Coal mine tunnel rock burst prevention and control device

Abstract

The invention discloses a coal mine roadway rock burst prevention and control device, and relates to the technical field of coal mine safety, the coal mine roadway rock burst prevention and control device comprises an anti-impact rod piece penetrating into a coal mine roadway, the outer end of the anti-impact rod piece is fixed on the surface of the coal mine roadway through an anchor seat, and an anchor net connected with the outer end of the anti-impact rod piece is arranged on the surface of the coal mine roadway; the anti-impact rod piece comprises an anchor rod, an outer fixing cylinder, an anti-impact rod and an inner fixing cylinder, the anchor rod is sleeved with the outer fixing cylinder, the anti-impact rod and the inner fixing cylinder, the outer fixing cylinder, the anti-impact rod and the inner fixing cylinder are sequentially connected from outside to inside, the anti-impact rod comprises a first cylinder section and an elastic jacking mechanism, protruding curved strips distributed in the circumferential direction are arranged in the middle of the first cylinder section, and trapezoidal blocks are arranged on the inner surfaces of the protruding curved strips; the elastic jacking mechanism is used for elastically jacking the trapezoidal block; the expansion type anti-impact rod piece is designed and is provided with an air pressure auxiliary elastic energy absorption buffering structure and an elastic buffering structure for elastic deformation of the protruding bent strip and the elastic jacking mechanism, so that the impact ground pressure of the coal mine roadway can be absorbed in time.

Description

Technical Field

[0001] The invention relates to the technical field of coal mine safety, and in particular to a device for preventing and controlling rock burst in a coal mine tunnel. Background Art

[0002] With the continuous mining of coal mines, rock bursts often occur inside coal mine tunnels. When rock bursts occur, they often cause serious damage to the tunnels, damage to equipment, and even casualties, posing a huge threat to mine safety production. At present, anchor rods, anchor nets and other reinforcement structures are generally used. When rock bursts occur, anchor rods are easily broken or fractured. In addition, there are also anchor rods with energy-absorbing structures that give way to absorb energy, but most of them use hydraulic giving way structures for energy absorption and buffering. It is difficult to flexibly change the energy-absorbing structure system of the anchor rod according to the texture structure of the coal mine tunnel that changes with mining. In addition, a large number of hydraulic cylinders are arranged inside the tunnel, affecting the travel of the tunnel, and once a cylinder burst occurs, it is extremely dangerous to the coal mine tunnel.

[0003] Therefore, it is necessary to provide a device for preventing and controlling rock burst in coal mine tunnels to solve the problems raised in the above-mentioned background technology. Summary of the invention

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a coal mine tunnel impact ground pressure prevention and control device, comprising an impact-proof rod member penetrating into the coal mine tunnel, the outer end of the impact-proof rod member is fixed to the surface of the coal mine tunnel through an anchor seat, and an anchor net connected to the outer end of the impact-proof rod member is arranged on the surface of the coal mine tunnel, the impact-proof rod member comprises an anchor rod and an outer fixed tube, an impact-proof rod and an inner fixed tube which are sleeved on the outside of the anchor rod and are arranged in sequence from the outside to the inside, the impact-proof rod comprises a barrel section 1 and an elastic supporting mechanism, the middle part of the barrel section 1 is provided with circumferentially distributed raised curved strips, the inner surface of the raised curved strips is provided with trapezoidal blocks, and the elastic supporting mechanism is used to elastically support the trapezoidal blocks.

[0005] Furthermore, the elastic supporting mechanism includes a barrel segment six and an elastic telescopic segment connected to both ends of the barrel segment one, a barrel segment four is installed on the elastic telescopic segment on the side facing the coal mine tunnel, a barrel segment five is installed on the barrel segment four, the barrel segment six is ​​inserted into the interior of the anti-impact rod, a sealing ring plug located inside the barrel segment four is fixed to the outside of the barrel segment six, a top ball for supporting the trapezoidal block is also installed on the outside of the barrel segment six, and a barrel segment seven is installed on the elastic telescopic segment on the side away from the coal mine tunnel.

