High-elasticity bead elastic cable coal wall caving prevention and treatment device
By inserting a high-elastic beaded elastic cable into the coal wall easy-to-sheet part, the stress on the upper part of the coal wall is transferred, the problem of coal wall flap is solved, the coal wall reinforcement is realized, the strength of coal rock mass is significantly improved, and the high cost and environmental pollution problems in the existing technology are avoided.
Patent Information
- Application Number
- CN202420799473.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-17
- Publication Date
- 2025-03-25
- Estimated Expiration
- 2034-04-17
AI Technical Summary
During coal mining, soft coal seams are more likely to have coal wall patch problems, which affects the safety of coal mine production. The existing technologies such as grouting reinforcement method and wood pole reinforcement method have problems such as high cost, complex construction, and environmental pollution.
The coal wall sheet prevention and control device is adopted to inject the high-elastic beaded elastic cable into the coal wall easy-to-elastic beaded elastic cable into the coal wall easy-to-elastic beaded elastic cable to transfer the stress on the upper part of the coal wall to achieve coal wall reinforcement. The device includes a pole head limiter, a central cable, a bead limiter, a bead and a central cable fixer. The central cable runs through the drill hole opened by the coal wall, and the beads are arranged at intervals on the central cable, and preload forces are applied to anchor.
The device is portable, simple to use, strong applicability, can significantly prevent and control coal walls, improve coal rock strength, and avoid problems such as high cost, complex construction and environmental pollution in the existing technology.
Smart Images
Figure CN222668217U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of coal mining, in particular to a high-elastic beaded elastic rope coal wall slab prevention and control device. Background Art
[0002] With the increase in the proportion of coal seams with complex conditions such as soft coal walls, the problem of coal wall spalling, which is more likely to occur in soft coal seams, has emerged one after another during the coal mining process, seriously affecting the safe production of coal mines and threatening the lives of miners.
[0003] At present, most coal mines in China adopt traditional solutions, including grouting reinforcement, wooden anchor reinforcement, and single hydraulic prop support. The advantage of grouting reinforcement is that it can effectively improve the mechanical properties of coal and rock mass and enhance the safety and durability of tunnels; the disadvantages are high cost, complex construction, impact on mining efficiency, and possible environmental pollution. The advantages of wooden pole reinforcement are good flexibility, low cost, simple construction, and no environmental pollution; the disadvantages are low strength, poor durability, easy cutting or corrosion of wooden anchors, and weakened reinforcement effect on coal walls. The equipment used by single hydraulic prop support is large in size and is not suitable for the support of some small tunnels. Utility Model Content
[0004] The utility model overcomes the shortcomings of the prior art and proposes a high-elastic beaded elastic cable coal wall spalling prevention device. By driving the high-elastic beaded elastic cable coal wall spalling prevention device into the part of the coal wall that is prone to spalling, the stress on the upper part of the coal wall can be transferred, thereby achieving the effect of reinforcing the coal wall.
[0005] In order to achieve the above purpose, the utility model is implemented through the following technical solutions.
[0006] A high-elastic bead elastic rope coal wall slab prevention and control device comprises a rod head stopper, a center rope, a bead stopper, beads and a center rope fixer; the front end of the center rope is connected to the rod head stopper, a plurality of beads are arranged on the center rope at intervals, both ends of the beads are provided with bead stoppers, the center rope passes through a drill hole opened in the coal wall, the rod head stopper abuts against the innermost part of the drill hole, and the end of the center rope is connected to the center rope fixer;
[0007] The central cable includes a central cable core and a film-wrapped anchor wrapped around the outside of the cable core. The outer wall of the anchor is wrapped with a soft rubber shell of the central cable, and a plurality of leakage circular holes are opened on the soft rubber shell of the central cable. The beads include a hollow cylinder made of resin material, an arc-shaped protective plate is installed in the center of the hollow cylinder, and the outer wall of the hollow cylinder is against the inner wall of the drilled hole.
[0008] Furthermore, the cable core includes a plurality of steel wires, which are arranged in a honeycomb shape to form a steel wire bundle, and the outside of the steel wire bundle is wrapped with sisal rope.
[0009] Furthermore, four vertical leakage circular holes are arranged in pairs at fixed intervals on the soft rubber shell of the central cable.
[0010] Furthermore, the rod head limiter is composed of a rod head limiter shell, a fixing ring and a center cable fixing groove. A center cable fixing groove is opened on one side of the rod head limiter shell, and the fixing ring is arranged in the center cable fixing groove. The front end of the center cable extends into the center cable fixing groove and is connected with the fixing ring.
[0011] Furthermore, the rod head limiter housing is a cylindrical structure made of resin material.
[0012] Furthermore, the bead limiter is composed of two bead limiter locks and a friction ring. The two bead limiter locks are both arc-shaped, with a bead limiter lock head on each side of the bead limiter lock. The bead limiter lock head is a hollow arc ring piece on one side. The grooves of the two bead limiter lock heads are in different directions. The four bead limiter lock heads overlap in pairs to form a complete ring, and a friction ring is glued to the inner wall of the bead limiter lock.
[0013] Furthermore, the center cable fixer includes a fixing screw, a sponge filler, and a fixer resin shell; screw holes are evenly penetrated on the surface of the fixer resin shell, threads are engraved inside the screw holes and are connected to the fixing screws, the center of the fixer resin shell is filled with a sponge filler, and a layer of sponge material center cable protection soft film is left in the center, and the center cable protection soft film is located on the outer wall of the center cable.
[0014] Furthermore, the resin shell of the fixture is a short hollow cylinder made of resin material, and three screw holes are evenly penetrated through the outer surface of the resin shell of the fixture, and the vertical spacing angle of the screw holes is 120°.
[0015] The beneficial effects of the utility model compared with the prior art are:
[0016] The utility model is portable, simple to use, highly applicable, and has remarkable effects, and can prevent and control coal wall spalling, thereby improving the strength of the coal rock mass. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the structure of a high-elastic beaded elastic cable;
[0018] Figure 2 is a top view of the club head stopper;
[0019] Figure 3 is a cross-sectional view of a rod head stopper;
[0020] Figure 4 is a cross-sectional view of a bead;
[0021] Figure 5 It is a structural schematic diagram of a bead limiter;
[0022] Figure 6 This is an exploded view of the bead stopper;
[0023] Figure 7 is the cross-section of the central cable;
[0024] Figure 8 is a cross-sectional view of the center cable retainer;
[0025] In the figure:
[0026] 1-rod head limiter; 2-center rope; 3-bead limiter; 4-beads; 5-center rope fixer; 6-coal wall; 7-drill hole; 8-fixing ring; 9-center rope fixing groove; 10-rod head limiter shell; 11-hollow cylinder; 12-arc guard plate; 13-bead limiter lock; 14-friction ring; 15-bead limiter lock; 16-center rope soft rubber shell; 17-leakage round hole; 18-sisal rope; 19-steel wire; 20-anchor; 21-fixing screw; 22-screw hole; 23-sponge filling; 24-fixer resin shell; 25-center rope protective soft film. DETAILED DESCRIPTION
[0027] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail in combination with the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention. The technical solution of the present invention is described in detail below in combination with the embodiments and the accompanying drawings, but the scope of protection is not limited thereto.
[0028] like Figures 1 to 8 As shown, this embodiment provides a high-elastic bead elastic rope coal wall flap prevention and control device, including a rod head limiter 1, a center rope 2, a bead limiter 3, beads 4, and a center rope fixer 5.
[0029] The rod head stopper 1 is connected to the top of the center cable 2, and the rod head stopper 1 is composed of a rod head stopper housing 10, a fixing ring 8 and a center cable fixing groove 9, wherein the rod head stopper housing 10 is a resin material cylinder with a hollow circular hole on one side, and the fixing ring 8 is an inner ring made of a high friction coefficient material, which is installed in the hollow circular hole of the rod head stopper housing 10, and the hollow part thereof constitutes the center cable fixing groove 9. The rod head stopper 1 is used to fix the top position of the center cable 2.
[0030] The center rope 2 runs through the entire borehole 7. The center rope 2 is a cuttable rope structure. The center of the center rope 2 is composed of 18-20 thin steel wires 19 arranged in a honeycomb shape to form a steel wire bundle. The outside of the steel wire bundle is wrapped with a sisal rope 18. The outermost layer of the center rope is a center rope soft rubber shell 16. The gap between the center rope soft rubber shell 16 and the sisal rope 18 is a cylindrical film-filled anchor 20. The center rope soft rubber shell 16 is pierced with four two-two vertical leakage circular holes 17 every 5 cm. The center rope 2 is used to string beads 4 together. When subjected to pre-tightening force, the anchor 20 can overflow from the circular holes to achieve an anchoring effect.
[0031] The bead stopper 3 is located in front and behind the beads 4 and is used to limit the sliding of the beads 4. The bead stopper 3 is composed of two bead stopper locks 15 and a friction ring 14. The two bead stopper locks 15 are both in the shape of circular arc rings. There is a bead stopper lock head 13 on each side of the bead stopper lock 15. The bead stopper lock head 13 is a circular arc ring sheet with one side hollow. The grooves of the two bead stopper lock heads 13 are in different directions. The four lock heads overlap in pairs to form a complete ring. The inner ring of the lock is adhered with a friction ring 14 made of a material with a high friction coefficient. The device is used to limit the position of the beads 4 and maintain the spacing of the beads 4.
[0032] A plurality of beads 4 are located on the central cable 2, and the interval between two adjacent beads 4 is 1m. The bead 4 is a hollow cylinder 11 made of resin material, and an arc-shaped guard plate 12 is installed in the center of the hollow cylinder 11. Since the strength of the beads 4 is higher than that of soft coal rock, after the device is driven into the coal wall, the stress-strain curve of the upper layer of the coal wall can be changed, and the formation of the pressurized zone can be delayed. The beads 4 are used to enhance the strength of the coal wall and slow down the spalling of the coal wall. The spacing of the beads 4 can be adjusted according to the on-site conditions.
[0033] The center cable fixer 5 is located near the drill hole, and is composed of a fixing screw 21, a screw hole 22, a sponge filler 23, a center cable protective soft film 25, and a fixer resin shell 24. The fixer resin shell 24 is a short hollow cylinder made of resin material, and three screw holes 22 are evenly penetrated on the outer surface of the cylinder. The vertical spacing angle of the screw holes 22 is 120°, and the surface is concave inwardly, and the inside is engraved with threads for screwing into the fixing screw 21. The center of the fixer resin shell 24 is filled with a sponge filler 23, and a layer of center cable protective soft film 25 made of sponge material is left in the center. The center cable fixer 5 is used to fix the center cable 2 at the end.
[0034] The rod head limiter 1, the center cable 2, the bead limiter 3, the beads 4, and the center cable fixer 5 can all be disassembled and reassembled.
[0035] The method for using the high-elastic bead elastic rope coal wall slab prevention and control device mainly includes the following steps:
[0036] S1. Preparation: Stop the mining unit at the working face and mark the drilling position on the upper part of the coal wall;
[0037] S2, drilling: vertically drilling a borehole 7 in the upper part of the coal wall of the working face;
[0038] S3. Assemble the high-elastic bead elastic rope coal wall slab prevention and control device: first insert the end of the center rope 2 into the rod head limiter 1, then string the beads 4 in sequence at intervals of 1m, buckle the bead limiters 3 in front and behind the beads 4, and finally cut the center rope 2 according to the length of the drill hole 7.
[0039] S4, application device: put the high-elastic beaded elastic rope into the drill hole 7, and the outside of the drill hole 7 does not need to be fixed.
[0040] S5. Apply pre-tightening force: Apply a certain pre-tightening force to the center cable 2. The center cable soft rubber shell 16 of the center cable 2 is stretched by the force, and the internal space is compressed, thereby destroying the soft film wrapped around the anchor 20 inside, and causing the anchor 20 to overflow from the leakage hole 17 into the borehole 7. Because the anchor 20 overflows from the leakage hole 17 almost at the same time, there is no need to use multiple stages of anchors with different speeds, and only the same anchor can be used.
[0041] S6, finishing device: Figure 1 As shown, after observing that the anchor 20 has roughly filled the borehole 7 and the amount of the anchor 20 is no longer increasing, the application of the preload force is stopped, the portion of the center cable 2 that has been elongated due to stretching and protrudes out of the borehole 7 is cut off, and the center cable fixture 5 is inserted near the end of the center cable 2.
[0042] S7. Repeat steps: Repeat S1-S6 every time the working surface advances five meters.
[0043] The above content is a further detailed description of the utility model in combination with a specific preferred implementation method. It cannot be determined that the specific implementation methods of the utility model are limited to this. For ordinary technicians in the technical field to which the utility model belongs, they can make several simple deductions or substitutions without departing from the utility model, which should be regarded as belonging to the utility model and the scope of patent protection determined by the submitted claims.
Claims
1. A high-elastic beaded elastic rope coal wall slab prevention and control device, characterized in that: The invention comprises a rod head stopper (1), a center rope (2), a bead stopper (3), beads (4) and a center rope fixing device (5); the front end of the center rope (2) is connected to the rod head stopper (1); a plurality of beads (4) are arranged on the center rope (2) at intervals; both ends of the beads (4) are provided with bead stoppers (3); the center rope (2) passes through a borehole (7) opened in the coal wall; the rod head stopper (1) abuts against the innermost part of the borehole (7); and the center rope (2) is connected to the center rope fixing device (5) near the end thereof; The central cable (2) comprises a central cable core and a film-wrapped anchor (20) wrapped around the cable core, the outer wall of the anchor (20) is wrapped with a central cable soft rubber shell (16), and a plurality of leakage holes (17) are provided on the central cable soft rubber shell (16); the bead (4) comprises a hollow cylinder (11) made of resin material, an arc-shaped protective plate (12) is installed at the center of the hollow cylinder (11), and the outer wall of the hollow cylinder (11) is against the inner wall of the drill hole (7).
2. A high-elastic beaded elastic rope coal wall slab prevention and control device according to claim 1, characterized in that: The cable core comprises a plurality of steel wires (19), the plurality of steel wires (19) being arranged in a honeycomb shape to form a steel wire bundle, and the outside of the steel wire bundle is wrapped with a sisal rope (18).
3. The high-elastic beaded elastic rope coal wall slab prevention and control device according to claim 1 is characterized in that: Four circular holes (17) for leakage are arranged vertically in pairs at fixed intervals on the soft rubber outer shell (16) of the central cable.
4. The high-elastic beaded elastic rope coal wall slab prevention and control device according to claim 1 is characterized in that: The rod head stopper (1) is composed of a rod head stopper housing (10), a fixing ring (8) and a center cable fixing groove (9). A center cable fixing groove (9) is provided on one side of the rod head stopper housing (10). The fixing ring (8) is arranged in the center cable fixing groove (9). The front end of the center cable (2) extends into the center cable fixing groove (9) and is connected to the fixing ring (8).
5. A high-elastic beaded elastic rope coal wall slab prevention and control device according to claim 4, characterized in that: The rod head stopper housing (10) is a cylindrical structure made of resin material.
6. The high-elastic beaded elastic rope coal wall slab prevention and control device according to claim 1 is characterized in that: The bead stopper (3) is composed of two bead stopper locks (15) and a friction ring (14). The two bead stopper locks (15) are both in the shape of an arc ring. There is a bead stopper lock head (13) on each side of the bead stopper lock (15). The bead stopper lock head (13) is a hollow arc ring sheet on one side. The grooves of the two bead stopper lock heads (13) are in different directions. The four bead stopper lock heads (13) overlap in pairs to form a complete ring. The friction ring (14) is adhered to the inner wall of the bead stopper lock (15).
7. The high-elastic beaded elastic rope coal wall slab prevention and control device according to claim 1 is characterized in that: The center cable fixer (5) comprises a fixing screw (21), a sponge filler (23), and a fixer resin shell (24); the surface of the fixer resin shell (24) is evenly penetrated with screw holes (22), the screw holes (22) are engraved with threads and connected to the fixing screws (21), the center of the fixer resin shell (24) is filled with the sponge filler (23), and a layer of sponge center cable protection soft film (25) is left in the center, and the center cable protection soft film (25) is located on the outer wall of the center cable (2).
8. The high-elastic beaded elastic rope coal wall slab prevention and control device according to claim 7 is characterized in that: The resin housing (24) of the fixer is a short hollow cylinder made of resin material. Three screw holes (22) are evenly penetrated through the outer surface of the resin housing (24) of the fixer. The vertical spacing angle of the screw holes (22) is 120°.