Recycling and supporting method for fully mechanized coal mining face

Abstract

The invention discloses a fully mechanized coal mining face recycling and supporting method which comprises the following steps: step 1, laying a double-layer iron gauze, and hanging a steel wire rope; secondly, square timbers are installed; thirdly, anchor cable locks are driven, and steel wire ropes are stabilized through I-shaped steel; 4, front beams of the hydraulic support all extend out, then the front beams are retracted one by one from a tail frame, a row of anchor cables are arranged at the front ends of the front beams along the mining face, and a T-shaped steel belt is used for supporting; fifthly, the hydraulic support is disassembled; sixthly, anchor rods are matched with iron back plates to conduct interlocking reinforcement between the two rows of I-shaped steel 1 which are laid in an inclined mode; and step 7, after stopping mining, hanging wire meshes on all the coal walls of the mining face, and arranging three rows of side anchor rods. According to the method, the safety is guaranteed through practical application to the 150314 mining face of a certain mine, the recovery efficiency is greatly improved, the mode that two hydraulic supports are recovered per shift originally is changed into the mode that four hydraulic supports can be recovered per shift, labor force and cost are saved, and the working face working environment is greatly improved.

Description

Technical Field

[0001] The invention relates to a fully mechanized mining working face recovery support method, belonging to the technical field of coal mine support. Background Art

[0002] A certain mine is a close-range coal seam mining, with the roof mainly composed of muddy siltstone and poor roof surrounding rock stability. Since it often takes a long time to prepare the recovery line after the mining is completed, the mining face cannot be recovered in time after the mining is completed. The mining face is stopped for too long, and the roof is affected, which can easily cause the roof to be unstable.

[0003] Using traditional support methods, such as Figure 1-Figure 5 As shown, when the working face is withdrawn, the empty roof section is supported by I-beam 1, and the support strength is insufficient. When the hydraulic support is unloaded, it is easy to cause a roof fall accident. At the same time, during the recovery of the working face, since the roof is in a completely unsupported state after the hydraulic support is recovered, a 20-inch air duct must be laid from bottom to top near the coal wall to ensure normal air supply to the recovery working face. The traditional recovery method adopts the full collapse method for roof management. Each time a hydraulic support is recovered, the roof must be manually released, and the laid false roof is manually destroyed to prevent the roof from collapsing in time, resulting in a large area of ​​suspended roof. The sudden collapse of the roof causes a large area of ​​gas to gush out from the recovery empty roof area, causing gas to exceed the limit.

[0004] There are great risks in safety management, especially when I-beam 1 is used to support the exposed roof in advance. The support strength is not enough, which is easy to cause roof collapse accidents. At the same time, the distance from the front exploration beam of the hydraulic support to the coal wall side is only 0.8m, and the recovery space does not meet the safety requirements. The hydraulic support has insufficient space when adjusting the direction, which is easy to cause collision. The roof does not collapse, and there are great safety hazards when the roof is forced to fall manually, and the roof collapse is easy to injure people.

[0005] The labor intensity of employees is high. When using the traditional recycling method, a 20-inch air duct must be laid on the recycling work surface, and wooden top columns (single columns) and wood piles must be constructed on the gas pipe side to protect the air duct, resulting in a lot of physical labor for workers on the recycling work surface.

[0006] A large number of personnel are required, and at least 6 people must be present on the work surface to carry out recycling. At the same time, due to the use of a 20-inch air duct for air supply, the air volume is only 120-150m³ / min, resulting in a poor working environment. Personnel work under high temperature for a long time, which is prone to fatigue. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a fully mechanized mining face recovery and support method to solve the technical problems existing in the above-mentioned prior art.

