CN114109459A - Anti-impact danger-relieving roadway support-surrounding rock spalling integrated system - Google Patents
Anti-impact danger-relieving roadway support-surrounding rock spalling integrated system Download PDFInfo
- Publication number
- CN114109459A CN114109459A CN202111391406.3A CN202111391406A CN114109459A CN 114109459 A CN114109459 A CN 114109459A CN 202111391406 A CN202111391406 A CN 202111391406A CN 114109459 A CN114109459 A CN 114109459A
- Authority
- CN
- China
- Prior art keywords
- spalling
- valve
- hydraulic prop
- support
- pressure
- 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.)
- Granted
Links
- 239000011435 rock Substances 0.000 title claims abstract description 55
- 238000004901 spalling Methods 0.000 title claims abstract description 51
- 238000007789 sealing Methods 0.000 claims description 29
- 239000007788 liquid Substances 0.000 claims description 14
- 230000009172 bursting Effects 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 230000010354 integration Effects 0.000 claims 1
- 230000006378 damage Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 239000000839 emulsion Substances 0.000 abstract description 4
- 230000002195 synergetic effect Effects 0.000 abstract description 3
- 230000035939 shock Effects 0.000 abstract description 2
- 101100521345 Mus musculus Prop1 gene Proteins 0.000 description 12
- 108700017836 Prophet of Pit-1 Proteins 0.000 description 12
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 239000003245 coal Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000368 destabilizing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/14—Telescopic props
- E21D15/44—Hydraulic, pneumatic, or hydraulic-pneumatic props
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D15/00—Props; Chocks, e.g. made of flexible containers filled with backfilling material
- E21D15/50—Component parts or details of props
- E21D15/51—Component parts or details of props specially adapted to hydraulic, pneumatic, or hydraulic-pneumatic props, e.g. arrangements of relief valves
- E21D15/517—Extension elements
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Landscapes
- Engineering & Computer Science (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Mechanical Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Refuge Islands, Traffic Blockers, Or Guard Fence (AREA)
Abstract
The invention discloses a roadway support-surrounding rock spalling integrated system resisting shock and danger, which comprises a support system and a spalling system, wherein the support system consists of a hydraulic prop and a three-way valve, the spalling system consists of a pressure relay, a two-position two-way electromagnetic valve, a one-way valve, a two-position four-way electromagnetic valve and rock spalling equipment, and the support system and the spalling system are connected through a conduit of the hydraulic prop. The invention can reutilize the emulsion released by the hydraulic prop, is used for the rock spalling equipment to spall the surrounding rock, simultaneously avoids the damage of the prop caused by the fact that the safety valve of the hydraulic prop cannot release the pressure in time, and maintains the safety of the whole supporting system. The integrated system can realize the synergistic effect of surrounding rock spallation stress release and roadway support, and further achieve the effect of eliminating surrounding rock impact disasters.
Description
Technical Field
The invention relates to the technical field of supporting systems, in particular to an anti-impact and anti-danger-relieving roadway supporting-surrounding rock spalling integrated system.
Background
Rock burst is a sudden and violent dynamic damage phenomenon generated by the instant release of elastic deformation energy of surrounding rocks of a coal mine, and is one of major dynamic disasters in coal mine production. Shoring is the most direct barrier to impact hazards and to prevent destabilizing destruction of the surrounding rock. The hydraulic prop is a telescopic prop which generates working resistance by utilizing liquid pressure and realizes prop lifting and unloading, when the external load exceeds a threshold value set by the hydraulic prop, the safety valve is immediately opened to discharge liquid and release pressure, and when the load is reduced to be within the threshold value, the safety valve is automatically closed.
In the underground mining process, although a common hydraulic prop is widely applied, the hydraulic prop safety valve has a serious defect that the pressure relief in unit time is constant and the discharged flow is constant, and during sudden impact, if the impact is too large, the safety valve cannot relieve the pressure in time, so that damages such as cylinder explosion, sealing ring crushing, prop buckling and the like can be caused, the supporting failure of the whole supporting system is further caused, and hidden dangers are caused to the underground safety.
Disclosure of Invention
The invention aims to provide an anti-impact and anti-danger-relieving roadway support-surrounding rock spalling integrated system, which is used for solving the problems in the prior art, so that the surrounding rock is split to release redundant rock stress while the pressure of a hydraulic prop is relieved, and the safety of the whole support system is further maintained.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides an anti-impact danger-relieving roadway support-surrounding rock spalling integrated system, which comprises a support system and a spalling system; the support system consists of a hydraulic prop and a three-way valve; the spalling system consists of a pressure relay, a two-position two-way electromagnetic valve, a one-way valve, a two-position four-way electromagnetic valve and rock spalling equipment; the support system is connected with the spalling system through a conduit of the hydraulic prop.
