WO2002018927A1 - Dispositif de controle de structure - Google Patents
Dispositif de controle de structure Download PDFInfo
- Publication number
- WO2002018927A1 WO2002018927A1 PCT/JP2000/005797 JP0005797W WO0218927A1 WO 2002018927 A1 WO2002018927 A1 WO 2002018927A1 JP 0005797 W JP0005797 W JP 0005797W WO 0218927 A1 WO0218927 A1 WO 0218927A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- vibration
- pressure medium
- spring
- coil
- chamber
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/46—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by spectral analysis, e.g. Fourier analysis or wavelet analysis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/045—Analysing solids by imparting shocks to the workpiece and detecting the vibrations or the acoustic waves caused by the shocks
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/36—Detecting the response signal, e.g. electronic circuits specially adapted therefor
- G01N29/42—Detecting the response signal, e.g. electronic circuits specially adapted therefor by frequency filtering or by tuning to resonant frequency
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
- G01N3/405—Investigating hardness or rebound hardness by determining the vibration frequency of a sensing element in contact with the specimen
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; ceramics; glass; bricks
- G01N33/383—Concrete, cement
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0039—Hammer or pendulum
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0062—Crack or flaws
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/026—Specifications of the specimen
- G01N2203/0284—Bulk material, e.g. powders
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0617—Electrical or magnetic indicating, recording or sensing means
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/015—Attenuation, scattering
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0232—Glass, ceramics, concrete or stone
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02827—Elastic parameters, strength or force
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/10—Number of transducers
- G01N2291/102—Number of transducers one emitter, one receiver
Definitions
- the present invention relates to an apparatus for detecting an abnormality or a defect inside a concrete structure.
- FIG. 17 shows the sound pressure level of a tapping sound detected by a sound pressure detection device such as a microphone-mouth phone, which is disclosed in, for example, Japanese Patent Application Laid-Open No. This is a conventional device that detects defects.
- reference numeral 2001 denotes a concrete product
- reference numeral 2003 denotes a hammer device having a hammer head 200
- reference numeral 2000 denotes a high-speed Fourier converter
- non-destructive inspections are based on the following principle: an inspector taps the measuring surface with an inspection hammer and detects defects inside the concrete structure due to the difference in the tone of the sound produced at that time.
- This method is a test based on human sensory feelings, and the judgment criteria are not constant, and the test results vary depending on the experience, intuition, and skill of the inspector, and the record of the test result is ambiguous. .
- Japanese Patent Application Laid-Open No. Hei 7-20997 discloses a method of detecting the sound pressure of a tapping sound with a sound level meter and identifying internal defects at that level. It is shown.
- concrete products 2 001 is hammered with a constant impact force using a hammer device 203 to which a hammer head 200 is attached.
- the tapping sound generated at that time is collected by a sound level meter 204 and converted into an electric signal.
- the hammering sound converted into an electric signal is recorded by the fast Fourier transformer 200 and output by the display device 206.
- the impact generated on the concrete product 2001 by the impact becomes vibration on the surface, and this vibration vibrates the air at the interface and propagates as sound.
- This sound is converted into an electric signal via a sound collecting device such as a sound level meter 204. If there is an abnormality with reduced mechanical strength inside the concrete product 2001, the magnitude and frequency of vibration generated on the surface are different from the sound and frequency of the generated sound, unlike a normal case where there is no abnormality. Also vary accordingly. For this reason, internal defects can be detected by comparing the vibration frequency and sound pressure level of the impact sound converted into an electric signal.
- the level of the hitting sound detected varies greatly depending on the distance between the hitting point and the sound collecting device, its direction, and so on. It was necessary to change the force to be corrected and the set value of the criterion.
- the present invention is intended to solve the above-described problem.
- the vibration generated on the measurement surface is directly applied to the voltage without passing through a medium such as air.
- a structure diagnostic apparatus including: a vibration detector that detects a component in a frequency range; and a display device that displays a maximum amplitude of an output signal of the vibration detector. .
- the vibration detector is connected to a weight, a contact having one end capable of contacting with the object to be measured, and a spring having the other end connected to the weight, and connected to the weight.
- a vibration sensor that converts vibration of the weight into an electric signal, wherein a resonance frequency determined by a mass of the weight and a spring constant of the spring is set in the predetermined frequency range, and the object to be measured is determined by the vibration sensor. It detects a component of the elastic vibration generated on the surface of the object in the predetermined frequency range.
- the vibration detector is connected to a contact that can come into contact with the object to be measured, and a spring made of a metal material whose magnetic permeability changes due to bending strain; and A coil provided around the coil, and a weight connected to the spring, wherein the coil detects a 'bending strain' generated in the spring by elastic vibration generated on the surface of the object to be measured. is there.
- the vibrating device is configured such that: a striking unit that excites the measurement object to generate an elastic wave; a coil fixed to the striking unit; and a coil connected to the coil, and only in one direction of the coil.
- the vibrating device includes: a striking unit that generates an elastic wave on the measurement surface; a chamber accommodating the striking unit; a pressure medium injected into the chamber; A striking portion operating mechanism for projecting from the chamber to the outside, wherein the striking portion operating mechanism generates an elastic wave on the measurement surface with a constant excitation force by the striking portion. It is to let.
