CN102155905B - Device and method for nondestructive measurement of anchor rod length - Google Patents
Device and method for nondestructive measurement of anchor rod length Download PDFInfo
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- CN102155905B CN102155905B CN201110074536A CN201110074536A CN102155905B CN 102155905 B CN102155905 B CN 102155905B CN 201110074536 A CN201110074536 A CN 201110074536A CN 201110074536 A CN201110074536 A CN 201110074536A CN 102155905 B CN102155905 B CN 102155905B
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- anchor pole
- frequency signal
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- anchor rod
- tested anchor
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Abstract
The invention discloses a device and a method for nondestructive measurement of anchor rod length; the device comprises a single chip, a measurement frequency signal generator, an impedance match circuit, and a probe in contact with an initial end of a measured anchor rod; an output end of the impedance match circuit is connected with an A/D converter through a peak value detection circuit, an output end of the A/D converter is connected with an input end of the single chip; a measurement probe is directly contacted with the initial end of the measured metallic anchor rod to send a test signal; the test signal is sent into the measured anchor rod from the initial end thereof till to a terminal of the measured anchor rod, then is returned to the initial end of the measured anchor rod from the terminal of the measured anchor rod, a returned electric signal is sent back to a measurement instrument through the probe, a frequency node capable of generating a voltage minimum value can be measured by changing an output frequency of the test signal; therefore, the length of the measured anchor rod can be computed; the device can perform online nondestructive measurement on the anchor rod length; and the device is simple in structure, convenient for operation, rapid and accurate in measurement, practical, reliable, small in volume and low in power consumption.
Description
Technical field
The present invention relates to a kind of rock-bolt length non-destructive measuring method, especially a kind of length non-destructive measuring method that is applicable to the electromagnetic technique of anchor metal.
Background technology
Anchor pole is widely used in the reinforcing and supporting of underground passage and side slope country rock.If the installation length of anchor pole does not reach designing requirement, or fracture etc. takes place in anchor pole in using, and is very big to the anchoring quality influence.Therefore, the Non-Destructive Testing of rock-bolt length is very necessary.But, be used for method such as supercritical ultrasonics technology, the shock stress ripple method etc. of anchor pole Non-Destructive Testing at present, all exist the coupled problem of vibration wave and anchor pole, complicated operation, measurement effect often varies with each individual.
The utilization electromagnetic technique carries out Non-Destructive Testing to anchor pole, comprises following several method at present: the ground radar method is worn in (1).Wearing land mine reaches and is successfully used to survey steel bars in concrete.Even whether anchoring is intact can to confirm reinforcing bar.Its main defective is that consumed power is big and investigation depth is not enough, is generally less than 1m; (2) self-induction method.Adopt a coil to be enclosed within anchor pole and expose the termination, the core of anchor pole as coil.The size of the effect length coefficient of self-induction of anchor pole is measured coefficient of self-induction, can calculate the length of anchor pole.This method practical operation is too complicated, and Practical significance is little; (3) antenna method.Nineteen ninety, the Agnew in South Africa saw steel bars in concrete as an antenna; Laboratory study proves; This method can successfully be tested the length of reinforcing bar; Thereby also can be used for measuring length (Agnew G D.An investigation of methods for producing a non-destructive grouted tendon tester ［ J ］ the .Consultancy report of anchor metal; University of Witwatersrand, Johannesburg, 1990.).But the measurement of antenna energy is in close relations with signal coupling, surrounding medium and measuring position, therefore is difficult to practicality; (4) phase difference method.Phase differential through detecting between incident wave and the reflection wave calculates rock-bolt length.This method with electrical wave measurement's anchor metal, it is comparatively convenient to connect coupling.But mostly at several meters to tens meters anchor pole, need high speed and clock especially accurately for length, implement very difficulty.
Summary of the invention
Technical matters: the purpose of this invention is to provide a kind of method is simple, range is big, low in energy consumption, easy to use rock-bolt length damage-free measuring apparatus and method.
