CN104697673A - Method for testing axial force of anchor rod - Google Patents
Method for testing axial force of anchor rod Download PDFInfo
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- CN104697673A CN104697673A CN201510049704.2A CN201510049704A CN104697673A CN 104697673 A CN104697673 A CN 104697673A CN 201510049704 A CN201510049704 A CN 201510049704A CN 104697673 A CN104697673 A CN 104697673A
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- pallet
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a method for testing axial force of an anchor rod. The method for testing the axial force of the anchor rod is characterized by comprising the following steps: (1) firstly, testing mechanics and deformation characteristics of a tray, and obtaining a displacement curve of the load of the tray; (2) mounting the anchor rod, a steel cushion plate and the tray; and then fastening a nut, and measuring a vertical distance between outside face of the nut and outside face of the steel cushion plate; (3) after stressing on the anchor rod, measuring the vertical distance between the outside face of the nut and outside face of the steel cushion plate again, and thereby obtaining relative displacement generated by pressing the tray; (4) according to a displacement curve of the tray load, obtaining the axial force of the anchor rod. According to the relationship between the tray load and deformation, the testing of the tray load is transformed to be measurement of displacement caused by pressing the tray, and thereby the axial force of the anchor rod is indirectly obtained; the testing concept of a traditional method is broken through, so that the axial force of the anchor rod is simply and easily tested, and the testing cost is largely reduced.
Description
Technical field
The present invention relates to anchor pole health detection field, specifically a kind of new anchor axial force method of testing.
Background technology
In recent years, anchor pole obtains a wide range of applications in underground engineering support field, has played vital role for reduction support cost and minimizing accident.Because anchor pole is embedded in country rock inside, belong to concealed structure, its Gernral Check-up and support action evaluation comparatively difficult.In order to assess support action and the health status of anchor pole, generally using anchor axial force as important evaluation index, but the test of anchor axial force is but very difficult.The anchor axial force method of testing adopted both at home and abroad at present mainly comprises: stain measuring technology, pressure transducer method of testing and type vibration wire anchor ergometer.
Stain measuring technology refers to before rockbolt installation, in bolt shaft to laying foil gauge or fiber grating, produces certain distortion, can measure the axial strain of anchor pole, according to the axle power of the strain calculation anchor pole recorded after rockbolt stress.The foil gauge adopted in this method and fiber grating very easily damage, and require higher to surrounding environment, and measurement result is unstable, and measurement result generally can only be as a reference.In addition, fiber grating strain cost of testing system is higher.
Pressure transducer method of testing refers to installs a pressure transducer in advance at anchor rod pallet board place, directly tests anchor axial force by pressure transducer.This method measuring accuracy can ensure, but cost is higher, and the cost of single pressure sensor reaches unit up to ten thousand, can cause great waste if do not recycled, and the words of recovery then can cause anchor pole to lose efficacy, and threatens engineering safety.
First bolt deformation is passed to vibratory string by type vibration wire anchor ergometer, thus changes the vibration frequency of vibratory string.The distortion of vibratory string can be obtained by vibratory string frequency detecting, and then obtain the distortion of anchor pole, and then try to achieve the axle power of anchor pole.This method needs to be welded on anchor pole by the two ends of vibratory string in advance, not only complicated operation, and welding quality is difficult to ensure, but also considerably increases the installation difficulty of anchor pole.
Summary of the invention
Task of the present invention is to provide a kind of anchor axial force method of testing, the measurement that the method is out of shape based on pallet, obtains pallet force-bearing situation, and then tries to achieve the stressing conditions of anchor pole, the method operation is extremely simple, is expected to solve the problem that the test of current anchor axial force is difficult, cost is high.
Its technical solution is: a kind of anchor axial force method of testing, is characterized in that comprising the following steps:
1. the mechanics of pallet and deformation characteristic test; In the direction perpendicular to card, compression experiment is carried out to the pallet of a certain model by pressure testing machine, obtain the relation between pallet institute's bearing load and the displacement of generation, i.e. the load-displacement curve of pallet;
2. skyhook; Employing conventional method installs billet and pallet, then clamp nut after the grouted part of anchor pole is fixed on anchor hole successively, makes country rock and billet, billet and pallet, distinguishes close contact between pallet and nut; The vertical range between nut lateral surface and billet lateral surface is measured by the measuring equipment such as auxiliary stand and vernier caliper;
3. by applying pretension or after country rock deforms after a while, anchor pole starts stressed and plays support action, anchor axial force is by nut retroaction on pallet, and stressed rear generations of pallet is out of shape; Again measure the vertical range between nut lateral surface and billet lateral surface by the measuring equipment such as auxiliary stand and vernier caliper, thus obtain the relative displacement of pallet pressurized generation;
4. according to pallet load-displacement curve that 1. step records, and the relative displacement that the pallet pressurized that 3. records of step produces, conversion can obtain pallet load, and this load equals the axle power of anchor pole.
