CN104075835A - Test bed for installing and pre-tightening of anchor rod and test method - Google Patents
Test bed for installing and pre-tightening of anchor rod and test method Download PDFInfo
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- CN104075835A CN104075835A CN201410307753.7A CN201410307753A CN104075835A CN 104075835 A CN104075835 A CN 104075835A CN 201410307753 A CN201410307753 A CN 201410307753A CN 104075835 A CN104075835 A CN 104075835A
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Abstract
The invention relates to the technical field of mine supporting, in particular to a test bed for installing and pre-tightening of an anchor rod and a test method. The test bed comprises the anchor rod for mine supporting and further comprises a pre-tightening device, a stretching device, a work test bed body, a dynamic torque sensor, a static torque sensor and a load sensor. One end of the anchor rod is anchored into a drill hole model of the work test bed body. The pre-tightening device is used for exerting pre-tightening force to the anchor rod. The stretching device comprises an impact beam and a stretching top beam, and the other end of the anchor rod is fixed to the impact beam. The stretching top beam corresponds to the impact beam and is used for preventing the impact beam from moving in the axial direction of the anchor rod. The installing and pre-tightening process of the anchor rod is simulated in a laboratory through the test bed, transformation of the tightening torque of an anchor rod nut and the axial pre-tightening force of the anchor rod is accurately tested, the torque borne by a rod body is tested after the anchor rod is installed and pre-tightened, and the test bed for installing and pre-tightening of the anchor rod is of great importance in deepening the mechanism study of anchor rod supporting and ensuring engineering safety.
Description
Technical field
The present invention relates to mine support technical field, relate in particular to a kind of testing table for rockbolt installation pretension and method of testing.
Background technology
At present, bolt supporting has become coal mine roadway main support pattern safely and efficiently, in China's coal-mine tunnel, obtains large scale application.Bolt supporting be by anchor rod anchored in coal and rock, tighten bar tail nut, country rock is applied to prestress, the distortion absciss layer of constraint roadway surrounding rock, broken swollen and the slippage changing of the relative positions.
Bolt supporting when construction, the end of anchor rod exposing in aperture after anchor rod anchored, the supporting members such as skyhook pallet, aligning spherical washer, antifriction pad, and install and tighten anchor pole afterbody nut.Tighten the moment of torsion of anchor nut, a part, through the Force transmission parts such as threaded connection pair and aligning spherical washer, anchor rod pallet board of anchor pole, is converted into anchor pole axial tension, i.e. the pretightning force of rockbolt installation; Another part nut torque, by screw thread friction pair and nut and aligning spherical washer contact end face consumption, form loss of machine of torque.The moment of torsion of frictional dissipation passes to anchor rod body, forms the moment of torsion that the body of rod bears.Nut torque loss increases, and the moment of torsion that the body of rod bears increases, and the actual pretightning force of anchor pole will reduce; The moment of torsion that the body of rod bears, worsens the actual forced status of anchor pole, and anchor pole load-bearing capacity declines.Stressed when research rockbolt installation pretension, to the research of in-depth bolt support mechanism, improves bolt supporting reliability, and guarantee engineering safety is significant.
At present, while studying rockbolt installation pretension, the method for stressing conditions mainly contains two large classes: underground trials and laboratory examination.
Underground trials mainly, by the testing tools such as dynamometer or flat jack are installed, is tested anchor pole axially loaded, evaluates the duty of anchor pole.The data that underground trials obtains are field measurement data, can truly reflect down-hole anchor pole working condition.But the shortcoming of underground trials is: can not accurately test the moment of torsion of fastening nut, can not determine the transforming relationship of nut torque and bolt pretension, also cannot test the mounting torque that anchor rod body bears.Due to the special environment in down-hole, the monitoring method that some are advanced and the application of instrument are also restricted, and the anchor pole limited amount that can monitor, representative not enough, the stressing conditions can not test out accurately and effectively rockbolt installation pretension time.
Laboratory examination is mainly carried out the mini-test of stretching, bending, torsion, shearing and the material impact of anchor rod body test specimen at present.The data of laboratory examination test are accurate, can reflect the basic mechanical performance of anchor pole material.But, laboratory examination shortcoming is: indoor mini-test only reflects the mechanical index of anchor pole material under single stress condition, because lacking the testing table of simulation anchor pole actual installation, can not accurately test the transforming relationship of nut torque and bolt pretension, also cannot test the moment of torsion that installation process anchor rod body bears.
