CN103104272A - Lossless dynamic detection device of anchor stock preload and detection method thereof - Google Patents
Lossless dynamic detection device of anchor stock preload and detection method thereof Download PDFInfo
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- CN103104272A CN103104272A CN2013100414939A CN201310041493A CN103104272A CN 103104272 A CN103104272 A CN 103104272A CN 2013100414939 A CN2013100414939 A CN 2013100414939A CN 201310041493 A CN201310041493 A CN 201310041493A CN 103104272 A CN103104272 A CN 103104272A
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- anchor pole
- connecting rod
- anchor
- preload
- anchor stock
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Abstract
The invention discloses a lossless dynamic detection device of anchor stock preload and a detection method of the lossless dynamic detection device of the anchor stock preload. The lossless dynamic detection device of the anchor stock preload is composed of an anchor stock connecting rod, an accelerated speed sensor, a bearing cylinder, a connecting rod tightening nut, a torque wrench, a shock excitation sinking bar, a signal transmission line, and a signal collecting and analyzing appliance, wherein the anchor stock connecting rod is fixedly connected at an exposed end of the anchor stock through threads, the accelerated speed sensor is fixedly connected on the anchor stock connecting rod, and the anchor connecting rod is sleeved with the bearing cylinder. The detection device which is composed of the accelerated speed sensor is used for conducting signal collection, and preload detection of corresponding anchor stock, detection of the anchorage length of the anchor stock and monitoring of work load of the anchor stock can be obtained through calculation. The lossless dynamic detection device of anchor stock preload and the detection method of the lossless dynamic detection device of the anchor stock preload solve the problems that measurement of anchor stock preload through the torque wrench is low in accuracy, the strength of the anchor preload can only be relatively evaluated, and the preload of the anchor stock can not be truly detected.
Description
Technical field
The present invention relates to bolt pretension nondestructive power checkout gear and the method in a kind of mine and tunnel, particularly to the detection of anchor pole or anchor cable pretightning force, anchorage length and service load.
Background technology
Anchor pole is widely used in mine, tunnel surrounding reinforcing and supporting, take colliery as example, China's coal-mine roadway bolt consumption is at least more than 5,000 ten thousand, the pretightning force of anchor pole (anchor cable) is for guaranteeing that anchor pole (rope) supporting effect is most important, whether meet design requirement but detect bolt pretension how accurately, all sidedly, remain at present a difficult problem.In fact, anchor pole, anchor cable for present roadway supported by bolt, impact due to construction quality and construction equipment, there is great difference in the bolt pretension in same tunnel, part bolt pretension does not reach requirement and will cause surrounding rock separation layer, cracked, the final generation that causes the accidents such as lane, roof fall that collapse.Therefore, the pretightning force nondestructive testing of constructed rear anchor pole, anchor cable, grasp the anchor pole after constructing, the pretightning force situation of anchor cable in time, and the anchor pole, the anchor cable that do not reach designing requirement are added and carried, obvious for the safety of coal mines meaning.
At present bolt pretension being detected is mainly to utilize torque wrench to measure the pretightning force of anchor pole, and the friction effect of this detection means owing to being subject between Supporting plate for anchor and coal petrography wall, between anchor pole locking nut and supporting plate affects and make the accuracy of detection not high; And, because the anchor pole classification is more at present, the pitch of its outer end screw thread is also completely different, it is also completely different that the anchor pole that pitch is different applies the required moment of torsion of same pretightning force.In sum, adopt torque wrench to measure the accuracy of bolt pretension not high, size that can only a collection of bolt pretension of relative evaluation, can not truly detect the pretightning force of anchor pole.
Summary of the invention
In order to solve the problems of the technologies described above, the invention provides a kind of simple in structure, bolt pretension nondestructive power checkout gear and detection method thereof that the degree of accuracy is high.
The technical scheme that the present invention solves the problems of the technologies described above is: a kind of bolt pretension inspection nondestructive power is surveyed device by anchor pole connecting rod, acceleration transducer, pressure-bearing cylinder, connecting rod clamp nut, torque wrench, exciting lance, signal transmssion line, signal gathering analysis meter form, wherein said anchor pole connecting rod screw thread is fixed in the exposed junction of anchor pole, acceleration transducer is fixed on the anchor pole connecting rod, suit pressure-bearing cylinder on the anchor pole connecting rod.Described anchor pole connecting rod be provided with internal thread with the anchor pole coupling part, the other end is provided with external screw thread.
A kind of bolt pretension nondestructive power detection method comprises that step is as follows:
1) connect checkout gear: after anchor pole is installed in country rock, the anchor pole connecting rod is socketed on the exposed junction of anchor pole, again at the affixed acceleration transducer of anchor pole connecting rod, the pressure-bearing jacket casing is contained on the anchor pole connecting rod, and clamp nut is tightened on the anchor pole connecting rod, existing with signal transmssion line degree of will speed up sensor and signal gathering analysis meter connection;
2) signals collecting: adopt torque wrench to apply moment to the clamp nut on the anchor pole connecting rod, record torque wrench moment values now, adopt again exciting lance side direction to click the anchor pole connecting rod, the oscillation crosswise signal of degree of will speed up sensor collection is transferred to signal gathering analysis meter through signal transmssion line, obtains the oscillation crosswise frequency values;
3) pretightning force is determined: take above-mentioned moment values as abscissa, applying each time the oscillation crosswise fundamental frequency recorded after moment is the ordinate curve plotting, and the abscissa corresponding to previous point of curve distorted is the pre-fastening moment that bolt pretension is corresponding; Look into figure according to the relation curve of the moment of Laboratory Calibration and pretightning force and obtain the bolt pretension detected value.
The present invention is in the testing process of pretightning force, and to the anchor pole after construction, without damage, nothing is dismantled, and easy to detect, quick, and accuracy of detection is high; Signal sampler can directly be drawn " pretightning force-oscillation crosswise fundamental frequency " curve, and the bolt pretension interpretation is directly perceived, reliable.The present invention has overcome prior art can not intuitively read in down-hole the defect of bolt pretension.
The present invention is based on the Classical Beam model of " end props up admittedly, an end freely-supported ", take at anchor pole exposed junction adjunction connecting rod and pressure-bearing cylinder, when the pressure-bearing cylinder is stressed while reaching bolt pretension, Supporting plate for anchor separates with the country rock wall, and now beam length sports " rock-bolt length L by " anchor pole exposed junction length+connecting rod length "
1+ anchor pole connecting rod length L
2-anchorage length l ", and " end props up admittedly, one end freely-supported " Classical Beam oscillation crosswise theory show: beam length changes the marked change must cause the oscillation crosswise fundamental frequency, therefore adopt the method for the horizontal exciting in permanent position on the connecting rod of anchor pole exposed junction adjunction, make anchor pole expose end carriage and produce the flexural stress ripple, and with the direct acquisition system vibration signal of acceleration transducer, directly extract the anchor rod system fundamental vibration frequency, determine bolt pretension according to the sudden change of anchor rod system fundamental vibration frequency, eliminate the bolt pretension brought because of the systematic error of test macro and detected the inaccuracy problem.
The accompanying drawing explanation
Fig. 1 is structure chart of the present invention.
The specific embodiment
Referring to Fig. 1, the present invention is by anchor pole connecting rod 7, acceleration transducer 9, pressure-bearing cylinder 11, connecting rod clamp nut 8, torque wrench 14, exciting lance 10, signal transmssion line 12, signal gathering analysis meter 13 form, wherein said anchor pole connecting rod 7 is fixed in the exposed junction of anchor pole 3, acceleration transducer 9 is fixed on anchor pole connecting rod 7, suit pressure-bearing cylinder 11 on anchor pole connecting rod 7.
Utilize the step of bolt pretension nondestructive power checkout gear detection bolt pretension as follows:
1) connect checkout gear: at first by anchor pole 3 in anchoring body 2 is fixed on the bolthole 4 on country rock 1, anchor pole 3 exposed junctions are provided with supporting plate 5, supporting plate 5 is fixed on country rock 1 through locking nut 6; After anchor pole 3 is installed in country rock 1, anchor pole connecting rod 7 is socketed on anchor pole 3 exposed junctions, again at the affixed acceleration transducer 9 of anchor pole connecting rod 7, subsequently pressure-bearing cylinder 11 is sleeved on anchor pole connecting rod 7, and clamp nut 8 is tightened on anchor pole connecting rod 7 external screw threads, itself and country rock wall are pressed, thereby make anchor pole 3 exposed junctions produce certain axial stretch-draw, finally by signal transmssion line 12 degree of will speed up sensors 9 and signal gathering analysis meter 13, be communicated with the start signal acquisition and analysis instrument.
2) signals collecting: the pre-fastening moment value M that at first estimates anchor pole
1, by pre-fastening moment value M
1be multiplied by 1.2 8 deciles again; Then take from small to large each decile value as moment applies moment to the clamp nut 8 on anchor pole connecting rod 7, apply each time the oscillation crosswise frequency of after moment, testing anchor rod system; After anchor pole 3 exposed junction reinforcings, adopt exciting lance 10 side direction to click anchor pole connecting rod 7, acceleration transducer 9 collects the oscillation crosswise signal, and be transferred to signal gathering analysis meter 13 storages through signal transmssion line 12, analyze this single signal on signal sampler, and extraction signal fundamental frequency, then once, if signal and fundamental frequency are more consistent, the fundamental frequency average of twice is the vibration frequency value under this moment loading to repeated acquisition.
3) pretightning force is determined.Take above-mentioned moment values as abscissa, and applying each time the oscillation crosswise fundamental frequency recorded after moment is the ordinate curve plotting, and the abscissa corresponding to previous point of curve distorted is the pre-fastening moment that bolt pretension is corresponding; Then look into figure according to the relation curve of the moment of Laboratory Calibration and pretightning force and obtain the bolt pretension detected value, because the horizontal end face of pressure-bearing cylinder, anchor pole connecting rod external screw thread and clamp nut are all the same, its relation curve because of the axial tensile force that applies moment of torsion and produce at the anchor pole exposed junction and moment can accurate calibration.
Utilize the step of bolt pretension nondestructive power detection means measure anchorage length as follows:
Step 1), 2) on;
3) mensuration of anchorage length: the point based on after distorted on " moment-oscillation crosswise fundamental frequency " curve, the pretightning force when pretightning force that these curve point abscissas are corresponding is greater than anchor bolt construction, Supporting plate for anchor separates with the country rock wall, and the beam length L that anchor pole oscillation crosswise fundamental frequency is corresponding is rock-bolt length L
1+ anchor pole connecting rod length L
2-anchorage length l; Beam vibration theory according in mechanics, can obtain oscillation crosswise beam length L and the relational expression L=F (f, N) of beam axial force (being bolt pretension) N, fundamental vibration frequency f, anchorage length l=F (f, the N)-L of " end props up admittedly, an end freely-supported "
1-L
2.
Utilize the step of bolt pretension nondestructive power detection arrangement monitors anchor pole service load as follows:
Step 1), 2) the same;
3) monitoring of anchor pole service load: tighten the clamp nut 8 of this device, Supporting plate for anchor 5 is separated with the country rock wall, when country rock 1 pressure increases, the corresponding increase of anchor pole service load, now adopt exciting lance 10 side direction to click anchor pole connecting rod 7, acceleration transducer 9 collects the oscillation crosswise signal, and be transferred to signal gathering analysis meter 13 storages through signal transmssion line 12, analyze this single signal on signal sampler 13, and extraction signal fundamental frequency, then repeated acquisition once, if signal and fundamental frequency are more consistent, the vibration frequency value that the fundamental frequency average of twice is this detection, then " end props up admittedly in utilization, one end freely-supported " the axial force N of beam and the oscillation crosswise fundamental frequency f of beam, relational expression N=G (the L of beam length L, f) obtain the anchor pole service load, if regularly detect and can realize the monitoring of anchor pole service load.
Claims (3)
1. a bolt pretension nondestructive power checkout gear, it is characterized in that: described anchor pole checkout gear is by anchor pole connecting rod (7), acceleration transducer (9), pressure-bearing cylinder (11), connecting rod clamp nut (8), torque wrench (14), exciting lance (10), signal transmssion line (12), signal gathering analysis meter (13) form, wherein said anchor pole connecting rod (7) is fixed in the exposed junction of anchor pole 3, acceleration transducer (9) is fixed on anchor pole connecting rod 7, the upper suit of anchor pole connecting rod (7) pressure-bearing cylinder (11).
2. bolt pretension nondestructive power checkout gear as claimed in claim 1, is characterized in that, the exposed junction of anchor pole (3) adopts the affixed mode of screw thread to be connected with anchor pole connecting rod (7).
3. a bolt pretension nondestructive power detection method comprises that step is as follows:
1) connect checkout gear: after anchor pole (3) is installed in country rock (1), anchor pole connecting rod (7) is socketed on the exposed junction of anchor pole (3), again at the affixed acceleration transducer of anchor pole connecting rod (7) (9), pressure-bearing cylinder (11) is sleeved on anchor pole connecting rod (7), and clamp nut (8) is tightened on anchor pole connecting rod (7), now use signal transmssion line (12) degree of will speed up sensor (9) and signal gathering analysis meter (13) to be communicated with;
2) signals collecting: adopt torque wrench (14) to apply moment to the clamp nut on the anchor pole connecting rod (8), record torque wrench moment values now, adopt again exciting lance (10) side direction to click anchor pole connecting rod (7), the oscillation crosswise signal that degree of will speed up sensor (9) gathers is transferred to signal gathering analysis meter (13) through signal transmssion line (12), obtains the oscillation crosswise frequency values;
3) pretightning force is determined: take above-mentioned moment values as abscissa, applying each time the oscillation crosswise fundamental frequency recorded after moment is the ordinate curve plotting, and the abscissa corresponding to previous point of curve distorted is the pre-fastening moment that bolt pretension is corresponding; Look into figure according to the relation curve of the moment of Laboratory Calibration and pretightning force and obtain the bolt pretension detected value.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310041493.9A CN103104272B (en) | 2013-02-01 | 2013-02-01 | Lossless dynamic detection device of anchor stock preload and detection method thereof |
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| CN201310041493.9A CN103104272B (en) | 2013-02-01 | 2013-02-01 | Lossless dynamic detection device of anchor stock preload and detection method thereof |
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| CN103104272B CN103104272B (en) | 2015-05-27 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105911146A (en) * | 2016-04-27 | 2016-08-31 | 湖南科技大学 | Apparatus and method for monitoring surrounding rock state of anchorage zone |
| CN105928651A (en) * | 2016-04-22 | 2016-09-07 | 华北水利水电大学 | Experimental method for testing transformation relationship between pretightening torque and pretightening force of anchor bolt |
| CN106401628A (en) * | 2016-12-02 | 2017-02-15 | 大连理工大学 | Tightness degree test anchor rod and tightness degree test system |
| CN107780956A (en) * | 2017-09-01 | 2018-03-09 | 华北科技学院 | A kind of tunnel supporting anchor rod is disrumpent feelings control method and structure |
| CN105911146B (en) * | 2016-04-27 | 2019-07-16 | 湖南科技大学 | A kind of monitoring device and method of anchorage zone state of surrounding rock |
| CN113958349A (en) * | 2021-10-26 | 2022-01-21 | 天地科技股份有限公司 | Anchor rod pre-tightening auxiliary device |
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| US4156236A (en) * | 1978-02-08 | 1979-05-22 | Conkle Ellsworth V | Mine roof movement monitor |
| DE10006197C1 (en) * | 2000-02-11 | 2001-05-17 | Rag Ag | Anchor monitor at mining works has a fixed register with integrated movement sensors at the anchor head with coupling wires to detect movements through shifts in the rock formation |
| CN201635754U (en) * | 2010-01-29 | 2010-11-17 | 西安科技大学 | Force measurement anchor device for analog simulation experiment |
| CA2763910A1 (en) * | 2011-01-10 | 2012-07-10 | Hani Sabri Mitri | Instrumented coupler load cell for rock anchors |
| CN102704972A (en) * | 2012-06-29 | 2012-10-03 | 山东大学 | Prestress measuring anchor rod and using method |
| CN203067004U (en) * | 2013-02-01 | 2013-07-17 | 湖南科技大学 | Nondestructive dynamic detection device for pretightening force of anchor bolt |
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2013
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4156236A (en) * | 1978-02-08 | 1979-05-22 | Conkle Ellsworth V | Mine roof movement monitor |
| DE10006197C1 (en) * | 2000-02-11 | 2001-05-17 | Rag Ag | Anchor monitor at mining works has a fixed register with integrated movement sensors at the anchor head with coupling wires to detect movements through shifts in the rock formation |
| CN201635754U (en) * | 2010-01-29 | 2010-11-17 | 西安科技大学 | Force measurement anchor device for analog simulation experiment |
| CA2763910A1 (en) * | 2011-01-10 | 2012-07-10 | Hani Sabri Mitri | Instrumented coupler load cell for rock anchors |
| CN102704972A (en) * | 2012-06-29 | 2012-10-03 | 山东大学 | Prestress measuring anchor rod and using method |
| CN203067004U (en) * | 2013-02-01 | 2013-07-17 | 湖南科技大学 | Nondestructive dynamic detection device for pretightening force of anchor bolt |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105928651A (en) * | 2016-04-22 | 2016-09-07 | 华北水利水电大学 | Experimental method for testing transformation relationship between pretightening torque and pretightening force of anchor bolt |
| CN105911146A (en) * | 2016-04-27 | 2016-08-31 | 湖南科技大学 | Apparatus and method for monitoring surrounding rock state of anchorage zone |
| CN105911146B (en) * | 2016-04-27 | 2019-07-16 | 湖南科技大学 | A kind of monitoring device and method of anchorage zone state of surrounding rock |
| CN106401628A (en) * | 2016-12-02 | 2017-02-15 | 大连理工大学 | Tightness degree test anchor rod and tightness degree test system |
| CN107780956A (en) * | 2017-09-01 | 2018-03-09 | 华北科技学院 | A kind of tunnel supporting anchor rod is disrumpent feelings control method and structure |
| CN107780956B (en) * | 2017-09-01 | 2019-10-22 | 华北科技学院 | A kind of tunnel supporting anchor rod fracture control method and structure |
| CN113958349A (en) * | 2021-10-26 | 2022-01-21 | 天地科技股份有限公司 | Anchor rod pre-tightening auxiliary device |
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| CN103104272B (en) | 2015-05-27 |
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