Strengthening and supporting device for assisting air inlet roadway

Abstract

The utility model discloses an auxiliary air inlet roadway reinforcing support device, which comprises reinforcing anchor cables, a constant resistance device and a W-shaped steel belt, each section adopts six reinforcing anchor cables, four reinforcing anchor cables are arranged at the top of one trapezoidal section of a roadway, and two reinforcing anchor cables are arranged at the side part of one trapezoidal section of the roadway and are positioned on a real coal side; the end of a reinforcing anchor cable at the top of a roadway is fixedly connected with one end of a constant-resistance device, the other end of the constant-resistance device is fixedly connected to a W-shaped steel belt, the W-shaped steel belt is arranged at the top of the roadway, the W-shaped steel belt, the constant-resistance device and the reinforcing anchor cable form a reinforcing support, original anchor rods and original anchor cables are further included, and the row distance between original anchor rod supports is 750 * 800 mm; the row distance between original anchor cable supports is 1500 * 1600 mm, and the original anchor cable supports are arranged in the three-zero-three direction. Under the existing supporting condition, the reinforcing anchor cable, the constant resistance device and the W-shaped steel belt are additionally arranged to form a reinforcing structure, the reinforcing structure can adapt to the anchoring mode of deformation of the top plate, and it is guaranteed that the pressure of the top plate can be slowly transferred to goaf gangue.

Description

Technical Field

[0001] The utility model relates to an auxiliary air intake tunnel reinforcement support device, belonging to the technical field of mine tunnel support equipment. Background Art

[0002] According to the "top cutting short arm beam" theory, that is, using the mine pressure, directional top cutting is carried out on the goaf side to cut off the mine pressure transmission of part of the roof, and then using the roof rock pressure and part of the roof rock mass to achieve automatic lane formation and non-coal pillar mining, forming the top cutting pressure relief automatic lane formation and non-coal pillar mining technology, and it was successfully applied on site for the first time in the 2442 working face of Baijiao Coal Mine of Sichuan Coal Group in 2010. At the same time, the top cutting pressure relief automatic lane formation technology was proposed to achieve longwall mining along the goaf, that is, to recover a working face, only one laneway needs to be excavated, and another laneway is automatically formed, eliminating the section coal pillar, and realizing non-coal pillar mining. The characteristics of the goaf along the goaf can be summarized as "five utilizations, three reductions, and two goals", that is, using the mine pressure, using part of the roof rock mass, using the rock crushing and expansion characteristics, using the original lane space, using the original lane support, reducing periodic pressure, reducing goaf gas, reducing coal seam spontaneous combustion, and realizing automatic lane formation and non-coal pillar mining.

[0003] To achieve the above goals, it is necessary to use a special blasting method to cut off the tunnel roof, and at the same time use an anchoring method that can adapt to the deformation of the roof to reinforce the tunnel roof, so as to ensure that the roof pressure can be slowly transferred to the goaf. The existing trapezoidal cross-section tunnels are arranged with anchor support, with a row spacing of 750×800mm between anchors and 1500×1600mm between anchor cable supports, in a "three-zero-three" arrangement. Figure 1-2 As shown, the component parameters used are as follows:

[0004] 1) Anchor rod: Anchor rod specification is Φ=20mm, L=2300mm;

[0005] 2) Anchor cable: Anchor cable specifications are Φ=17.8mm, L=7300mm;

[0006] 3) Pallet: The specifications of the anchor pallet are square prestressed pallets of 120×120×10mm, and the specifications of the anchor cable pallet are 200×200×15mm.

[0007] 4) Anchor net: high-strength hexagonal steel wire mesh for mining, mesh diameter 70mm×70mm, width 1000mm, steel wire diameter 2mm, mesh length 30m / roll.

[0008] 5) Anchor: The anchor model is MSK2350. Both the top anchor and the auxiliary anchor use 2 sections of anchor, and each anchor cable uses 3 sections of anchor. Summary of the invention

[0009] The technical problem to be solved by the utility model is to provide an auxiliary air intake tunnel reinforcement support device to solve the problems existing in the above-mentioned prior art.

