CN104569159A - Accurate positioning method for concrete crack - Google Patents
Accurate positioning method for concrete crack Download PDFInfo
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- CN104569159A CN104569159A CN201310481241.8A CN201310481241A CN104569159A CN 104569159 A CN104569159 A CN 104569159A CN 201310481241 A CN201310481241 A CN 201310481241A CN 104569159 A CN104569159 A CN 104569159A
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Abstract
The invention relates to an accurate positioning method for a concrete crack. The method comprises the following steps: acoustic emission sensors (1) are packaged by epoxy resin, subjected to waterproofing work, buried in a concrete (2) structure as large aggregate, and connected with acoustic emission monitoring equipment (4) through coaxial screened cables (3); the acoustic emission monitoring equipment (4) is used for recording and analyzing acoustic emission source information, locates the position of a particular acoustic emission source (a crack) according to a received acoustic emission signal, and observes the developing and variation trend of the acoustic emission source (the crack); a cardinal point O is selected; the particular coordinate positions of the four acoustic emission sensors (1) are determined by taking the cardinal point O as datum; the acoustic emission sensors (1) are arranged in the concrete (2), and are led out to the acoustic emission monitoring equipment (4) through the coaxial screened cables (3) respectively. The accurate positioning method is accurate in positioning of a concrete crack, and reduces omissive and false positioning to the maximum extent.
Description
Technical field
The invention belongs to concrete monitoring technical field, a kind of distress in concrete is accurately located specifically
Method.
Background technology
Along with the continuous progress of operating technique and the use of new material, the Important Project such as giant-scale engineering, Super High extensively enters the sight line of people.How incident safety issue also more seriously, carries out in real time Important Project, on-line monitoring, and finding potential safety hazard early, is as much as possible racing against time of adopting an effective measure, and has become emphasis and the difficulties of current engineering circles.Concrete, as applications in civil engineering building materials the most widely, is furtherd investigate it, sets up concrete-damage Integrated Model, and to carrying out, engineering is real-time, on-line monitoring has important value.Xoncrete structure in use occurs that crack is a universal phenomenon, crack propagation is to certain width, the problems such as infiltration, steel bar corrosion will be caused, the globality of direct destruction xoncrete structure and security, have a strong impact on the use of engineering, so that have to adopt remedial measures, waste time and energy, costly.Timely seizure detects the crack of xoncrete structure, effectively must improve the forewarning function of safety monitoring system.
Acoustic emission is that material strain energy discharges and the instantaneous elasticity ripple produced fast.This elastic wave carries the sound source information in abundant material damage process, utilizes calibrate AE sensor to be received.Detected by instrument, record and analyze AE signal, and the technology of the several emissive source information of inverting is referred to as acoustic emission.As a kind of Dynamic Non-Destruction Measurement technology, it can monitor security and the overload alarm of defect for a long time, continuously, for Analysis of Structural Damage research with to obtain material internal cracking information be a kind of effective method, the source electricity information about material internal damage spatial and temporal distributions wherein obtained by AE source electricity technology is called as the information of most worthy.Acoustic emission signal processing can understand the position of acoustic emission source, character and the order of severity.In correlation engineering application aspect, in precise positioning structure defect position and assess its hazard level, and then taking measures to remedy, is also major function and the final purpose of Non-Destructive Testing.Crack localization method based on acoustic emission can be divided into two large classes, i.e. regional mapping method and static fixing method (also referred to as time-of-arrival loaction).The determined sound source position of regional mapping method is only expressed as a region, has certain uncertainty.Fix point method is that the measurements of arrival time data that calibrate AE sensor by processing more than three or three collects signal position unknown acoustic emission source position, be a kind of important passive location method, linear orientation, plane positioning and three-dimensional localization can be divided into.The method first will estimate acoustic emission source to arrive the relative time of each array element sensor poor, the range difference of each sensor to acoustic emission source is calculated again by the mistiming, the last position being determined concrete acoustic emission source by geometric algorithm or search, positioning result affects significantly by the velocity of sound.Due to time of arrival, the measurement of difference has absoluteness, do not have ambiguity, required channel quantity is few, and the working band that time-of-arrival direction finding location adapts to is wide, positioning precision is high, and this technology can not produce phase ambiguity to isotropic material while maintenance high-precision direction finding location.Mainly the outer calibrate AE sensor that pastes is in surface of concrete structure for current distress in concrete position monitor means, and there is bonding, the coupled problem of sensor and concrete interface, sensing accuracy can significantly reduce, and then causes crackle location inaccurate.Meanwhile, concrete is typical anisotropic material, and sound wave also exists decay, reflection, distortion in the process propagated.And be not definite value by testing the velocity of sound recorded, the velocity of sound is on positioning result impact significantly.In practical application, by may detect acoustic emission signal, be but difficult to the accurate location finding acoustic emission source.How improving the positioning precision in crack, at utmost reduce and leak location and pseudo-location, is Acoustic Emission location and a major issue in evaluation.