For realizing above-mentioned purpose; Rock-bolt length damage-free measuring apparatus of the present invention, it comprises the single-chip microcomputer that is connected with display, the output terminal of single-chip microcomputer is connected with the survey frequency signal generator; The output terminal of survey frequency signal generator is connected with impedance matching circuit; Impedance matching circuit is provided with and the contacted probe in tested anchor pole top, and the output terminal of impedance matching circuit is connected with A/D converter through peak-detector circuit, and the output terminal of A/D converter is connected with the input end of single-chip microcomputer; Described impedance matching circuit is that one group resistance R 2 and resistance R 3 and series connection is that one group resistance R 1 constitutes with resistance R 4 by series connection mainly, two groups of resistance part short circuit that crosses; Peak-detector circuit is made up of diode D1, resistance R 5 and capacitor C 1; The negative pole of diode D1 is connected with resistance R 4; Diode D1 positive pole connect the input end of resistance R 5, capacitor C 1 and A/D converter respectively, resistance R 5 is connected with resistance R 3 with capacitor C 1, and ground connection; Described single-chip microcomputer model is PIC18F6680, and the model of described survey frequency signal generator is CDCE906, and described A/D converter is that PIC18F6680 inside is integrated.
3. the nondestructive measurement rock-bolt length method of a rock-bolt length is characterized in that may further comprise the steps:
A, probe is contacted with the top of tested anchor pole;
B, power-on make single-chip microcomputer transmit control signal for the survey frequency signal generator;
C, survey frequency signal generator are step-length with 10kHz, and order is sent the test frequency signal of 100kHz to 80MHz, and wherein the output PV of test frequency signal is constant is 3.3V;
D, test frequency signal get into through impedance matching circuit and the probe top from tested anchor pole; The test frequency signal wave inwardly transmits along tested anchor pole top; Arrive the terminal of tested anchor pole when the test frequency signal wave after, produce signal reflex and on tested anchor pole, form standing wave;
The voltage signal that forms standing wave on e, the tested anchor pole transfers to the wavelength of single-chip microcomputer through display demonstration electric signal through probe, impedance matching circuit, peak-detector circuit and A/D converter successively, accomplishes the signals collecting of a rock-bolt length nondestructive measurement;
F, repeating step c, d, e carry out repeatedly the signals collecting of different frequency to tested anchor pole, and write down the standing wave voltage signal and corresponding test frequency signal that collects each time, the size of the standing wave magnitude of voltage of more repeatedly gathering;
G, get the test frequency f that produces minimum standing wave voltage, calculate the length L of tested anchor pole through formula: L=V/ (4f); In the formula: f records the test frequency that produces minimum standing wave voltage, and V is the velocity of propagation of electric wave in tested anchor pole.
Beneficial effect: the present invention can carry out online nondestructive measurement to anchor metal length, and through the direct contact sending test signal of measuring probe and tested anchor metal top, test signal gets into the terminal until tested anchor pole from the top of tested anchor pole; Return the top of tested anchor pole again by the terminal of tested anchor pole; Because measuring-signal is an electric signal, the electric signal that returns is sent surveying instrument back to again through probe, through changing the output frequency of test signal; Measure the frequency node that produces voltage minimum; Can calculate the length of the tested anchor pole that is embedded in the rock mass several meters to tens meters, and the measuring-signal waveform is not strict with, measure when using and anchor pole is of coupled connections very convenient; Meet the essential safety requirement, be convenient in the subsurface environment of colliery, use.It is simple in structure, easy to operate, measuring and calculating quick and precisely, but practical reliable volume is little, low in energy consumption, has practicality widely.
Description of drawings
Fig. 1 is a theory structure block diagram of the present invention.
Among Fig. 1: 1-display, 2-single-chip microcomputer, 3-survey frequency signal generator, 4-impedance matching circuit, 5-probe, the tested anchor pole of 6-, 7-peak-detector circuit, 8-A/D converter.
Fig. 2 is impedance matching circuit of the present invention and peak-detector circuit principle assumption diagram.
Fig. 3 is a tested rock-bolt length test frequency wavelength principle schematic of the present invention.
Among Fig. 3: the length of the tested anchor pole of L-, the top of the tested anchor pole of A-, the terminal of the tested anchor pole of B-, λ
1, λ
2, λ
3, λ
4-wavelength.
Embodiment
Below in conjunction with accompanying drawing one embodiment of the present of invention are done further to describe:
Shown in Figure 1, rock-bolt length damage-free measuring apparatus of the present invention mainly is made up of display 1, single-chip microcomputer 2, survey frequency signal generator 3, impedance matching circuit 4, probe 5, tested anchor pole 6, peak-detector circuit 7, A/D converter 8.Wherein: the model of single-chip microcomputer 2 is PIC18F6680; The output terminal of single-chip microcomputer 2 is connected with the input end of survey frequency signal generator 3, and the model of survey frequency signal generator 3 is CDCE906, and the output terminal of survey frequency signal generator 3 is connected with the input end of impedance matching circuit 4; Be connected with probe 5 on the impedance matching circuit 4; The output terminal of impedance matching circuit 4 is connected with the input end of peak-detector circuit 7, and the output terminal of peak-detector circuit 7 is connected with the input end of A/D converter 8, and A/D converter 8 is that PIC18F6680 inside is integrated; The output terminal of A/D converter 8 is connected with the input end of single-chip microcomputer 2, and the output terminal of single-chip microcomputer 2 is connected with display 1.
Shown in Figure 2; Impedance matching circuit 4 is that one group resistance R 2 and resistance R 3 and series connection is that one group resistance R 1 constitutes with resistance R 4 by series connection mainly; Two groups of resistance part short circuit that crosses, resistance R 1 one ends connect survey frequency signal generator 3, resistance R 2 one end linking probes 5; Peak-detector circuit 7 is made up of diode D1, resistance R 5 and capacitor C 1; The negative pole of diode D1 is connected with resistance R 4 in the impedance matching circuit 4; Diode D1 positive pole connect the input end of resistance R 5, capacitor C 1 and A/D converter 8 respectively; Resistance R 5 and capacitor C 1 are connected with resistance R 3 in the impedance matching circuit 4, and ground connection.
Rock-bolt length non-destructive measuring method of the present invention:
A, probe 5 is contacted with the top A of tested anchor pole 6;
B, power-on transmit control signal for survey frequency signal generator 3 through single-chip microcomputer 2;
C, survey frequency signal generator 3 are step-length with 10kHz, and order is sent the test frequency signal of 100kHz to 80MHz, and wherein the output PV of test frequency signal is constant is 3.3V;
D, test frequency signal get into through impedance matching circuit 4 and the probe 5 top A from tested anchor pole 6; As shown in Figure 3; The test frequency signal wave inwardly transmits along the top A of tested anchor pole 6; Arrive the terminal B of tested anchor pole 6 when the test frequency signal wave after, produce the voltage signal reflection wave and on tested anchor pole 6, form standing wave;
The voltage signal that forms standing wave on e, the tested anchor pole 6 transfers to single-chip microcomputer 2 through probe 5, impedance matching circuit 4, peak-detector circuit 7 and A/D converter 8 successively, accomplishes the signals collecting that primary measured rock-bolt length L measures;
F, repeating step c, d, e carry out repeatedly the signals collecting of different frequency to tested anchor pole 6, and write down the standing wave voltage signal and corresponding test frequency signal that collects each time, the size of the standing wave magnitude of voltage of more repeatedly gathering; Along with the frequency of survey frequency signal constantly increases the wavelength X of the electric signal frequency that produces
1, λ
2, λ
3, λ
4Constantly change;
G, get the test frequency f that produces minimum standing wave voltage; According to the Electromagnetic Standing Waves principle; When rock-bolt length L just equal the test signal wavelength period 1/4 the time, λ/4 transmission lines that rock-bolt length equivalence is opened a way for the terminal, its top A is the node of voltage standing wave(VSW); As shown in Figure 3, be the wavelength X of four kinds of test frequencies
1, λ
2, λ
3, λ
4Figure, when rock-bolt length L obviously greater than λ
1/ 4 o'clock, its wavelength X
1Satisfy not produce the wavelength of standing wave node condition, when rock-bolt length L equally obviously greater than wavelength X
3/ 4, i.e. L>λ
3/ 4 o'clock, wavelength X
3For not satisfying the wavelength that produces the standing wave node condition, L is significantly less than wavelength X when rock-bolt length
4/ 4, i.e. L<λ
4/ 4 o'clock, wavelength X
4Be similarly and do not satisfy the wavelength that produces the standing wave node condition; Equal wavelength X and work as rock-bolt length L
2/ 4, i.e. L=λ
2/ 4 o'clock, the voltage standing wave(VSW) node appearred in the top A of tested anchor pole 6, and this moment, measured voltage was minimum value, wavelength X
2The test frequency f that pairing test frequency signal is minimum standing wave voltage can calculate the length L of tested anchor pole 6 through formula: L=V/ (4f); In the formula: f records the test frequency that produces minimum standing wave voltage, and V is the velocity of propagation of electric wave in tested anchor pole.
