CN101458232A - Anchor rod anchoring quality detecting instrument - Google Patents
Anchor rod anchoring quality detecting instrument Download PDFInfo
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- CN101458232A CN101458232A CNA2009100007866A CN200910000786A CN101458232A CN 101458232 A CN101458232 A CN 101458232A CN A2009100007866 A CNA2009100007866 A CN A2009100007866A CN 200910000786 A CN200910000786 A CN 200910000786A CN 101458232 A CN101458232 A CN 101458232A
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Abstract
The invention relates to an anchor rod anchoring quality detector, and belongs to the non-destructive test technical field. The detector comprises a central control module, a guided wave excitation module, a power amplification module, a channel switching module, a signal conditioning module, a data acquisition module, a user interaction module, a rechargeable battery module, a power adapter and a guided wave transceiving transducer. The detector adopts high-frequency and low-frequency guided wave dual-mode detection, and can comprehensively evaluate the anchor rod anchoring quality. The detector has simple operation, can display detection results in real time, can be manufactured into a plurality of modes such as a portable type, a vehicle-borne type, a stationary type and the like, and facilitates working personnel to be capable of rapidly detecting the anchor rod anchoring quality in practical engineering.
Description
Technical field
The present invention relates to a kind of anchor rod anchoring quality detecting instrument, the method that this instrument utilizes the low-and high-frequency guided wave to combine is carried out Non-Destructive Testing to anchor rod anchored quality, can on-the-spot detect the length of anchor pole, effective anchorage length, anchor force, anchor rod anchored quality is carried out comprehensive evaluation, be applicable to the anchor rod anchored quality testing in all kinds of Geotechnical Engineerings such as coal mine roadway, subterranean tunnel, belong to the Non-Destructive Testing field.
Background technology
Anchor pole is widely used in the reinforcing and supporting of underground passage and side slope country rock as an important component part of support system.In engineering reality, the fine or not direct relation of the anchoring quality of anchor pole the safety of engineering project, and in a single day anchor pole lost efficacy, and can produce grave danger to the stability of Geotechnical Engineering, even cause catastrophic consequence.
Cause that the main cause that anchor pole lost efficacy has: 1, anchor rod anchored curtailment does not reach designing requirement; 2,, cause the anchoring agent and the body of rod and country rock to fail effective adhesive because construction wrong; 3, after date when anchor pole is installed a section, the impact that causes because of geologic condition variation or explosion, heavy-duty machinery and seismic force makes the anchor pole part be in the stress collected state, causes anchor pole to be broken; 4, because the horizontal slip of country rock makes the stress state of anchor pole become horizontal shear stress by axial tension stress, cause anchor pole to be cut off; 5, because the residing environment of anchor pole is abominable, be subjected to humid air, phreatic infiltration, make anchoring medium progressively aging, cause anchor pole to lose efficacy.At present, anchor rod anchored technology has been widely used in all kinds of Geotechnical Engineerings, in order to spur domestic demand, China will drop into 4 trillion yuan funds and carry out the construction of various infrastructure before 2010, in order to ensure the safety of Geotechnical Engineering project, anchor rod anchored quality is carried out Non-Destructive Testing have great importance.
At present, in engineering reality, generally adopt the pull-out test method to detect anchor rod anchored quality.The pull-out test method adopts the jack pair anchor pole to carry out pull-out test, whether reach design load with anchor force and estimate anchor rod anchored quality, its shortcoming is that anchor pole is carried out pull-out test can make the anchor force of anchor pole lose, therefore can only carry out a spot of sampling Detection to anchor pole, can't fully understand the anchoring quality of anchor pole in the engineering, carry out also more consuming time, the effort of pull-out test.For anchoring quality anchoring body preferably, its intensity is much larger than the intensity of anchor pole itself, and therefore before measuring the limit anchoring force of anchor pole, anchor rod body is broken, so itself there is certain limitation in this method of testing of pull-out test method.In addition, the pull-out test method can only obtain the anchor force of anchor pole, can't detect for rock-bolt length, anchor rod anchored section the important indicator of the anchor rod anchored quality of sign such as length.The anchor rod anchored method for quality of another kind of check is the coring method, takes out along steering handle anchor pole, anchoring medium and the part rock integral body of parallel anchor pole with core drill, with the method for range estimation anchoring quality is estimated.Though coring can provide very Useful Information, it is not only a destructive detection means, and is subjected to the restriction of many factors and can't becomes the detection means of a routine.These two kinds of methods all are destructive detection methods.