- the hitting portion operating mechanism includes an indicator for injecting a pressure medium into the chamber, and a pressure medium for supplying a pressure medium to the chamber when a distance between the chamber and the measurement surface becomes a predetermined value.
- a supply mechanism Preferably, the pressure medium supply mechanism includes: a cylinder for storing the pressure medium; a pressure regulator for regulating the pressure of the pressure medium in the cylinder; and a pressure medium in the cylinder via the pressure regulator. And a trigger mechanism for triggering the supply switch when a distance between the chamber and the measurement surface reaches a predetermined value.
- the pressure medium supply mechanism includes a compressor connected to the injector for supplying the pressure medium, a supply switch for supplying the pressure medium in the compressor to the injector, the chamber and the measurement device.
- the pressure medium supply mechanism has one end connected to the housing of the vibrating device, the other end connected to the trigger mechanism, and biasing the trigger mechanism away from the supply switch. Is further provided. ⁇
- the display device includes: an amplifier having an input terminal and an output terminal connected to the vibration detector; a first input terminal connected to an output terminal of the amplifier; and a second terminal to which a reference voltage is applied.
- a plurality of output terminals each having an input terminal and an output terminal, generating an output from the output terminal when an input voltage of the first input terminal exceeds a reference voltage of the second input terminal; It is provided with a comparator, and a plurality of display units respectively connected to the output terminals of the comparators, and the reference voltages applied to the output terminals of the comparators are set to different values.
- the predetermined frequency range of the elastic vibration is less than or equal to the number k H Z.
- the predetermined frequency range of the electric signal is several kHz or less.
- the internal defects to be considered in the present invention are cracks generated inside a concrete structure, peeling of the surface layer, or a phenomenon called "Jyanka", in which the cement is non-uniform and its mixing ratio is lower than a predetermined range. This indicates the portion where the ratio of aggregate has increased and the mechanical strength has fallen below a predetermined range.
- the vibration amplitude level between the part where internal defects exist and the healthy part has a relationship as shown in Fig. 12.
- the vibration amplitude level makes it possible to discriminate between the two.
- the distance (depth) from the surface to the defect can be estimated from the relationship shown in Fig.13.
- FIG. 1 is a Prog diagram showing a configuration of a structure diagnostic apparatus according to Embodiment 1 of the present invention.
- FIG. 2 is a waveform diagram showing a frequency response waveform when a concrete structure is hit.
- FIG. 3 is a waveform chart showing the vibration characteristics of the vibration detector of the present invention.
- FIG. 4 is a waveform diagram showing a response waveform at the time of impact when the concrete structure according to the present invention has no internal defect.
- FIG. 5 is a waveform diagram showing a response waveform at the time of impact when the concrete structure according to the present invention has an internal defect.
- FIG. 6 is a block diagram showing an example of the configuration of the display device according to Embodiment 1 of the present invention.
- FIG. 7 is a graph showing the operation of the display device.
- FIG. 8 is a diagram showing a schematic configuration of the vibration detector according to Embodiment 1 of the present invention.
- FIG. 9 shows the configuration of a vibration device according to Embodiment 1 of the present invention, wherein (a), (b) and (c) show different operating states.
- FIG. 10 is a partially enlarged view of the vibration device.
- FIG. 11 is a flowchart showing a structure diagnostic method according to Embodiment 2 of the present invention.
- FIG. 12 is a diagram showing the relationship between the vibration amplitude level and the internal defect of the concrete structure according to the present invention.
- FIG. 13 is a diagram showing the relationship between the vibration amplitude level of the concrete structure according to the present invention and the distance from the measurement surface to the internal defect.
- FIG. 14 is a diagram showing a configuration of a vibration detector according to Embodiment 3 of the present invention.
- FIG. 15 is a diagram showing a vibration device according to Embodiment 4 of the present invention.
- FIG. 16 is a block diagram showing another example of the configuration of the display device according to Embodiment 5 of the present invention.
- FIG. 7 is a diagram showing an example of a schematic configuration of a conventional structure diagnostic apparatus.
- FIG. 1 is a block diagram showing a schematic configuration of a structure diagnostic apparatus according to Embodiment 1 of the present invention.
- the structure diagnostic apparatus according to Embodiment 1 includes a vibration detector 11 for detecting vibration of a concrete building 14 and a vibration device for applying vibration to a concrete building 14. 1 and 2 and a display device 13 for displaying the vibration detected by the vibration detector 11. .
- Figures 2 (a) 'and () show the vibration response of the concrete structure 14 displayed on the display device 13, and Figure 2 (a) shows the vibration characteristics of the part with internal defects. 2 (b) shows the vibration characteristics of a healthy part without internal defects.
- FIG. 3 shows the vibration characteristics of the vibration detector 11.
- Fig. 4 (a) shows the vibration waveform at a part where an internal abnormality exists
- Fig. 4 (b) shows the vibration waveform at a healthy part
- Fig. 5 (a) and Fig. 5 (b) show the waveform after the impact sound at that time was detected by the microphone and passed through a band-pass filter having the same band pass band.
- Figure 5 (a) shows the response observed at the site where internal defects exist
- Figure 5 (b) shows the response observed at a healthy site where no internal defects exist.
- FIG. 6 is a block diagram showing an example of the configuration of the display device 13.