[0010] The technical solution adopted by the utility model is: an auxiliary air intake tunnel reinforced support device, including reinforcing anchor cables, constant resistors and W-shaped steel belts, 6 reinforcing anchor cables are used for each section, among which 4 reinforcing anchor cables are arranged at the top of a trapezoidal section of the tunnel, and 2 reinforcing anchor cables are arranged at the side of a trapezoidal section of the tunnel and are located on the solid coal side, the end of the reinforcing anchor cable at the top of the tunnel is fixedly connected to one end of the constant resistor, and the other end of the constant resistor is fixedly connected to the W-shaped steel belt, the W-shaped steel belt is arranged at the top of the tunnel and constitutes a reinforced support with the constant resistor and the reinforcing anchor cable, and also includes original anchor rods and original anchor cables, the original anchor rod support spacing is 750×800mm; the original anchor cable support spacing is 1500×1600mm, and is arranged in a "three-zero-three" direction.

[0011] Furthermore, among the four reinforcing anchor cables at the top of the above-mentioned tunnel, one close to the real coal side has an angle of 15° with the normal of the roof and is located at the left shoulder angle of the roof, and the other three are arranged vertically. The reinforcing anchor cable at the top of the tunnel is φ21.6×9300mm. Among the two reinforcing anchor cables at the side of the tunnel, one close to the bottom plate has an inclination angle of -12°, and the other one is arranged horizontally. The reinforcing anchor cable at the side of the tunnel is φ21.6×4300mm.

[0012] Furthermore, the four reinforcing anchor cables at the top of each of the above-mentioned trapezoidal sections start from the goaf side, the first reinforcing anchor cable is 500mm away from the goaf wall, the second reinforcing anchor cable is 900mm away from the first reinforcing anchor cable, the third reinforcing anchor cable is 1225mm away from the second reinforcing anchor cable, the fourth reinforcing anchor cable is 1500mm away from the third reinforcing anchor cable, and the fourth reinforcing anchor cable is 630mm away from the real coal wall, and the spacing between the four reinforcing anchor cables is 800mm.

[0013] Furthermore, the reinforcement anchor cables on the side of the tunnel are arranged in two rows, with a spacing of 800×1600mm between the rows.

[0014] Beneficial effects of the utility model: Compared with the prior art, the utility model adds reinforcing anchor cables, constant resistors and W-shaped steel belts to the existing support conditions to form a reinforcement structure, which can adapt to the anchoring method of roof deformation and ensure that the roof pressure can be slowly transferred to the goaf gangue. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the original air intake tunnel support cross-section diagram;

[0016] Figure 2 This is the original support plan of the air intake tunnel;

[0017] Figure 3It is a schematic diagram of the cross-sectional structure of the auxiliary air intake tunnel reinforcement support device;

[0018] Figure 4 It is a schematic diagram of the plane structure of the auxiliary air intake tunnel reinforcement support device;

[0019] Figure 5 It is a schematic diagram of the W-shaped steel belt structure. DETAILED DESCRIPTION

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] Example 1: Figure 3-5 As shown, an auxiliary air intake lane reinforcement support device comprises a reinforcement anchor cable 1, a constant resistor 2 and a W-shaped steel belt 3. Six reinforcement anchor cables 1 are used for each section, wherein four reinforcement anchor cables are arranged at the top of a trapezoidal section of a lane 5, and two reinforcement anchor cables are arranged at the side of a trapezoidal section of the lane and located on the solid coal side. The end of the reinforcement anchor cable 1 at the top of the lane is fixedly connected to one end of the constant resistor 2, and the other end of the constant resistor 2 is fixedly connected to the W-shaped steel belt 3 through a tray 4 and a nut. The W-shaped steel belt is arranged at the top of the lane and forms a reinforcement support with the constant resistor and the reinforcement anchor cable. The W-shaped steel belt 3 is fixed by compression at its compression position 9; it also comprises an original anchor rod 6 and an original anchor cable 7, the support spacing of the original anchor rod 6 is 750×800mm; the support spacing of the original anchor cable 7 is 1500×1600mm, and they are arranged in a "three-zero-three" direction; the reinforcement support device and the original anchoring structure stroke coordinated anchoring design scheme.