[0006] Furthermore, the sealing ring plug is connected to the barrel section five via spring two.

[0007] Furthermore, a sealed cavity is formed between the sealing ring plug and the cylinder cavity of cylinder segment four close to the side of cylinder segment five, a through hole is provided on the cylinder wall of cylinder segment six located in the sealed cavity area, a flow channel three is provided between cylinder segment six and the anchor rod, a flow channel two is provided between the anchor rod and the anti-impact rod, and a flow channel one is provided inside the outer solid cylinder, and the flow channel one, the flow channel two, the flow channel three, the through hole and the sealed cavity are connected to each other, and the flow channel one is connected to an air valve.

[0008] Furthermore, the elastic telescopic section includes barrel section two and barrel section three, the barrel section two is provided with a column groove, the barrel section three is provided with a column rod matching the column groove, the barrel section two and the barrel section three are connected by spring one, the barrel section two is used to connect barrel section one, the barrel section three on the side facing the coal mine tunnel is used to connect barrel section four, and the barrel section three on the side away from the coal mine tunnel is used to connect barrel section seven.

[0009] Furthermore, the top ball can support the inclined surface of the trapezoidal block on the side close to the coal mine tunnel or support the inclined surface of the trapezoidal block on the side away from the coal mine tunnel.

[0010] Furthermore, the anti-impact rod is vertically penetrated along the surface of the coal mine tunnel.

[0011] Furthermore, the anchor rod is a grouting anchor rod, and the gap between the raised curved strips is sealed with an anti-seepage composite fabric surface.

[0012] Furthermore, the lengths of adjacent impact-proof rods are configured differently.

[0013] Furthermore, adjacent anti-shock rods distributed on the cross section of the coal mine tunnel are staggered.

[0014] Compared with the prior art, the present invention provides a device for preventing and controlling rock burst in coal mine tunnels, which has the following beneficial effects: The present invention designs an expansion-type anti-impact rod having an air pressure-assisted elastic energy-absorbing buffer structure and an elastic buffer structure of elastic deformation of raised curved bars and elastic supporting mechanisms, so that the impact ground pressure of coal mine tunnels can be absorbed in time. At the same time, during long-term use, the high-pressure mode and negative-pressure mode of the air pressure-assisted elastic energy-absorbing buffer structure of the anti-impact rod can be changed according to changes in the texture structure of the coal mine. When the hardness of the texture structure inside the coal mine tunnel is relatively low, the negative-pressure mode is adopted, so that the anti-impact rod has a tendency to shrink stress, which is beneficial to strengthening and reinforcing the coal mine tunnel. When the hardness of the texture structure inside the coal mine tunnel is relatively high, the high-pressure mode is adopted, so that the anti-impact rod has a tendency to stretch stress, which is beneficial to the buffering effect of the impact expansion tendency of the coal mine tunnel, thereby making it possible to safely and effectively absorb the impact ground pressure occurring in the coal mine tunnel, and later maintenance and adjustment are also more convenient and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of a device for preventing and controlling rock burst in a coal mine tunnel; Figure 2 It is a schematic diagram of the structure of the impact-proof rod in the present invention; Figure 3 The partial cross-sectional structure of the impact-proof rod of the present invention is shown in FIG. Figure 1 ; Figure 4 The partial cross-sectional structure of the impact-proof rod of the present invention is shown in FIG. Figure 2 ; In the figure: 1. anchor net; 2. anchor seat; 3. impact-proof rod; 31. outer solid cylinder; 32. impact-proof rod; 33. inner solid cylinder; 34. anchor rod; 311. flow channel one; 312. air valve; 341. flow channel two; 321. cylinder section one; 3211. raised curved strip; 3212. trapezoidal block; 3213. anti-seepage composite cloth surface; 322. cylinder section two; 3221. column groove; 323. cylinder section three; 3231. column rod; 3232. spring one; 324. cylinder section four; 3241. sealing chamber; 325. cylinder section five; 326. cylinder section six; 3261. flow channel three; 3262. sealing ring plug; 3263. spring two; 3264. through hole; 3265. top ball; 327. cylinder section seven. DETAILED DESCRIPTION

