CN102759744B - Method for detecting cavity steel lining concrete void thickness - Google Patents
Method for detecting cavity steel lining concrete void thickness Download PDFInfo
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- CN102759744B CN102759744B CN201210204680.XA CN201210204680A CN102759744B CN 102759744 B CN102759744 B CN 102759744B CN 201210204680 A CN201210204680 A CN 201210204680A CN 102759744 B CN102759744 B CN 102759744B
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 26
- 239000010959 steel Substances 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 17
- 239000011800 void material Substances 0.000 title abstract 5
- 238000001514 detection method Methods 0.000 claims abstract description 27
- 238000012360 testing method Methods 0.000 claims description 5
- 238000004458 analytical method Methods 0.000 claims description 3
- 238000006467 substitution reaction Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 238000009527 percussion Methods 0.000 description 1
- 230000005236 sound signal Effects 0.000 description 1
- 230000002889 sympathetic effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
Abstract
The invention discloses a method for detecting the void thickness of steel lining concrete of a cavern. The method is that a transducer is arranged on a steel lining surface of a cavern, a vibration source is adopted near the transducer to vibrate the steel lining surface and an air layer behind the steel lining, and vibration waves are received by the transducer and recorded by a detector; and (4) processing and contrastively analyzing the vibration wave signal parameters by a computer, and calculating the steel lining concrete void thickness of the detected part. The method has the advantages that the simple and convenient device is utilized, the detection effect on the void thickness and the void degree is good, the used device can be rapidly moved according to the position of the detection point, the method is convenient and rapid, the workload is small, and the detection cost is low.
Description
Technical field
The present invention relates to a kind of waterwork physics exploration detection method, particularly a kind of cavern behind steel-lined concrete gap detection method, belongs to hydraulic engineering technical field.
Background technology
In Hydraulic and Hydro-Power Engineering, water conservancy project diversion tunnel pressure pipeline refers to pipeline from pressure balance chamber to the hydraulic turbine that carry the water yield from reservoir, forebay or, and its general characteristic is that internal water pressure is large, bears the flowing pressure of water hammer.For the large hydropower station of high water head, common pressure pipeline is generally steel lining concrete pipe.Because steel lining concrete is born the function such as high pressure and antiseepage, so must close contact between engine request steel lining and concrete.In work progress, between steel lining and external wrapping concrete, easily form cavity defect, by detecting steel lining and concrete cavity defect, can assess steel lining and concrete combination situation, and provide technological guidance for eliminating defect construction.
Chinese patent literature application number is 200820222263.7, name is called in the file of " tunnel lining hollow detection device " and discloses a kind of tunnel lining hollow detection device, this device is at two supports of bipod plane layout of Shing Mun Tunnel, on left socle, establish air compressor, on right support, establish accumulator jar, Programmable Logic Controller, signal processor, computing machine, accumulator jar is connected with Programmable Logic Controller with air compressor by wire, computing machine is connected with signal processor with Programmable Logic Controller by cable, on left socle, establishing one end is connected with air compressor, the other end is located at the high-pressure rubber pipe on right support, on high-pressure rubber pipe, establish 10～20 vibrating motors and 10～20 microphones, vibrating motor is connected with Programmable Logic Controller by wire, microphone is connected with signal processor by wire.Vibrating motor is to tunnel-liner vibration percussion sounding, the sound signal that microphone receives converts electric signal to and outputs to signal processor, signal processor amplifies electric signal and carries out A/D and converts digital signal to and output to computing machine, and whether computing machine is determined the position of being knocked the degree of depth and the area that come to nothing disease and come to nothing.This pick-up unit is mainly applicable to shape tunnel, city gate (if center of effort that left and right, full circular tunnel bottom support is not installed), simultaneously, this method all scans detection to full section, need a large amount of vibrating motor and microphone, operation and data processing work amount are large, with the mobile inconvenience of timer, detection progress is slow, and cost is high.
Therefore the technical scheme that detects at present cavern's behind steel-lined concrete gap thickness is desirable not enough.
Summary of the invention
The object of the invention is to: provide the detection method of a kind of cavern behind steel-lined concrete gap thickness, to overcome the deficiencies in the prior art.