[0022] Necessary materials for collaborative anchoring design and construction

[0023] ①Φ21.6×9300mm anchor cable with 300×300×20mm tray (center hole φ100mm);

[0024] ②Φ21.6×4300mm anchor cable with 300×300×20mm tray (center hole φ30mm);

[0025] ③2700×300mmW steel strip;

[0026] ④HZS35-300-0.5 constant resistor

[0027] ⑤MSZ2550 medium speed anchoring agent;

[0028] ⑥MSK2550 fast anchoring agent;

[0029] The original spacing between anchor rod supports in this tunnel was 750×800mm; the spacing between anchor cable supports was 1500×1600mm, arranged in a “303” pattern.

[0030] The original support method of this tunnel was coordinated support by anchor rods, anchor cables, anchor nets, and W-shaped steel belts, and it had a trapezoidal cross-section. Now, the original support method uses anchor cables with constant resistors and W-shaped steel belts to strengthen the support. The anchor cables on the right side of the roof are constructed vertically, and the blasting top cutting technology is used to facilitate smooth top cutting when the roof collapses after the 120905 mining face is mined, thereby more completely preserving the 120905 auxiliary air intake tunnel.

[0031] Among them, among the 4 reinforcing anchor cables at the top of the above-mentioned tunnel, the one close to the real coal side has an angle of 15° with the normal line of the roof and is located at the left shoulder angle of the roof, and the other 3 are arranged vertically. The reinforcing anchor cable at the top of the tunnel is φ21.6×9300mm. Among the 2 reinforcing anchor cables at the side of the tunnel, the one close to the bottom plate has an inclination angle of -12°, and the other one is arranged horizontally. The reinforcing anchor cable at the side of the tunnel is φ21.6×4300mm.

[0032] Among them, the four reinforcing anchor cables at the top of each trapezoidal section start from the goaf side, the first reinforcing anchor cable is 500mm away from the goaf wall, the second reinforcing anchor cable is 900mm away from the first reinforcing anchor cable, the third reinforcing anchor cable is 1225mm away from the second reinforcing anchor cable, the fourth reinforcing anchor cable is 1500mm away from the third reinforcing anchor cable, and the fourth reinforcing anchor cable is 630mm away from the real coal wall. The spacing between the four reinforcing anchor cables is 800mm.

[0033] Among them, the reinforcement anchor cables on the side of the above-mentioned tunnel are arranged in 2 rows, with the spacing between the rows being 800×1600mm.

[0034] Basic parameters of reinforced anchor cable support

[0035] 1) Basic parameters of reinforcement anchor cables

[0036] Roof: A total of 4 reinforcing anchor cables are drilled and installed in each section, with specifications of Φ21.6 ×9300mm. Starting from the goaf side, the first reinforcing anchor cable is 500mm away from the goaf wall, the second reinforcing anchor cable is 900mm away from the first reinforcing anchor cable, the third reinforcing anchor cable is 1225mm away from the second reinforcing anchor cable, the fourth reinforcing anchor cable is 1500mm away from the third reinforcing anchor cable, and the fourth reinforcement is 630mm away from the actual coal wall, and the row spacing is 800mm.

[0037] Left side: Two rows of anchor cable beams are added on the left side, using Φ21.6×4300mm short reinforcement anchor cables with a spacing of 800×1600mm. The anchor cable beams are constructed more than 30m ahead of the mining face and simultaneously with the top plate reinforcement.

[0038] 2) Angle of drilling and installation of reinforcement anchor cable

[0039] Top plate: The reinforcing anchor cables at the right shoulder corner are drilled vertically, and the angle between the reinforcing anchor cables at the left shoulder corner of the top plate and the normal line of the top plate is 20°; the remaining reinforcing anchor cables of the top plate are drilled vertically.

[0040] The inclination angle of the upper reinforcement anchor cable of the left side is 0°, and the inclination angle of the lower reinforcement anchor cable of the left side is -12°.

[0041] 3) Anchoring agent for reinforcing anchor cables

[0042] Top plate: The reinforced anchor cables (21.6×9300mm) all use 2 rolls of MSK2550 + 2 rolls of MSZ2550. The 2 rolls of MSK2550 are quickly installed at the bottom of the hole, and the anchoring length is not less than 2000mm.

[0043] Left side: short reinforcement anchor cable (21.6×4300mm) uses 1 roll of MSK2550 + 2 rolls of MSZ2550, and 1 roll of fast MSK2550 is installed at the bottom of the hole, and the anchoring length is not less than 1500mm.

[0044] 4) Strengthen anchor cable preload

[0045] Top plate: 4 reinforcing anchor cables (21.6×9300mm) with a tension force of 200~220kN (tensioner is about 40~450MPa).