Summary of the invention
The objective of the invention is to propose a kind of anchor rod anchoring quality detecting instrument for solving anchor rod anchored quality testing problem.This instrument adopts high and low frequency guided wave that anchor rod anchored quality is carried out the Intelligent Measurement of comprehensive detection, can detect the length of anchor pole, effectively anchorage length and anchor force at engineering site, and anchor rod anchored quality is carried out comprehensive evaluation.
This detector comprises central control module, guided wave excitation module, power amplifier module, channel switching module, signal condition module, data acquisition module, user interactive module, charging cell module, power supply adaptor and guided wave sending and receiving sensor.
Wherein, central control module is made up of the storer of flush bonding processor and band power-off protection.Operation thereon has embedded OS and anchor rod anchored quality testing analysis and processing program.Central control module is responsible for the operation of control detection instrument, and testing result is analyzed and estimated.
The guided wave excitation module is responsible for frequency, voltage, the cycle according to the central control module setting, generates corresponding guided wave pumping signal.
The gain that power amplifier module is set according to central control module is carried out power amplification with the guided wave pumping signal that the guided wave excitation module generates.
Channel switching module is subjected to the control of central control module, when carrying out the test of high frequency guided wave, when the guided wave excitation module excites guided wave, power amplifier module and guided wave sending and receiving sensor, signal condition module is connected; When receiving echoed signal, rupturing duty amplification module path is connected guided wave sending and receiving sensor and signal condition module.When carrying out the low-frequency guided wave test, guided wave sending and receiving sensor and signal condition module are connected.
The signal condition module will be carried out amplitude limit, filtering and amplification through the guided wave pumping signal that channel switching module sends by the guided wave sending and receiving sensor under the control of central control module.
Data acquisition module carries out analog to digital conversion to the signal after the signal condition resume module under the control of central control module, gather echoed signal.
User interactive module has liquid crystal panel and graphical operation interface, is responsible for providing the input and output interactive interface, and the user imports detected parameters by this module, and by this module detector is operated.In addition, this module also provides network interface and USB standard interface, makes detector carry out communication with network or other peripheral hardwares.
Charging cell module is the whole instrument power supply.
Power supply adaptor is the rechargeable battery charging.
The guided wave sending and receiving sensor comprises high frequency probe and low-frequency probe, respectively at the anchor pole underexcitation, receive the high and low frequency guided wave signals.
The annexation of each ingredient is:
Central control module links to each other with guided wave excitation module, power amplifier module, channel switching module, signal condition module, data acquisition module, user interactive module, charging cell module.
The guided wave excitation module links to each other with central control module, power amplifier module, charging cell module.
Power amplifier module links to each other with central control module, guided wave excitation module, channel switching module, charging cell module.
Channel switching module links to each other with central control module, power amplifier module, guided wave sending and receiving sensor, signal condition module, charging cell module.
The signal condition module links to each other with central control module, channel switching module, data acquisition module, charging cell module.
Data acquisition module links to each other with central control module, signal condition module, charging cell module.
User interactive module links to each other with central control module, charging cell module.
Charging cell module links to each other with central control module, guided wave excitation module, power amplifier module, channel switching module, signal condition module, data acquisition module, user interactive module, power supply adaptor.
The concrete course of work of this detector is:
At first, the start detection instrument is the detector power supply by charging cell module;
Afterwards, carrying out detected parameters sets.According to field condition, set the test material parameter by user interactive module.
