CN103940911A - Detection device and method for service bridge inhaul cable/suspension cable anchor system - Google Patents

Detection device and method for service bridge inhaul cable/suspension cable anchor system Download PDF

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Publication number
CN103940911A
CN103940911A CN201410182969.5A CN201410182969A CN103940911A CN 103940911 A CN103940911 A CN 103940911A CN 201410182969 A CN201410182969 A CN 201410182969A CN 103940911 A CN103940911 A CN 103940911A
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China
Prior art keywords
anchor
draw
hoist cable
signal
ultrasound wave
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CN201410182969.5A
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刘志平
戢欧阳
刘兴乐
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Wuhan University of Technology WUT
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Wuhan University of Technology WUT
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Priority to CN201410182969.5A priority Critical patent/CN103940911A/en
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Abstract

The invention discloses detection device and method for a service bridge inhaul cable/suspension cable anchor system. The device comprises a detection circuit which is mainly formed by an ultrasonic generation and excitation part, a piezoelectric transducer (6) and a signal collector (7), and a detection mechanism which is mainly formed by a first clamp for fixing an inhaul cable/suspension cable of an anchor system, a second clamp for connecting a transmitting probe and the piezoelectric transducer with the anchor system through a coupling agent (2), and a PC machine. The method comprises the steps as follows: a transmitter obtains working voltage from alternating current through an adjustable transformer and a direct-current rectifier module; the transmitting probe generates an ultrasonic wave under excitation of the voltage, and is introduced into the inhaul cable/suspension cable in an anchor area through the coupling agent; the piezoelectric transducer transforms an ultrasonic wave reflected by the anchor area into a corresponding electric signal; the electric signal is processed and analyzed in the PC machine, so as to obtain defect information of the anchor system. The detection device and method have the advantages of being good in stability, high in detection sensitivity, low in cost, convenient to use and the like.

Description

A kind of pick-up unit and method of draw/hoist cable of the bridge of being on active service anchor system
Technical field
The invention belongs to draw/hoist cable of military service bridge anchor system field of non destructive testing, relate in particular to a kind of pick-up unit and method based on hyperacoustic draw/hoist cable of military service bridge anchor system.
Background technology
The suspension bridge of building in the recent period adopts prestress anchoraging system mostly, and prestress anchoraging system is made up of prestress and strand web member, and main cable strand is connected power is passed to anchor block with presstressed reinforcing steel by web member.The material of draw/hoist cable of bridge generally adopts high strength cast iron, steel wire or steel strand wires.Conventional cable body is parallel steel stranded wire rope and parallel hawser both at home and abroad at present.Draw/hoist cable anchor system common deficiency shows as burn into crackle, fracture of wire etc., and major defect is corrosion, and it is the reduction of draw/hoist cable of impact drag directly.In prestressed structure, the anticorrosion and endurance issues of material is to receive much concern and stubborn problem always.In prestressed structure, because corroding, prestressed material cause the example of structural damage a lot of both at home and abroad, as: sea, nineteen ninety-five Guangzhou prints No. 9 Cable failure accidents that bridge occurs, the bridge Yin Lasuo corrosion of south gate, calendar year 2001 Yibin collapses, Chongqing Shimen Bridge in 2005 has a strong impact on bridge security because corrosion occurs cable systems, U.S.'s Mississipi bridge in 2007 event of caving in.
Anchor system is detected; first need the protection system that checks anchor system whether to be destroyed; in the situation that protection system is destroyed; need to detect the affected degree of anchor system; ground tackle is responsive especially position, and etchant gas, ponding and pollutant can accumulate in here conventionally, makes being worse off here; drag-line also bears moment of flexure and other effects, so drag-line usually here damages.And the singularity of ground tackle structure, conventional method often cannot be touched, mostly adopt loseless method to detect, the Method and kit at present anchor-hold system being detected is very limited, radial imaging method is for ray and the safety assurance of enough energy are provided, but pick-up unit itself is heavier, and rope anchorage zone surrounding space is often limited, and also difficult explanation of ray image, the result of experiment can not ensure the accuracy of field test.