- the display device 13 has an amplifier 51 whose input terminal 51-1 is connected to the input signal line 50, and a comparison signal input terminal 52-1 which is an output terminal 51 of the amplifier 51.
- the reference input terminal 52-2 has a comparator 52 connected to the reference power supply, and an LED 53 connected to the output terminal 52-3 of the comparator 52.
- FIG. 7 shows a time axis waveform showing the operation of the comparator 52, where V i ⁇ is the input voltage of the comparison signal input terminal 52-1 of the comparator 52, and V ⁇ is the reference input terminal of the comparator 52.
- Vout represents the reference input voltage of 52-2, and Vout represents the output terminal 52-3 of the comparator 52.
- FIG. 8 is a diagram showing the configuration of the vibration detector 11.
- the vibration detector 11 is configured by connecting a contact 11 to a weight 11 1 via a spring 11.
- the weight 1 1 1 is connected to the spring 1 1 2 and is brought into contact with the measuring surface via the contact 1 1 3.
- Vibration voltage change «1 1 4 converts the vibration into voltage.
- it is connected to the weight 1 1 3 ', and the vibration that reaches the contact 1 1 3 becomes the spring 1 1 2 and the weight 1 1 It is transmitted via 1 to the oscillating voltage converter 1 14.
- the vibration transmitted to the oscillating voltage converter 11 14 is converted into an electric signal there and output from the vibration detector 11.
- the oscillating voltage change «1 1 4 ' is connected to the input signal line 50 of the display device 13, and the output signal is supplied to the display device 13 via the input signal line 50, and the measurement result is output. Displayed on display device 13.
- this vibration system has a resonance frequency f o as shown in the following equation (1).
- the weight 11 1 When vibration is externally applied to this system, the weight 11 1 causes a resonance phenomenon at this resonance frequency ⁇ . That is, a component that matches the resonance frequency f ⁇ of the vibration input from the outside is selectively emphasized. Therefore, when a vibration voltage converter 114 such as an acceleration sensor is fixed to this weight 111, the component that matches the resonance frequency fo of the vibration input from the contact 113 is emphasized, and the vibration is detected. Output from the device 11 1.
- the vibration detector 11 that selectively detects a moving component and converts it into an electric signal can be obtained.
- FIGS. 9A to 9C show an example of the vibration device 12.
- the vibrating device 1 2 latches a rod-shaped hitting portion 13 1, a spring 13 2 such as a coil spring connected to the hitting portion 13 1, and a hitting portion 13 1 Latch mechanism 1.33 for rotation and a latch position (FIG.
- the hitting portion 13 1 is attached to the housing of the vibration device 12 via a spring 1.32, and the spring 13 2 in a state where no external force is applied has a natural length Lo.
- the contraction length of the spring 13 is fixed to a fixed length and the striking part 13 1 is released, the striking angle and striking speed of the measurement surface can be kept constant, and there is no personality. Stable judgment is possible.
- the magnetic field generated in the contraction direction of the spring 132 by the permanent magnet 1336 fixed to the housing of the vibrating device 12 causes the perimeter of the hitting portion 131 to cross the magnetic field in a direction crossing the magnetic field.
- a magnetic force is applied to the provided coil 13 7 to vibrate the coil 13 7 and the hitting portion 13 1 released from the release mechanism 13 4.
- An induced electromotive force is generated in the coil 1337, and a current flows according to the vibration speed, thereby generating a magnetic flux. 'Therefore, a magnetic force always occurs in the opposite direction to the direction of vibration, and the vibration is damped.
- a current flows through the coils 1 and 37 when the springs 13 and 2 contract, and a diode 13 and 8 are connected to the coils 13 and so that no current flows when they are pushed out. .
- the release mechanism 13 4 is released and the striking section 13 1 is pushed out of the vibrating device 12
- the striking section 13 1 receives no braking from the coil 13 7, and
- braking is applied.
- the speed of the hitting portion 131 can be detected by detecting a current or the like generated in the coil when the hitting portion 131 moves. Becomes possible. Therefore, by detecting the timing at which the hammer 13 1 (hammer) is released, and sampling the output of the vibration detector 11 in synchronization with it, the influence of disturbance is small and a signal corresponding to the impact is selected. It is also possible to obtain it objectively.
- the vibration detector 11 is brought into contact with an arbitrary point on the surface of the concrete structure 14 to be measured. At this time, when an impact is applied to the surface of the concrete structure 14 (hereinafter, referred to as a measurement surface) by the vibration device 12, elastic vibration is generated on the measurement surface.
- the vibration detector 11 detects the generated vibration and converts it into an electric signal.
- the vibration detector 11 has a function of outputting an electric signal according to the magnitude of the vibration, and the higher the amplitude of the electric signal converted here, the larger the vibration.
- Display devices 13 include The electric signal converted by the vibration detector 11 is input.
- the display device 13 is configured to detect the amplitude of the input electric signal and display the magnitude.
- Fig. 2 (a) shows the vibration characteristics of a part with a defect inside
- Fig. 2 (b) shows the vibration characteristics of a part with no defect inside.
- the waveform after frequency conversion by converting the detected vibration to an electric signal is displayed, and the higher the amplitude level, the larger the amplitude of the vibration.
- a low-frequency vibration component of several kHz or less appears remarkably in a portion where a defect exists.
