CN203067004U - Nondestructive dynamic detection device for pretightening force of anchor bolt - Google Patents
Nondestructive dynamic detection device for pretightening force of anchor bolt Download PDFInfo
- Publication number
- CN203067004U CN203067004U CN 201320059638 CN201320059638U CN203067004U CN 203067004 U CN203067004 U CN 203067004U CN 201320059638 CN201320059638 CN 201320059638 CN 201320059638 U CN201320059638 U CN 201320059638U CN 203067004 U CN203067004 U CN 203067004U
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- CN
- China
- Prior art keywords
- anchor pole
- connecting rod
- anchor bolt
- anchor
- pretightening force
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
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Abstract
The utility model discloses a nondestructive dynamic detection device for a pretightening force of an anchor bolt. The nondestructive dynamic detection device for the pretightening force of the anchor bolt comprises an anchor bolt connecting rod (7), an acceleration sensor (9), a pressure bearing cylinder (11), a connecting rod tight nut (8), a torque wrench (14), a shock excitation sinking rod (10), a signal transmission line (12), and a signal acquisition analyzer (13), wherein the anchor bolt connecting rod (7) is fixedly connected with an exposure end of the anchor bolt (3); the acceleration sensor (9) is fixedly connected with the anchor bolt connecting rod (7); and the pressure bearing cylinder (11) is mounted on the anchor bolt connecting rod (7) in a sleeving manner. The nondestructive dynamic detection device solves the problems that the accuracy of measuring the pretightening force of the anchor bolt with the torque wrench is not high, only the magnitude of the pretightening force of a batch of anchor bolts can be evaluated relatively, and the pretightening forces of the anchor bolts cannot be detected actually.
Description
Technical field
The utility model relates to the bolt pretension nondestructive power checkout gear in a kind of mine and tunnel.
Background technology
Anchor pole is widely used in mine, tunnel surrounding reinforcing and the supporting, be example with the colliery, 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 a difficult problem at present.In fact, anchor pole, anchor cable for present roadway supported by bolt, because the influence of 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 anchor pole after constructing, the pretightning force situation of anchor cable are in time grasped in the pretightning force nondestructive testing of construct back anchor pole, anchor cable, the anchor pole, the anchor cable that do not reach designing requirement are added carried, and be obvious for the safety of coal mines meaning.
At present bolt pretension being detected mainly is to utilize torque wrench to measure the pretightning force of anchor pole, this detection means owing to be subjected between Supporting plate for anchor and coal petrography wall, that friction effect between anchor pole locking nut and supporting plate influences the accuracy that makes detection is not high; And because the anchor pole classification is more at present, the pitch of its outer end screw thread is also completely different, and 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, it is not high to adopt torque wrench to measure the accuracy of bolt pretension, and size that can only a collection of bolt pretension of relative evaluation can not truly detect the pretightning force of anchor pole.
The utility model content
In order to solve the problems of the technologies described above, the utility model provides a kind of bolt pretension nondestructive power checkout gear that is directly used in after the construction.
The technical solution of the utility model is: a kind of bolt pretension nondestructive power is surveyed device, formed by anchor pole connecting rod, acceleration transducer, pressure-bearing tube, connecting rod clamp nut, torque wrench, exciting lance, signal transmssion line, signal gathering analysis meter, 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 tube on the anchor pole connecting rod.
The utility model does not have damage to the anchor pole after the construction in the testing process of pretightning force, do not have dismounting, and easy to detect, quick, the accuracy of detection height; Signal sampler can directly be drawn " pretightning force-oscillation crosswise fundamental frequency " curve, and the bolt pretension interpretation is directly perceived, reliable.The prior art that overcome the utility model can not intuitively not read the defective of bolt pretension in the down-hole.
The utility model 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 tube, when the pressure-bearing tube is stressed when reaching bolt pretension, Supporting plate for anchor separates with the country rock wall, and this moment, beam length sported " 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; so 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; bolt pretension is determined in the sudden change according to the anchor rod system fundamental vibration frequency, eliminated the bolt pretension detection inaccuracy of bringing because of the systematic error of test macro.
Description of drawings
Fig. 1 is structure chart of the present utility model.
The specific embodiment
Below in conjunction with accompanying drawing the utility model is further described.
Referring to Fig. 1, the utility model is by anchor pole connecting rod 7, acceleration transducer 9, pressure-bearing tube 11, connecting rod clamp nut 8, torque wrench 14, exciting lance 10, signal transmssion line 12, signal gathering analysis meter 13 are formed, wherein said anchor pole connecting rod 7 is fixed in the exposed junction of anchor pole 3, acceleration transducer 9 is fixed on the anchor pole connecting rod 7, suit pressure-bearing tube 11 on the anchor pole connecting rod 7.
Utilize the process of the pre-police strength of bolt pretension nondestructive power checkout gear detection anchor pole as follows:
1) connect checkout gear: at first with anchor pole 3 in anchoring body 2 is fixed on bolthole 4 on the country rock 1, anchor pole 3 exposed junctions are provided with supporting plate 5, supporting plate 5 is fixed on the country rock 1 through locking nut 6; After anchor pole 3 installed in country rock 1, anchor pole connecting rod 7 is socketed on anchor pole 3 exposed junctions, again at anchor pole connecting rod 7 affixed acceleration transducers 9, subsequently pressure-bearing tube 11 is sleeved on the anchor pole connecting rod 7, and clamp nut 8 tightened at 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, be communicated with the start signal acquisition and analysis instrument with signal transmssion line 12 degree of will speed up sensors 9 and signal gathering analysis meter 13 at last.