Therefore, for above deficiency, need a kind of can be at the testing table of experiment lab simulation rockbolt installation pretension and stressed method when applying this testing table and testing accurately and effectively rockbolt installation pretension.
Summary of the invention
(1) technical matters that will solve
The technical problem to be solved in the present invention has been to provide a kind of testing table for rockbolt installation pretension and method of testing, make it possible to the stressing conditions in the time of the construction of experiment lab simulation rockbolt installation pretension, test out accurately and effectively stressed in the time that pretension is installed of anchor pole.
(2) technical scheme
In order to solve the problems of the technologies described above, the invention provides a kind of testing table for rockbolt installation pretension, comprise the anchor pole for mine support, it also comprises pre-tightening apparatus, stretching device, work test board, load sensor, dynamic torque sensor and static torque sensor, in described work test board, be provided with boring model, one end of described anchor pole is anchored in boring model, described stretching device comprises impact beam and stretching back timber, described pre-tightening apparatus by tighten anchor pole exposed junction nut so that described anchor pole be fixed on through pallet on the end face of impact beam; The setting corresponding to impact beam of described stretching back timber, for stoping impact beam to move axially along anchor pole; Described load sensor is for testing the pressure between described stretching back timber and impact beam, and described dynamic torque sensor is for testing the moment of torsion that described nut bears, and described static torque sensor is for testing the moment of torsion that described anchor pole bears.
Wherein, on described pre-tightening apparatus, oil motor is installed, described oil motor is connected with nut by installing sleeve, by drive installation sleeve so that described nut around the axis rotation of described anchor pole.
Wherein, described dynamic torque sensor is installed between oil motor and installing sleeve.
Wherein, described static torque sensor is fixedly connected with the model fixed sleeving of described boring model.
Wherein, impact beam, stretching back timber are passed in one end of described anchor pole, and are anchored in boring model, and described impact beam, under the drive of described anchor pole, acts on stretching back timber along the axial compression of described anchor pole.
Wherein, described load sensor is between described stretching back timber and described impact beam.
Wherein, described anchor pole is by the coal and rock physical model bonding of Anchor Agent and described boring model.
For a method of testing for the testing table of rockbolt installation pretension, comprise the steps:
S1, anchor pole to be measured one end is anchored in the boring model of work test board;
S2, after anchor rod anchored, tighten the nut of anchor pole afterbody by pre-tightening apparatus, so that anchor pole is applied to pretightning force;
The pretightning force that S3, anchor pole bear makes stretching device produce pressure, and the size of pressure is identical with the size of pretightning force;
S4, test described pressure by load sensor; The moment of torsion that while testing anchor pole pretension by dynamic torque sensor, nut bears; The moment of torsion that during by static torque sensor test anchor pole pretension, anchor rod body bears.
Wherein, step S2 comprises: oil motor, by the action of control system control guide proportion reduction valve, changes the pressure of its liquid-supplying system with the output torque of regulator solution pressure motor.
Wherein, step S2 comprises: oil motor, by the action of control system control ratio flow speed control valve, changes the oil inlet quantity of oil motor with governor motor output speed.
(3) beneficial effect
Technique scheme of the present invention has following beneficial effect: the present invention can realize the forces testing to rockbolt installation pretension process in laboratory for the testing table of rockbolt installation pretension, for anchor rod supporting theory research and Design of bolt support provide foundation, to the research of in-depth bolt support mechanism, improve bolt supporting reliability, ensure that engineering safety is significant.
Brief description of the drawings
Fig. 1 is the cut-open view of the embodiment of the present invention for the testing table of rockbolt installation pretension.
Wherein, 2: work test board; 5: anchor pole; 6: stretching device; 9: anchor; 32: pre-tightening apparatus; 61: stretching back timber; 62: impact beam; 92: model fixed sleeving; 93: coal and rock physical model; 101a: dynamic torque sensor; 101b: static torque sensor; 103: load sensor; 321: the second motors; 323: installing sleeve.
Embodiment
Below in conjunction with drawings and Examples, embodiments of the present invention are described in further detail.Following examples are used for illustrating the present invention, but can not be used for limiting the scope of the invention.