[0016] Reference Figure 1-Figure 4 The present invention provides a technical solution: a device for preventing and controlling rock burst in a coal mine tunnel, comprising an anti-shock rod 3 penetrating into the interior of the coal mine tunnel, the outer end of the anti-shock rod 3 being fixed to the surface of the coal mine tunnel through an anchor seat 2, an anchor net 1 connected to the outer end of the anti-shock rod 3 being arranged on the surface of the coal mine tunnel, the anti-shock rod 3 comprising an anchor rod 34 and an outer fixed tube 31, an anti-shock rod 32 and an inner fixed tube 33 which are sleeved outside the anchor rod 34 and sequentially connected and arranged from outside to inside, the anti-shock rod 32 comprising a barrel section 1 321 and an elastic supporting mechanism, the middle part of the barrel section 1 321 is provided with circumferentially distributed raised curved strips 3211, the inner surface of the raised curved strips 3211 is provided with a trapezoidal block 3212, and the elastic supporting mechanism is used to elastically support the trapezoidal block 3212; that is, the impact generated in the coal mine tunnel is deformed and energy absorbed by the raised curved strips 3211, and in this embodiment, the raised curved strips 3211 are in the shape of a bow and arrow.

[0017] In this embodiment, the elastic supporting mechanism includes a barrel section six 326 and an elastic telescopic section connected to both ends of the barrel section one 321, a barrel section four 324 is installed on the elastic telescopic section close to the coal mine laneway, a barrel section five 325 is installed on the barrel section four 324, the barrel section six 326 penetrates into the interior of the anti-impact rod 32, a sealing ring plug 3262 located inside the barrel section four 324 is fixed to the outside of the barrel section six 326, a top ball 3265 for supporting the trapezoidal block 3212 is also installed on the outside of the barrel section six 326, and a barrel section seven 327 is installed on the elastic telescopic section away from the coal mine laneway; that is, the raised curved strip 3211 directly absorbs the impact generated by the coal mine laneway, and the raised curved strip 3211 is buffered in the elastic telescopic section, so that the raised curved strip 3211 has a tendency to guide axial deformation, thereby improving the reset characteristics of the raised curved strip 3211 for restoring deformation, which is conducive to the long-term and safe normal use of the raised curved strip 3211.

[0018] The sealing ring plug 3262 is connected to the barrel section five 325 via a spring two 3263 so as to fix the barrel section six 326 in place.

[0019] Among them, a sealed cavity 3241 is formed between the sealing ring plug 3262 and the cylinder cavity of the cylinder section four 324 on the side of the cylinder section five 325, a through hole 3264 is provided on the cylinder wall of the cylinder section six 326 located in the sealed cavity 3241 area, a flow channel three 3261 is provided between the cylinder section six 326 and the anchor rod 34, a flow channel two 341 is provided between the anchor rod 34 and the anti-impact rod 32, and a flow channel one 311 is provided inside the outer solid cylinder 31, and the flow channel one 311, the flow channel two 341, the flow channel three 3261, the through hole 3264 and the sealed cavity 3241 are interconnected, and the flow channel one 311 is connected to the air valve 312; that is, in this embodiment, the effect of air pressure is further combined to enhance the impact resistance and impact resistance safety of the anti-impact rod 32, and at the same time, the anti-impact strength of the anti-impact rod 32 can be flexibly and timely changed by timely regulating the air pressure, and the top ball 3265 supports the trapezoidal block 3212 to drive the raised curved bar 3211 to reset; in addition, in the present embodiment, when the top ball 3265 is located on the inclined plane close to the coal mine tunnel side, the air pressure inside the anti-impact rod 3 is in the high pressure mode, and when the top ball 3265 is located on the inclined plane away from the coal mine tunnel side, the air pressure inside the anti-impact rod 3 is in the negative pressure mode, thereby providing a safer selection mode for changes in the internal structure of the coal mine tunnel caused during the coal mine tunnel mining process, long-term use, and temporary emergencies. For example, when the hardness of the internal texture structure of the coal mine tunnel is relatively low, the negative pressure mode can be adopted, so that the anti-impact rod 3 has a tendency to shrink stress, which is beneficial to the effect of strengthening and reinforcing the coal mine tunnel. When the hardness of the internal texture structure of the coal mine tunnel is relatively high, the high pressure mode can be adopted, so that the anti-impact rod 3 has a tendency to stretch stress, which is beneficial to the buffering effect of the impact expansion tendency of the coal mine tunnel.

