CN102759744A - Method for detecting grotto steel lining concrete void thickness - Google Patents

Method for detecting grotto steel lining concrete void thickness Download PDF

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Publication number
CN102759744A
CN102759744A CN201210204680XA CN201210204680A CN102759744A CN 102759744 A CN102759744 A CN 102759744A CN 201210204680X A CN201210204680X A CN 201210204680XA CN 201210204680 A CN201210204680 A CN 201210204680A CN 102759744 A CN102759744 A CN 102759744A
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nothing
coming
comes
district
steel lining
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CN201210204680XA
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CN102759744B (en
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尹学林
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China Hydropower Consulting Group Guiyang Survey and Design Institute
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China Hydropower Consulting Group Guiyang Survey and Design Institute
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Abstract

The invention discloses a method for detecting grotto steel lining concrete void thickness. The method comprises the following steps that: an energy converter is arranged at a grotto steel lining plane, the steel lining plane and an air layer behind the steel lining vibrate by using a vibration source near the energy converter; the vibration wave is accepted by the energy converter and is recorded by a detector; and after vibration wave parameters are processed by a computer and subjected to comparison and analysis, the steel lining concrete void thickness at a detecting part is calculated. By utilizing a simple and convenient device, the method is good in detection effect on void thickness and void degree, is convenient and rapid, small in working quantity and low in detection cost; and moreover the device used can move rapidly according to the position of a detecting point.