For solving the problems of the technologies described above, the detection method of a kind of cavern of the present invention behind steel-lined concrete gap thickness, is characterised in that the method comprises the following steps:
1) manually knock concrete steel lining surface, cavern, the position that obtains coming to nothing, the preliminary district of coming to nothing that delimit;
2) settle and fix transducer on steel lining within the scope of the district surface of coming to nothing, transducer is connected with detecting instrument by cable, is coming to nothing within the scope of district and the transducer location arrangements focus of 0～2m apart;
3), after detecting instrument start is ready to, with focus vibration steel lining surface, vibration wave is received by transducer, and by detecting instrument record;
4) vibration wave, by computing machine Treatment Analysis, draws the vibration wave dominant frequency amplitude A of check point
0, the 5th wave amplitude value A after vibration wave dominant frequency
5and the parameter values for detection such as vibration wave frequency f;
5) coming to nothing within the scope of district, mobile measuring point and focus, carry out multiple measuring point all standings with grid configuration in the district's scope of coming to nothing and detect, and obtains many group parameter values for detection, determines the cavity areas S in the district of coming to nothing simultaneously from vibrational waveform;
6) by parameter values for detection and cavity areas S substitution following formula, the thickness h of coming to nothing of each point of district that can obtain coming to nothing:
In above formula: what h was test point come to nothing thickness (m), S is cavity areas (m
2), k is cavity areas coefficient, A
0for vibration wave dominant frequency amplitude, A
5for the 5th wave amplitude value after vibration wave dominant frequency, f is vibration wave frequency (H
z), n is calibration parameter; Wherein, cavity areas coefficient k and calibration parameter n use one group of vibration wave parameter value that is no less than the district's detection of coming to nothing of known come to nothing thickness h and the cavity areas S of 9 points to determine by conventional trial and error procedure.
Compared with prior art, this method provides a kind of cavity defect that adopts the method for vibration frequency to detect cavern's steel lining concrete, the method adopts focus vibration steel lining face, cause steel lining face and the resonance of air vibration below (sympathetic response is named again in air resonance), test vibration frequency, amplitude and correlation parameter, and calculate the method for behind steel-lined concrete gap thickness.This method is utilized simple and convenient device, aspect come to nothing thickness and the degree of coming to nothing detect effective, and use device can be according to the position fast moving of check point, convenient and swift, workload is little, testing cost is low.
Brief description of the drawings
Fig. 1 is structural representation of the present invention.
Being labeled as in accompanying drawing: 1-detecting instrument, 2-transducer, 3-focus, 4-cable, 5-steel lining, 6-concrete, the 7-district of coming to nothing.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As shown in Figure 1, the position of coming to nothing between steel lining 5 and concrete 6 is for the district 7 of coming to nothing, and the projected area of district 7 on steel lining 5 of coming to nothing is the area S in district 7 of coming to nothing.Before detection, by manually existing the position that concrete 6 comes to nothing to knock in cavern with special hammer or other instruments, feel when knocking the sound that sends and knock judges whether to exist comes to nothing, judgement is existed after the position preliminary judgement cavity areas coming to nothing, the delimitation district 7 of coming to nothing, the district 7 of coming to nothing should comprise the cavity areas region of preliminary judgement completely.
Settle and fix transducer 2 on steel lining in district's 7 scopes 5 surfaces of coming to nothing, transducer 2 is connected with detecting instrument 1 by cable 4, near the layout focus 3 transducer 2 that comes to nothing in district's 7 scopes.The distance of focus 3 and transducer 2 is generally in 0.5m, and maximum is no more than 2m, can ensure that like this transducer 2 accurately receives the vibration signal transmitting from focus 3.After detecting instrument 1 start is ready to, vibrate steel lining 5 surfaces with focus 3, vibration wave is received by transducer 2, and by detecting instrument 1 record.Vibration wave, by computing machine Treatment Analysis, draws the vibration wave dominant frequency amplitude A of check point
0, the 5th wave amplitude value A after vibration wave dominant frequency
5and the parameter values for detection such as vibration wave frequency f.At mobile measuring point and the focus in district's 7 scopes that come to nothing, detect in the multiple measuring point all standings within the scope of district of coming to nothing with grid configuration, obtain many group parameter values for detection, from vibrational waveform, determine the cavity areas S in the district of coming to nothing simultaneously.By parameter values for detection and cavity areas S substitution following formula, the thickness h of coming to nothing of district's 7 each measuring points that can obtain coming to nothing.
In above formula: what h was test point come to nothing thickness (m), S is cavity areas (m
2), k is cavity areas coefficient, the value of k between 0.2～0.6, A
0for vibration wave dominant frequency amplitude, A
5for the 5th wave amplitude value after vibration wave dominant frequency, f is vibration wave frequency (H
z), n is calibration parameter; Wherein, cavity areas coefficient k and calibration parameter n use one group of vibration wave parameter value that is no less than the district of coming to nothing (7) detection of known come to nothing thickness h and the cavity areas S of to determine by trial and error procedure at 9.
The district's tentative calculation of coming to nothing of one group of known come to nothing thickness h and cavity areas S determines that the method for cavity areas coefficient k and calibration parameter n is: selected known thick, in, the thin thickness h of coming to nothing, the measuring point value in the district of coming to nothing of corresponding known large, medium and small cavity areas S respectively, from k=0.2, step-length is 0.01, start tentative calculation, finish to k=0.6, the value of getting best-fit place is k and the n value in this district of coming to nothing.
Embodiments of the present invention are not limited to above-described embodiment, within the technical scheme that is equal to replacement or equivalent transformation formation adopting under the premise without departing from the principles of the invention all belongs to protection scope of the present invention.