[0008] The technical solution adopted by the present invention is: a fully mechanized mining face recovery support method, comprising the following steps: Step 1: When the working face is advanced to the position of 11-13m from the coal wall to the stop mining line, the first row of double-layer wire mesh is laid, and the first steel wire rope is hung. The steel wire rope is arranged along the inclined direction of the mining face and parallel to the coal wall of the mining face. The second steel wire rope is hung at a distance of 280-320mm from the first steel wire rope, and the third steel wire rope is hung at a distance of 280-320mm from the second steel wire rope; the double-layer wire mesh is laid from the lower side of the 1# frame of the head to the upper side of the tail frame of the tail; Step 2: Install the square wood on the first row of wire mesh and tie the square wood to the wire mesh with wire; Step 3: Install anchor locks at the upper and lower ends of the first three steel wires, use I-beam 1 to stabilize the steel wires, and then lay a row of wire mesh every two coal cuts, with a steel wire rope hung every 400-450mm; Step 4: When the working face is 2-3m away from the stop mining line, do not pull the hydraulic support when cutting coal. First, fully extend the front beam of the hydraulic support, and then retract the front beams one by one from the tail frame. Set a row of anchor cables along the mining face at the front end of the front beam. The size of the anchor cable is Φ21.6mm×6.3m, and the anchor cable spacing is 1.8-2m. Use T-shaped steel belts for support. After the steel belt support is completed, fully extend the front beam; Step 5: Continue to cut coal forward to dismantle the hydraulic support. When dismantling the hydraulic support, install 2 I-beams 1 on each hydraulic support until all I-beams 1 are installed. Then, lay 2 rows of I-beams 1 along the mining face inclination under the installed I-beams 1. Use anchor cables to fix them every 1.8-2m. The size of the anchor cables is Φ21.6mm×6.3m. Interlock and reinforce all I-beams 1 installed on the front beam. Step 6: After the reinforcement is completed, anchor rods and iron back plates are used to interlock and reinforce the two rows of I-beams 1 laid in the middle of the two rows of I-beams 1 laid in the inclined manner; Step 7: After stopping mining, all coal walls of the mining face are covered with wire mesh and three rows of anchor rods are installed. The anchor rods are arranged at the overlap of the wire mesh.

[0009] Preferably, in step seven, the anchor rods are arranged in three-point holes with a spacing of 800-900mm×1000-1100mm.

[0010] Preferably, before step one, when the coal wall of the working face is 20-22m away from the stop mining line, the mining face is adjusted to be parallel to the stop mining line, and the mining face height is greater than or equal to 2.5m to ensure that the mining face roof is intact and facilitate the support of the roof.

[0011] Preferably, the mining height is controlled above 3.0m when the working face stops cutting the last piece of coal, so that the mining face and transportation tunnel equipment can be recovered.

[0012] Preferably, double-strand 14# iron wire is used to bundle the steel wire rope and the wire mesh together under the double-layer wire mesh, and the bundling spacing is not more than 200mm; the specifications of each wire mesh are length × width 6.0-6.5m × 1.5-2.0m, the overlap length of the wire mesh is 100-120mm, and the overlap is tightened with double-strand 14# iron wire, and the spacing between the two tying wires is 200-230mm.

[0013] Preferably, the recovery order of the hydraulic supports is to recover each support frame from bottom to top.

[0014] Preferably, after the working face stops mining, wood piles must be added to the upper and lower tail tunnels for reinforced support, and the lower end is reinforced with the original support form. After the support is recovered, a wood pile is erected in its place to support the top plate, replacing the original hinged top beam and single column for recovery; the upper end is supported by a group of 6-7m long I-beams and 2-3m anchor rods, and the top of the I-beam is tightly connected with a semi-circular log or a brake rod.

[0015] Preferably, when the support starts to be recovered upwards, a single column and a 3-4m long π-shaped steel beam are used to cooperate with each other to support the top plate at the position of the recovered support, and a "one beam and four columns" support form is set along the direction. The spacing of the I-beam 1 is 750mm, and the spacing of the single column is 800mm; when the recovery starts, the positions of two supports are supported first, and then for each support recovered upwards, two π-shaped steel beams are recovered in sequence from bottom to top to support the position of the recovered support.

[0016] Preferably, when the support begins to be recovered upwards, a 2-3m long I-beam + anchor cable is used on the front exploration beam of the recovered support to support the roof. When the support is recovered and lowered, a single column is added to each I-beam. The distance between the single column and the coal seam column is 700-900mm. The two supports that are recovered at the beginning are replaced first.

