CN104360046B - Comprehensive geophysical-prospecting combined diagnosis method for hidden danger inside wharf concrete structure - Google Patents
Comprehensive geophysical-prospecting combined diagnosis method for hidden danger inside wharf concrete structure Download PDFInfo
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- CN104360046B CN104360046B CN201410621613.7A CN201410621613A CN104360046B CN 104360046 B CN104360046 B CN 104360046B CN 201410621613 A CN201410621613 A CN 201410621613A CN 104360046 B CN104360046 B CN 104360046B
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Abstract
The invention discloses a comprehensive geophysical-prospecting combined diagnosis method for hidden danger inside a wharf concrete structure. The comprehensive geophysical-prospecting combined diagnosis method comprises the following steps: dividing the surface of a detected concrete structure into cells on the spot; detecting by adopting an impact-echo instrument; according to the impact-echo data, calibrating sound wave transmission speed of the detected concrete structure and finding out positions of internal defects by adopting a ground penetrating radar instrument; detecting CT images of the internal defects by adopting an ultrasonic CT imaging method, and further checking the true and the false of the defect images of a geological radar process, and finally determining the types and the positions of the internal defects of the concrete by comparing the image with design data. Compared with the prior art, the comprehensive geophysical-prospecting system method has the advantages that a system method and a novel technology for comprehensive geophysical-prospecting of hidden problems of concrete structure quality of a long piled wharf are formed by virtue of a plurality of large-scale high piled wharf projects, so that perspective eyes are provided for quality control, and therefore, the technical blank in nondestructive examination and safety assessment for the quality hidden problems of the high piled wharf projects in China is filled up.
Description
Technical field
The present invention relates to a kind of marine traffic engineering implementation, particularly relate to the internal hidden danger of a kind of concrete structure of wharf
Complex geophysical prospecting Combining diagnosis method.
Background technology
Marine traffic engineering quality and operation conditions are matters vital to national well-being and the people's livelihood, have inside its xoncrete structure crack,
The equiprobable internal hidden danger form of expression of cavity, steel bar corrosion and broken pile, how to the engineering matter being in hidden state
Amount checks, the always bottleneck problem of engineering constraint quality examination.Conventional code header structure inside concrete hidden danger
Detection has the disadvantage in that (1) uses single method or equipment Inspection, is difficult to accurately by instrument self character limitation
Judge hidden danger character and position, as used electromagnetic method cannot detect the diaphram wall containing reinforcing bar, use sonic method without
The steel sheet pile structure that method investigation depth is bigger, uses electrical method cannot accurately detect the inner case of underwater concrete structure
Deng.(2) in geophysical prospecting, investigation depth is inversely proportional to detection accuracy, and single method cannot be to different deep on same component
Degree, the defect of different volumes differentiate；Along with the quick growth of Chinese Water Transportation engineering foundation Facilities Construction scale,
In the urgent need to the detection new technique of the hidden problem of marine traffic engineering quality, new method.
Summary of the invention
The purpose of the present invention is that provides a kind of concrete structure of wharf internal hidden danger to solve the problems referred to above
Complex geophysical prospecting Combining diagnosis method.
The present invention is achieved through the following technical solutions above-mentioned purpose:
The present invention comprises the following steps:
(1) the on-the-spot cell that detected concrete body structure surface is divided 400mm × 100mm；
(2) impact echo instrument is used to detect along X (Y) coordinate, same direction wire；
(3) according to impact echo data, the acoustic wave propagation velocity of detected concrete structure is demarcated；
(4) according to velocity of wave formulaCalculate the relative dielectric constant ε for medium of tested worksr, make
Arrange for GPR instrument parameter；
(5) GPR instrument is used to detect along X (Y) coordinate, same direction wire, find out internal flaw
Position；
(6) use ultrasonic CT imaging method, detect the CT image of internal flaw, further verification geology thunder
Reach the defect image true and false of method, after contrasting with design data, finally determine type and the position of defect in concrete
Put.
The beneficial effects of the present invention is:
The present invention is the complex geophysical prospecting Combining diagnosis method of the internal hidden danger of a kind of concrete structure of wharf, with prior art
Comparing, the present invention relies on multiple large-scale long piled wharf engineering, defines long piled wharf concrete structure quality hidden
The system approach of the complex geophysical prospecting detection of problem and new technique, provide a pair of " eyes of perspective " for quality control,
Fill up China's technological gap in terms of the hidden problem Non-Destructive Testing of long piled wharf construction quality and security evaluation.