Summary of the invention
Technical matters to be solved by this invention is: for solving limited, the problem such as accuracy is not high of existing drawing/hoist cable anchor system lossless detection method and device, and defect in existing detection technique, pick-up unit and the method for a kind of good stability, penetration capacity is strong, defect location is accurate, detection sensitivity is high, cost is low, easy to use, speed is fast, harmless draw/hoist cable of military service bridge anchor system are provided.
The technical solution adopted for the present invention to solve the technical problems is:
The present invention is to provide a kind of pick-up unit based on hyperacoustic draw/hoist cable of military service bridge anchor system, this device comprises: the testing circuit mainly being formed by ultrasound wave generation and driver unit, piezoelectric transducer and signal sampler, and main by be used for fixing anchor system draw/hoist cable the first fixture, for getting rid of the couplant of air between the transmitting probe of ultrasonic exciting part and surface of the work, the second fixture that transmitting probe is connected with one end of anchor system by couplant with piezoelectric transducer, the testing agency that PC forms.
Described ultrasound wave produces and driver unit, is made up of transmitter and transmitting probe, and wherein the input end of transmitting probe is connected with transmitter.
Described piezoelectric transducer is fixed on anchor cable end face by magnetic mode, and it is connected with signal sampler by data line.
Described signal sampler, is connected with PC by data line.
Described ultrasound wave produces with driver unit and comprises transmitter and transmitting probe, and transmitter, for alternating current is obtained to operating voltage by transformation and direct current rectification, produces pulse excitation; Transmitting probe produces ultrasound wave by magnetostriction principle.
Described signal acquisition module, under the synchronous mode triggering of transmitter, adopts single channel collection, many times of amplifications, low-pass filtering; The signal of analysis module after to bandpass filtering treatment carries out waveform and phase analysis.
The present invention also provides a kind of detection method based on hyperacoustic draw/hoist cable of military service bridge anchor system, specifically: transmitter obtains operating voltage by alternating current by transtat and direct current rectification module, transmitting probe produces ultrasound wave under the excitation of voltage, import draw/hoist cable anchorage zone through couplant, the ultrasound wave of anchorage zone reflection is changed into corresponding electric signal by piezoelectric transducer, through signal sampler collection, in PC, electric signal is processed, analyzed, obtain the defect information of anchor system.
The detection method of above-mentioned draw/hoist cable of military service bridge anchor system provided by the invention, it comprises the following steps:
(1) piezoelectric effect:
In the time thering is the monocrystal material of asymmetric property structure and be subject to applied stress effect and produce strain, it is electroneutral state that the deformation variation of its internal crystal framework structure can destroy original macro manifestations, produce polarized electric field, the electric field intensity producing is directly proportional to the size of strain, and this phenomenon is called direct piezo electric effect; Turn device in the time receiving ultrasound wave when piezoelectricity changes, direct piezo electric effect occurs acoustic energy is converted to electric energy;
(2) damage of draw/hoist cable of anchorage zone location:
Transmitting probe and piezoelectric transducer are fixed on same one end of anchor system with fixture, transmitting probe, under the excitation of voltage, produces ultrasound wave by magnetostrictive effect, import draw/hoist cable of anchorage zone through couplant, and ultrasound wave is propagated along drag-line; It is that the ultrasound wave that the faying face of the two media that acoustic impedance is different reflects changes into corresponding electric signal that piezoelectric transducer receives from interface, and the velocity of propagation of this signal in draw/hoist cable is certain, determines defective locations, that is: by following proportionate relationship
L 1 L 2 = T 1 T 2
In formula: L 1for draw/hoist cable of anchor system long; T 1for signal is from the echo time of end face first reflection; L 2for the length of defect range transmission end; T 2for the echo time of fault location reflection;
(3) utilize ultrasound wave to determine different defect types in amplitude and the SPA sudden phase anomalies of fault location:
1) characterize sound wave through energy attenuation level index after draw/hoist cable based on receiving wave amplitude, in the time that ultrasound wave arrives fracture of wire defect interface, can produce absorption and scattering, reflection, decay increases, piezoelectric transducer receives the abnormal principle of wave amplitude, by contrasting the wave amplitude state of harmless draw/hoist cable, determine that amplitude sudden change place is fracture of wire defect;
2) based on each phase place composition in ultrasound wave in wear-out defect interface attenuation degree difference, in test, piezoelectric transducer is accepted ultrasonic signal, through Acquisition Instrument collection, utilize MATLAB to carry out phase analysis to signal, according to the abnormal principle of phase of received signal, determine that SPA sudden phase anomalies place is wear-out defect, the length of SPA sudden phase anomalies and cross section loss are proportional.