- the magnitude is more than 10 times, and it can be seen that the level of vibration is remarkably different between the two.
- the vibration detector 11 has a characteristic with high sensitivity centered on 1 kHz, and an iron ball with a certain mass is dropped from a certain height to give a certain impact force. Is added to the measurement surface, and the vibration generated on the measurement surface at this time is detected by the vibration detector 11, and as shown in FIG. Vibration with a magnitude greater than 10 times that of the non-existing part is observed (Fig. 4 (b)).
- a similar impact was applied from the outside to the same site, and the impulsive sound generated at that time was detected by Microphone and the response waveform was obtained.
- Figure 5 (a) shows the response at the site where the internal defect exists
- Figure 5 (b) shows the response at the healthy part.
- FIG. 6 is a block diagram showing a configuration of the display device 13.
- An electric signal converted by the vibration detection device 11 is input to an input signal line 50.
- the input signal line 50 is connected to the input terminal 51-1 of the amplifier 51, the amplitude of the input signal is amplified by the amplifier 51 at an appropriate amplification rate, and is output from the output terminal 51-2.
- reference voltage Vo is applied to reference input terminal 52-2 of comparator & 2.
- an LED 53 is connected as a display device.
- a constant reference voltage V o is always supplied to the reference input terminal 52-2, and when the voltage Vin of the comparison signal input terminal 52-1 exceeds V o.
- the voltage of the output terminal 52-3 of the comparator 5'2 outputs Vout0 which is set in advance.
- An output device such as an LED 53 is connected to the output terminal 52-3 of the comparator 52. When the voltage of the output terminal 52-3 becomes Vout, a current flows, and the LED 53 turns on. Is done.
- a method of using a hammer by an inspector or a mechanical striking mechanism may be considered.However, since the stability of the vibrating force is limited by manual striking, a mechanical striking mechanism is used. If a mechanism that vibrates with a constant force is adopted, accurate judgment with less personality becomes possible. In addition, by recording and storing the output signal converted to an electrical signal by the vibration detector 11, it is possible to quantitatively know the change over time of internal abnormalities (defects), which is difficult with a hammering test using a conventional hammer. Becomes
- the vibration detector has a characteristic to selectively detect components of several kHz or less, and several kHz or less that is specifically generated in a part where a defect exists inside and a muddy sound occurs This makes it possible to efficiently detect the vibration of the structure and to realize a structure diagnostic apparatus that can easily discriminate from a portion having no defect inside.
- FIG. 11 is a flowchart showing a method for diagnosing an internal defect of a concrete structure according to the present invention.
- FIG. 12 is a graph showing amplitude levels of vibrations generated when a portion where an internal defect is present and a healthy portion are excited with a constant force.
- Figure 13 is a graph showing the relationship between the amplitude level of the vibration measured at the part where the internal defect exists and the distance (depth) from the measurement surface to the internal defect.
- Diagnosis of an internal defect of a concrete structure is performed by using the above-described structure diagnostic apparatus according to the procedure shown in the flowchart of FIG. First, it is determined whether or not a force exists in the database relating to the vibration level of the healthy part and the abnormal part (step S 1). If the force does not exist, the internal defect is generated by the vibration device 12 that generates a constant vibration force. An impact is given to existing and healthy parts (step S 2), and each occurs. The vibration level is detected (step S 3), and a predetermined frequency range (preferably several kHz or less) is detected. The maximum amplitude level of the component is calculated (step S4), and a database relating to the vibration levels of the healthy part and the abnormal part is constructed (step S5).
- the amplitude of the vibration measured on the surface of the structure is obtained; the internal state is confirmed by coring the measurement point of the structure, and the relationship between the two is determined. Plot in the graph shown. Then, a threshold value for discriminating the two is obtained from the graph (step S6).
- step S1 if the above-mentioned database exists, a shock is applied to the new inspection point by the vibration device 12 having the same vibration force as that at the time of the above-mentioned investigation (step S7). Then, the level of the generated vibration is measured (step S8), the maximum amplitude level of the component in the above-mentioned predetermined frequency range is calculated (step S9), and compared with the previously obtained threshold value (step S10). ). As a result, the level of the measured vibration is larger than the threshold.
- step S11 it is determined that there is an abnormality inside (step S11), and if it is smaller than the threshold value, it is determined that the location is sound (step S12).
- step S11 it is determined that there is an abnormality inside (step S11)
- step S12 it is determined that the location is sound (step S12).
- Fig. 12 when comparing the vibration level generated at a healthy part and the part where an internal defect exists, they are separated from each other at a certain threshold.
- Fig. 12 if the threshold value for identifying the sound part and the part where the internal defect exists is set to V o, then, when the part where the defect exists inside is excited by the same impact force, Since the input signal level of the display device 13 exceeds the threshold value Vo, the LED 53 is turned on, and it is possible to determine that there is a defect inside. .
- the above thresholds are constructed to distinguish between healthy and abnormal (defect) locations. Force The response of an abnormal location also varies in the level of vibration generated depending on the material and the size and depth of the abnormal location.