[0017] Preferably, after each hydraulic support is recovered, a wood pile is set up at each location where the hydraulic support has been recovered. The wood pile is set up in a herringbone shape, and a wooden top column is set up every 700-900 mm near the old pond. Beneficial effects of the invention: Compared with the prior art, the invention has been actually applied in the 150314 mining face of a certain mine, and safety has been guaranteed. The efficiency of recovery has been greatly improved, from recovering 2 hydraulic supports per shift to recovering 4 hydraulic supports, which saves labor and costs, and the working environment of the working face has also been greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a traditional mining face support plan.

[0019] Figure 2 yes Figure 1 Middle AA section view.

[0020] Figure 3 yes Figure 1 Middle BB section view.

[0021] Figure 4 It is a side section diagram of local support of the coal wall in the traditional mining face.

[0022] Figure 5 This is the local support diagram of the other coal wall side section of the traditional mining face.

[0023] Figure 6 It is the mining face support plan view in the present invention.

[0024] Figure 7 It is a partial cross-section diagram of the mining face support in the present invention.

[0025] Figure 8 It is another partial cross-section diagram of the mining face support in the present invention.

[0026] Fig. 9 It is another partial cross-section diagram of the mining face support in the present invention.

[0027] Fig.10 It is another partial cross-section diagram of the mining face support in the present invention.

[0028] The reference numerals in the drawings of the specification include: I-beam 1, bracket 2, single column 3, air duct 4, wire mesh 5, wood pile 6, anchor rod 7, steel wire rope 8, anchor cable 9, iron back plate 10, and steel belt 11. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0030] Embodiment 1: A fully mechanized mining face recovery support method, such as Figure 6-Figure 10 As shown, the following steps are included: Step 1: When the working face is advanced to the position where the coal wall is 12m away from the stop mining line, start laying the first row of double-layer wire mesh 5 (the double-layer wire mesh 5 is laid from the lower side of the 1# frame to the upper side of the 106# frame at the tail of the machine), hang the first steel wire rope 8, and the steel wire rope 8 is arranged along the inclination direction of the mining face (and parallel to the coal wall of the mining face). The second steel wire rope 8 is hung at a distance of 300mm from the first steel wire rope 8, and the third steel wire rope 8 is hung at a distance of 300mm from the second steel wire rope 8.

[0031] Step 2: Install square wood (round wood is divided into four) on the first row of wire mesh 5, and tie the square wood to the wire mesh 5 with wire.

[0032] Step 3: Anchor rope locks are installed at the upper and lower ends of the first three steel wire ropes 8, and the steel wire ropes 8 are stabilized with I-beams 1. Then, a row of wire meshes 5 is laid forward every two coal cuts, and a steel wire rope 8 is hung every 400 mm.

[0033] Step 4: When the working face is 2m away from the stop mining line, cut a piece of coal first to extend the front exploration beam. The frame cannot be pulled and moved. After the coal cutting is completed, the front beam is retracted from the tail frame in sequence, and a row of anchor cables 9 (Φ21.6mm×6.3m) are installed at the front end of the front beam along the mining face. The spacing between the anchor cables 9 is 1.8m. Use T-shaped steel belts 11 for support. The steel belts 11 support the extension of the front exploration beam.

[0034] Step 5: Continue to cut coal forward to dismantle the hydraulic support 2. When dismantling the hydraulic support 2, install two 4m long I-beams 1 on each hydraulic support 2 until all the I-beams 1 are installed, and then lay two rows of I-beams 1 along the inclination of the mining face under the installed I-beams 1. The length of the I-beam 1 is 3.6m, and it is fixed with anchor cables 9 every 1.8m. The size of the anchor cables 9 is Φ21.6mm×6.3m. All the I-beams 1 installed on the front beam are interlocked and reinforced.

[0035] Step 6: After the reinforcement is completed, a row of φ22mm×2.5m anchor rods 7 are driven in the middle of the two rows of I-beams 1 laid at a distance of 300mm from the coal wall, and a 5mm thick 800 iron back plate 10 is used for support. The spacing between the anchor rods 7 is 1.5m, and the two rows of I-beams 1 laid at a tilt are interlocked and reinforced.

[0036] Step 7: After stopping mining, all coal walls of the mining face are covered with wire mesh 5 and three rows of side anchor rods 7 are installed (arranged according to three-eye arrangement, with a row spacing of 800mm×1000mm, and additional coal side columns are used for support in unstable areas of the surrounding rock of the coal wall). The anchor rods 7 are arranged at the overlap of the wire mesh 5.