Preferably, the hydraulic prop in the support system comprises a cylinder body, a base and a conduit; the cylinder body is sleeved on the base, and a sealing groove is arranged between the cylinder body and the base; the base is provided with a through hole communicated with the inner cavity of the hydraulic prop; an annular groove is formed at the outer end of the through hole; the annular groove is provided with threads so as to be connected with the guide pipe in a threaded manner; the inner part of the guide pipe is provided with threads which are connected with the annular groove threads, and a stepped hole is arranged in the guide pipe; the stepped hole is provided with a sealing groove and is in contact fit with the outer end face of the through hole; one end of the guide pipe is connected with the inner cavity of the hydraulic prop, and the other end of the guide pipe is connected with the spalling system.
Preferably, a sealing ring seal is arranged in a sealing groove at the upper end of the base, and a steel wire composite sealing strip seal is arranged in a sealing groove at the lower end of the base; and a sealing groove of the stepped hole is provided with a sealing ring for sealing.
Preferably, the three-way valve in the support system is integrated by a one-way valve, an unloading valve and a safety valve; the check valve is connected with the hydraulic pump and used for injecting liquid; the unloading valve and the oil way where the safety valve is located are connected in parallel; the unloading valve is used for unloading to enable the hydraulic prop to return to the column; the safety valve unloads when the pressure reaches a certain value, and the internal pressure of the hydraulic prop is kept constant.
Preferably, the bursting system is connected with a conduit of the hydraulic prop; a pressure relay is arranged between the two-position two-way electromagnetic valve and the conduit; the pressure relay can convert the pressure signal into an electric signal to control the power-on and power-off of the two-position two-way electromagnetic valve and the two-position four-way electromagnetic valve magnet, and the set pressure threshold is slightly lower than the opening threshold of the safety valve; the two-position two-way electromagnetic valve can realize the connection and the interruption of the pipeline after obtaining the signal; the two-position four-way electromagnetic valve can realize the reversing of the pipeline after obtaining the signal; the rock bursting equipment can convert liquid pressure into bursting force so as to burst surrounding rocks.
Compared with the prior art, the invention has the following technical effects:
the invention can reutilize the emulsion released by the hydraulic prop, is used for the rock spalling equipment to spall the surrounding rock, simultaneously avoids the damage of the prop caused by the fact that the safety valve of the hydraulic prop cannot release the pressure in time, and maintains the safety of the whole supporting system. The integrated system can realize the synergistic effect of surrounding rock spallation stress release and roadway support, and further achieve the effect of eliminating surrounding rock impact disasters.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic diagram of the impact-resistant danger-relieving roadway support-surrounding rock spalling integrated system.
Fig. 2 is a schematic view of the bottom structure of the hydraulic prop according to the present invention.
Fig. 3 is a schematic structural view of the base of the present invention.
Fig. 4 is a schematic structural view of the cylinder body of the present invention.
Fig. 5 is a schematic view of the structure of the catheter of the present invention.
Wherein: 1-hydraulic prop, 2-cylinder body, 3-oil tank, 4-hydraulic pump, 5-one-way valve, 6-unloading valve, 7-safety valve, 8-three-way valve, 9-pressure relay, 10-two-position two-way electromagnetic valve, 11-two-position four-way electromagnetic valve, 12-rock spalling equipment, 13-base, 14-guide pipe, 15-sealing groove, 16-annular groove, 17-through hole outer end face, 18-through hole, 19-stepped hole, 20-support system and 21-spalling system.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
The invention aims to provide an anti-impact and anti-danger-relieving roadway support-surrounding rock spalling integrated system, which is used for solving the problems in the prior art, the emulsion released by a hydraulic prop is reused for spalling the surrounding rock by rock spalling equipment, meanwhile, the damage of the prop caused by the fact that a safety valve of the hydraulic prop cannot release pressure in time is avoided, and the safety of the whole support system is maintained. The integrated system can realize the synergistic effect of surrounding rock spallation stress release and roadway support, and further achieve the effect of eliminating surrounding rock impact disasters.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
As shown in fig. 1 to 5: the embodiment provides an anti-impact and anti-danger-resolution roadway support-surrounding rock spalling integrated system, which comprises a support system 20 and a spalling system 21; the support system 20 consists of a hydraulic prop 1 and a three-way valve 8; the spalling system 21 consists of a pressure relay 9, a two-position two-way electromagnetic valve 10, a one-way valve 5, a two-position four-way electromagnetic valve 11 and rock spalling equipment 12; the support system 20 is connected with the spalling system 21 through the conduit 14 of the hydraulic prop 1.