Above-mentioned pallet is bowl-type pallet, and its bearing capacity is greater than the greatest axis power of anchor pole, and the pallet of same model has identical size and mechanical property, and namely load-displacement curve is identical.
Above-mentioned billet is the steel plate of surfacing, middle with hole, can not produce obvious distortion under pressure pallet effect, its role is to the relative displacement of being convenient to measure pallet generation.
Ultimate principle of the present invention is: because the axle power of directly testing anchor pole is comparatively difficult, and the test of pallet load, according to the relation between pallet load and distortion, is converted into the measurement of the displacement that pallet pressurized produces, and then indirectly tries to achieve the axle power of anchor pole by the application.
The invention has the beneficial effects as follows: the anchor axial force method of testing that the application proposes has sufficient theoretical foundation, breach the test theory of classic method, anchor axial force is tested and becomes simple, greatly reduce testing cost, big-bang testing anchor axial force is made to become possibility, for the dynamic shoring great significance for design of engineering site.
Accompanying drawing explanation
Below in conjunction with accompanying drawing and embodiment, the invention will be further described:
Fig. 1 is the structural principle schematic diagram of anchor axial force method of testing of the present invention;
Fig. 2 for structure shown in Fig. 1 deform after schematic diagram;
Fig. 3 is the load-displacement curve figure of a certain class pallet.
Embodiment
By reference to the accompanying drawings 1, a kind of anchor axial force method of testing, comprises the following steps:
1. the mechanics of pallet 1 and deformation characteristic test; In the direction perpendicular to card, compression experiment is carried out to the pallet of a certain model by pressure testing machine, obtain the relation between pallet institute's bearing load and the displacement of generation, i.e. the load-displacement curve of pallet, as shown in Figure 3.
2. skyhook 2; Employing conventional method installs billet 3 and pallet 1, then clamp nut 4 after the grouted part of anchor pole is fixed on anchor hole successively, makes country rock 5 and billet 3, billet 3 and pallet 1, distinguishes close contact between pallet 1 and nut 4; The vertical range L0 between nut lateral surface and billet lateral surface is measured by the measuring equipment such as auxiliary stand and vernier caliper;
3. by applying pretension or after country rock deforms after a while, anchor pole starts stressed F and plays support action, anchor axial force is by nut retroaction on pallet, and stressed rear generations of pallet is out of shape, as shown in Figure 2; Again measure the vertical range L1 between nut lateral surface and billet lateral surface by the measuring equipment such as auxiliary stand and vernier caliper, thus obtain the relative displacement of pallet pressurized generation;
4. according to pallet load-displacement curve that 1. step records, and the relative displacement that the pallet pressurized that 3. records of step produces, conversion can obtain pallet load, and this load equals the axle power of anchor pole.
Above-mentioned pallet is bowl-type pallet, and its bearing capacity is greater than the greatest axis power of anchor pole, and the pallet of same model has identical size and mechanical property, and namely load-displacement curve is identical.
Above-mentioned billet is the steel plate of surfacing, middle with hole, can not produce obvious distortion under pressure pallet effect, its role is to the relative displacement of being convenient to measure pallet generation.
The above embodiment, the just one of the embodiment that the present invention is more preferably concrete, the usual change that those skilled in the art carries out within the scope of technical solution of the present invention and replacement all should be included in protection scope of the present invention.
