CN207923406U - Dynamic lower bolt and mechanical character of surrounding rock research device - Google Patents
Dynamic lower bolt and mechanical character of surrounding rock research device Download PDFInfo
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- CN207923406U CN207923406U CN201820331349.7U CN201820331349U CN207923406U CN 207923406 U CN207923406 U CN 207923406U CN 201820331349 U CN201820331349 U CN 201820331349U CN 207923406 U CN207923406 U CN 207923406U
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- China
- Prior art keywords
- anchor
- casing
- anchor pole
- surrounding rock
- lower bolt
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Abstract
The purpose of this utility model is to provide a kind of device that can study prestressed anchor dynamic characteristics easy to operate, highly practical.Dynamic lower bolt and mechanical character of surrounding rock research device, including casing, anchor pole, Anchor Agent, fixing end, Anchor Agent is by anchor rod anchored in casing, anchor pole one end is located in casing, the end cap pipe has longitudinal grooved, fixing end is fixedly linked by slotting with the end anchor pole, and fixing end is fixedly linked with ground, and the block that is hit is sleeved on the end cap nozzle.The beneficial effects of the utility model：1. overcoming the limitation that the research to anchor pole mechanical characteristic at present only considers static load；2. capableing of the mechanical characteristic of real simulation research impact lower prestress anchor pole；3. it is easy to operate convenient for observing and recording instantaneous impact condition, it is economical and practical；4. experiment is more intuitive true；5. the block that is hit since its is detachable, is convenient for the installation of fixing end, while having saved experimentation cost.
Description
Technical field
The utility model is related to rock-soil mechanics field, especially a kind of device of research anchor pole dynamic characteristics.
Background technology
Prestressed anchorage technology is reinforced to rock mass using anchor pole or anchor cable, it can significantly improve surrounding rock structure simultaneously
Its stability is improved, is a kind of construction is simple, safe and reliable and cost-effective reinforcement technique, has been widely used for getter
In the fields such as journey, water conservancy and hydropower, railway traffic and urban construction, and achieve good economic and social benefit.However, with
The problem of increase of rock mass engineering project mining depth, mining conditions tend to be complicated, and suspension roof support is failed protrudes, as prestressing force disappears,
Supporting plate falls off to be broken with anchor pole, this has become the major issue for influencing project progress and safety.Therefore, it is necessary to carry out anchor
The mechanical response feature and failure Mechanism of bar.
In recent years, many scholars have carried out anchor pole material, anchorage style and special to anchor pole mechanics with the factors such as chemical environment
The research of property and failure mechanism.However, most study the indoor pull-out test being concentrated mainly under action of static load, model examination
It tests and numerical analysis, in deep rock mass engineering project, prestressed anchor is frequently subjected to the shadow of the dynamic loadings such as blasting vibration, exploitation disturbance
It rings.
These disturbances carry energy diffusive transport in the form of stress wave, become the great of deep engineering country rock anchor pole failure
Inducement.Under certain conditions or even small disturbance may all induce high stress engineering surrounding rock suspension roof support failure, to make
At the generation of deep rock mass disaster.Therefore, how ensure Under Dynamic Load lower bolt supporting stability have become there is an urgent need to
The new issue of research.
Nondestructive detecting technology was had focused largely on for the Study on dynamic response of anchor pole in the past, analysis anchor system is various
Audio-frequency stress wave is propagated in vibration characteristics and anchoring system under exciting force effect, is defined, is belonged to by the size of strain rate when load
In static load scope, however, Practical Project borehole blasting is vibrated, exploits high strain rate model during the dynamic loadings such as disturbance are in mostly
Farmland.It then becomes necessary to which the mechanical response mechanism of the strain rates dynamic load effect lower bolt such as centering height is studied.
Utility model content
The purpose of this utility model, which is to provide, a kind of easy to operate, highly practical can study prestressed anchor dynamic force
Learn the device of characteristic.
