and the second cross beam and of which the both ends pass through the through- holes formed in the first cross beam and the second cross beam and are protruded from the first cross beam and the second cross beam; and a plurality of fixing members which is installed at one sides of the first cross beam and the second cross beam to fix the both ends of the tension members.

[2] The long-span temporary bridge according to claim 1, further comprising: a third cross beam which is installed on the lower surfaces of the main beams at an intermediate portion between the first cross beam and the second cross beam to cross the plurality of main beams; and saddles which are installed on the lower surface of the third cross beam and in which the tensions member are positioned.

[3] The long-span temporary bridge according to claim 2, wherein the number of the through-holes formed in the first cross beam and the second cross beam at p ositions between the main beams is at least one.

[4] The long-span temporary bridge according to claim 2 or 3, wherein the through- holes are formed in the first and second cross beams at position corresponding to the main beams.

[5] The long-span temporary bridge according to claim 1, further comprising a reinforcement frame attached to one sides of the first cross beam and the second cross beam and the lower surfaces of the main beams.

[6] The long-span temporary bridge according to claim 1, wherein the both ends of te main beams are seated on connection slabs.