Accompanying drawing explanation
Fig. 1 is web arrangement of measuring-line figure on the right of end bay of the present invention；
Fig. 2 and Fig. 3 is the GPR detection profile of survey line 1 and survey line 11 in table 1；
Fig. 4 and Fig. 5 is the impact echo spectrogram of web survey line 7 on the right of end bay in table 2；
Fig. 6 and Fig. 7 is the impact echo spectrogram of web survey line 9 on the right of end bay in table 2；
Fig. 8 and Fig. 9 is the impact echo spectrogram of web survey line 11 on the right of end bay in table 2；
Figure 10 and Figure 11 is web ultra sonic imaging detection profile on the right of end bay.
Detailed description of the invention
The invention will be further described below in conjunction with the accompanying drawings:
The present invention comprises the following steps:
(1) the on-the-spot cell that detected concrete body structure surface is divided 400mm × 100mm；
(2) impact echo instrument is used to detect along X (Y) coordinate, same direction wire；
(3) according to impact echo data, the acoustic wave propagation velocity of detected concrete structure is demarcated；
(4) according to velocity of wave formulaCalculate the relative dielectric constant ε for medium of tested worksr, make
Arrange for GPR instrument parameter；
(5) GPR instrument is used to detect along X (Y) coordinate, same direction wire, find out internal flaw
Position；
(6) use ultrasonic CT imaging method, detect the CT image of internal flaw, further verification geology thunder
Reach the defect image true and false of method, after contrasting with design data, finally determine type and the position of defect in concrete
Put.
The present invention based on GPR method, Impact echo, the complex geophysical prospecting joint diagnosis technology of ultrasound computed tomography method,
For the internal hidden danger of concrete structure of wharf (such as front and back's sheet pile, upper beam plate structure etc.) (crack, hole,
Steel bar corrosion, broken pile, cold seam etc.) detection and assessment.
Described GPR method is based on detecting between objective body and surrounding medium based on the dielectricity difference of existence, profit
With electromagnetic wave propagation path, electromagnetic field intensity and waveform in medium with by the electromagnetic property of medium and geometric shape
And the principle changed, by studying the echo round traveling time, amplitude, frequency and phase property relative to direct wave,
A kind of detection method of hidden body in reaching to determine detected medium.
Described Impact echo is to utilize a mechanical shock in short-term (to rap concrete with a small ball or hand hammer
Surface) produce low frequency stress wave, longitudinal wave propagation to inside configuration, returned by defect and component bottom reflection, this
The sensor that a little echos are installed near shock point receives, and is sent to a built-in high-speed data acquisition
And the portable instrument of signal processing.
Described ultrasonic CT imaging mainly has the ray tomography based on ray theory and based on wave theory
Fluctuation chromatography.Ray theory is to regard the propagation path of supersonic rays as straight line under conditions of ignoring scattering, passes through
Path tracing, ask for methods such as iterative approximations to realize the reconstruct in cross section when walking；Wave theory then considers sound wave
Scattering effect, the impact on sound field of the inhomogeneities of research medium, by setting up medium parameters and receiving between data
Relation,
GPR method uses high-frequency electromagnetic impulse wave to scan continuously, and sample rate is high, to the arrangement of bar-mat reinforcement,
Coming to nothing in concrete and the defect such as leakiness has preferably reflection, the method capacity of resisting disturbance is strong, believes according to echo
Number, to region one-dimensional within survey line can qualitative discrimination defect type, quantitatively judge the spread of defect and depth information.
Impact echo method only needs a test surfaces and is not required to couplant, than sound wave (the IE frequency of ultrasound wave more low frequency
Scope is generally 2～20kHz), this makes impact echo method avoid the high signal run in ultrasonic testing to decline
Subtracting and too much noise jamming problem, after demarcation, each measuring point immediately arrives at defective locations, depth information.
Further, concrete tomography ultrasonic imaging device has a realtime imaging function to internal structure of body, and only need to be
Object while use pulse echo can test.