Dynamic lower bolt and mechanical character of surrounding rock research device, including casing, anchor pole, Anchor Agent, fixing end, Anchor Agent will
Anchor rod anchored anchor pole one end is located in casing in casing, which there is longitudinal grooved, fixing end to pass through fluting and the end
Anchor pole is fixedly linked, and fixing end is fixedly linked with ground, and the block that is hit is sleeved on the end cap nozzle.
Fixing end includes fixed block, nut, gasket and fixed seat, and fixed block is strip, and there is a hole at middle part, and anchor pole is from hole
In pass through, nut matches with the screw thread of anchor pole, and nut and gasket are mounted on anchor pole, fixed by the position restriction of fixed block
The both ends of block are located at outside casing, and both ends and the fixed seat of fixed block are fixedly linked, and fixed seat is fixedly linked with SHPB test platforms,
SHPB test platforms are fixedly linked with ground.
Casing fluting is equal with the width of fixed block.
The block that is hit is two rank cylinder tables, in the smaller cylinder table plug-in-sleeve of outer diameter, the larger cylinder table of outer diameter it is outer
Diameter is equal to or more than sleeve outer.
One end that casing is in contact with the block that is hit is equipped with surge protection set, and surge protection set is cylindrical shape, internal diameter
It equal to sleeve outer, is sleeved on casing outer, there is certain distance between Anchor Agent and sleeve opening.
Casing has internal thread, Anchor Agent to be anchored on internal thread.
Anchor pole upper edge is axially arranged with the certain several groovings in interval, and foil gauge is attached on grooving.
Casing upper edge is axially arranged with multiple holes, and the connecting wire of foil gauge is passed through from hole.
Foil gauge conducting wire is connected to by bridge box on dynamic strain indicator, and dynamic strain indicator is connected with oscillograph, oscillograph and meter
Calculation machine is connected.
The beneficial effects of the utility model：
It is deep rock mass engineering project 1. overcoming the limitation that the research to anchor pole mechanical characteristic at present only considers static load
The research of prestressed anchor dynamic characteristics provides a kind of new equipment；
2. be hit due to the device, impact force acts on the opposite of anchor pole and country rock and pulls completely, anchor pole and encloses
The direction of displacement of rock is on the contrary, be capable of the mechanical characteristic of real simulation research impact lower prestress anchor pole；
3. the device utilizes Newton's second law, with the mode of impact casing instead of the mode for stretching anchor pole, cover in this way
Pipe is completely exposed outside so that instantaneous impact condition is observed and recorded when experiment, it is easy to operate, and it is economical and practical；
4. Anchor Agent is anchored on the internal thread of casing, opposite position when avoiding impact between Anchor Agent and internal surface of sleeve pipe
It moves, relative displacement when impact between anchor pole and casing is embodied between anchor pole and Anchor Agent completely, and experiment is more intuitive true；
5. the presence of surge protection set is primarily due to it and is sleeved on casing fluting end, generated at fluting when avoiding impact
It splits deformation, buffer protection function secondly is played to casing, finally since its is detachable, be convenient for the installation of fixing end,
Experimentation cost is saved simultaneously.
6. fixing anchor bar of directly slotting on casing, although the installation to nut brings inconvenience, due to impact force
It is equivalent to and directly acts on casing, the transmission of power is direct, avoids the offset in direction in transmittance process, and experiment more really has
Effect.
Description of the drawings
Fig. 1 is the overall structure diagram of the utility model；
Fig. 2 is fixing end and the block partial enlargement structural representation that is hit；
Fig. 3 is sleeve opening partial enlargement structural representation；
Fig. 4 is foil gauge partial enlargement structural representation；
Fig. 5 is the utility model assembly structure diagram；
1, casing in figure, 2, anchor pole, 3, Anchor Agent, 4, fixing end, 5, be hit block, 6, fixed block, 7, nut, 8, pad
Piece, 9, fixed seat, 10, fluting, 11, surge protection set, 12, conducting wire, 13, foil gauge, 14, hole.
Specific implementation mode
Embodiment 1
As shown in attached drawing 1-4, dynamic lower bolt and mechanical character of surrounding rock research device, including casing, anchor pole, Anchor Agent,
Fixing end, by anchor rod anchored in casing, anchor pole one end is located in casing Anchor Agent, which has longitudinal grooved, fixed
End is fixedly linked by slotting with the end anchor pole, and fixing end is fixedly linked with ground, and the block that is hit is sleeved on the end cap nozzle.