The present invention compared with prior art has advantages of following main:
1. the present invention is based on the principle of ultrasound examination, for the Non-Destructive Testing of draw/hoist cable of bridge anchor system provides a kind of novel method, and verified by experiment its validity.
2. a kind of pick-up unit based on hyperacoustic draw/hoist cable of military service bridge anchor system disclosed by the invention, simple in structure, can the in the situation that of the limited space of draw/hoist cable anchorage zone, complete Detection task.
3. a kind of pick-up unit based on hyperacoustic draw/hoist cable of military service bridge anchor system disclosed by the invention, simple to operate, transmitting probe and piezoelectric transducer all adopt vaseline coupling, fixture to fix, and verify by experiment validity and the repeatability of this fixed coupling mode.
4. a kind of detection method based on hyperacoustic draw/hoist cable of military service bridge anchor system disclosed by the invention, stability is strong, and result is accurate.
The anchor cable of 5m length is carried out to artificial system and damage, defect (fracture of wire, wearing and tearing) position, at 2.5m place, adopts the fixed coupling mode of the present invention's proposition and based on hyperacoustic pick-up unit, sample is detected, and experimental data is as follows:
1. the testing result of fracture of wire (2) anchor cable is as shown in Figure 3, abnormal suddenly than harmless anchor cable fracture of wire place amplitude, and the position consistency of position and artificial system damage, and repeatedly, result registration is high for revision test.
The testing result of 2. wearing and tearing (cross section loss 20%, 30%) anchor cable as shown in Figure 4 and Figure 5, there is sudden change in the phase place of fray, cross section loss is proportional with the length of SPA sudden phase anomalies, and the position consistency of position and artificial system damage, repeatedly, result registration is high for revision test.Middle vertical line in Fig. 4 and Fig. 5 represents abration position.
Brief description of the drawings
Fig. 1 is the block diagram of testing circuit of the present invention.
The concrete structure schematic diagram of Tu2Shi testing agency of the present invention.
Fig. 3 is the amplitude figure of 2 fracture of wire anchor cable sample testing results of the present invention.
Fig. 4 is wear and tear amplitude figure and the phase diagram of 20% anchor cable sample testing result of cross section of the present invention.
Fig. 5 is wear and tear amplitude figure and the phase diagram of 30% anchor cable sample testing result of cross section of the present invention.
In figure: 1. the first fixture; 2. couplant; 3. the second fixture; 4. transmitting probe; 5. transmitter; 6. piezoelectric transducer; 7. signal sampler; 8.PC machine; 9. draw/hoist cable; 10. draw/hoist cable anchor system.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearer, below in conjunction with embodiment and accompanying drawing, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Pick-up unit based on hyperacoustic draw/hoist cable of military service bridge anchor system provided by the invention, its structure as depicted in figs. 1 and 2, comprises testing circuit and testing agency.
Testing circuit of the present invention, its structure as shown in Figure 1, is mainly made up of ultrasound wave generation and driver unit, piezoelectric transducer 6 and signal sampler 7.
Described ultrasound wave produces and driver unit, comprises transmitter 5 and transmitting probe 4, and the input end of transmitting probe 4 is connected with transmitter 5.Transmitter 5, obtains 12V operating voltage by 220V alternating current by transtat and direct current rectification module, and the operating voltage of power amplifier is provided, and signal generator produces pulse signal and produce suitable driving voltage after power amplifier amplifies.Transmitting probe 4 produces ultrasound wave under the excitation of operating voltage, that is: under the effect of driving voltage, the telescopic variation that length occurs ferrimagnet in alternating magnetic field produces ultrasound wave, imports draw/hoist cable anchorage zone through couplant;
Described piezoelectric transducer 6 is fixed on anchor cable end face by magnetic mode, it converts the ultrasonic signal reflecting to electric signal, specifically the ultrasound wave of anchorage zone reflection is changed into the electric signal that can carry out analyzing and processing by the piezoelectric effect of piezoelectric crystal, electric signal process is processed, analyzed, obtain the defect information of anchor system, then output to PC 8 by data line.This piezoelectric transducer should select electro-acoustic conversion efficiency high, the particularly high piezoelectric transducer of receiving sensitivity, the YTH series ultrasonic transducer that for example adopts Baoding E-TEN Corp science and technology to produce.
Described signal sampler 7, is connected with the output terminal of piezoelectric transducer 6 by data line.In this signal sampler, there are signal acquisition module and analysis module, also carry out in time data analysis for signals collecting, wherein: signal acquisition module, under the synchronous mode triggering of transmitter, adopts single channel collection, many times of amplifications, low-pass filtering; The signal of analysis module after to bandpass filtering treatment carries out waveform and phase analysis, the UT34 series Acquisition Instrument that for example adopts the excellent safe electronics in Wuhan to produce.
Testing agency of the present invention, its structure as shown in Figure 2, is mainly made up of the first fixture 1, couplant 2, the second fixture 3, PC 8, wherein: the first fixture 1, is used for fixing the draw/hoist cable of anchor system.Couplant 2, Main Function is mainly the air of getting rid of between transmitting probe 4 and surface of the work, ultrasonic wave energy is effectively imported into and spread out of workpiece, to detect, also be conducive to reduce the friction of transmitting probe 4 and surface of the work, extend the serviceable life of this probe simultaneously.The second fixture 3, for fixed transmission probe and piezoelectric transducer, specifically this fixture is connected transmitting probe 4 by couplant 2 with piezoelectric transducer 6 with one end of anchor system.PC 8, obtains testing result for signal being carried out to the processing such as waveform and phase analysis.
Pick-up unit based on hyperacoustic draw/hoist cable of military service bridge anchor system provided by the invention, its principle of work is: transmitter by alternating current obtain operating voltage by transtat and direct current rectification module, transmitting probe produces ultrasound wave under the excitation of voltage, import draw/hoist cable anchorage zone through couplant, the ultrasound wave of anchorage zone reflection is changed into corresponding electric signal by piezoelectric transducer, in PC, electric signal process is processed, analyzed, obtain the defect information of anchor system.
Detection method based on hyperacoustic draw/hoist cable of military service bridge anchor system provided by the invention, specifically: transmitter obtains operating voltage by alternating current by transtat and direct current rectification module, transmitting probe produces ultrasound wave under the excitation of voltage, import draw/hoist cable anchorage zone through couplant, the ultrasound wave of anchorage zone reflection is changed into corresponding electric signal by piezoelectric transducer, in PC, electric signal process is processed, analyzed, obtain the defect information of anchor system.