- Fig. 13 shows the results of a similar procedure for investigating the relationship between the magnitude of vibration and the distance from the surface to the peeled part (the part where the aggregate etc. peeled off from the surrounding cement) as an example of an abnormal spot. It was found that a strong correlation was found between the two. Therefore, by setting the threshold value according to the depth of up to exfoliation unit to the comparator 5 2 There 5 2 2, 5 2 3 their respective reference voltages V have V 2, V 3 of FIG. 8, lighted LED 5 It is possible to know the distance to the internal defect by the number of 3, in this case, in 4 steps.
- the second embodiment it is possible to directly observe the vibration generated on the measurement surface under a constant level of excitation, so that sound diffusion in a medium such as air can be prevented. It is possible to easily obtain information on the inside of a structure by comparing it with a pre-measured database without being affected by attenuation or external noise.
- FIG. Fig. 14 shows an example in which the vibration detector 11A is composed of a leaf spring.
- each leaf spring 1 1 2-2 is a coil that converts a change in magnetic permeability into an electric signal. It is wound by 1 2 1.
- the vibration reaching the probe 1 1 3 is transmitted to the weight 1 1 1 via the leaf spring 1 1 2-2.
- the resonance frequency fo determined by the mass M of the weight 1 11 and the spring constant k of the leaf spring 1 1 2-2 is obtained by the relationship shown in the above equation (1). .
- the leaf spring 2.-2 is made of a material whose magnetic permeability changes with a given strain, such as a metal-based magnetostrictive material.
- a bending strain occurs in the leaf spring 1 1 2-2, and the magnetic permeability of the magnetostrictive material changes accordingly.
- a leaf spring 1. 1 2-2 is used as a core and a coil 12 1 is arranged around the core, an electromotive force is generated in the coil 12 1 according to the change in the magnetic permeability of the core.
- the greater the bending strain generated in the magnetostrictive material the greater the change in magnetic permeability.
- the voltage generated in the coil 12 1 increases, so the weight 1.1 1 It is possible to obtain a voltage corresponding to the magnitude of the vibration transmitted to the motor, that is, an electric signal.
- the vibration transmitted to the weight 1 1 1 is directly detected by the leaf spring 1 1 2-2 connected to the weight 1 1. It is possible to obtain a vibration detector 11A with a smaller vibration detection delay in the sensor than in the case where an output is generated by fixing the vibration voltage converter 114, for example. Also, there is no need to fix the vibration voltage converter 114 such as an acceleration sensor to the weight 111, and it is possible to obtain a small, lightweight, inexpensive, high detection sensitivity, vibration detector 11A. Becomes Embodiment 4.
- FIG. 15 shows another example of the vibration device.
- Other configurations of the fourth embodiment are the same as those of the first embodiment.
- a vibrating device 12 A is a rod-shaped hitting portion having one end formed in a spherical shape.
- a compressed air supply switch 14 6 provided on the air injector 14 3, and a spring 14 8, And a trigger mechanism (147) having a switch operating part (149) for operating the compressed air supply switch (146).
- the clearance between the outer shape of the hitting part 14 1 and the inner diameter of the chamber 14 2 is sufficiently small.
- compressed air is supplied into the chamber 14 2 from the air-injector 1.43, the hitting part 14 1 is pushed and projects outward from the open end of the chamber 1 1 4 2.
- '' Compressed air is stored in the cylinder 1.44, and the pressure is adjusted to an appropriate level by the pressure regulator 144 to be supplied to the air injector 144.
- the trigger mechanism 147 contacts the measurement surface and resists the biasing force of the spring 148. Move in the direction into the 12 A housing.
- the switch actuating section 1449 provided on the 'trigger mechanism ⁇ ' 47 comes into contact with and presses the compressed air supply switch 146, and compressed air is released from the air ejector 144. It is supplied into the chamber 144, and the tip of the striking portion 141 projects outward from the opening end thereof to strike the measurement surface of the concrete structure 14.
- the compressed air supply switch If it is configured to supply compressed air by pressing 1 4 6, the open end of the chamber 1 4 2 can always be hit by the hitting section 1 4 1 while keeping a certain distance from the measurement surface
- a vibration mechanism capable of repeatedly performing the impact by attaching a return mechanism, such as a magnet or a spring, for returning the impact section 141 to the initial position after the impact is applied to the impact section 141 as well.
- a simple and small vibration device 12 can be realized; a structure diagnostic device capable of repeatedly hitting a measurement surface with a constant vibration force. ⁇ It becomes possible to obtain Also, by adjusting the pressure of the compressed air, it becomes possible to easily adjust the vibration of the caro.
- FIG. 'FIG. 16' shows another example of the display device.
- Other configurations of the fourth embodiment are the same as those of the first embodiment.
- the display device 13 A is provided with a plurality of comparators 52 to 52 3 which are placed in parallel with each other, by setting the respective reference voltages to different values , 'LED 53 number of ⁇ to 53 3 Heni spoon stepwise display is easily possible to light up in response to the amplitude of the input waveform.
- their respective comparators 52 i ⁇ 52 3 input terminals 52 i-:! The output of the amplifier 51 is divided and supplied to 5252 3 — 1.
- the LEDS'Si S 3 3 Lights up. That is, by appropriately adjusting the reference voltage Vi Vg, it is possible to change the number of LED 53 i ⁇ 53 3 to be turned depending on the amplitude of the input waveform.
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002503072A JP3813580B2 (ja) | 2000-08-28 | 2000-08-28 | 構造物検査装置 |
PCT/JP2000/005797 WO2002018927A1 (fr) | 2000-08-28 | 2000-08-28 | Dispositif de controle de structure |
EP00955069A EP1236996A4 (en) | 2000-08-28 | 2000-08-28 | DEVICE FOR INSPECTION OF A STRUCTURE |
US10/070,379 US6880403B1 (en) | 2000-08-28 | 2000-08-28 | Structure inspection device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2000/005797 WO2002018927A1 (fr) | 2000-08-28 | 2000-08-28 | Dispositif de controle de structure |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002018927A1 true WO2002018927A1 (fr) | 2002-03-07 |
Family
ID=11736400
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2000/005797 WO2002018927A1 (fr) | 2000-08-28 | 2000-08-28 | Dispositif de controle de structure |
Country Status (4)
Country | Link |
---|---|
US (1) | US6880403B1 (ja) |
EP (1) | EP1236996A4 (ja) |
JP (1) | JP3813580B2 (ja) |
WO (1) | WO2002018927A1 (ja) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004354116A (ja) * | 2003-05-28 | 2004-12-16 | Mitsubishi Electric Corp | 検査装置および検査方法 |
JP2012168022A (ja) * | 2011-02-15 | 2012-09-06 | Sato Kogyo Co Ltd | コンクリート系構造物の品質診断方法 |
CN103630605A (zh) * | 2013-11-28 | 2014-03-12 | 中南大学 | 一种预应力锚索管道注浆质量检测方法 |
WO2015145914A1 (ja) * | 2014-03-28 | 2015-10-01 | 日本電気株式会社 | アンカーボルトの診断システム、その方法およびプログラム |
JP2016090376A (ja) * | 2014-11-05 | 2016-05-23 | 新川センサテクノロジ株式会社 | 逆磁歪形振動速度センサ及びこれを用いた測定方法 |
JP2017090315A (ja) * | 2015-11-12 | 2017-05-25 | 国立大学法人 鹿児島大学 | 診断システム、移動装置、診断装置、及び診断プログラム |
CN110220659A (zh) * | 2018-06-19 | 2019-09-10 | 韩玉锐 | 一种桥柱裂纹检测装置 |
CN114018705A (zh) * | 2021-11-08 | 2022-02-08 | 水利部交通运输部国家能源局南京水利科学研究院 | 混凝土自由断裂全过程控制可视化追踪试验系统及方法 |
Families Citing this family (24)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7151348B1 (en) * | 2003-04-14 | 2006-12-19 | Matsushita Electric Industrila Co., Ltd. | Motor driving apparatus |
ES2263307B1 (es) * | 2003-05-23 | 2007-09-16 | Asociacion De Investigacion De Industrias De La Construccion Aidico | Procedimiento de diagnostico de la calidad, en bloques de roca ornamental de grandes dimensiones y dispositivos para su puesta en practica. |
JP3944558B2 (ja) * | 2003-11-11 | 2007-07-11 | 国立大学法人群馬大学 | 材料試験方法 |
US20070068225A1 (en) | 2005-09-29 | 2007-03-29 | Brown Gregory C | Leak detector for process valve |
WO2007067084A1 (en) * | 2005-12-06 | 2007-06-14 | Otkrytoe Akzionernoe Obschestvo 'moscow Committee Of Science And Technologies' | Method and system for determining a stability of constructions |
US20070144260A1 (en) * | 2005-12-27 | 2007-06-28 | Dong Fei | Non-destructive evaluation of particulate filters |
DE102006016076B3 (de) * | 2006-04-04 | 2007-11-08 | Werner Rogg | Vorrichtung und Verfahren zur Prüfung des Spiels von Gelenken an Fahrzeugen |
US7913566B2 (en) * | 2006-05-23 | 2011-03-29 | Rosemount Inc. | Industrial process device utilizing magnetic induction |
US8898036B2 (en) | 2007-08-06 | 2014-11-25 | Rosemount Inc. | Process variable transmitter with acceleration sensor |
US7698945B2 (en) * | 2007-11-08 | 2010-04-20 | Caterpillar Inc. | System and method for detecting internal flaws in a particulate filter |
US8250924B2 (en) | 2008-04-22 | 2012-08-28 | Rosemount Inc. | Industrial process device utilizing piezoelectric transducer |
US7977924B2 (en) * | 2008-11-03 | 2011-07-12 | Rosemount Inc. | Industrial process power scavenging device and method of deriving process device power from an industrial process |
DE102013201324A1 (de) | 2013-01-28 | 2014-07-31 | Aktiebolaget Skf | Vorrichtung und Verfahren zum Bestimmen einer Lagervorspannung |
US10186253B2 (en) * | 2015-10-05 | 2019-01-22 | Olympus Corporation | Control device for recording system, and recording system |
JP6688619B2 (ja) * | 2016-01-28 | 2020-04-28 | オリエンタル白石株式会社 | 衝撃弾性波法に用いる打撃装置 |