[0020] Among them, the elastic telescopic section includes a barrel section two 322 and a barrel section three 323, the barrel section two 322 is provided with a column groove 3221, the barrel section three 323 is provided with a column rod 3231 that cooperates with the column groove 3221, the barrel section two 322 and the barrel section three 323 are connected by a spring one 3232, the barrel section two 322 is used to connect the barrel section one 321, the barrel section three 323 on the side close to the coal mine tunnel is used to connect the barrel section four 324, and the barrel section three 323 on the side away from the coal mine tunnel is used to connect the barrel section seven 327.

[0021] The top ball 3265 can support the inclined surface of the trapezoidal block 3212 on the side close to the coal mine tunnel or support the inclined surface of the trapezoidal block 3212 on the side away from the coal mine tunnel.

[0022] The anti-impact rod 3 is vertically penetrated along the surface of the coal mine tunnel.

[0023] In this embodiment, the anchor rod 34 is a grouting anchor rod, and the gap between the raised curved strips 3211 is sealed with an anti-seepage composite fabric surface 3213. That is to say, the sealing effect of the anti-seepage composite fabric surface 3213 is conducive to preventing the injected slurry from entering the gap between the raised curved strips 3211. The flexible effect of the anti-seepage composite fabric surface 3213 can avoid affecting the elastic deformation of the raised curved strips 3211, and at the same time, the protective effect against the deformation of the raised curved strips 3211 is further enhanced.

[0024] In this embodiment, the lengths of adjacent anti-impact rods 3 are configured differently.

[0025] In this embodiment, adjacent anti-impact rods 32 distributed on the cross section of the coal mine tunnel are staggered.

[0026] In specific implementation, it includes the following steps: S1: Drill holes of different depths vertically on the surface of the coal mine tunnel, and take samples to test the internal texture hardness of the coal mine tunnel; S2: laying an anchor net 1 on the surface of the coal mine tunnel, placing the anti-impact rod 3 into the drilled hole, and fixing the anti-impact rod 3 on the surface of the coal mine tunnel through the anchor seat 2; S3: adjusting the internal air pressure of the anti-impact rod 3 through the air valve 312, selecting a high pressure mode or a negative pressure mode according to the test result of the texture hardness, and performing real-time monitoring; S4: Regularly sample and test the hardness of the material in the coal mine tunnel, and adjust the anti-impact rod 3 in time.

[0027] The above description is only a preferred specific implementation manner of the invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the invention, which should be covered by the protection scope of the present invention.

Claims

1. A device for preventing and controlling rock burst in a coal mine tunnel, comprising an anti-shock rod (3) inserted into the interior of the coal mine tunnel, the outer end of the anti-shock rod (3) being fixed to the surface of the coal mine tunnel via an anchor seat (2), and an anchor net (1) connected to the outer end of the anti-shock rod (3) being arranged on the surface of the coal mine tunnel, characterized in that: The impact-proof rod (3) comprises an anchor rod (34) and an outer fixed tube (31), an impact-proof rod (32) and an inner fixed tube (33) which are sleeved outside the anchor rod (34) and are connected and arranged in sequence from the outside to the inside. The impact-proof rod (32) comprises a tube section 1 (321) and an elastic supporting mechanism. The middle part of the tube section 1 (321) is provided with circumferentially distributed raised curved strips (3211). The inner surface of the raised curved strips (3211) is provided with a trapezoidal block (3212). The elastic supporting mechanism is used to elastically support the trapezoidal block (3212).