The hydraulic prop 1 in the support system 20 comprises a cylinder body 2, a base 13 and a guide pipe 14; the cylinder body 2 is sleeved on the base 13, and a sealing groove 15 is arranged between the cylinder body and the base 13; the base 13 is provided with a through hole 18 communicated with the inner cavity of the hydraulic prop 1; an annular groove 16 is arranged at the outer end of the through hole 18; the annular groove 16 is provided with threads so as to be in threaded connection with the conduit 14; the inner part of the guide pipe 14 is provided with threads which are connected with the annular groove 16 in a threaded manner, and the inner part of the guide pipe 14 is provided with a stepped hole 19; a sealing groove 15 is formed in the stepped hole 19, and the stepped hole 19 is in contact fit with the outer end face 17 of the through hole; one end of the conduit 14 is connected with the inner cavity of the hydraulic prop 1, and the other end is connected with a spalling system 21.
A sealing ring seal is arranged in an upper end sealing groove 15 of the base 13, and a steel wire composite sealing strip seal is arranged in a lower end sealing groove 15; the sealing groove 15 of the stepped hole 19 is provided with a sealing ring for sealing.
The three-way valve 8 in the support system 20 is integrated by a one-way valve 5, an unloading valve 6 and a safety valve 7; the one-way valve 5 is connected with the hydraulic pump 4 and is used for injecting liquid; the unloading valve and the oil way where the safety valve is located are connected in parallel; the unloading valve 6 is used for unloading to enable the hydraulic prop 1 to return to the prop; the relief valve 7 is unloaded when the pressure reaches a certain value, and the internal pressure of the hydraulic prop 1 is kept constant.
The bursting system 21 is connected with the guide pipe 14 of the hydraulic prop 1; a pressure relay 9 is arranged between the two-position two-way electromagnetic valve 10 and the guide pipe 14; the pressure relay 9 can convert the pressure signal into an electric signal to control the power on and power off of the two-position two-way electromagnetic valve 10 and the two-position four-way electromagnetic valve 11, and the set pressure threshold is slightly lower than the opening threshold of the safety valve 7; the two-position two-way electromagnetic valve 10 can realize the connection and the interruption of the pipeline after obtaining the signal; the two-position four-way electromagnetic valve 11 can realize the reversing of the pipeline after obtaining the signal; the rock bursting apparatus 12 can convert fluid pressure into bursting force to burst the surrounding rock.
The concrete working process of the anti-impact danger-relieving roadway support-surrounding rock spalling integrated system is as follows:
before working, the oil circuit is assembled among all the devices by using hoses. The liquid injection handle is inserted into the three-way valve 8, the hydraulic prop 1 rises to perform a normal primary support stage, the two-position two-way electromagnetic valve 10 is in a normally closed position disconnection state at the moment, the oil way is disconnected, and the hydraulic prop 1 performs normal support work. And injecting the liquid injection handle into a rod cavity of the rock spalling device 12 through the one-way valve 5, stopping injecting liquid when a piston rod of the rock spalling device 12 is positioned at the top, enabling the rock spalling device 12 to be in a standby working state, and reserving enough emulsion in the pipeline to serve as a force transmission medium.
When the hydraulic prop 1 is impacted by a large load suddenly, the pressure in the inner cavity of the hydraulic prop is increased rapidly, and when the hydraulic pressure reaches a certain value, the pressure relay 9 starts to work, converts a pressure signal into an electric signal and controls the two-position two-way electromagnetic valve 10 and the two-position four-way electromagnetic valve 11 to be electrified, so that an oil circuit between the hydraulic prop 1 and the rock spalling equipment 12 is switched on. The high pressure liquid enters the piston cavity of the rock spalling device 12 along with the high pressure liquid, and the piston rod of the high pressure liquid is pushed to move downwards to spall the rock.
After the first wave impact is finished, the pressure of the inner cavity of the hydraulic support 1 is gradually weakened, the pressure relay 9 recovers to the initial state, the two-position two-way electromagnetic valve 10 and the two-position four-way electromagnetic valve 11 lose power, the hydraulic support 1 and the oil way of the rock spalling equipment 12 form a closed circuit, and the hydraulic support 1 recovers to the normal supporting state again.