Description

The come to nothing detection method of thickness of cavern's steel lining concrete
Technical field
The present invention relates to a kind of waterwork physics exploration detection method, steel lining concrete detection method of coming to nothing in particularly a kind of cavern belongs to the hydraulic engineering technical field.
Background technology
In Hydraulic and Hydro-Power Engineering, water conservancy project diversion tunnel pressure pipeline is meant from reservoir, forebay or pressure balance chamber carries the pipeline of the water yield to the hydraulic turbine, and characteristics are that internal water pressure is big as the one of which, bear the flowing pressure of water hammer.For the large hydropower station of high water head, common pressure pipeline generally is the steel lining concrete pipe.Because the steel lining concrete bears functions such as high pressure and antiseepage, so must closely contact between engine request steel lining and the concrete.In work progress, form cavity defect between steel lining and the external wrapping concrete easily, through detecting steel lining and concrete cavity defect, can assess steel lining and the concrete situation that combines, and the technological guidance is provided for eliminating the defective construction.
Chinese patent document application number is 200820222263.7, name is called and discloses a kind of tunnel-liner pick-up unit that comes to nothing in the file of " tunnel-liner come to nothing pick-up unit "; This device is provided with two supports on the bipod plane of Shing Mun Tunnel; On left socle, establish air compressor, establish accumulator jar, Programmable Logic Controller, signal processor, computing machine on the right support, accumulator jar is connected with Programmable Logic Controller with air compressor through lead; Computing machine is connected with signal processor with Programmable Logic Controller through cable; Establish an end on the left socle and be connected with air compressor, the other end is located at the high-pressure rubber pipe on the right support, establishes 10~20 vibrating motors and 10~20 microphones on the high-pressure rubber pipe; Vibrating motor is connected with Programmable Logic Controller through lead, and microphone is connected with signal processor through lead.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 has come to nothing disease and the degree of depth and the area that come to nothing.This pick-up unit mainly is applicable to shape tunnel, city gate (if the left and right sides, bottom, wholecircle shape tunnel support does not have the center of effort of installation); Simultaneously, this method all scans detection to full section, needs a large amount of vibrating motor and microphone; Operation and data processing work amount are big; The mobile inconvenience of installing simultaneously, the detection progress is slow, and cost is high.
Therefore at present it is desirable not enough to detect the come to nothing technical scheme of thickness of cavern's steel lining concrete.
Summary of the invention
The objective of the invention is to: the detection method that provides a kind of cavern steel lining concrete to come to nothing thickness, to overcome the deficiency of prior art.
For solving the problems of the technologies described above, steel lining concrete come to nothing detection method of thickness in a kind of cavern of the present invention is characterised in that this method may further comprise the steps:
1) concrete steel lining surface, cavern, the position that obtains coming to nothing, the preliminary district of coming to nothing that delimit are knocked in manual work;
2) steel lining in the district's scope of coming to nothing surface is settled and is fixed transducer, and transducer is connected with detecting instrument through cable, in the district's scope of coming to nothing with the transducer location arrangements focus of 0~2m apart;
3) after the detecting instrument start was ready to, with focus vibration steel lining surface, vibration wave was received by transducer, and by the detecting instrument record;
4) vibration wave draws the vibration wave dominant frequency amplitude A of check point through the Computer Processing analysis 0, the 5th wave amplitude value A after the vibration wave dominant frequency 5And parameter values for detection such as vibration wave frequency f;
5) in the district's scope of coming to nothing, move measuring point and focus, carry out a plurality of measuring point all standings with grid configuration in the district's scope of coming to nothing and detect, obtain many group parameter values for detection, from vibrational waveform, determine the area S that comes to nothing in the district of coming to nothing simultaneously;
6) with the parameter values for detection and the area S substitution following formula that comes to nothing, the thickness h of coming to nothing of each point of district that can obtain coming to nothing:
h = n S k A 5 A 0 f
In following formula: h is the thickness that comes to nothing (m) of test point, and S is the area (m that comes to nothing 2), k is the area coefficient that comes to nothing, A 0Be vibration wave dominant frequency amplitude, A 5Be the 5th wave amplitude value after the vibration wave dominant frequency, f is vibration wave frequency (H Z), n is the calibration parameter; Wherein, come to nothing area coefficient k and calibration parameter n confirms through conventional trial and error procedure for the vibration wave parameter value that uses one group of known district of coming to nothing of coming to nothing the thickness h and the area S that comes to nothing that is no less than 9 points to detect.
Compared with prior art; This method provides a kind of method of vibration frequency that adopts to detect the concrete cavity defect of cavern's steel lining; This method adopts focus vibration steel lining face; Cause the steel lining face and below air vibration resonance (sympathetic response is named in air resonance again), test vibration frequency, amplitude and correlation parameter, and calculate the come to nothing method of thickness of steel lining concrete.This method is utilized simple and convenient device, aspect the come to nothing thickness and the degree of coming to nothing, detects effectively, and the device that uses can be according to the position fast moving of check point, and convenient and swift, workload is little, and it is low to detect cost.
Description of drawings
Fig. 1 is a structural representation of the present invention.
Being labeled as in the 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 accompanying drawing and embodiment the present invention is done further detailed description.
As shown in Figure 1, the position of coming to nothing between steel lining 5 and the concrete 6 is the district 7 of coming to nothing, and the projected area of district 7 on steel lining 5 of coming to nothing is to come to nothing to distinguish 7 area S.Before detection; Possibly exist the position that concrete 6 comes to nothing to knock by manual work in the cavern with special hammer or other instruments; Feel when knocking the sound that sends and knocking judges whether to exist comes to nothing; To judge existing the position preliminary judgement that comes to nothing to come to nothing behind the area, delimit the district 7 of coming to nothing, the district 7 of coming to nothing should comprise the surface area that comes to nothing of preliminary judgement fully.
Settle on steel lining 5 surfaces of district in 7 scopes of coming to nothing to fix transducer 2, transducer 2 is connected with detecting instrument 1 through cable 4, in 7 scopes of district of coming to nothing near transducer 2 layout focus 3.Generally in 0.5m, maximum is no more than 2m to the distance of focus 3 and transducer 2, can guarantee that like this transducer 2 accurately receives the vibration signal that transmits from focus 3.After detecting instrument 1 start was ready to, with focus 3 vibration steel linings 5 surfaces, vibration wave was received by transducer 2, and by detecting instrument 1 record.Vibration wave draws the vibration wave dominant frequency amplitude A of check point through the Computer Processing analysis 0, the 5th wave amplitude value A after the vibration wave dominant frequency 5And parameter values for detection such as vibration wave frequency f.In district's 7 scopes of coming to nothing, move measuring point and focus, detect, obtain many group parameter values for detection, from vibrational waveform, determine the area S that comes to nothing in the district of coming to nothing simultaneously with grid configuration a plurality of measuring point all standings in the district's scope of coming to nothing.With the parameter values for detection and the area S substitution following formula that comes to nothing, the thickness h of coming to nothing of district's 7 each measuring points that can obtain coming to nothing.
h = n S k A 5 A 0 f
In following formula: h is the thickness that comes to nothing (m) of test point, and S is the area (m that comes to nothing 2), k is the area coefficient that comes to nothing, the value of k between 0.2~0.6, A 0Be vibration wave dominant frequency amplitude, A 5Be the 5th wave amplitude value after the vibration wave dominant frequency, f is vibration wave frequency (H Z), n is the calibration parameter; Wherein, come to nothing that to be no less than the vibration wave parameter value that 9 the known district (7) of coming to nothing of coming to nothing the thickness h and the area S that comes to nothing detects definite through trial and error procedure in order to use one group for area coefficient k and calibration parameter n.
One group known, and the district's tentative calculation of coming to nothing of the thickness h and the area S that comes to nothing confirm the to come to nothing method of area coefficient k and calibration parameter n of coming to nothing is: selected known thick, in, approach the thickness h of coming to nothing; The measuring point value in the district of coming to nothing of the corresponding respectively known large, medium and small area S that comes to nothing; From k=0.2, step-length is 0.01, the beginning tentative calculation; To the k=0.6 end, the value of getting the best-fit place is the k and the n value in this district of coming to nothing.
Embodiment of the present invention is not limited to the foregoing description, and the technical scheme that is equal to replacement or equivalent transformation formation that under the prerequisite that does not break away from the principle of the invention, adopts all belongs within protection scope of the present invention.