The method that three of the above is different, can not only the situation of independent judgment defect in concrete, moreover it is possible to mutually confirm.
Calibrated impact echo data can be that ultrasonic imaging method provides value of wave speed accurately, has permissible by GPR method
Finding out the position of internal flaw accurately, the defect image of ultrasonic imaging method the most further verifies GPR method
The defect image true and false, after contrasting with design data, finally determines the type of defect in concrete.
As shown in Figure 1: on the right of end bay, web concrete intensity is C55, average thickness of slab is 80cm, body of wall during detection
About 30 days ages.
It is GPR Analysis on Results as shown in table 1, Fig. 2 and Fig. 3:
Web GPR Analysis on Results table on the right of table 1 end bay
It is impact echo Analysis on Results as shown in table 2, Fig. 4 to Fig. 9:
Web impact echo Analysis on Results table on the right of table 2 end bay
It is ultra sonic imaging Analysis on Results as shown in table 3, Figure 10 and Figure 11:
Complex geophysical prospecting Combining diagnosis detection infer (x6～x7, y7), (x6～x7, y11), (x6～x7, y15),
(x6～x7, y17) has exception of coming to nothing, survey line scope about 6cm, compares with design drawing and through on-site verification, institute
The abnormal actually vertical prestressing pipe laying that comes to nothing detected, caliber is 60mm.
The ultimate principle of the present invention and principal character and advantages of the present invention have more than been shown and described.The skill of the industry
Art personnel it should be appreciated that the present invention is not restricted to the described embodiments, described in above-described embodiment and description only
Being the principle that the present invention is described, without departing from the spirit and scope of the present invention, the present invention also has various change
Changing and improve, these changes and improvements both fall within scope of the claimed invention.Claimed scope
Defined by appending claims and equivalent thereof.
Claims (1)
1. the complex geophysical prospecting Combining diagnosis method of the internal hidden danger of concrete structure of wharf, it is characterised in that
Comprise the following steps:
(1) the on-the-spot cell that detected concrete body structure surface is divided 400mm × 100mm；
(2) impact echo instrument is used to detect along X (Y) coordinate, same direction wire；
(3) according to impact echo data, the acoustic wave propagation velocity of detected concrete structure is demarcated；
(4) according to velocity of wave formulaCalculate the relative dielectric constant ε for medium of tested worksr,
Arrange as GPR instrument parameter；
(5) GPR instrument is used to detect along X (Y) coordinate, same direction wire, find out inside
The position of defect；
(6) use ultrasonic CT imaging method, detect the CT image of internal flaw, further verify spy
The defect image true and false of ground radar method, after contrasting with design data, finally determines defect in concrete
Type and position.
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| CN201410621613.7A CN104360046B (en) | 2014-11-06 | 2014-11-06 | Comprehensive geophysical-prospecting combined diagnosis method for hidden danger inside wharf concrete structure |
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| CN109143232A (en) * | 2018-07-23 | 2019-01-04 | 西华大学 | A kind of prestressed concrete beam lossless detection method |
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| CN108320284A (en) * | 2018-02-06 | 2018-07-24 | 重庆交通大学 | To the detection method and device of concrete filled steel tube interface state |
| CN108375334B (en) * | 2018-02-13 | 2020-06-09 | 南京工程学院 | SAR-based GPR (general purpose concrete) multilayer reinforcing mesh parameter detection method |
| CN109799132B (en) * | 2019-01-16 | 2021-06-08 | 河海大学 | Strain test-based method for identifying damage to foundation pile of high-pile wharf |
| CN110261481B (en) * | 2019-07-26 | 2023-12-12 | 招商局重庆公路工程检测中心有限公司 | Point pressure type acquisition device |
| CN111724358A (en) * | 2020-06-11 | 2020-09-29 | 华中科技大学 | Concrete quality detection method and system based on image and convolutional neural network |
| CN111948289B (en) * | 2020-08-24 | 2023-07-21 | 四川升拓检测技术股份有限公司 | Concrete cold joint quality detection method, device and system based on shock elastic waves |
| CN113884550B (en) * | 2021-09-09 | 2022-05-10 | 水利部交通运输部国家能源局南京水利科学研究院 | Method for measuring dielectric constant of soil body/concrete in field layering manner and application thereof |
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