[0037] In this embodiment, when the coal wall of the working face is 20m away from the stop mining line, the mining face must be adjusted to be parallel to the stop mining line, and the mining face height is guaranteed to be 2.5m to ensure that the mining face roof is intact and convenient for supporting the roof.

[0038] In this embodiment, when the working face stops mining and the last coal is cut, the mining height must be controlled above 3.0m to facilitate the recovery of the mining face and transport tunnel equipment.

[0039] In this embodiment, the double-layer wire mesh 5 and the steel wire rope 8 are laid along the inclined direction of the mining face (parallel to the coal wall of the mining face), and the steel wire rope 8 and the wire mesh 5 are bundled together with double-strand 14# iron wire under the double-layer wire mesh 5, and the bundling spacing is not greater than 200mm; the specifications of each wire mesh 5 are length × width = 6.0m × 1.76m, the overlap length of the wire mesh 5 is 100mm, and the overlap is tightened with double-strand 14# iron wire, and the spacing between the two tying wires is 200mm.

[0040] The recovery order of the hydraulic support 2 is to recover each support frame from bottom to top.

[0041] Other requirements for recycling hydraulic support 2: 1. After the working face stops mining, wood piles 6 must be added to the upper and lower tail tunnels for reinforced support. The lower end is reinforced with the original support form. After the support 2 is recovered, a wood pile 6 is erected in its place to support the roof, replacing the original hinged top beam and single column 3 for recovery; the upper end directly replaces the original support form of the hinged top beam and single column 3, and uses a group of 6m long I-beams and 2.5m anchor rods 7 (the spacing between anchor rods 7 is 800mm×800mm, and each anchor rod 7 uses 1 section of MSK2380 resin anchor agent) to support the upper end, and the top of the I-beam 1 is tightly connected with a semi-circular log or a brake rod.

[0042] 2. When starting to recover the support 2 upwards, use a single column 3 and a 3.3m long π-shaped steel beam to cooperate with each other to support the top plate at the position of the recovered support 2, and set up a "one beam and four columns" support form along the direction. The spacing of the I-beam 1 is 750mm, and the spacing of the single column 3 is 800mm; when starting to recover, first support the positions of two supports 2, and then for each support 2 recovered upwards, recover two π-shaped steel beams from bottom to top in turn to support the position of the recovered support 2.

[0043] 3. When starting to recover the support 2 upwards, use a 2.8m long I-beam 1 + anchor cable 9 on the front exploration beam of the recovered support 2 to support the roof. When the support 2 is recovered and lowered, an additional single column 3 is driven on each I-beam 1. The distance between the single column 3 and the coal seam column is 800mm. Replace the two supports 2 that are being recovered first. If the additional single column 3 affects the lowering and adjustment of the support 2, the column must be changed in advance.

[0044] 4. After each hydraulic support 2 is recovered, a wood pile 6 is set up at the location of each recovered support 2. The wood pile 6 is set up in a herringbone shape, and a wooden top column is set up every 800 mm at the position close to the old pond.