Then, carry out the guided wave test.When carrying out the test of high frequency guided wave, guided wave sending and receiving sensor high frequency probe is placed the anchor pole end, detector is set to high frequency guided wave detecting pattern, and central control module is provided with the shooting parameter of guided wave excitation module high frequency guided wave, the signal gain of power amplifier module, the filtering and the amplifying parameters of signal condition module automatically according to the test material parameter of input.Under the control of central control module, generate the guided wave pumping signal by the guided wave excitation module, through power amplifier module signal is amplified, export signal to the guided wave sending and receiving sensor through channel switching module again, in anchor pole, excite guided wave.Afterwards, by central control module control channel handover module, the echoed signal that guided wave sending and receiving sensor high frequency probe is sensed switches to the signal condition module and carries out Signal Pretreatment, to carry out analog to digital conversion through pretreated signal by data acquisition module then, and store in the storer of central control module.
When carrying out the low-frequency guided wave test, guided wave sending and receiving sensor low-frequency probe is placed the anchor pole end, detector is set to the low-frequency guided wave detecting pattern, central control module sets the filtering and the amplifying parameters of low frequency signal condition module when detecting, and channel switching module is set makes guided wave sending and receiving sensor low-frequency probe and the connection of signal condition module.In anchor pole, excite the low-frequency guided wave signal by guided wave sending and receiving sensor low-frequency probe, the signal that guided wave sending and receiving sensor low-frequency probe is sensed carries out Signal Pretreatment through the signal condition module, to carry out analog to digital conversion through pretreated signal by data acquisition module then, and store in the storer of central control module.
At last, testing result is carried out analyzing and processing.Detect data according to high frequency that obtains and low-frequency guided wave, by central control module, calculate the effective anchorage length of length, anchor pole and the anchor force of anchor pole, and provide the testing result of anchor rod anchored quality, be shown to the user by user interactive module.
This detector can be designed to the portable integrated small instrument that can work independently as required, also can be designed to adopt vehicular or fixed instrument etc., to satisfy the different needs of practical engineering application.
Beneficial effect
The anchor rod anchoring quality detecting instrument that the present invention proposes adopts high frequency and low-frequency guided wave dual-mode detection, can carry out thoroughly evaluating to anchor rod anchored quality.Employing can not damage anchor pole in the mode that termination point of anchor rod excitation guided wave detects anchor rod anchored quality.This detector is simple to operate, can show testing result in real time, can be made into portable, vehicular or multiple mode such as fixed, makes the staff carry out fast detecting to anchor rod anchored quality in actual engineering.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is provided with synoptic diagram for the material parameter of embodiment of the present invention;
Fig. 3 is provided with synoptic diagram for high frequency guided wave parameter;
Fig. 4 is anchor pole high frequency guided wave test waveform figure;
Fig. 5 is anchor pole low-frequency guided wave test waveform figure;
Fig. 6 is the comprehensive evaluation result of anchor rod anchored quality.
Embodiment
Below in conjunction with drawings and Examples embodiments of the present invention are described in further details.
Anchor rod anchoring quality detecting instrument structure of the present invention is formed as shown in Figure 1, adopt the portable integrated small design that can work independently, comprise central control module, guided wave excitation module, power amplifier module, channel switching module, signal condition module, data acquisition module, user interactive module, charging cell module, power supply adaptor and guided wave sending and receiving sensor.
Wherein, central control module links to each other with guided wave excitation module, power amplifier module, channel switching module, signal condition module, data acquisition module, user interactive module, charging cell module.
The guided wave excitation module links to each other with central control module, power amplifier module, charging cell module.
Power amplifier module links to each other with central control module, guided wave excitation module, channel switching module, charging cell module.
Channel switching module links to each other with central control module, power amplifier module, guided wave sending and receiving sensor, signal condition module, charging cell module.
The signal condition module links to each other with central control module, channel switching module, data acquisition module, charging cell module.
Data acquisition module links to each other with central control module, signal condition module, charging cell module.
User interactive module links to each other with central control module, charging cell module.
Charging cell module links to each other with central control module, guided wave excitation module, power amplifier module, channel switching module, signal condition module, data acquisition module, user interactive module, power supply adaptor.