Fixing end includes fixed block, nut, gasket and fixed seat, and fixed block is strip, and there is a hole at middle part, and anchor pole is from hole
In pass through, nut matches with the screw thread of anchor pole, and nut and gasket are mounted on anchor pole, fixed by the position restriction of fixed block
The both ends of block are located at outside casing, and both ends and the fixed seat of fixed block are fixedly linked, and fixed seat is fixedly linked with SHPB test platforms,
SHPB test platforms are fixedly linked with ground.
Casing fluting is equal with the width of fixed block.
The block that is hit is two rank cylinder tables, in the smaller cylinder table plug-in-sleeve of outer diameter, the larger cylinder table of outer diameter it is outer
Diameter is equal to or more than sleeve outer.
One end that casing is in contact with the block that is hit is equipped with surge protection set, and surge protection set is cylindrical shape, internal diameter
It equal to sleeve outer, is sleeved on casing outer, there is certain distance between Anchor Agent and sleeve opening.
Casing has internal thread, Anchor Agent to be anchored on internal thread.
Anchor pole upper edge is axially arranged with the certain several groovings in interval, and foil gauge is attached on grooving.
Casing upper edge is axially arranged with multiple holes, and the connecting wire of foil gauge is passed through from hole.
Foil gauge conducting wire is connected to by bridge box on dynamic strain indicator, and dynamic strain indicator is connected with oscillograph, oscillograph and meter
Calculation machine is connected.
The application method of the device is as follows：
A. foil gauge is attached on the grooving of anchor pole, foil gauge SG1, SG2, SG3 will be anchor rod anchored using Anchor Agent
In casing；
B. as shown in Fig. 5, after waiting Anchor Agents to conserve, fixed block is put into along anchor pole and casing fluting, then with length
Nut and gasket are sleeved on anchor pole by box spanner, apply prestressing force to anchor pole using digital display spanner, pretightning force calculation formula is：, MtFor pre-fastening moment, K is to tighten force coefficient, and P is pretightning force, and D is screw thread nominal diameter, can be counted
Calculation obtains structural initial pre stress, and surge protection set and the block that is hit are sleeved on sleeve opening later；
C. by assembled experimental rig be mounted on Hopkinson test device on, the fixing device of SHPB test platforms with
Ground is fixedly linked, then the fixed seat of fixed block and SHPB test platforms is fixedly linked, by foil gauge conducting wire on anchor pole
It is connected on dynamic strain indicator by bridge box, opens dynamic strain indicator and oscillograph later, it is ensured that protected with casing when incident bar impacts
Hold it is coaxial, inspection connected with the foil gauge on anchor pole it is whether normal, setting dynamic air pressure, be ready for dynamic impact test；
D. after having impacted, the signal obtained on foil gauge on recording oscillometer, anchor pole slippage, the elastic situation of nut,
Casing is opened later, observes the degree of impairment of Anchor Agent, finally closes all appts, clears up Anchor Agent in casing, is completed entire
Experiment process；
E. anchor pole slippage is obtained using vernier caliper measurement, the remaining prestressing force of anchor pole is measured using digital display spanner；
F. stress wave propagation velocity of wave Vp in anchor pole is determined, due to distance △ d1, the SG2 of SG1 and SG2 and the distance △ of SG3
D2 is known, according to the stress wave data of oscillograph three obtained foil gauge, obtains SG1 stress wave signals and SG2 stress
Time difference △ t1, the SG2 stress wave signal of wave start point signal and the time difference △ t2 of SG3 stress wave signal starting points, according to formula
Propagation velocity of wave of the stress wave between SG1 and SG2, between SG2 and SG3 can be calculated in Vp=△ d/ △ t.
Embodiment 2
The present embodiment and embodiment 1 difference lies in the structure for the block that is hit is different, be hit in this implementation block outer diameter compared with
Big one end is cylinder, receives the insertion of incident bar.In the present embodiment surge protection and be hit block by casing, impact
End, the coaxial stabilization of incident bar are connected, and are conducive to the transmission of impact force.