JP6805445B2 (ja) * | 2016-05-12 | 2020-12-23 | 株式会社フジタ | 検査対象物の状態評価装置 |
KR101865745B1 (ko) * | 2016-10-27 | 2018-06-08 | 현대자동차 주식회사 | 판재의 접합품질 평가장치 |
CN108732051B (zh) * | 2017-04-15 | 2020-11-17 | 张民录 | 细薄混凝土构件强度回弹的试验检测方法 |
JP2018200217A (ja) * | 2017-05-26 | 2018-12-20 | 国立研究開発法人産業技術総合研究所 | 打音検査装置及び打音検査方法 |
DE102017114651A1 (de) * | 2017-06-30 | 2019-01-03 | Rudi Hachenberg | Verfahren und Vorrichtung zur Bewertung der Verbindungsqualität von Anschlageinrichtungen |
JP6773612B2 (ja) * | 2017-07-11 | 2020-10-21 | 株式会社東芝 | 音響検査装置、音声信号取得装置、音響検査システム、および音響検査方法 |
JP6506817B1 (ja) * | 2017-11-13 | 2019-04-24 | 東急建設株式会社 | 構造物の点検方法 |
JP2021073459A (ja) * | 2021-01-29 | 2021-05-13 | 国立研究開発法人産業技術総合研究所 | 打音検査装置及び打音検査方法 |
CN113390962A (zh) * | 2021-04-30 | 2021-09-14 | 同济大学 | 基于定向敲击的可植入式混凝土构件损伤监测装置及方法 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01219555A (ja) * | 1988-02-26 | 1989-09-01 | Mitsubishi Petrochem Co Ltd | 衝撃試験器 |
JPH0392758A (ja) * | 1989-09-05 | 1991-04-17 | Akebono Brake Res & Dev Center Ltd | 製品検査方法 |
JP2000131290A (ja) * | 1998-10-23 | 2000-05-12 | Mitsubishi Electric Corp | コンクリートの非破壊検査装置 |
Family Cites Families (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3580056A (en) * | 1967-10-12 | 1971-05-25 | Hayes Albion Corp | Nondestructive, resonant testing apparatus with magnetic pickup |
US3859847A (en) * | 1972-09-06 | 1975-01-14 | Westinghouse Electric Corp | Vibration monitoring device using accelerometer to measure displacement |
US3867836A (en) * | 1973-03-26 | 1975-02-25 | Us Navy | Crack detection apparatus and method |
IE45963B1 (en) * | 1977-06-27 | 1983-01-12 | Anderson F | A vibration sensing device |
US4163393A (en) * | 1978-08-04 | 1979-08-07 | The Unites States Of America As Represented By The Secretary Of The Interior | Void detector system |
US4479389A (en) * | 1982-02-18 | 1984-10-30 | Allied Corporation | Tuned vibration detector |
CH662886A5 (de) * | 1983-10-12 | 1987-10-30 | Walter Dr Beer | Verfahren zum bestimmen der qualitaet von ballschlaegern. |
US4699006A (en) * | 1984-03-19 | 1987-10-13 | The Charles Stark Draper Laboratory, Inc. | Vibratory digital integrating accelerometer |
US4679033A (en) * | 1986-03-18 | 1987-07-07 | Hwang Shih Ming | Structure of vibration sensor |
US5054606A (en) * | 1988-05-11 | 1991-10-08 | General Kinematics Corporation | Control system for vibratory apparatus |
US5152401A (en) * | 1989-10-13 | 1992-10-06 | The United States Of America As Representd By The Secretary Of Agriculture | Agricultural commodity condition measurement |
US5309149A (en) * | 1992-02-12 | 1994-05-03 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Smart accelerometer |
JP2500373B2 (ja) * | 1993-11-09 | 1996-05-29 | 工業技術院長 | 原子間力顕微鏡及び原子間力顕微鏡における試料観察方法 |
JP2743314B2 (ja) * | 1995-02-16 | 1998-04-22 | 北石産業株式会社 | 振動検知素子及び振動検知器 |
JPH08334431A (ja) * | 1995-06-09 | 1996-12-17 | Mitsubishi Electric Corp | 非破壊検査装置 |
JPH10253339A (ja) * | 1997-03-06 | 1998-09-25 | Mitsubishi Electric Corp | 音波利用計測方法及び計測装置 |
US5808202A (en) * | 1997-04-04 | 1998-09-15 | Passarelli, Jr.; Frank | Electromagnetic acoustic transducer flaw detection apparatus |
JP3551033B2 (ja) * | 1998-08-28 | 2004-08-04 | 日本精工株式会社 | 軸受剛性評価装置および方法 |
DE69921084T8 (de) * | 1998-09-01 | 2006-04-27 | Matsuhashi Techno Research Co., Ltd. | Zerstörungsfreie Prüfung ( Ultraschall ) mit positiver Rückkopplungsschleife und Filter |
US6298729B1 (en) * | 1999-07-13 | 2001-10-09 | Corning Incorporated | Catalytic converter testing |
DE19938722B4 (de) * | 1999-08-16 | 2010-10-07 | Prüftechnik Dieter Busch AG | Verfahren und Vorrichtung zur Analyse von Wälzlagern in Maschinen |
US6629448B1 (en) * | 2000-02-25 | 2003-10-07 | Seagate Technology Llc | In-situ testing of a MEMS accelerometer in a disc storage system |
WO2002016925A1 (fr) * | 2000-08-23 | 2002-02-28 | Mitsubishi Denki Kabushiki Kaisha | Dispositif non destructif d'inspection |