Claims (1)
1. an anchor axial force method of testing, is characterized in that comprising the following steps:
1. the mechanics of pallet and deformation characteristic test; In the direction perpendicular to card, compression experiment is carried out to the pallet of a certain model by pressure testing machine, obtain the relation between pallet institute's bearing load and the displacement of generation, i.e. the load-displacement curve of pallet;
2. skyhook; Employing conventional method installs billet and pallet, then clamp nut after the grouted part of anchor pole is fixed on anchor hole successively, makes country rock and billet, billet and pallet, distinguishes close contact between pallet and nut; The vertical range between nut lateral surface and billet lateral surface is measured by the measuring equipment such as auxiliary stand and vernier caliper;
3. by applying pretension or after country rock deforms after a while, anchor pole starts stressed and plays support action, anchor axial force is by nut retroaction on pallet, and stressed rear generations of pallet is out of shape; Again measure the vertical range between nut lateral surface and billet lateral surface by the measuring equipment such as auxiliary stand and vernier caliper, thus obtain the relative displacement of pallet pressurized generation;
according to pallet load-displacement curve that 1. step records, and the relative displacement that the pallet pressurized that 3. records of step produces, conversion can obtain pallet load, and this load equals the axle power of anchor pole;
Described pallet is bowl-type pallet, and its bearing capacity is greater than the greatest axis power of anchor pole, and the pallet of same model has identical size and mechanical property, and namely load-displacement curve is identical;
Described billet is the steel plate of surfacing, middle with hole, can not produce obvious distortion under pressure pallet effect, its role is to the relative displacement of being convenient to measure pallet generation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510049704.2A CN104697673A (en) | 2015-02-01 | 2015-02-01 | Method for testing axial force of anchor rod |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510049704.2A CN104697673A (en) | 2015-02-01 | 2015-02-01 | Method for testing axial force of anchor rod |
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| Publication Number | Publication Date |
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| CN104697673A true CN104697673A (en) | 2015-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201510049704.2A Pending CN104697673A (en) | 2015-02-01 | 2015-02-01 | Method for testing axial force of anchor rod |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106523008A (en) * | 2016-12-23 | 2017-03-22 | 山东科技大学 | anchor rod stress measuring reading warning device and usage method |
| CN106644228A (en) * | 2017-02-14 | 2017-05-10 | 重庆科技学院 | Device and method for measuring passively produced axial force of beam |
| CN106679856A (en) * | 2016-12-02 | 2017-05-17 | 西南交通大学 | Testing device for stress on base plate of anchor rod |
| CN106768564A (en) * | 2017-03-06 | 2017-05-31 | 山东科技大学 | A kind of multisection type anchor rod force-measuring device and application method |
| CN109060525A (en) * | 2018-07-02 | 2018-12-21 | 中国科学院武汉岩土力学研究所 | The test method and device of drawing process force analysis |
| CN109281694A (en) * | 2018-10-22 | 2019-01-29 | 山东建筑大学 | Can the self-locking of real-time display anchor pole or anchor cable axle power allow pressure pallet and operating method |
| CN114608972A (en) * | 2022-02-24 | 2022-06-10 | 中煤科工开采研究院有限公司 | Anchor rod supporting plate mechanical property testing device and testing method |
| WO2022201897A1 (en) * | 2021-03-26 | 2022-09-29 | 株式会社日立製作所 | Bolt axial force examination method and bolt axial force examination device |
-
2015
- 2015-02-01 CN CN201510049704.2A patent/CN104697673A/en active Pending
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106679856A (en) * | 2016-12-02 | 2017-05-17 | 西南交通大学 | Testing device for stress on base plate of anchor rod |
| CN106523008A (en) * | 2016-12-23 | 2017-03-22 | 山东科技大学 | anchor rod stress measuring reading warning device and usage method |
| CN106523008B (en) * | 2016-12-23 | 2023-07-21 | 山东科技大学 | Anchor rod stress measuring, reading and early warning device and use method |
| CN106644228B (en) * | 2017-02-14 | 2022-10-18 | 重庆科技学院 | Device and method for measuring passive generated axial force of structural beam |
| CN106644228A (en) * | 2017-02-14 | 2017-05-10 | 重庆科技学院 | Device and method for measuring passively produced axial force of beam |
| CN106768564A (en) * | 2017-03-06 | 2017-05-31 | 山东科技大学 | A kind of multisection type anchor rod force-measuring device and application method |
| CN109060525B (en) * | 2018-07-02 | 2020-06-30 | 中国科学院武汉岩土力学研究所 | Test method and device for stress analysis in drawing process |
| CN109060525A (en) * | 2018-07-02 | 2018-12-21 | 中国科学院武汉岩土力学研究所 | The test method and device of drawing process force analysis |
| CN109281694A (en) * | 2018-10-22 | 2019-01-29 | 山东建筑大学 | Can the self-locking of real-time display anchor pole or anchor cable axle power allow pressure pallet and operating method |
| WO2022201897A1 (en) * | 2021-03-26 | 2022-09-29 | 株式会社日立製作所 | Bolt axial force examination method and bolt axial force examination device |
| JP7405788B2 (en) | 2021-03-26 | 2023-12-26 | 株式会社日立製作所 | Bolt axial force testing method and bolt axial force testing device |
| CN114608972A (en) * | 2022-02-24 | 2022-06-10 | 中煤科工开采研究院有限公司 | Anchor rod supporting plate mechanical property testing device and testing method |
| CN114608972B (en) * | 2022-02-24 | 2023-11-17 | 中煤科工开采研究院有限公司 | Anchor rod supporting plate mechanical property testing device and testing method |
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Application publication date: 20150610 |