Summary of the invention
The present invention is directed to above-mentioned deficiency, for realizing the accurate location of fracture, the invention provides a kind of distress in concrete accurate positioning method.Compared with existing location technology, the present invention adopts flush type calibrate AE sensor to monitor concrete crack.Because in sensor Transducers Embedded in Concrete, wrap up by concrete, can receive the sound wave of all directions, and signal amplitude is large, Mintrop wave is obvious, reduces the velocity of sound to the impact of positioning result, then reaches pinpoint object.The method is carried out after water-proofing treatment by calibrate AE sensor through epoxy encapsulation, be embedded in xoncrete structure as a large aggregate, calibrate AE sensor is connected with acoustic emission monitor(ing) equipment by concentric cable, and acoustic emission monitor(ing) equipment used is the PCI-2 system of American Physical acoustics company.With disconnected plumbous signal imitation concrete cracking, position with the three-dimensional localization function fracture of PCI-2.After monitoring, the result of simulation fracture monitoring test is compared with being affixed on the simulation fracture monitoring result of same surface of test piece outside use same sensitivity sensor, locator data is analyzed, in flush type calibrate AE sensor monitoring result, absolute coordinates error reduces 38.3%, and average difference reduces 51.3%, and flush type calibrate AE sensor Position location accuracy is higher, discreteness is little, greatly improves the positioning precision of sound source.
The invention provides the placement technology of a kind of application and xoncrete structure health monitoring, simple to operate, rational in infrastructure, easy to use, have great importance to carrying out concrete test research.
The present invention, to distress in concrete registration, at utmost reduces and leaks location and pseudo-location.
Accompanying drawing explanation
Fig. 1 is that calibrate AE sensor of the present invention is in concrete middle layout and the connection diagram with acoustic emission monitor(ing) equipment;
Fig. 2 is the disconnected plumbous measuring point schematic diagram of the present invention when monitoring;
Fig. 3 is the flush type acoustic emission three-dimensional localization result in test;
Fig. 4 is the external acoustic emission three-dimensional localization result in test.
In figure, 1, flush type calibrate AE sensor, 2, concrete, 3, coaxial shielded cable, 4, acoustic emission monitor(ing) equipment.
Embodiment
Below by specific embodiment, the present invention will be further elaborated, it is to be understood that following explanation is only to explain the present invention, do not limit particular content.
With reference to accompanying drawing, a kind of distress in concrete accurate positioning method, the method is carried out after water-proofing treatment by calibrate AE sensor through epoxy encapsulation, and be embedded in xoncrete structure as a large aggregate, calibrate AE sensor is connected with acoustic emission monitor(ing) equipment by coaxial shielded cable.Acoustic emission monitor(ing) equipment is used for record and analyzes acoustic emission source information.According to the acoustic emission signal received to locate the position in concrete acoustic emission source (crack), observe its development tendency simultaneously.Acoustic emission monitor(ing) equipment used is the PCI-2 system of American Physical acoustics company.The number of said calibrate AE sensor 1 is four, choose basic point 0, be as the criterion with basic point O and determine the concrete coordinate position of four calibrate AE sensors 1 respectively, and be arranged in concrete 2, four calibrate AE sensors 1 are drawn respectively by coaxial shielded cable 3, to acoustic emission monitor(ing) equipment 4, for receiving acoustic emission signal, acoustic emission monitor(ing) equipment is used for record and analyzes acoustic emission source information.In the present invention, the layout of calibrate AE sensor is crucial.At present, the arrangement applying main calibrate AE sensor at engineering field to be pasted and concrete surface outward it, and there is bonding, the coupled problem of sensor and concrete interface, sensing accuracy can significantly reduce, and then causes crackle location inaccurate.Meanwhile, concrete is typical anisotropic material, and sound wave also exists decay, reflection, distortion in the process propagated.And be not definite value by testing the velocity of sound recorded, the velocity of sound is on positioning result impact significantly.In practical application, by may detect acoustic emission signal, be but difficult to the accurate location finding acoustic emission source.Flush type calibrate AE sensor is adopted in the present invention.Calibrate AE sensor is embedded in xoncrete structure as a large aggregate, because in sensor Transducers Embedded in Concrete, wrap up by concrete, can receive the sound wave of all directions, and signal amplitude is large, Mintrop wave is obvious, reduce the velocity of sound to the impact of positioning result, then reach pinpoint object.