In description of the invention, except as otherwise noted, the implication of " multiple " is two or more; Except as otherwise noted, the implication of " nick shaped " is the shape except cross section is concordant.Term " on ", orientation or the position relationship of the instruction such as D score, " left side ", " right side ", " interior ", " outward ", " front end ", " rear end ", " head ", " afterbody " be based on orientation shown in the drawings or position relationship, only the present invention for convenience of description and simplified characterization, instead of indicate or imply that the device of indication or element must have specific orientation, construct and operation with specific orientation, therefore can not be interpreted as limitation of the present invention.In addition, term " first ", " second ", " the 3rd " etc. are only for describing object, and can not be interpreted as instruction or hint relative importance.
In description of the invention, it should be noted that, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection " should be interpreted broadly, and for example, can be to be fixedly connected with, and can be also to removably connect, or connect integratedly; Can be mechanical connection, can be also electrical connection; Can be to be directly connected, also can indirectly be connected by intermediary.For the ordinary skill in the art, can concrete condition understand above-mentioned term concrete meaning in the present invention.
As shown in Figure 1, the invention provides a kind of testing table for rockbolt installation pretension, comprise the anchor pole 5 for supporting mine, this testing table also comprises pre-tightening apparatus 32, stretching device 6, work test board 2, load sensor 103, dynamic torque sensor 101a and static torque sensor 101b, in work test board 2, be provided with boring model, one end of anchor pole 5 is anchored in boring model, stretching device 6 comprises impact beam 62 and stretching back timber 61, pre-tightening apparatus 32 is for tightening the nut of anchor pole 5 exposed junctions, so that anchor pole 5 is fixed on the end face of impact beam 62; Stretching back timber 61 setting corresponding to impact beam 62, for stoping impact beam 62 to move axially along anchor pole 5; Load sensor 103 is for testing the pressure between stretching back timber 61 and impact beam 62, dynamic torque sensor 101a is for testing the moment of torsion that pre-tightening apparatus 32 applies nut, and static torque sensor 101b is used for acting on while testing fastening nut the moment of torsion of anchor pole 5.
The pre-tightening apparatus 32 of this testing table adopts oil motor 321 to drive working mechanism to apply rotary torque, after anchor pole 5 anchorings, tighten anchor pole 5 afterbody nuts when pretension, realize installation action is divided, adopt modularization pattern, response frequency is high, do not have overload problem.
Oil motor 321 is installed on pre-tightening apparatus 32, and oil motor 321 is connected with nut by installing sleeve 323,, is realized anchor pole 5 is applied to pretightning force so that nut rotates around the axis of anchor pole 5 by drive installation sleeve 323.
Dynamic torque sensor 101a is installed between oil motor 321 output shafts and installing sleeve 323, moment of torsion nut being applied for testing pre-tightening apparatus 32; Static torque sensor 101b is fixedly connected with the model fixed sleeving 92 of boring model, acts on the moment of torsion of anchor pole 5 when testing fastening nut; And test data is transferred to computer data acquisition system, test data, after program software is processed, obtains the moment of torsion of anchor pole 5 fastening nuts and the moment of torsion that the body of rod bears.
Wherein, one end of anchor pole 5 is through impact beam 62, stretching back timber 61, and is anchored in boring model, and impact beam 62 is under the drive of anchor pole 5, along the axial compression of anchor pole 5 in stretching back timber 61.Between impact beam 62, stretching back timber 61, produce normal pressure.
Load sensor 103 is between stretching back timber 61 and impact beam 62, and for testing the normal pressure between impact beam 62, stretching back timber 61, test data is transferred to computing machine, after program software is processed, obtains the transforming relationship of nut torque and bolt shaft power.
Anchor pole 5 bonds by Anchor Agent and the coal and rock physical model 93 of boring model.Coal and rock physical model 93 is preferably real coal or rock, coal and rock physical model 93 also can be the boring physical model that the Other Engineering material similar to coal or rock made, Anchor Agent is the authentic material adopting in engineering, can be preferably resin anchoring agent, resin anchoring agent is by unsaturated polyester resin, hardening agent, promoter and other auxiliary material, formulated thick material by a certain percentage, use mylar comparting packaging, be cylindric powder stick, there is quick solidifying after stirring at normal temperature, bonding strength is high, the premium properties such as the reliable and good endurance of anchor force, thereby ensure that test detects authenticity and the reliability of data.
In addition, this testing table utilizes liquid-supplying system pressure or the flow of control system control oil motor 321, the technological parameter while installation to change anchor pole 5.