2. A device for preventing and controlling rock burst in coal mine tunnels according to claim 1, characterized in that: The elastic supporting mechanism comprises a barrel section six (326) and an elastic telescopic section connected to both ends of the barrel section one (321); a barrel section four (324) is installed on the elastic telescopic section on the side close to the coal mine tunnel; a barrel section five (325) is installed on the barrel section four (324); the barrel section six (326) penetrates into the interior of the anti-impact rod (32); a sealing ring plug (3262) located inside the barrel section four (324) is fixed to the outside of the barrel section six (326); a top ball (3265) for supporting the trapezoidal block (3212) is also installed on the outside of the barrel section six (326); and a barrel section seven (327) is installed on the elastic telescopic section away from the coal mine tunnel.

3. A device for preventing and controlling rock burst in coal mine tunnels according to claim 2, characterized in that: The sealing ring plug (3262) is connected to the barrel section five (325) via spring two (3263).

4. A device for preventing and controlling rock burst in coal mine tunnels according to claim 2, characterized in that: A sealing cavity (3241) is formed between the sealing ring plug (3262) and the cylinder cavity of cylinder section four (324) on the side of cylinder section five (325); a through hole (3264) is provided on the cylinder wall of cylinder section six (326) located in the sealing cavity (3241) area; a flow channel three (3261) is provided between cylinder section six (326) and the anchor rod (34); a flow channel two (341) is provided between the anchor rod (34) and the anti-impact rod (32); a flow channel one (311) is provided inside the outer fixed cylinder (31); the flow channel one (311), the flow channel two (341), the flow channel three (3261), the through hole (3264) and the sealing cavity (3241) are interconnected; and the flow channel one (311) is connected to an air valve (312).

5. The device for preventing and controlling rock burst in coal mine tunnels according to claim 2, characterized in that: The elastic telescopic section comprises a barrel section 2 (322) and a barrel section 3 (323); the barrel section 2 (322) is provided with a column groove (3221); the barrel section 3 (323) is provided with a column rod (3231) matched with the column groove (3221); the barrel section 2 (322) and the barrel section 3 (323) are connected via a spring 1 (3232); the barrel section 2 (322) is used to connect with the barrel section 1 (321); the barrel section 3 (323) on the side facing the coal mine tunnel is used to connect with the barrel section 4 (324); and the barrel section 3 (323) on the side facing away from the coal mine tunnel is used to connect with the barrel section 7 (327).

6. A device for preventing and controlling rock burst in coal mine tunnels according to claim 5, characterized in that: The top ball (3265) can support the inclined surface of the trapezoidal block (3212) on the side close to the coal mine tunnel or support the inclined surface of the trapezoidal block (3212) on the side away from the coal mine tunnel.

7. The device for preventing and controlling rock burst in coal mine tunnels according to claim 1, characterized in that: The impact-proof rod (3) is vertically penetrated along the surface of the coal mine tunnel.

8. The device for preventing and controlling rock burst in coal mine tunnels according to claim 1, characterized in that: The anchor rod (34) is a grouting anchor rod, and the gap between the raised curved strip (3211) is sealed with an anti-seepage composite fabric surface (3213).

9. The device for preventing and controlling rock burst in coal mine tunnels according to claim 1, characterized in that: The lengths of adjacent impact-proof rods (3) are configured differently.

10. The device for preventing and controlling rock burst in coal mine tunnels according to claim 1, characterized in that: Adjacent anti-impact rods (32) distributed on the cross section of the coal mine tunnel are arranged in a staggered manner.

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