Referring to Fig. 2, the method comprises the following steps:
(1) piezoelectric effect:
The structure of some monocrystal material has asymmetric property, in the time that these materials are subject to applied stress effect and produce strain, it is electroneutral state that the variation (deformation) of its internal crystal framework structure can destroy original macro manifestations, produce polarized electric field (electric polarization), the electric field (electric polarization) producing is directly proportional to the size of strain, and this phenomenon is called direct piezo electric effect; Piezoelectricity in the present invention changes and turns device in the time receiving ultrasound wave, occur direct piezo electric effect acoustic energy is converted to electric energy, then by this electrical signal transfer to signal collection and analysis part.
(2) damage of draw/hoist cable of anchorage zone location:
Transmitting probe and piezoelectric transducer are fixed on same one end of anchor system with fixture, transmitting probe, under the excitation of voltage, produces ultrasound wave by magnetostrictive effect, import draw/hoist cable of anchorage zone through couplant, and ultrasound wave is propagated along drag-line; Piezoelectric transducer receives from interface the ultrasound wave that (faying face of the two media that acoustic impedance is different) reflect and changes into corresponding electric signal, the velocity of propagation of ultrasonic signal in draw/hoist cable is certain, determine defective locations by following proportionate relationship, that is:
L 1 L 2 = T 1 T 2
L in formula 1for draw/hoist cable of anchor system long;
T 1for signal is from the echo time of end face first reflection;
L 2for the length of defect range transmission end;
T 2for the echo time of fault location reflection.
(3) utilize ultrasound wave to determine different defect types in amplitude and the SPA sudden phase anomalies of fault location:
1. receive wave amplitude and characterize sound wave through energy attenuation level index after draw/hoist cable, in the time that ultrasound wave arrives fracture of wire defect interface, can produce absorption and scattering, reflection, decay increases, and it is abnormal that piezoelectric transducer receives wave amplitude.Therefore,, by contrasting the wave amplitude state of harmless draw/hoist cable, can determine that amplitude sudden change place is fracture of wire defect.
2. in ultrasound wave, each phase place composition is in wear-out defect interface attenuation degree difference, and in test, piezoelectric transducer is accepted ultrasonic signal, through Acquisition Instrument collection, utilizes MATLAB to carry out phase analysis to signal.By phase analysis, can determine that SPA sudden phase anomalies place is wear-out defect, the length of SPA sudden phase anomalies and cross section loss are proportional.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection domain of claims of the present invention.

Claims (8)

1. the pick-up unit of draw/hoist cable of the bridge of a being on active service anchor system, it is characterized in that a kind of pick-up unit based on hyperacoustic draw/hoist cable of military service bridge anchor system, this device comprises: mainly produced and driver unit by ultrasound wave, the testing circuit of piezoelectric transducer (6) and signal sampler (7) composition, and mainly by first fixture (1) of draw/hoist cable that is used for fixing anchor system, for getting rid of the couplant (2) of air between the transmitting probe (4) of ultrasonic exciting part and surface of the work, the second fixture (3) that transmitting probe (4) is connected with one end of anchor system by couplant (2) with piezoelectric transducer (6), the testing agency of PC (8) composition.
2. pick-up unit according to claim 1, it is characterized in that described ultrasound wave produces and driver unit, be made up of transmitter (5) and transmitting probe (4), wherein the input end of transmitting probe (4) is connected with transmitter (5).
3. pick-up unit according to claim 1, is characterized in that described piezoelectric transducer (6) is fixed on anchor cable end face by magnetic mode, and it is connected with signal sampler (7) by data line.
4. pick-up unit according to claim 1, is characterized in that described signal sampler (7), is connected with PC (8) by data line.
5. pick-up unit according to claim 1, is characterized in that described ultrasound wave produces and driver unit comprises transmitter and transmitting probe, and transmitter, for alternating current is obtained to operating voltage by transformation and direct current rectification, produces pulse excitation; Transmitting probe produces ultrasound wave by magnetostriction principle.