Claims (1)
1. a detection method for cavern's behind steel-lined concrete gap thickness, is characterized in that: the method comprises the following steps:
1) manually knock steel lining (5) surface of cavern's concrete (6), the position that obtains coming to nothing, the preliminary district (7) of coming to nothing that delimit;
2) surface of the steel lining (5) in the district of coming to nothing (7) scope is settled and is fixed transducer (2), transducer (2) is connected with detecting instrument (1) by cable (4), in the district of coming to nothing (7) scope and transducer (2) the location arrangements focus (3) of 0～2m apart;
3), after detecting instrument (1) start is ready to, with focus (3) vibration steel lining (5) surface, vibration wave is received by transducer (2), and by detecting instrument (1) record;
4) vibration wave, by computing machine Treatment Analysis, draws the vibration wave dominant frequency amplitude A of check point
0, the 5th wave amplitude value A after vibration wave dominant frequency
5and vibration wave frequency f parameter values for detection;
5) in the district of coming to nothing (7) scope, mobile measuring point and focus (3), carry out measuring point all standing detection with grid configuration in the district of coming to nothing (7) scope, obtain parameter values for detection, from vibrational waveform, determine the cavity areas S in the district of coming to nothing (7) simultaneously;
6) by parameter values for detection and cavity areas S substitution following formula, the thickness h of coming to nothing of each point of district that can obtain coming to nothing:
In above formula: what h was test point come to nothing thickness, S is cavity areas, k is cavity areas coefficient, A
0for vibration wave dominant frequency amplitude, A
5for the 5th wave amplitude value after vibration wave dominant frequency, f is vibration wave frequency, and n is calibration parameter; Wherein, cavity areas coefficient k and calibration parameter n use one group of vibration wave parameter value that is no less than the district of coming to nothing (7) detection of known come to nothing thickness h and the cavity areas S of 9 points to determine by conventional trial and error procedure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210204680.XA CN102759744B (en) | 2012-06-20 | 2012-06-20 | Method for detecting cavity steel lining concrete void thickness |
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| CN201210204680.XA CN102759744B (en) | 2012-06-20 | 2012-06-20 | Method for detecting cavity steel lining concrete void thickness |
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| CN102759744B true CN102759744B (en) | 2014-10-22 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104155365A (en) * | 2013-05-14 | 2014-11-19 | 中国水电顾问集团贵阳勘测设计研究院 | Detection method and device for tunnel lining concrete void |
| CN106049657A (en) * | 2016-07-29 | 2016-10-26 | 天津市市政工程设计研究院 | Method for detecting soil disengagement around urban drainage pipeline |
| CN108845030A (en) * | 2018-05-03 | 2018-11-20 | 张家港申乾工程技术服务有限公司 | A method of detecting tube circumference medium state in large diameter pipeline |
| CN110441394A (en) * | 2019-08-08 | 2019-11-12 | 上海市建筑科学研究院 | Existing external thermal insulation system detection method based on acoustic index |
| CN111103355A (en) * | 2019-12-23 | 2020-05-05 | 山东大学 | Device and method for detecting compactness of carbon fiber plate reinforced colloid |
| CN111487315A (en) * | 2020-04-17 | 2020-08-04 | 四川陆通检测科技有限公司 | Audio frequency nondestructive testing method for tunnel lining thickness and void |
| CN112946079B (en) * | 2021-03-02 | 2022-03-01 | 中国水利水电科学研究院 | A system and method for detecting void mass energy of thick steel shell concrete |
| CN116222448B (en) * | 2023-04-04 | 2025-07-22 | 四川陆通检测科技有限公司 | Method for detecting tunnel inverted arch thickness based on impact echo method in multiple channels |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175771A (en) * | 2011-01-18 | 2011-09-07 | 重庆市科学技术研究院 | Method for detecting steel tube void of concrete filled steel tube (CFST) arch bridge by utilizing transient impact method |
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| JP3340702B2 (en) * | 1999-07-08 | 2002-11-05 | 株式会社東建工営 | A method for measuring deterioration of a concrete structure and a measuring device therefor. |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175771A (en) * | 2011-01-18 | 2011-09-07 | 重庆市科学技术研究院 | Method for detecting steel tube void of concrete filled steel tube (CFST) arch bridge by utilizing transient impact method |
Non-Patent Citations (3)
| Title |
|---|
| JP特开2001-21336A 2001.01.26 |
| 混凝土路面板脱空检测的研究;魏伟;《重庆建筑》;20071231(第2 期);39-41 * |
| 魏伟.混凝土路面板脱空检测的研究.《重庆建筑》.2007,(第2 期),39-41. |
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Address after: 550081 No. 16 Xing Qian Road, Jinyang New District, Guizhou, Guiyang Applicant after: POWERCHINA GUIYANG ENGINEERING CORPORATION LIMITED Address before: 550081 No. 16 Xing Qian Road, Jinyang New District, Guizhou, Guiyang Applicant before: HydroChina Guiyang Engineering Corp. |
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