Claims (9)
1. dynamic lower bolt and mechanical character of surrounding rock research device, it is characterized in that including casing, anchor pole, Anchor Agent, fixing end, anchor
Gu agent is by anchor rod anchored in casing, anchor pole one end is located in casing, which there is longitudinal grooved, fixing end to pass through fluting
Anchor pole is fixedly linked with the end, and fixing end is fixedly linked with ground, and the block that is hit is sleeved on the end cap nozzle.
2. according to dynamic lower bolt and mechanical character of surrounding rock research device described in claim 1, it is characterized in that fixing end packet
Fixed block, nut, gasket and fixed seat are included, fixed block is strip, and middle part has hole, anchor pole to be passed through from hole, nut and anchor
The screw thread of bar matches, and nut and gasket are mounted on anchor pole, and the both ends of the position restriction of fixed block, fixed block are located at casing
Outside, the both ends of fixed block are fixedly linked with fixed seat, and fixed seat is fixedly linked with SHPB test platforms, SHPB test platforms and ground
Face is fixedly linked.
3. according to dynamic lower bolt and mechanical character of surrounding rock research device described in claim 2, it is characterized in that casing is slotted
It is equal with the width of fixed block.
4. according to dynamic lower bolt and mechanical character of surrounding rock research device described in claim 3, it is characterized in that the block that is hit
For two rank cylinder tables, in the smaller cylinder table plug-in-sleeve of outer diameter, the outer diameter of the larger cylinder table of outer diameter is equal to or more than casing
Outer diameter.
5. according to dynamic lower bolt and mechanical character of surrounding rock research device described in claim 1, it is characterized in that casing with by
One end that impact block is in contact is equipped with surge protection set, and surge protection set is cylindrical shape, and internal diameter is equal to sleeve outer, set
On casing outer, there is certain distance between Anchor Agent and sleeve opening.
6. according to dynamic lower bolt and mechanical character of surrounding rock research device described in claim 1, it is characterized in that in casing has
Screw thread, Anchor Agent are anchored on internal thread.
7. the dynamic lower bolt according to claim 1 or 4 or 5 or 6 and mechanical character of surrounding rock research device, it is characterized in that
Anchor pole upper edge is axially arranged with the certain several groovings in interval, and foil gauge is attached on grooving.
8. according to dynamic lower bolt and mechanical character of surrounding rock research device described in claim 7, it is characterized in that casing upper edge
It is axially arranged with multiple holes, the connecting wire of foil gauge is passed through from hole.
9. according to dynamic lower bolt and mechanical character of surrounding rock research device described in claim 8, it is characterized in that foil gauge is led
Line is connected to by bridge box on dynamic strain indicator, and dynamic strain indicator is connected with oscillograph, and oscillograph is connected with computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820331349.7U CN207923406U (en) | 2018-03-12 | 2018-03-12 | Dynamic lower bolt and mechanical character of surrounding rock research device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820331349.7U CN207923406U (en) | 2018-03-12 | 2018-03-12 | Dynamic lower bolt and mechanical character of surrounding rock research device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207923406U true CN207923406U (en) | 2018-09-28 |
Family
ID=63598789
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820331349.7U Expired - Fee Related CN207923406U (en) | 2018-03-12 | 2018-03-12 | Dynamic lower bolt and mechanical character of surrounding rock research device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207923406U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111155983A (en) * | 2020-01-19 | 2020-05-15 | 湖南科技大学 | Hollow inclusion strain gauge mounting device and method |
-
2018
- 2018-03-12 CN CN201820331349.7U patent/CN207923406U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111155983A (en) * | 2020-01-19 | 2020-05-15 | 湖南科技大学 | Hollow inclusion strain gauge mounting device and method |
| CN111155983B (en) * | 2020-01-19 | 2024-04-19 | 湖南科技大学 | Device and method for installing strain gauge of hollow bag body |
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|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180928 Termination date: 20210312 |
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| CF01 | Termination of patent right due to non-payment of annual fee |