2) signals collecting: the pre-fastening moment value M that at first estimates anchor pole
1, with pre-fastening moment value M
1Multiply by 1.2 8 five equilibriums again; Waiting score value with each from small to large then is that moment applies moment to the clamp nut 8 on the anchor pole connecting rod 7, applies the oscillation crosswise frequency of testing anchor rod system after the moment each time; Adopt exciting lance 10 side direction to click anchor pole connecting rod 7 after the anchor pole 3 exposed junction reinforcings, acceleration transducer 9 collects the oscillation crosswise signal, and be transferred to signal gathering analysis meter 13 storage through signal transmssion line 12, analyze this single signal at signal sampler, and extraction signal fundamental frequency, then repeated acquisition once, if signal and fundamental frequency are consistent, then twice fundamental frequency average is the vibration frequency value under this moment loading.
3) pretightning force is determined.Be abscissa with above-mentioned moment values, applying the oscillation crosswise fundamental frequency that records after the moment each time is the ordinate curve plotting, and the abscissa that the previous correspondence of distortion takes place curve is the pre-fastening moment of bolt pretension correspondence; The relation curve of the moment of demarcating according to the laboratory and pretightning force is looked into figure and is obtained the bolt pretension detected value then, because the horizontal end face of pressure-bearing tube, anchor pole connecting rod external screw thread and clamp nut all are the same, it can accurately be demarcated in the axial tensile force of anchor pole exposed junction generation and the relation curve of moment because applying moment of torsion.
Utilize bolt pretension nondestructive power checkout gear as follows to the determination step of anchorage length:
Step 1), 2) the same;
3) mensuration of anchorage length: the point after distorting on " moment-oscillation crosswise fundamental frequency " curve, the pretightning force of the pretightning force of these curve point abscissa correspondences during greater than anchor bolt construction, then Supporting plate for anchor separates with the country rock wall, and namely the beam length L of anchor pole oscillation crosswise fundamental frequency correspondence is rock-bolt length L
1+ anchor pole connecting rod length L
2-anchorage length l; Beam vibration theory according in the mechanics, can obtain the oscillation crosswise beam length L of " end props up admittedly, an end freely-supported " and the relational expression L=F of beam axial force N, fundamental vibration frequency f (f, N), then anchorage length l=F (f, N)-L
1-L
2
Utilize bolt pretension nondestructive power checkout gear as follows to the monitoring step of anchor pole service load:
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, adopt exciting lance 10 side direction to click anchor pole connecting rod 7 this moment, acceleration transducer 9 collects the oscillation crosswise signal, and be transferred to signal gathering analysis meter 13 storage through signal transmssion line 12, analyze this single signal at signal sampler 13, and extraction signal fundamental frequency, repeated acquisition once then, if signal and fundamental frequency are consistent, then twice fundamental frequency average is the vibration frequency value of this time detection, utilize " end props up admittedly; an end freely-supported " the axial force N of beam and the oscillation crosswise fundamental frequency f of beam then, relational expression N=G (the L of beam length L, f) obtain the anchor pole service load, if regularly detect the monitoring that then can realize the anchor pole service load.
Claims (2)
1. 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 tube (11), connecting rod clamp nut (8), torque wrench (14), exciting lance (10), signal transmssion line (12), signal gathering analysis meter (13) are formed, wherein said anchor pole connecting rod (7) is fixed in the exposed junction of anchor pole (3), acceleration transducer (9) is fixed on the anchor pole connecting rod (7), and anchor pole connecting rod (7) is gone up suit pressure-bearing tube (11).
2. bolt pretension nondestructive power checkout gear as claimed in claim 1 is characterized in that, anchor pole (3) adopts with anchor pole connecting rod (7) and is threaded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320059638 CN203067004U (en) | 2013-02-01 | 2013-02-01 | Nondestructive dynamic detection device for pretightening force of anchor bolt |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320059638 CN203067004U (en) | 2013-02-01 | 2013-02-01 | Nondestructive dynamic detection device for pretightening force of anchor bolt |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203067004U true CN203067004U (en) | 2013-07-17 |
Family
ID=48765813
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320059638 Withdrawn - After Issue CN203067004U (en) | 2013-02-01 | 2013-02-01 | Nondestructive dynamic detection device for pretightening force of anchor bolt |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203067004U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103104272A (en) * | 2013-02-01 | 2013-05-15 | 湖南科技大学 | Lossless dynamic detection device of anchor stock preload and detection method thereof |
| CN105067170A (en) * | 2015-08-06 | 2015-11-18 | 太原理工大学 | Device and method for monitoring axial force of anchor rod by utilizing hammering acoustic method |
| CN111622790A (en) * | 2020-06-11 | 2020-09-04 | 中国矿业大学 | Intelligent and rapid application method for prestress of anchor rod |
-
2013
- 2013-02-01 CN CN 201320059638 patent/CN203067004U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103104272A (en) * | 2013-02-01 | 2013-05-15 | 湖南科技大学 | Lossless dynamic detection device of anchor stock preload and detection method thereof |
| CN103104272B (en) * | 2013-02-01 | 2015-05-27 | 湖南科技大学 | Lossless dynamic detection device of anchor stock preload and detection method thereof |
| CN105067170A (en) * | 2015-08-06 | 2015-11-18 | 太原理工大学 | Device and method for monitoring axial force of anchor rod by utilizing hammering acoustic method |
| CN111622790A (en) * | 2020-06-11 | 2020-09-04 | 中国矿业大学 | Intelligent and rapid application method for prestress of anchor rod |
| CN111622790B (en) * | 2020-06-11 | 2021-08-03 | 中国矿业大学 | Intelligent and rapid application method for prestress of anchor rod |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130717 Effective date of abandoning: 20150527 |
|
| RGAV | Abandon patent right to avoid regrant |