Pressure transducer and guide proportion reduction valve are installed on oil motor 321 in-lines, the liquid-supplying system pressure of pressure transducer testing hydraulic motor 321, change the pressure of liquid-supplying system by the action of computer control system control guide proportion reduction valve, thereby realize the output torque of regulator solution pressure motor 321, realize the control to nut torque.
The proportional velocity regulating valve of controlling flow is installed on oil motor 321 in-lines, by the action of computer control system control ratio flow speed control valve, with governor motor oil inlet quantity, thereby changes motor output speed, realize the control to anchor nut rotating speed.
It is a kind of for the stressed method of testing of rockbolt installation pretension that the present invention also provides, and comprises the steps:
S1, anchor pole to be measured one end is anchored in the boring model of work test board;
S2, after anchor rod anchored, tighten the nut of anchor pole afterbody by pre-tightening apparatus, so that anchor pole is applied to pretightning force; Oil motor, by the action of control system control guide proportion reduction valve, changes the pressure of its liquid-supplying system with the output torque of regulator solution pressure motor.Oil motor, by the action of control system control ratio flow speed control valve, changes the oil inlet quantity of oil motor with governor motor output speed.
The pretightning force that S3, anchor pole bear makes stretching device produce pressure, and the size of pressure is identical with the size of pretightning force;
S4, by load sensor test pressure; The moment of torsion of fastening nut while testing anchor pole pretension by dynamic torque sensor; The moment of torsion that during by static torque sensor test anchor pole pretension, anchor rod body bears.
Embodiments of the invention provide for example with for the purpose of describing, and are not exhaustively or limit the invention to disclosed form.Many modifications and variations are apparent for the ordinary skill in the art.Selecting and describing embodiment is for better explanation principle of the present invention and practical application, thereby and makes those of ordinary skill in the art can understand the present invention's design to be suitable for the various embodiment with various amendments of special-purpose.
Claims (10)
1. the testing table for rockbolt installation pretension, comprise the anchor pole (5) for mine support, it is characterized in that, also comprise pre-tightening apparatus (32), stretching device (6), work test board (2), load sensor (103), dynamic torque sensor (101a) and static torque sensor (101b), described stretching device (6) comprises impact beam (62) and stretching back timber (61), one end of described anchor pole (5) is anchored in the boring model of work test board (2), described pre-tightening apparatus (32) by tighten anchor pole (5) exposed junction nut so that described anchor pole (5) be fixed on the end face of impact beam (62), described stretching back timber (61) setting corresponding to impact beam (62), for stoping impact beam (62) to move axially along anchor pole (5), described load sensor (103) is for testing the pressure between described stretching back timber (61) and impact beam (62), the moment of torsion that described dynamic torque sensor (101a) bears for testing described nut, the moment of torsion that described static torque sensor (101b) bears for testing described anchor pole (5).
2. the testing table for rockbolt installation pretension according to claim 1, it is characterized in that, oil motor (321) is installed on described pre-tightening apparatus (32), described oil motor (321) is connected with nut by installing sleeve (323), by drive installation sleeve (323) so that described nut rotate around the axis of described anchor pole (5).
3. the testing table for rockbolt installation pretension according to claim 2, is characterized in that, described dynamic torque sensor (101a) is installed between oil motor (321) and installing sleeve (323).
4. the testing table for rockbolt installation pretension according to claim 3, is characterized in that, described static torque sensor (101b) is fixedly connected with the model fixed sleeving (92) of described boring model.
5. according to the testing table for rockbolt installation pretension described in any one in claim 1-4, it is characterized in that, one end of described anchor pole (5) is through impact beam (62), stretching back timber (61), and be anchored in boring model, described impact beam (62), under the drive of described anchor pole (5), acts on stretching back timber (61) along the axial compression of described anchor pole (5).
6. the testing table for rockbolt installation pretension according to claim 5, is characterized in that, described load sensor (103) is positioned between described stretching back timber (61) and described impact beam (62).
7. the testing table for rockbolt installation pretension according to claim 1, is characterized in that, described anchor pole (5) is by coal and rock physical model (93) bonding of Anchor Agent and described boring model.