The roadway support-surrounding rock spalling integrated system capable of resisting shock and danger in the embodiment can bear multiple times of pressure sudden change impact, spalling is stopped until a piston rod in rock spalling equipment 12 reaches the maximum stroke displacement, if a hydraulic prop at the moment is impacted again, a safety valve 7 in a three-way valve 8 is used for cavity opening and overflowing, and then a liquid injection handle is injected into a rod cavity of the rock spalling equipment 12 again through a one-way valve 5 for return stroke, so that impact can be resisted again. The system of this embodiment is when the pressure release protection pillar, splits the rock mass and releases unnecessary rock mass internal stress, and then has maintained the safety of whole supporting system.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (5)
1. The utility model provides an anti tunnel support-country rock spalling integration system that solves danger which characterized in that: comprises a supporting system and a spalling system; the support system consists of a hydraulic prop and a three-way valve; the spalling system consists of a pressure relay, a two-position two-way electromagnetic valve, a one-way valve, a two-position four-way electromagnetic valve and rock spalling equipment; the support system is connected with the spalling system through a conduit of the hydraulic prop.
2. The roadway support-surrounding rock spalling resisting and danger relieving integrated system is characterized in that: the hydraulic prop in the support system comprises a cylinder body, a base and a guide pipe; the cylinder body is sleeved on the base, and a sealing groove is arranged between the cylinder body and the base; the base is provided with a through hole communicated with the inner cavity of the hydraulic prop; an annular groove is formed at the outer end of the through hole; the annular groove is provided with threads so as to be connected with the guide pipe in a threaded manner; the inner part of the guide pipe is provided with threads which are connected with the annular groove threads, and a stepped hole is arranged in the guide pipe; the stepped hole is provided with a sealing groove and is in contact fit with the outer end face of the through hole; one end of the guide pipe is connected with the inner cavity of the hydraulic prop, and the other end of the guide pipe is connected with the spalling system.
3. The roadway support-surrounding rock spalling resisting and danger relieving integrated system is characterized in that: a sealing ring seal is arranged in a sealing groove at the upper end of the base, and a steel wire composite sealing strip seal is arranged in a sealing groove at the lower end of the base; and a sealing groove of the stepped hole is provided with a sealing ring for sealing.
4. The roadway support-surrounding rock spalling resisting and danger relieving integrated system is characterized in that: the three-purpose valve in the support system is integrated by a one-way valve, an unloading valve and a safety valve; the check valve is connected with the hydraulic pump and used for injecting liquid; the unloading valve and the oil way where the safety valve is located are connected in parallel; the unloading valve is used for unloading to enable the hydraulic prop to return to the column; the safety valve unloads when the pressure reaches a certain value, and the internal pressure of the hydraulic prop is kept constant.
5. The roadway support-surrounding rock spalling resisting and danger relieving integrated system is characterized in that: the spalling system is connected with a guide pipe of the hydraulic prop; a pressure relay is arranged between the two-position two-way electromagnetic valve and the conduit; the pressure relay can convert the pressure signal into an electric signal to control the power-on and power-off of the two-position two-way electromagnetic valve and the two-position four-way electromagnetic valve magnet, and the set pressure threshold is slightly lower than the opening threshold of the safety valve; the two-position two-way electromagnetic valve can realize the connection and the interruption of the pipeline after obtaining the signal; the two-position four-way electromagnetic valve can realize the reversing of the pipeline after obtaining the signal; the rock bursting equipment can convert liquid pressure into bursting force so as to burst surrounding rocks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111391406.3A CN114109459B (en) | 2021-11-23 | 2021-11-23 | Anti-impact and anti-danger roadway support-surrounding rock expansion integrated system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111391406.3A CN114109459B (en) | 2021-11-23 | 2021-11-23 | Anti-impact and anti-danger roadway support-surrounding rock expansion integrated system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114109459A true CN114109459A (en) | 2022-03-01 |
| CN114109459B CN114109459B (en) | 2023-12-12 |
Family
ID=80439650