The concrete course of work is as follows:
Suppose to be 2.1m to length, diameter is that the anchor pole of 22mm carries out the anchoring quality detection.Wherein, the anchor pole elastic modulus is 210GPa, and density is 7850kg/m
3, anchoring medium is a resin, and elastic modulus is 20GPa, and density is 2200kg/m
3, the resin anchoring agent length that adopts when anchor pole is installed is 500mm.
At first, the start detection instrument is the detector power supply by charging cell module;
Afterwards, according to field condition, set material parameter by user interactive module.The material parameter setting as shown in Figure 2.
Then, carry out the guided wave test.When carrying out the test of high frequency guided wave, guided wave sending and receiving sensor high frequency probe is placed the anchor pole end, detector is set to high frequency guided wave detecting pattern, central control module is provided with the parameter of guided wave excitation module high frequency guided wave and the signal gain of power amplifier module, and the setting of high frequency guided wave parameter as shown in Figure 3.Simultaneously, central control module signal condition module is set to high-pass filtering.Under the control of central control module, generate the guided wave pumping signal by the guided wave excitation module, through power amplifier module signal is amplified, export signal to the guided wave sending and receiving sensor through channel switching module again, in anchor pole, excite guided wave.Afterwards, by central control module control channel handover module, the echoed signal that guided wave sending and receiving sensor high frequency probe is sensed switches to the signal condition module and carries out Signal Pretreatment, to carry out analog to digital conversion through pretreated signal by data acquisition module then, and store in the storer of central control module.Anchor pole high frequency guided wave test waveform as shown in Figure 4.
When carrying out the low-frequency guided wave test, guided wave sending and receiving sensor low-frequency probe is placed the anchor pole end, detector is set to the low-frequency guided wave detecting pattern.Central control module signal condition module is set to low-pass filtering, and channel switching module is set guided wave sending and receiving sensor low-frequency probe and signal condition module are connected.In anchor pole, excite the low-frequency guided wave signal by guided wave sending and receiving sensor low-frequency probe.Afterwards, the signal that guided wave sending and receiving sensor low-frequency probe is sensed carries out Signal Pretreatment through the signal condition module, will carry out analog to digital conversion through pretreated signal by data acquisition module then, and store in the storer of central control module.Anchor pole low-frequency guided wave test waveform as shown in Figure 5.
At last, testing result is carried out analyzing and processing.Adopt effective anchorage length, fundamental frequency, frequency ratio, these 4 parameters of anchor force of anchor rod anchored system that anchor rod anchored quality is carried out comprehensive evaluation.Criterion is:
(1) effectively anchorage length is long more, and anchoring quality is good more.At first the energy velocity of measuring guided wave under anchor pole bottom first reflection echo time and this frequency with the high frequency guided wave obtains the length of anchor pole.Then, record the length that anchor rod anchored section energy velocity that goes up the guided wave under interface first reflection echo time and this frequency obtains free section anchor pole by low-frequency guided wave.At last, the length of length by anchor pole and free section anchor pole is obtained effective anchorage length of anchor pole.
In the present embodiment, the length of measuring anchor pole is 2.12m, and effectively anchorage length is 0.43m.
(2) under the identical situation of anchoring parameter, free segment length is short more, and effectively anchorage length is long more, and fundamental frequency is high more, and anchoring quality is good more.Otherwise then anchoring quality is poor more.
In the present embodiment, according to test data, the fundamental frequency that obtains the anchor pole echoed signal is 781.25Hz.
(3) frequency ratio: frequency is carried out nondimensionalization, promptly with the difference of each resonance frequency of anchor pole vibration and the anchoring quality of recently estimating anchor pole of fundamental frequency.The anchor pole that anchoring quality is bad, its frequency ratio are 1; The anchor pole that anchoring quality is excellent, its frequency ratio approaches 2.The anchor pole that anchoring quality is medium, its frequency ratio is between 1 and 2.
In the present embodiment, according to test data, obtaining frequency ratio is 1.95.
(4) anchor force: the anchor-holding force of anchor bolt computing formula is:
P＝πdlτ
Wherein, P is an anchor force, and d is a body of rod diameter, and l is effective anchorage length, and τ is a cohesive strength.