8. according to a method of testing for the testing table for rockbolt installation pretension described in any one in claim 1-7, it is characterized in that, comprise the steps:
S1, anchor pole to be measured one end is anchored in the boring model of work test board;
S2, after anchor rod anchored, tighten the nut of anchor pole afterbody by pre-tightening apparatus, so that anchor pole is applied to pretightning force;
The pretightning force that S3, anchor pole bear makes stretching device produce pressure, and the size of pressure is identical with the size of pretightning force;
S4, test described pressure by load sensor; The moment of torsion that while testing anchor pole pretension by dynamic torque sensor, nut bears; The moment of torsion that during by static torque sensor test anchor pole pretension, anchor rod body bears.
9. method of testing according to claim 8, is characterized in that, step S2 comprises: oil motor, by the action of control system control guide proportion reduction valve, changes the pressure of its liquid-supplying system with the output torque of regulator solution pressure motor.
10. method of testing according to claim 8, is characterized in that, step S2 comprises: oil motor, by the action of control system control ratio flow speed control valve, changes the oil inlet quantity of oil motor with governor motor output speed.
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Cited By (10)
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| 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 |
| CN106643415A (en) * | 2017-02-22 | 2017-05-10 | 中国水利水电第五工程局有限公司 | Anchor pole anti-pull-force displacement test device |
| CN107131993A (en) * | 2017-07-05 | 2017-09-05 | 上海应用技术大学 | The scaling method and calibration system of a kind of circumferential rod fastening rotor pull bar pretightning force of disc type |
| CN108303332A (en) * | 2018-03-12 | 2018-07-20 | 湖南科技大学 | A kind of device and method of research prestressed anchor dynamic characteristics |
| CN108613887A (en) * | 2018-06-05 | 2018-10-02 | 武汉海润工程设备有限公司 | A kind of static-load testing device and its test method of anchor pole |
| CN110567823A (en) * | 2019-09-29 | 2019-12-13 | 天地科技股份有限公司 | method for testing impact resistance of anchor rod anchoring body |
| CN111829767A (en) * | 2020-07-22 | 2020-10-27 | 中国矿业大学 | Anchor rod installation instrument parameter simulation platform and application method thereof |
| CN112816347A (en) * | 2020-12-30 | 2021-05-18 | 中国矿业大学(北京) | NPR anchor rod Hopkinson tensile test device and method under high strain rate condition |
| CN114199605A (en) * | 2022-02-18 | 2022-03-18 | 西南石油大学 | Horizontal drill string system dynamics simulation test bed and test method |
| WO2024146300A1 (en) * | 2023-01-05 | 2024-07-11 | 中煤科工开采研究院有限公司 | Force field test system and test method thereof |
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Cited By (12)
| 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 |
| CN106643415A (en) * | 2017-02-22 | 2017-05-10 | 中国水利水电第五工程局有限公司 | Anchor pole anti-pull-force displacement test device |
| CN107131993A (en) * | 2017-07-05 | 2017-09-05 | 上海应用技术大学 | The scaling method and calibration system of a kind of circumferential rod fastening rotor pull bar pretightning force of disc type |
| CN108303332A (en) * | 2018-03-12 | 2018-07-20 | 湖南科技大学 | A kind of device and method of research prestressed anchor dynamic characteristics |
| CN108303332B (en) * | 2018-03-12 | 2023-11-03 | 湖南科技大学 | Device and method for researching dynamic mechanical characteristics of prestressed anchor rod |
| CN108613887A (en) * | 2018-06-05 | 2018-10-02 | 武汉海润工程设备有限公司 | A kind of static-load testing device and its test method of anchor pole |
| CN108613887B (en) * | 2018-06-05 | 2024-02-09 | 中船双瑞(洛阳)特种装备股份有限公司 | Static load test device and test method for anchor rod |
| CN110567823A (en) * | 2019-09-29 | 2019-12-13 | 天地科技股份有限公司 | method for testing impact resistance of anchor rod anchoring body |
| CN111829767A (en) * | 2020-07-22 | 2020-10-27 | 中国矿业大学 | Anchor rod installation instrument parameter simulation platform and application method thereof |
| CN112816347A (en) * | 2020-12-30 | 2021-05-18 | 中国矿业大学(北京) | NPR anchor rod Hopkinson tensile test device and method under high strain rate condition |
| CN114199605A (en) * | 2022-02-18 | 2022-03-18 | 西南石油大学 | Horizontal drill string system dynamics simulation test bed and test method |
| WO2024146300A1 (en) * | 2023-01-05 | 2024-07-11 | 中煤科工开采研究院有限公司 | Force field test system and test method thereof |
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