[0046] Left side: Short reinforcement anchor cable (21.6×4300mm) is 120~150kN. All reinforcement anchor cables need to be inspected for anchoring force, that is, the same reinforcement anchor cable is tensioned to about 260~280kN, and tensioned 3~5 times. The reinforcement anchor cable is qualified only if it is not pulled off or loosened.

[0047] 5) Reinforcement of anchor cable chain

[0048] Along the direction of the tunnel, W-shaped steel belts are used to connect the anchor cables into a whole.

[0049] Top plate: The top plate reinforcement anchor cable is constructed with a length of 2700mm steel belt chain, the eyelet specification is 35×80mm, the eye distance is 800mm, the length reserved at both ends is 100mm, the thickness is 3mm, and the width is 300mm. Figure 5 shown.

[0050] Left side: The left side reinforcement anchor cables use steel belts to connect the reinforcement anchor cables into a whole, and the specifications are the same as those of the top plate reinforcement anchor cables.

[0051] 6) Reinforcement of anchor cable tray

[0052] ① Top reinforcement anchor tray: 300×300×20mm (middle hole φ100mm).

[0053] ② Anchor cable tray for side reinforcement: 300×300×20mm (middle hole φ30mm).

[0054] (4) Requirements for installation of reinforced anchor cables

[0055] 1) The exposed length of the reinforcement anchor cable is 150mm~250mm from the nut;

[0056] 2) Reinforcement anchor cables are installed with resin coils. Four coils are used for each hole of the top reinforcement anchor cable, and three coils are used for each hole of the side reinforcement anchor cable. When installing the reinforcement anchor cable, use an anchor drill to push the reinforcement anchor cable to the bottom of the hole at a uniform speed while rotating and stirring until the nut cannot be stirred. Finally, use a pneumatic wrench to reinforce the nut;

[0057] 3) The spacing error between reinforced anchor cables shall not exceed ±0.1m.

[0058] The above description is only a specific implementation method of the present utility model, but the protection scope of the present utility model is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present utility model, which should be included in the protection scope of the present utility model. Therefore, the protection scope of the present utility model should be based on the protection scope of the claims.

Claims

1. An auxiliary air intake tunnel reinforcement support device, characterized in that: It includes reinforcing anchor cables, constant resistors and W-shaped steel belts. Six reinforcing anchor cables are used for each section, of which four are arranged at the top of a trapezoidal section of the tunnel, and two are arranged at the side of a trapezoidal section of the tunnel and located on the solid coal side. The end of the reinforcing anchor cable at the top of the tunnel is fixedly connected to one end of the constant resistor, and the other end of the constant resistor is fixedly connected to the W-shaped steel belt. The W-shaped steel belt is arranged at the top of the tunnel and forms a reinforced support with the constant resistor and the reinforcing anchor cables. It also includes the original anchor rods and the original anchor cables. The original anchor rod support spacing is 750×800mm; the original anchor cable support spacing is 1500×1600mm, and is arranged in a "three-zero-three" direction; among the four reinforcing anchor cables at the top of the tunnel, one close to the solid coal side has an angle of 15° with the roof normal And it is located at the left shoulder corner of the roof, and the other 3 are arranged vertically. The reinforcing anchor cable at the top of the tunnel is φ21.6×9300mm. Among the 2 reinforcing anchor cables on the side of the tunnel, one close to the bottom plate has an inclination angle of -12°, and the other is arranged horizontally. The reinforcing anchor cable at the side of the tunnel is φ21.6×4300mm; the 4 reinforcing anchor cables at the top of each trapezoidal section start from the goaf side, the first reinforcing anchor cable is 500mm away from the goaf wall, the second reinforcing anchor cable is 900mm away from the first reinforcing anchor cable, the third reinforcing anchor cable is 1225mm away from the second reinforcing anchor cable, the fourth reinforcing anchor cable is 1500mm away from the third reinforcing anchor cable, and the fourth reinforcing anchor cable is 630mm away from the real coal wall. The spacing between the 4 reinforcing anchor cables is 800mm.

2. The auxiliary air intake tunnel reinforcement support device according to claim 1, characterized in that: There are two rows of reinforcing anchor cables on the side of the tunnel, with a spacing of 800×1600mm between rows.

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