6. pick-up unit according to claim 1, is characterized in that described signal acquisition module, under the synchronous mode triggering of transmitter, adopts single channel collection, many times of amplifications, low-pass filtering; The signal of analysis module after to bandpass filtering treatment carries out waveform and phase analysis.
7. the detection method of draw/hoist cable of the bridge of a being on active service anchor system, it is characterized in that a kind of detection method based on hyperacoustic draw/hoist cable of military service bridge anchor system, specifically: transmitter obtains operating voltage by alternating current by transtat and direct current rectification module, transmitting probe produces ultrasound wave under the excitation of voltage, import draw/hoist cable anchorage zone through couplant, the ultrasound wave of anchorage zone reflection is changed into corresponding electric signal by piezoelectric transducer, through signal sampler collection, in PC, electric signal is processed, analyzed, obtain the defect information of anchor system.
8. detection method according to claim 5, is characterized in that comprising the following steps:
(1) piezoelectric effect:
In the time thering is the monocrystal material of asymmetric property structure and be subject to applied stress effect and produce strain, it is electroneutral state that the deformation variation of its internal crystal framework structure can destroy original macro manifestations, produce polarized electric field, the electric field intensity producing is directly proportional to the size of strain, and this phenomenon is called direct piezo electric effect; Turn device in the time receiving ultrasound wave when piezoelectricity changes, direct piezo electric effect occurs acoustic energy is converted to electric energy;
(2) damage of draw/hoist cable of anchorage zone location:
Transmitting probe and piezoelectric transducer are fixed on same one end of anchor system with fixture, transmitting probe, under the excitation of voltage, produces ultrasound wave by magnetostrictive effect, import draw/hoist cable of anchorage zone through couplant, and ultrasound wave is propagated along drag-line; It is that the ultrasound wave that the faying face of the two media that acoustic impedance is different reflects changes into corresponding electric signal that piezoelectric transducer receives from interface, and the velocity of propagation of this signal in draw/hoist cable is certain, determines defective locations, that is: by following proportionate relationship
L 1 L 2 = T 1 T 2
In formula: L 1for draw/hoist cable of anchor system long; T 1for signal is from the echo time of end face first reflection; L 2for the length of defect range transmission end; T 2for the echo time of fault location reflection;
(3) utilize ultrasound wave to determine different defect types in amplitude and the SPA sudden phase anomalies of fault location:
1) characterize sound wave through energy attenuation level index after draw/hoist cable based on receiving wave amplitude, in the time that ultrasound wave arrives fracture of wire defect interface, can produce absorption and scattering, reflection, decay increases, piezoelectric transducer receives the abnormal principle of wave amplitude, by contrasting the wave amplitude state of harmless draw/hoist cable, determine that amplitude sudden change place is fracture of wire defect;
2) based on each phase place composition in ultrasound wave in wear-out defect interface attenuation degree difference, in test, piezoelectric transducer is accepted ultrasonic signal, through Acquisition Instrument collection, utilize MATLAB to carry out phase analysis to signal, according to the abnormal principle of phase of received signal, determine that SPA sudden phase anomalies place is wear-out defect, the length of SPA sudden phase anomalies and cross section loss are proportional.
CN201410182969.5A 2014-04-30 2014-04-30 Detection device and method for service bridge inhaul cable/suspension cable anchor system Pending CN103940911A (en)

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CN109915738A (en) * 2019-03-21 2019-06-21 清华大学合肥公共安全研究院 A kind of pipe ultrasonic wave attenuation detection system and method

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CN109187752A (en) * 2018-10-11 2019-01-11 哈尔滨工业大学(深圳) Detect the magnetostrictive guided-wave sensor and its detection method of elevator traction steel band
CN109915738A (en) * 2019-03-21 2019-06-21 清华大学合肥公共安全研究院 A kind of pipe ultrasonic wave attenuation detection system and method
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Application publication date: 20140723

RJ01 Rejection of invention patent application after publication