In the present embodiment, the anchor force of calculating anchor pole is 12 tons.
According to the test data of high frequency and low-frequency guided wave, calculate effective anchorage length, fundamental frequency, the frequency ratio of anchor pole, the anchoring quality that provides this anchor pole is evaluated as excellent.
Anchor rod anchored quality testing result is shown to the user by user interactive module.The comprehensive evaluation result of the anchor rod anchored quality of present embodiment as shown in Figure 6.
Claims (4)
1, a kind of anchor rod anchoring quality detecting instrument is characterized in that comprising central control module, guided wave excitation module, power amplifier module, channel switching module, signal condition module, data acquisition module, user interactive module, charging cell module, power supply adaptor, guided wave sending and receiving sensor;
Wherein, central control module is made up of the storer of flush bonding processor and band power-off protection, and operation thereon has embedded OS and anchor rod anchored quality testing analysis and processing program; Central control module is responsible for the operation of control detection instrument, and testing result is analyzed and estimated;
Frequency, voltage, cycle that the guided wave excitation module is set according to central control module, generate corresponding guided wave pumping signal;
The gain that power amplifier module is set according to central control module, the signal that the guided wave excitation module is generated carries out power amplification;
Channel switching module when carrying out the test of high frequency guided wave, when the guided wave excitation module excites guided wave, is connected power amplifier module and guided wave sending and receiving sensor, signal condition module under the control of central control module; When receiving echoed signal, rupturing duty amplification module path is connected guided wave sending and receiving sensor and signal condition module; When carrying out the low-frequency guided wave test, guided wave sending and receiving sensor and signal condition module are connected;
The signal condition module will be carried out amplitude limit, filtering and amplification through the electric signal that channel switching module sends by the guided wave sending and receiving sensor under the control of central control module;
Data acquisition module carries out analog to digital conversion to the signal after the signal condition resume module under the control of central control module, gather echoed signal;
User interactive module provides the input and output interactive interface, and the user imports detected parameters by this module, and by this module detector is operated;
Charging cell module is the whole instrument power supply;
Power supply adaptor is the rechargeable battery charging;
The guided wave sending and receiving sensor comprises high frequency probe and low-frequency probe, respectively at anchor pole underexcitation, reception high and low frequency guided wave signals;
The annexation of each ingredient is:
Central control module links to each other with guided wave excitation module, power amplifier module, channel switching module, signal condition module, data acquisition module, user interactive module, charging cell module;
The guided wave excitation module links to each other with central control module, power amplifier module, charging cell module;
Power amplifier module links to each other with central control module, guided wave excitation module, channel switching module, charging cell module;
Channel switching module links to each other with central control module, power amplifier module, guided wave sending and receiving sensor, signal condition module, charging cell module;
The signal condition module links to each other with central control module, channel switching module, data acquisition module, charging cell module;
Data acquisition module links to each other with central control module, signal condition module, charging cell module;
User interactive module links to each other with central control module, charging cell module;
Charging cell module links to each other with central control module, guided wave excitation module, power amplifier module, channel switching module, signal condition module, data acquisition module, user interactive module, power supply adaptor.