Claims (1)

1. cavern's steel lining concrete detection method of thickness of coming to nothing, it is characterized in that: this method may further comprise the steps:
1) steel lining (5) surface of cavern's concrete (6) is knocked in manual work, 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 district (7) scope of coming to nothing is settled and is fixed transducer (2); Transducer (2) is connected with detecting instrument (1) through cable (4), in district (7) scope of coming to nothing and transducer (2) the location arrangements focus (3) of 0~2m apart;
3) after detecting instrument (1) start was ready to, with focus (3) vibration steel lining (5) surface, vibration wave was received by transducer (2), and by detecting instrument (1) record;
4) vibration wave draws the vibration wave dominant frequency amplitude of check point through the Computer Processing analysis A 0 ,The 5th wave amplitude value after the vibration wave dominant frequency A 5 And vibration wave frequency fEtc. parameter values for detection;
5) in district (7) scope of coming to nothing, move measuring point and focus (3), carry out a plurality of measuring point all standings with grid configuration in district (7) scope of coming to nothing and detect, obtain many group parameter values for detection, from vibrational waveform, determine the area that comes to nothing in the district (7) of coming to nothing simultaneously S
6) with the parameter values for detection and the area S substitution following formula that comes to nothing, the thickness that comes to nothing of each point of district that can obtain coming to nothing h:
In following formula: hBe the thickness that comes to nothing (m) of test point, SBe the area (m that comes to nothing 2), kBe the area coefficient that comes to nothing, A 0 Be vibration wave dominant frequency amplitude, A 5 Be the 5th wave amplitude value after the vibration wave dominant frequency, f is vibration wave frequency (H Z), nBe the calibration parameter; Wherein, the area coefficient that comes to nothing kWith the calibration parameter nBe the known thickness that comes to nothing that uses one group to be no less than 9 points hConfirm through conventional trial and error procedure with the vibration wave parameter value that the district (7) of coming to nothing of the area S that comes to nothing is detected.
CN201210204680.XA 2012-06-20 2012-06-20 Method for detecting grotto steel lining concrete void thickness Active CN102759744B (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
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
CN112946079A (en) * 2021-03-02 2021-06-11 中国水利水电科学研究院 Void mass energy detection system and method for thick steel shell concrete

Citations (2)

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Publication number Priority date Publication date Assignee Title
JP2001021336A (en) * 1999-07-08 2001-01-26 Token Koei:Kk Method and device for measuring degradation of concrete structure
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

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001021336A (en) * 1999-07-08 2001-01-26 Token Koei:Kk Method and device for measuring degradation of concrete structure
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 (1)

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Title
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Cited By (6)

* Cited by examiner, † Cited by third party
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
CN112946079A (en) * 2021-03-02 2021-06-11 中国水利水电科学研究院 Void mass energy detection system and method for thick steel shell concrete

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