Claims (3)
1. rock-bolt length damage-free measuring apparatus; It is characterized in that: it comprises the single-chip microcomputer (2) that is connected with display (1); The output terminal of single-chip microcomputer (2) is connected with survey frequency signal generator (3); The output terminal of survey frequency signal generator (3) is connected with impedance matching circuit (4); Impedance matching circuit (4) is provided with and the contacted probe in tested anchor pole (6) top (5), and the output terminal of impedance matching circuit (4) is connected with A/D converter (8) through peak-detector circuit (7), and the output terminal of A/D converter (8) is connected with the input end of single-chip microcomputer (2); Described impedance matching circuit (4) is that one group resistance R 2 and resistance R 3 and series connection is that one group resistance R 1 constitutes with resistance R 4 by series connection, two groups of resistance part short circuit that crosses; Peak-detector circuit (7) is made up of diode D1, resistance R 5 and capacitor C 1; The negative pole of diode D1 is connected with resistance R 4; Diode D1 positive pole connect the input end of resistance R 5, capacitor C 1 and A/D converter (8) respectively, resistance R 5 is connected with resistance R 3 with capacitor C 1, and ground connection.
2. rock-bolt length damage-free measuring apparatus according to claim 1; It is characterized in that; Described single-chip microcomputer (2) model is PIC18F6680, and the model of described survey frequency signal generator (3) is CDCE906, and described A/D converter (8) is that PIC18F6680 inside is integrated.
One kind according to claim 1 the device nondestructive measurement rock-bolt length method, it is characterized in that may further comprise the steps:
A, the top of probe (5) with tested anchor pole (6) is contacted;
B, power-on make single-chip microcomputer (2) transmit control signal for survey frequency signal generator (3);
C, survey frequency signal generator (3) are step-length with 10kHz, and order is sent the test frequency signal of 100kHz to 80MHz, and wherein the output PV of test frequency signal is constant is 3.3V;
D, test frequency signal get into through impedance matching circuit (4) and probe (5) top (A) from tested anchor pole (6); The test frequency signal wave is (A) inwardly transmission along tested anchor pole top; Arrive the terminal (B) of tested anchor pole (6) when the test frequency signal after, produce the voltage signal reflection wave and go up the formation standing wave at tested anchor pole (6);
E, tested anchor pole (6) are gone up the voltage signal that forms standing wave and are transferred to single-chip microcomputer (2) through probe (5), impedance matching circuit (4), peak-detector circuit (7) and A/D converter (8) successively; Through the wavelength of display (1) demonstration electric signal, accomplish the signals collecting of a rock-bolt length nondestructive measurement;
F, repeating step c, d, e carry out repeatedly the signals collecting of different frequency to tested anchor pole (6), and write down the standing wave voltage signal and corresponding test frequency signal that collects each time, the size of the standing wave magnitude of voltage of more repeatedly gathering;
G, get the test frequency f that produces minimum standing wave voltage, calculate the length L of tested anchor pole (6) by formula: L=V/ (4f); In the formula: f records the test frequency that produces minimum standing wave voltage, and V is the velocity of propagation of electric wave in tested anchor pole.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110074536A CN102155905B (en) | 2011-03-28 | 2011-03-28 | Device and method for nondestructive measurement of anchor rod length |
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| CN201110074536A CN102155905B (en) | 2011-03-28 | 2011-03-28 | Device and method for nondestructive measurement of anchor rod length |
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| CN102155905B true CN102155905B (en) | 2012-10-24 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103292680B (en) * | 2013-05-30 | 2016-03-16 | 中铁西北科学研究院有限公司 | A kind of method of novel electricity Non-Destructive Testing rock-bolt length and pick-up unit |
| CN103278081B (en) * | 2013-05-30 | 2016-03-16 | 中铁西北科学研究院有限公司 | Potential difference type rock-bolt length lossless detection method and pick-up unit |
| CN104406549B (en) * | 2014-12-05 | 2017-02-22 | 桂林电子科技大学 | Anchor rod length measuring method and anchor rod length measuring instrument |
| EP3504144A1 (en) * | 2016-08-24 | 2019-07-03 | Inventio AG | Method and testing device for determining a state of a suspension traction means of an elevator system |
| CN111878169B (en) * | 2020-06-11 | 2022-06-28 | 中铁十四局集团第三工程有限公司 | Rock anchor rod capable of measuring internal deformation of tunnel surrounding rock and working method |
| CN114200016B (en) * | 2021-10-18 | 2024-04-16 | 中国科学院武汉岩土力学研究所 | Double-channel nondestructive testing method and related equipment for rock anchor rod |
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