The using method of this distress in concrete accurate positioning method is: in concrete when calibrate AE sensor is imbedded building according to concrete condition.During monitoring, sensor receives the acoustic emission signal that concrete causes because of cracking etc., connects acoustic emission monitor(ing) device by shielding line, according to the acoustic emission signal received to locate the position in concrete acoustic emission source (crack), observes its development tendency simultaneously.
With testing laboratory's embodiment, principle of work of the present invention is illustrated below.
This test is acoustic emission signal three-dimensional localization experiment on concrete sample, carrys out simulated sound transmit by disconnected lead.This experimental study to the effect that utilize flush type calibrate AE sensor to carry out position monitor to break the particular location of lead stamp onomatopoeia emissive source and sound source information, inquire into flush type calibrate AE sensor three-dimensional localization to the validity improving positioning precision.Test design is as follows: first, sensor of the present invention is placed in concrete respectively and makes module, concrete sample is of a size of 500mm500mm400mm, be connected with acoustic emission monitoring system, Sensor monitoring matrix is set up in acoustic emission system, to set at 0 for basic point, in this experiment, each sensor coordinates of flush type is specific as follows, and 1
#(400,300,20), 2
#(480,100,400), 3
#(100,300,480), 4
#(20,100,100).Set relevant acoustic emission parameters, test specimen is determined prejudge plumbous point, as shown in Figure 2, on each point disconnected plumbous 10 times, form disconnected lead stamp onomatopoeia and to transmit positioning result three-dimensional plot.Simultaneously to batch, homogenous quantities external sensor carries out identical disconnected lead stamp onomatopoeia transmiting signal source location test, the position monitor result under flush type and external sensor condition is as shown in Figure 3, Figure 4.For flush type calibrate AE sensor, its concrete broken lead stamp onomatopoeia emissive source 3D positioning result relatively truth, less with true value discreteness, well achieve concrete acoustic emission and accurately locate.And same batch, external calibrate AE sensor 3D location test result discreteness compared with truth of same sensitivity is comparatively large, and concrete Acoustic Emission location result is not very accurate, and positioning result projection discreteness is larger.Positioning result statistical study shows, and compares with outer subsides Sensor monitoring result, and in flush type calibrate AE sensor monitoring result, absolute coordinates error reduces 38.3%, and average difference reduces 51.3%.Flush type calibrate AE sensor Position location accuracy is higher, and discreteness is little, greatly improves the positioning precision of sound source.
Claims (2)
1. a distress in concrete accurate positioning method, it is characterized in that: the method is carried out after water-proofing treatment by calibrate AE sensor (1) through epoxy encapsulation, be embedded in concrete (2) structure as a large aggregate, calibrate AE sensor (1) is connected with acoustic emission monitor(ing) equipment (4) by coaxial shielded cable (3), acoustic emission monitor(ing) equipment (4) is for record and analyze acoustic emission source information, according to the acoustic emission signal received to locate the position in concrete acoustic emission source (crack), observe its development tendency simultaneously.
2. according to distress in concrete accurate positioning method according to claim 1, it is characterized in that: the number of described calibrate AE sensor (1) is four, choose basic point 0, be as the criterion with basic point O and determine the concrete coordinate position of four calibrate AE sensors (1) respectively, and be arranged in concrete (2), four calibrate AE sensors (1) are drawn respectively by coaxial shielded cable (3), to acoustic emission monitor(ing) equipment (4), for receiving acoustic emission signal, acoustic emission monitor(ing) equipment is used for record and analyzes acoustic emission source information.