-
2000
- 2000-08-28 WO PCT/JP2000/005797 patent/WO2002018927A1/ja active Application Filing
- 2000-08-28 EP EP00955069A patent/EP1236996A4/en not_active Withdrawn
- 2000-08-28 US US10/070,379 patent/US6880403B1/en not_active Expired - Fee Related
- 2000-08-28 JP JP2002503072A patent/JP3813580B2/ja not_active Expired - Fee Related
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH01219555A (ja) * | 1988-02-26 | 1989-09-01 | Mitsubishi Petrochem Co Ltd | 衝撃試験器 |
JPH0392758A (ja) * | 1989-09-05 | 1991-04-17 | Akebono Brake Res & Dev Center Ltd | 製品検査方法 |
JP2000131290A (ja) * | 1998-10-23 | 2000-05-12 | Mitsubishi Electric Corp | コンクリートの非破壊検査装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1236996A4 * |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2004354116A (ja) * | 2003-05-28 | 2004-12-16 | Mitsubishi Electric Corp | 検査装置および検査方法 |
JP2012168022A (ja) * | 2011-02-15 | 2012-09-06 | Sato Kogyo Co Ltd | コンクリート系構造物の品質診断方法 |
CN103630605A (zh) * | 2013-11-28 | 2014-03-12 | 中南大学 | 一种预应力锚索管道注浆质量检测方法 |
WO2015145914A1 (ja) * | 2014-03-28 | 2015-10-01 | 日本電気株式会社 | アンカーボルトの診断システム、その方法およびプログラム |
US10261052B2 (en) | 2014-03-28 | 2019-04-16 | Nec Corporation | Anchor bolt diagnosing system, method of the same, and program of the same |
JP2016090376A (ja) * | 2014-11-05 | 2016-05-23 | 新川センサテクノロジ株式会社 | 逆磁歪形振動速度センサ及びこれを用いた測定方法 |
JP2017090315A (ja) * | 2015-11-12 | 2017-05-25 | 国立大学法人 鹿児島大学 | 診断システム、移動装置、診断装置、及び診断プログラム |
CN110220659A (zh) * | 2018-06-19 | 2019-09-10 | 韩玉锐 | 一种桥柱裂纹检测装置 |
CN114018705A (zh) * | 2021-11-08 | 2022-02-08 | 水利部交通运输部国家能源局南京水利科学研究院 | 混凝土自由断裂全过程控制可视化追踪试验系统及方法 |
Also Published As
Publication number | Publication date |
---|---|
JP3813580B2 (ja) | 2006-08-23 |
EP1236996A1 (en) | 2002-09-04 |
US6880403B1 (en) | 2005-04-19 |
EP1236996A4 (en) | 2008-03-05 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP3813580B2 (ja) | 構造物検査装置 | |
JP4311680B2 (ja) | 構造物検査装置 | |
JPH0130104B2 (ja) | ||
JP6241927B2 (ja) | コンクリート構造物の診断方法 | |
JP2010271116A (ja) | 健全性診断用打撃ハンマ及びこれを用いたコンクリート構造物の健全性診断方法 | |
JP6688619B2 (ja) | 衝撃弾性波法に用いる打撃装置 | |
JPH1090234A (ja) | 構造物の内部欠陥の検知方法 | |
JP6130778B2 (ja) | 複合構造体の界面検査方法及び装置 | |
WO2010150109A1 (en) | Impact device for materials analysis | |
JPS63186122A (ja) | 構造物の異常診断方式 | |
US8006539B2 (en) | Actuation system | |
JP6806329B2 (ja) | 検査装置および検査方法 | |
JPH0843362A (ja) | 仕上げ面の剥離診断装置 | |
JP2004101413A (ja) | 固体内部の振動検査装置 | |
JP2009041978A (ja) | 打音解析による健全性診断方法 | |
JP2005148064A (ja) | 圧力テスト中またはテスト後の圧力容器の変化または損傷の検出装置と検出方法 | |
JP2003329656A (ja) | コンクリート吹付法面の密着度診断法とその装置 | |
JP4646012B2 (ja) | コンクリート構造物の非破壊検査装置 | |
WO1989004960A1 (en) | Non-destructive evaluation of ropes by using transverse vibrational wave method | |
JP2001124744A (ja) | コンクリート構造物の検査装置 | |
JP6861969B2 (ja) | 弾性波送受信プローブ、これを用いた測定装置及び測定方法 | |
Kang et al. | Low-power EMAT measurements for wall thickness monitoring | |
JP2004085412A (ja) | 固体内部の振動検査装置 | |
JP2004125674A (ja) | 電磁パルスを用いた非破壊コンクリート強度測定方法及びその装置 | |
JPS61193067A (ja) | 鋳鉄品の評価方法及び装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ENP | Entry into the national phase |
Ref country code: JP Ref document number: 2002 503072 Kind code of ref document: A Format of ref document f/p: F |
|
WWE | Wipo information: entry into national phase |
Ref document number: 10070379 Country of ref document: US |
|
AK | Designated states |
Kind code of ref document: A1 Designated state(s): JP US |
|
AL | Designated countries for regional patents |
Kind code of ref document: A1 Designated state(s): AT BE CH CY DE DK ES FI FR GB GR IE IT LU MC NL PT SE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2000955069 Country of ref document: EP |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application | ||
WWP | Wipo information: published in national office |
Ref document number: 2000955069 Country of ref document: EP |