2, a kind of anchor rod anchoring quality detecting instrument as claimed in claim 1 is characterized in that the course of work of detector is:
At first, the start detection instrument is the detector power supply by charging cell module;
Afterwards, according to field condition, set the test material parameter by user interactive module;
Then, carry out the guided wave test, when carrying out the test of high frequency guided wave, guided wave sending and receiving sensor high frequency probe is placed the anchor pole end, detector is set to high frequency guided wave detecting pattern, central control module is provided with the shooting parameter of guided wave excitation module high frequency guided wave automatically according to the test material parameter of input, the signal gain of power amplifier module, the filtering of signal condition module and amplifying parameters, under the control of central control module, generate the guided wave pumping signal by the guided wave excitation module, through power amplifier module signal is amplified, export signal to the guided wave sending and receiving sensor through channel switching module again, in anchor pole, excite guided wave, afterwards, by central control module control channel handover module, the echoed signal that guided wave sending and receiving sensor high frequency probe is sensed switches to the signal condition module and carries out Signal Pretreatment, will carry out analog to digital conversion through pretreated signal by data acquisition module then, and store in the storer of central control module;
When carrying out the low-frequency guided wave test, guided wave sending and receiving sensor low-frequency probe is placed the anchor pole end, detector is set to the low-frequency guided wave detecting pattern, central control module sets the filtering and the amplifying parameters of low frequency signal condition module when detecting, and channel switching module is set makes guided wave sending and receiving sensor low-frequency probe and the connection of signal condition module; In anchor pole, excite the low-frequency guided wave signal by guided wave sending and receiving sensor low-frequency probe, the signal that guided wave sending and receiving sensor low-frequency probe is sensed carries out Signal Pretreatment through the signal condition module, to carry out analog to digital conversion through pretreated signal by data acquisition module then, and store in the storer of central control module;
At last, testing result is carried out analyzing and processing, detect data according to high frequency that obtains and low-frequency guided wave, pass through central control module, calculate the effective anchorage length of length, anchor pole and the anchor force of anchor pole, and provide the testing result of anchor rod anchored quality, be shown to the user by user interactive module.
3, a kind of anchor rod anchoring quality detecting instrument as claimed in claim 1 is characterized in that:
The guided wave sending and receiving sensor comprises high frequency probe and low-frequency probe, respectively at anchor pole underexcitation, reception high and low frequency guided wave signals.
4, a kind of anchor rod anchoring quality detecting instrument as claimed in claim 1 is characterized in that:
User interactive module has liquid crystal panel and graphical operation interface, and has network interface and USB standard interface, can carry out communication with other peripheral hardware.
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| CN102175195A (en) * | 2011-03-16 | 2011-09-07 | 江苏中矿立兴能源科技有限公司 | Non-full-length bonding anchor length nondestructive testing method for coal mines |
| CN102207404A (en) * | 2011-03-16 | 2011-10-05 | 江苏中矿立兴能源科技有限公司 | Non-destructive testing method for natural frequency of transverse vibration of non-fully grouted anchoring bolt in coal mine |
| CN101706334B (en) * | 2009-11-20 | 2011-12-14 | 北京理工大学 | Method for performing non-destructive detection on service load of anchor bolt by using low-frequency guided wave |
| CN102520069A (en) * | 2011-12-29 | 2012-06-27 | 云南航天工程物探检测股份有限公司 | Coded signal detector and method for detecting stress wave generation and corrugated pipe grouting quality |
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| CN201141763Y (en) * | 2007-11-27 | 2008-10-29 | 西安理工大学 | Detection sensor for anchorage quality of anchor bar |
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| CN101706334B (en) * | 2009-11-20 | 2011-12-14 | 北京理工大学 | Method for performing non-destructive detection on service load of anchor bolt by using low-frequency guided wave |
| CN102175195A (en) * | 2011-03-16 | 2011-09-07 | 江苏中矿立兴能源科技有限公司 | Non-full-length bonding anchor length nondestructive testing method for coal mines |
| CN102207404A (en) * | 2011-03-16 | 2011-10-05 | 江苏中矿立兴能源科技有限公司 | Non-destructive testing method for natural frequency of transverse vibration of non-fully grouted anchoring bolt in coal mine |
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| CN104697683A (en) * | 2014-12-27 | 2015-06-10 | 陕西煤业化工技术研究院有限责任公司 | Dynamic disaster mine anchor rock stability integrated detection method and system |
| CN104697683B (en) * | 2014-12-27 | 2017-04-05 | 陕西煤业化工技术研究院有限责任公司 | Dynamic disaster mine anchor rock stability integrated testing method and system |
| CN104698083A (en) * | 2015-02-01 | 2015-06-10 | 山东科技大学 | Anchorage quality nondestructive testing method based on frequent micro technology |
| CN106053602A (en) * | 2016-05-04 | 2016-10-26 | 石家庄铁道大学 | A self-closed rock bolt nondestructive testing method based on a magnetostrictive effect |
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