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| CN201310481241.8A CN104569159A (en) | 2013-10-15 | 2013-10-15 | Accurate positioning method for concrete crack |
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| CN201310481241.8A CN104569159A (en) | 2013-10-15 | 2013-10-15 | Accurate positioning method for concrete crack |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105334266A (en) * | 2015-11-11 | 2016-02-17 | 华北理工大学 | Rock acoustic emission source positioning method |
| CN106706758A (en) * | 2017-03-14 | 2017-05-24 | 中交武汉港湾工程设计研究院有限公司 | Concrete structure cracking monitoring system and cracking monitoring method thereof |
| CN107807135A (en) * | 2017-07-31 | 2018-03-16 | 水利部交通运输部国家能源局南京水利科学研究院 | The method that crackle crack initiation early warning built in a kind of transparent material and extension monitor in real time |
| CN110261475A (en) * | 2019-05-15 | 2019-09-20 | 宝钢特钢韶关有限公司 | Manual ultrasonic precise positioning method for inclusions in round steel |
| CN110687211A (en) * | 2019-10-21 | 2020-01-14 | 西安建筑科技大学 | Reinforced concrete member acoustic emission crack source positioning method based on corrected wave speed |
| CN113607824A (en) * | 2021-08-16 | 2021-11-05 | 赵跃 | Method for monitoring cracks in concrete beam plate pouring process |
| CN114397369A (en) * | 2021-12-31 | 2022-04-26 | 临沂大学 | A can bury multidimensional acoustic emission sensor for concrete damage monitoring |
| CN115406385A (en) * | 2022-09-30 | 2022-11-29 | 武汉路通市政工程质量检测中心有限公司 | Method for monitoring fracture of prestressed reinforcement in cable-stayed bridge cable tower anchoring area |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105334266A (en) * | 2015-11-11 | 2016-02-17 | 华北理工大学 | Rock acoustic emission source positioning method |
| CN106706758A (en) * | 2017-03-14 | 2017-05-24 | 中交武汉港湾工程设计研究院有限公司 | Concrete structure cracking monitoring system and cracking monitoring method thereof |
| CN107807135A (en) * | 2017-07-31 | 2018-03-16 | 水利部交通运输部国家能源局南京水利科学研究院 | The method that crackle crack initiation early warning built in a kind of transparent material and extension monitor in real time |
| CN107807135B (en) * | 2017-07-31 | 2020-05-01 | 水利部交通运输部国家能源局南京水利科学研究院 | Method for early warning crack initiation and real-time monitoring expansion of built-in crack of transparent material |
| CN110261475A (en) * | 2019-05-15 | 2019-09-20 | 宝钢特钢韶关有限公司 | Manual ultrasonic precise positioning method for inclusions in round steel |
| CN110261475B (en) * | 2019-05-15 | 2021-12-10 | 宝钢特钢韶关有限公司 | Manual ultrasonic precise positioning method for inclusions in round steel |
| CN110687211A (en) * | 2019-10-21 | 2020-01-14 | 西安建筑科技大学 | Reinforced concrete member acoustic emission crack source positioning method based on corrected wave speed |
| CN113607824A (en) * | 2021-08-16 | 2021-11-05 | 赵跃 | Method for monitoring cracks in concrete beam plate pouring process |
| CN114397369A (en) * | 2021-12-31 | 2022-04-26 | 临沂大学 | A can bury multidimensional acoustic emission sensor for concrete damage monitoring |
| CN114397369B (en) * | 2021-12-31 | 2023-12-22 | 临沂大学 | A can embed multidimensional acoustic emission sensor for concrete damage monitoring |
| CN115406385A (en) * | 2022-09-30 | 2022-11-29 | 武汉路通市政工程质量检测中心有限公司 | Method for monitoring fracture of prestressed reinforcement in cable-stayed bridge cable tower anchoring area |
| CN115406385B (en) * | 2022-09-30 | 2023-08-11 | 武汉路通市政工程质量检测中心有限公司 | Method for monitoring fracture of prestressed reinforcement in anchoring area of cable-stayed bridge cable tower |
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