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111391406.3A Active CN114109459B (en) | 2021-11-23 | 2021-11-23 | Anti-impact and anti-danger roadway support-surrounding rock expansion integrated system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114109459B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL2030437B1 (en) * | 2022-01-05 | 2023-07-10 | Univ Liaoning Technical | Support-spallation integrated system for preventing damage of surrounding rock of roadway by rock burst |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2326728Y (en) * | 1997-09-16 | 1999-06-30 | 陶纪南 | Expansion-cracking type self-adaptive multi-point-anchoring anchor |
| WO2014092854A1 (en) * | 2012-12-13 | 2014-06-19 | Schlumberger Canada Limited | Mechanically assisted fracture initiation |
| CN104989438A (en) * | 2015-06-16 | 2015-10-21 | 中国矿业大学(北京) | Safety valve on hydraulic support middle vertical shaft |
| CN205361570U (en) * | 2016-02-04 | 2016-07-06 | 潍坊亿宏重工机械有限公司 | Spalling machine |
| CN108266226A (en) * | 2018-01-23 | 2018-07-10 | 山东理工大学 | A kind of rock burst solution danger method based on hydraulic machinery splitting |
| CN111594235A (en) * | 2020-04-22 | 2020-08-28 | 山东科技大学 | Buffer type mining supporting equipment and supporting method |
| CN113074007A (en) * | 2021-04-26 | 2021-07-06 | 辽宁工程技术大学 | Anti-impact energy absorber for hydraulic support |
-
2021
- 2021-11-23 CN CN202111391406.3A patent/CN114109459B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2326728Y (en) * | 1997-09-16 | 1999-06-30 | 陶纪南 | Expansion-cracking type self-adaptive multi-point-anchoring anchor |
| WO2014092854A1 (en) * | 2012-12-13 | 2014-06-19 | Schlumberger Canada Limited | Mechanically assisted fracture initiation |
| CN104989438A (en) * | 2015-06-16 | 2015-10-21 | 中国矿业大学(北京) | Safety valve on hydraulic support middle vertical shaft |
| CN205361570U (en) * | 2016-02-04 | 2016-07-06 | 潍坊亿宏重工机械有限公司 | Spalling machine |
| CN108266226A (en) * | 2018-01-23 | 2018-07-10 | 山东理工大学 | A kind of rock burst solution danger method based on hydraulic machinery splitting |
| CN111594235A (en) * | 2020-04-22 | 2020-08-28 | 山东科技大学 | Buffer type mining supporting equipment and supporting method |
| CN113074007A (en) * | 2021-04-26 | 2021-07-06 | 辽宁工程技术大学 | Anti-impact energy absorber for hydraulic support |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL2030437B1 (en) * | 2022-01-05 | 2023-07-10 | Univ Liaoning Technical | Support-spallation integrated system for preventing damage of surrounding rock of roadway by rock burst |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114109459B (en) | 2023-12-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109723480B (en) | Tension-compression coupling yielding energy-absorbing grouting anchor rod for large deformation of surrounding rock and working method | |
| CN104179881B (en) | A kind of jack-up unit buffer system | |
| CN113074007B (en) | Anti-impact energy absorber for hydraulic support | |
| CN108868856B (en) | Energy-absorbing anchoring method of high-impact-resistant large-deformation energy-absorbing anchoring tray assembly | |
| CN103541748B (en) | Flushing preventing valve with single hydraulic prop | |
| CN114109459B (en) | Anti-impact and anti-danger roadway support-surrounding rock expansion integrated system | |
| CN105736023A (en) | Large-deformation energy-absorption anchor rod | |
| CN103758550B (en) | A kind of liquid expanding allows presses the anti-High-geotemperature anchor pole of antidetonation | |
| CN207813560U (en) | Coal seam waterpower buckling hole packer | |
| CN102536280B (en) | Resistance-increasing yielding anchor rod | |
| CN102808634A (en) | Hydraulic coupling anchor bolt | |
| CN209430225U (en) | A kind of hydraulic vertical prop stepped down with the quick energy-absorbing of accumulator | |
| CN104989001A (en) | Anti-pulling shearing locking device | |
| CN205277466U (en) | Gradable lets pressure stock | |
| CN102400695A (en) | Intelligent anti-impact bracket device | |
| CN114517702B (en) | Circulating type energy-absorbing yielding large-deformation anchoring device and using method thereof | |
| CN114352331B (en) | Anti-integrated energy-absorbing impact-resistant anchor rod and impact-resistant method thereof | |
| CN210829316U (en) | Strong energy-absorbing hydraulic support pillar with rock burst resistance function | |
| CN115076186A (en) | Self-cutting expansion type impact-resistant hydraulic cylinder structure and working method | |
| CN214698204U (en) | Double-control constant-pressure fluid delivery pump | |
| NL2030437B1 (en) | Support-spallation integrated system for preventing damage of surrounding rock of roadway by rock burst | |
| CN108953419B (en) | Hydraulic braking system | |
| CN114320391B (en) | Anti-impact integrated anti-impact energy absorbing device and method | |
| CN105484380A (en) | Separated automatic-rebounding horizontal shearing locking device | |
| CN201377483Y (en) | Overpressure protection device for hydraulic cylinder |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |