Gob-side entry retaining roof anchor cable protection device

Abstract

The utility model discloses a gob-side entry retaining roof anchor cable protection device which comprises a protection pad, an anchor hiding hole is formed in the center of the protection pad, an anchor cable lock is sleeved with the anchor hiding hole, the anchor cable lock is connected with an anchor cable, the tail end of the anchor cable extends into the protection pad through the anchor cable lock, an anchor cable tray is arranged on the protection pad, a through hole is formed in the center of the anchor cable tray, and the anchor cable is sleeved with the through hole. The anchor cable tray is sleeved with the anchor cable lock, and the anchor cable lock is located between the anchor cable tray and the protection pad. Opposite-penetrating positioning holes are formed in the peripheral edge of the protection pad, flexible binding ropes are arranged in the opposite-penetrating positioning holes, and the protection pad is fixedly connected with the top plate mesh through the opposite-penetrating positioning holes and the flexible binding ropes arranged on the protection pad. The problems that in the prior art, a forepoling repeatedly supports a top plate, secondary damage is caused to the top plate and an anchor rod cable support, and secondary maintenance of the gob-side entry retaining top plate is not facilitated are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of non-coal pillar mining in underground coal mines and relates to an anchor cable protection device for a roof plate of a gob-side lane retaining. Background Art

[0002] Gob-side lane retention is to retain the transport drift or return air drift behind the mined working face along the gob area as the drift for the next working face. Gob-side lane retention without coal pillar mining is an advanced coal mining technology that improves the recovery rate of coal resources, reduces the amount of tunnel excavation, improves tunnel maintenance, controls gas over-limit, improves mine safety production and improves the technical and economic effects of mines.

[0003] With the promotion of gob-side lane retaining technology in underground coal mines, the return air chute and transport chute of the traditional mining face are generally arranged with advance supports within the advance influence range of mining to protect the roof from damage caused by dynamic pressure. The advance supports continue to move forward and support as the working face advances, but the advance supports will repeatedly support the roof when moving, causing secondary damage to the roof and anchor cable support; and the current mining method does not retain the lane after mining, which will result in the abandonment of the gob area. However, the gob-side lane retaining technology requires that the lane be retained after the working face is mined. Therefore, the advance supports repeatedly support the roof, which is not conducive to the secondary maintenance of the roof of the gob-side lane retaining, and will increase the risk of lane retaining failure. Utility Model Content

[0004] The utility model aims to provide an anchor cable protection device for the roof of the gob-retained tunnel, which solves the problem that the prior art advance bracket repeatedly supports the roof, causing secondary damage to the roof and anchor cable support, which is not conducive to the secondary maintenance of the roof of the gob-retained tunnel.

[0005] The technical scheme adopted by the utility model is an anchor cable protection device for the roof of an empty tunnel, comprising a protection pad, an anchor hole is provided in the center of the protection pad, an anchor cable lock is sleeved in the anchor hole, the anchor cable lock is connected to the anchor cable, the end of the anchor cable extends into the protection pad through the anchor cable lock, an anchor cable tray is arranged on the protection pad, a through hole is provided in the center of the anchor cable tray, the anchor cable is sleeved in the through hole, the anchor cable tray is sleeved with the anchor cable lock, and the anchor cable lock is located between the anchor cable tray and the protection pad; through positioning holes are provided around the edges of the protection pad, flexible binding ropes are provided in the through positioning holes, and the flexible binding ropes are used to fix the protection pad to the roof mesh through the through positioning holes and the flexible binding ropes provided on the protection pad.

[0006] The utility model is also characterized in that:

[0007] The anchor cable tray is tightly attached to the upper surface of the extruded protection pad, the anchor cable lock is pre-tightened, and the thickness of the protection pad is not less than the length of the exposed section of the anchor cable.

[0008] An advance bracket is arranged directly below each protection pad, and an advance bracket top beam is arranged on the advance bracket. The area of ​​the protection pad is the same as the upper surface of the advance bracket top beam.

[0009] The anchor hole vertically penetrates the protection pad, the hole diameter of the anchor hole is not less than the diameter of the anchor cable lock, and the center position of the anchor hole is determined according to the relative position of the advance support top beam and the top plate anchor cable.

[0010] The protective pad is made of rectangular rubber material.

[0011] The anchor cable is composed of several twisted steel strands.

[0012] The beneficial effects of the utility model are as follows: the utility model adopts protective measures for the roof and the roof anchor cable of the gob-side tunnel, and when the advance support of the working face moves and supports, the top beam of the advance support does not directly contact the roof anchor cable lock, but directly contacts the anchor cable protection device, which increases the contact area and is conducive to the stability of the anchor cable combined with the advance support support structure system. At the same time, the anchor cable protection device has a shock-absorbing and impact-resistant effect, which reduces the damage to the anchor cable lock and the loss of prestress. In particular, the use of this technology is conducive to the secondary maintenance of the roof of the gob-side tunnel in the fully mechanized caving mining working face and the rock burst working face. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the roof anchor cable protection device for gob-side tunnel retaining of the utility model;

[0014] Figure 2 This is a schematic diagram of the overall cross-sectional structure of the roof anchor cable protection device for gob-side tunnel retaining of the utility model;

[0015] Figure 3 This is a cross-sectional view of the functional relationship between the advanced support and the anchor cable protection device of the utility model.

[0016] In the figure, 1. anchor cable, 2. anchor cable tray, 3. protection pad, 4. anchor cable lock, 5. anchor hole, 6. through positioning hole, 7. flexible binding rope, 8. top plate mesh, 9. advance support, 10. advance support top beam. DETAILED DESCRIPTION

[0017] The utility model is described in detail below with reference to the accompanying drawings and specific implementation modes.

[0018] Example 1

[0019] The utility model discloses a roof anchor cable protection device for gob-side tunnel retaining, the structure of which is as follows Figure 1 and Figure 2As shown, it includes a protection pad 3, an anchor hole 5 is provided in the center of the protection pad 3, an anchor cable lock 4 is sleeved in the anchor hole 5, the anchor cable lock 4 is connected to the anchor cable 1, the end of the anchor cable 1 extends into the protection pad 3 through the anchor cable lock 4, an anchor cable tray 2 is arranged on the protection pad 3, a through hole is provided in the center of the anchor cable tray 2, the anchor cable 1 is sleeved in the through hole, the anchor cable tray 2 is sleeved with the anchor cable lock 4, and the anchor cable lock 4 is located between the anchor cable tray 2 and the protection pad 3; through positioning holes 6 are provided on the edges of the protection pad 3, and flexible binding ropes 7 are provided in the through positioning holes 6. The flexible binding ropes 7 fix the protection pad 3 to the top plate mesh 8 through the through positioning holes 6 and the flexible binding ropes 7 provided on the protection pad 3, and an advanced bracket 9 is correspondingly provided directly below each protection pad 3, and an advanced bracket top beam 10 is provided on the advanced bracket 9. The impact pressure of the top plate is evenly distributed to the advanced bracket top beam 10 through the protection pad 3, and the force-bearing area is increased, which helps to make the initial support force of the advanced bracket 9 effective and stable.

[0020] Example 2

[0021] The anchor cable tray 2 is tightly pressed against the upper surface of the extrusion protection pad 3, and the anchor cable lock 4 is pre-tightened to improve the bearing capacity and support effect of the anchor cable 1. The thickness of the protection pad 3 is not less than the length of the exposed section of the anchor cable 1, and the area of ​​the protection pad 3 is the same as the upper surface of the advance support top beam 10. The anchor hole 5 vertically penetrates the protection pad 3, and the hole diameter of the anchor hole 5 is not less than the diameter of the anchor cable lock 4. The center position of the hole is determined according to the relative position of the advance support top beam 10 and the top plate anchor cable.

[0022] Example 3

[0023] On the basis of Example 2, the protection pad 3 is made of rectangular rubber material, and the rubber material has the characteristics of shock absorption, impact resistance, pressure resistance and high hardness.

[0024] The anchor cable 1 is composed of a plurality of twisted steel strands.

[0025] The working principle of the anchor cable protection device for the roof of the goaf-retained tunnel of the utility model is that the center of the protection pad 3 is vertical and penetrates the anchor hole 5 on both sides, and the anchor cable lock 4 is sleeved through the anchor hole 5. When the advance support 9 is moved, the top beam 10 of the advance support does not directly contact the anchor cable lock 4, and will not cause damage to the overall structure of the anchor cable 1 on the roof. At the same time, the protection pad 3 has a shock-absorbing and energy-consuming effect. The impact pressure of the roof is evenly distributed to the top beam 10 of the advance support through the protection pad 3, and the force-bearing area is increased, which helps the initial support force of the advance support 9 to be effective and stable. With the advancement of non-stage mining, when the advance support 9 repeatedly supports and moves and no longer covers the anchor cable 1 above the roof, the anchor cable protection device for the roof of the goaf-retained tunnel of the utility model is removed behind the advance support 9 and reused forward in a cycle.

[0026] Example 4

[0027] The coal seam of a certain mine is buried 500m deep, 6m thick, and 3m thick. The fully mechanized caving mining is carried out in the form of a mining-to-cavity ratio of 1:1. A lane is left along the goaf in the belt conveyor chute, and after the lane is left, it is used as the return air chute of the next working face.

[0028] The advance support 9 is arranged within 30m of the belt conveyor chute, and the advance support top beam 10 is arranged on the advance support 9. The width of the advance support top beam 10 is 900mm. Four anchor cables 1 are set in each row of the top plate of the belt conveyor chute, and the exposed length of the anchor cables 1 is 150mm. Two of the anchor cables 1 are located exactly at the center of the advance support top beam 10. In order to reduce the secondary damage to the top plate support structure caused by repeated support during the movement of the advance support 9, the protective measures of the utility model are adopted for the top plate anchor cables.

[0029] The working process of the utility model of the roof anchor cable protection device along the gob-side tunnel is as follows: Figure 3 As shown, the protection pad 3 is made of rectangular rubber material, and the processing size of the protection pad 3 is: 900mm (length) × 900mm (width) × 150mm (height); the anchor cable 1 on the roof is located at the center line position of the advance support top beam 10, the anchor hole 5 is arranged in the center of the protection pad 3, and the four corners of the protection pad 3 are arranged with through positioning holes 6; 30m away from the overdue impact range of the mining working face, the protection pad 3 is covered with the anchor cable lock 4 through the anchor hole 5, and the top surface of the protection pad 3 is close to the anchor cable tray 2; two flexible binding ropes 7 pass through the through positioning holes 6 on the rubber pad to respectively bind and fix the protection pad 3 to the roof mesh 8; the advance support 9 is lowered to below the same horizontal line of the protection pad 3, and then the advance support 9 is moved forward. When the moving is completed and it is ensured that the advance support top beam 10 completely covers the protection pad 3, the frame is lifted in time to make the advance support top beam 10 fully contact with the protection pad 3 until the initial support state is reached. As the mining progresses, when the advanced support 9 repeatedly supports and moves and no longer covers the anchor cable 1 above the roof, the rear side of the utility model along the empty roadway roof anchor cable protection device is promptly removed and installed and used in a forward cycle, thus completing an installation and disassembly cycle.

[0030] The utility model provides an anchor cable protection device for the roof of the gob-side tunnel. The protection pad covers the anchor cable anchor through the anchor hole. The top surface of the protection pad is close to the anchor cable tray. The flexible binding rope passes through the through positioning holes on the protection pad to fix the protection pad to the roof mesh. When the advance support is moved, the top beam of the advance support does not directly contact the anchor cable lock, and will not cause damage to the overall structure of the roof anchor cable. At the same time, the rubber protection pad has a shock-absorbing and energy-consuming effect. The impact pressure of the roof is evenly distributed to the top beam of the advance support through the rubber protection pad. The force-bearing area is increased, which helps the initial support force of the advance support to be effective and stable, thereby ensuring the safety of construction.

Claims

1. The roof anchor cable protection device for gob-side entry retention is characterized by: The invention comprises a protection pad (3), wherein an anchor hole (5) is provided at the center of the protection pad (3), an anchor cable lock (4) is sleeved in the anchor hole (5), the anchor cable lock (4) is connected to the anchor cable (1), the end of the anchor cable (1) extends into the protection pad (3) through the anchor cable lock (4), an anchor cable tray (2) is arranged on the protection pad (3), a through hole is provided at the center of the anchor cable tray (2), the anchor cable (1) is sleeved in the through hole, the anchor cable tray (2) is sleeved with the anchor cable lock (4), and the anchor cable lock (4) is located between the anchor cable tray (2) and the protection pad (3); through positioning holes (6) are provided at the edges of the protection pad (3), a flexible binding rope (7) is arranged in the through positioning holes (6), and the flexible binding rope (7) is used to fix the protection pad (3) to the top plate mesh (8) through the through positioning holes (6) and the flexible binding rope (7) provided on the protection pad (3).

2. The roof anchor cable protection device for gob-side entry retaining according to claim 1 is characterized in that: The anchor cable tray (2) is tightly pressed against the upper surface of the compression protection pad (3), the anchor cable lock (4) is pre-tightened, and the thickness of the protection pad (3) is not less than the length of the exposed section of the anchor cable (1).

3. The roof anchor cable protection device for gob-side entry retaining according to claim 1 is characterized in that: An advance bracket (9) is correspondingly arranged directly below each protection pad (3), an advance bracket top beam (10) is arranged on the advance bracket (9), and the area of ​​the protection pad (3) is the same as the upper surface of the advance bracket top beam (10).

4. The roof anchor cable protection device for gob-side entry retaining according to claim 1 is characterized in that: The anchor hole (5) vertically penetrates the protection pad (3), the hole diameter of the anchor hole (5) is not less than the diameter of the anchor cable lock (4), and the center position of the anchor hole (5) is determined according to the relative position of the advance support top beam (10) and the top plate anchor cable.

5. The roof anchor cable protection device for gob-side entry retaining according to claim 1 is characterized in that: The protection pad (3) is made of rectangular rubber material.

6. The roof anchor cable protection device for gob-side entry retaining according to claim 1 is characterized in that: The anchor cable (1) is composed of a plurality of twisted steel strands.

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