[0045] The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention 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 invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A fully mechanized mining face recovery and support method, characterized in that: The following steps are involved: Step 1: When the working face is advanced to the position of 11-13m from the coal wall to the stop mining line, the first row of double-layer wire mesh is laid, and the first steel wire rope is hung. The steel wire rope is arranged along the inclined direction of the mining face and parallel to the coal wall of the mining face. The second steel wire rope is hung at a distance of 280-320mm from the first steel wire rope, and the third steel wire rope is hung at a distance of 280-320mm from the second steel wire rope; the double-layer wire mesh is laid from the lower side of the 1# frame of the head to the upper side of the tail frame of the tail; Step 2: Install the square wood on the first row of wire mesh and tie the square wood to the wire mesh with wire; Step 3: Install anchor locks at the upper and lower ends of the first three steel wires, use I-beam 1 to stabilize the steel wires, and then lay a row of wire mesh every two coal cuts, with a steel wire rope hung every 400-450mm; Step 4: When the working face is 2-3m away from the stop mining line, do not pull the hydraulic support when cutting coal. First, fully extend the front beam of the hydraulic support, and then retract the front beams one by one from the tail frame. Set a row of anchor cables along the mining face at the front end of the front beam. The size of the anchor cable is Φ21.6mm×6.3m, and the anchor cable spacing is 1.8-2m. Use T-shaped steel belts for support. After the steel belt support is completed, fully extend the front beam; Step 5: Continue to cut coal forward to dismantle the hydraulic support. When dismantling the hydraulic support, install 2 I-beams 1 on each hydraulic support until all I-beams 1 are installed. Then, lay 2 rows of I-beams 1 along the mining face inclination under the installed I-beams 1. Use anchor cables to fix them every 1.8-2m. The size of the anchor cables is Φ21.6mm×6.3m. Interlock and reinforce all I-beams 1 installed on the front beam. Step 6: After the reinforcement is completed, anchor rods and iron back plates are used to interlock and reinforce the two rows of I-beams 1 laid in the middle of the two rows of I-beams 1 laid in the inclined manner; Step 7: After stopping mining, all coal walls of the mining face are covered with wire mesh and three rows of anchor rods are installed. The anchor rods are arranged at the overlap of the wire mesh.

2. A fully mechanized mining face recovery and support method according to claim 1, characterized in that: In step seven, the anchor rods are arranged in three-point holes with a spacing of 800-900mm×1000-1100mm.

3. A fully mechanized mining face recovery and support method according to claim 1, characterized in that: Before step one, when the coal wall of the working face is 20-22m away from the stop mining line, the mining face is adjusted to be parallel to the stop mining line, and the mining face height is greater than or equal to 2.5m to ensure that the mining face roof is intact and convenient for supporting the roof.

4. A fully mechanized mining face recovery and support method according to claim 1, characterized in that: When the working face stops mining and cuts the last piece of coal, the mining height is controlled above 3.0m to facilitate the recovery of the mining face and transportation tunnel equipment.

5. A fully mechanized mining face recovery and support method according to claim 1, characterized in that: Double-strand 14# iron wire is used to bind the steel wire rope and the wire mesh together under the double-layer wire mesh, and the binding spacing is no more than 200mm; the specifications of each wire mesh are length × width 6.0-6.5m × 1.5-2.0m, the overlap length of the wire mesh is 100-120mm, and the overlap is tightened with double-strand 14# iron wire, and the spacing between the two tying wires is 200-230mm.

6. A fully mechanized mining face recovery and support method according to claim 1, characterized in that: The recovery order of hydraulic supports is to recover each support frame from bottom to top.

7. A fully mechanized mining face recovery and support method according to claim 6, characterized in that: After the working face stops mining, wood piles must be added to the upper and lower tail tunnels for reinforced support. The lower end is reinforced with the original support form. After the support is recovered, a wood pile is erected in its place to support the top plate, replacing the original hinged top beam and single column for recovery. The upper end is supported by a group of 6-7m long I-beams and 2-3m anchor rods. The top of the I-beam is tightly connected to the top with a semi-circular log or a brake rod.

8. A fully mechanized mining face recovery and support method according to claim 6, characterized in that: When starting to recycle the supports upwards, single columns and 3-4m long π-shaped steel beams are used to cooperate with each other to support the top plate at the position of the recovered supports. The support is set in a "one beam and four columns" form along the direction. The spacing of I-beam 1 is 750mm, and the spacing of single columns is 800mm. When starting to recycle, first support the positions of two supports, and then for each support recycled upwards, two π-shaped steel beams are recycled from bottom to top in turn to support the positions of the recovered supports.

9. A fully mechanized mining face recovery and support method according to claim 6, characterized in that: When starting to recover the support upwards, use a 2-3m long I-beam + anchor cable on the front exploration beam of the recovered support to support the roof. When the support is recovered and lowered, add another single column on each I-beam. The distance between the single column and the coal seam column is 700-900mm. Replace the two supports that are being recovered first.

10. A fully mechanized mining face recovery and support method according to claim 6, characterized in that: After each hydraulic support is recovered, a wood pile is set up at the location of each recovered hydraulic support. The wood pile is set up in a herringbone shape. At the side of the old pond, a wooden top column is set up every 700-900mm.

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