CN107165664A - A kind of slope thick seam tunnels superelevation stope drift active workings Qie Dingliu lanes method along top - Google Patents

Abstract

The invention relates to a method for excavating a super-high recovery roadway along the top of an inclined thick coal seam and cutting the top and retaining the roadway. It adopts the stage-by-stage joint excavation and control technology. Before the construction of the mining roadway in front of the working face, the top-cutting anchor cable and the top-cutting drilling will be carried out, and then the undercover section will be expanded and brushed, and the roadside support will be repaired. +Hinged roof beam+U-shaped steel shed+wooden stack" to strengthen support; during the mining face, remove the anchor for the high side, recover the triangular coal at the end, lay the mesh behind the frame, and connect the high side mesh to form a top-cut roof Lane and achieve multiplexing. The invention is simple and easy to implement, can effectively solve the problems of supporting structures such as anti-teardown, coal side slabs, etc., realizes roadway reuse and support material recovery, increases the recovery rate of triangular coal at the end, reduces production costs, and has good economic efficiency. and social benefits.

Description

A method of cutting the top and retaining the roadway in the super-high recovery roadway along the top of the inclined thick coal seam

technical field

The invention relates to coal mine mining and roadway excavation and support technology, in particular to a method for excavating a super-high mining roadway along the top of an inclined thick coal seam by cutting the top and retaining the roadway.

Background technique

Gobside entry retaining, as a layout method without coal pillars, has the advantages of improving the recovery rate of coal resources, reducing the rate of roadway excavation, and alleviating the tension of continuous excavation at the working face, etc., and is widely used in coal mine production. However, for gob-side entry retention in high gassy thick coal seams, in order to facilitate the mining of the working face, the mining roadway is often excavated along the bottom, which can easily cause problems such as gas accumulation in the upper corner and roof sinking, which has brought serious problems to mine safety. challenge. If the method of tunneling along the top is adopted, the problem of a large loss of triangular coal at the end of the working face will occur again, which increases the loss of coal resources.

Based on the above analysis, measures such as excavating the recovery roadway along the top, increasing the height of the roadway, and adjusting the angle of coal cutting at the end can effectively solve the above problems. Problems such as sidewalls and falling gangue entering the roadway provide a practical way to keep the goaf along the top of the super-high mining roadway.

Contents of the invention

In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a method for cutting the top and retaining the roadway of the ultra-high recovery roadway excavating along the top of the inclined thick coal seam. The joint excavation and control technology of section steel shed + wooden pile" effectively solved the problems of anti-teardown of support structure, coal gangue gangue, and falling gangue into the roadway, and realized the single hydraulic prop, hinged roof beam and U-shaped steel Recycling and utilization of support materials, etc., increases the recovery rate of the triangular coal at the end of the working face.

The technical scheme that the present invention solves is, comprises the following steps:

(1) During the mining roadway excavation of the working face, the roadway is excavated along the top, the roadway section (width × height) is 4700mm × 3500mm, the height of the section is the height of the centerline of the roadway, and the joint support of the anchor net cable is used;

(2) Before the mining of the working face, the top cutting drilling shall be carried out in the mining roadway in front of the working face, so that the roof of the roadway and the roof of the working face can be disconnected smoothly to ensure the integrity and stability of the roof of the roadway. The depth of the top cutting drilling is 15m, and the construction ends Finally, cut the anchor cable on the roof, strengthen the anchor cable support on the solid coal side of the roadway, and then expand the section undercover and fill up the anchor rod. The roadway after the section becomes a super-high roadway, which reduces the triangle coal at the end and effectively improves the recovery rate of the working face;

(3) Strengthen the anchor cable support for the newly excavated roadway solid coal side, and then hang the mesh on the top-cut anchor cable of the side roof of the roadway high side. roadway high top;

(4) Adopt "single hydraulic prop + hinged roof beam + U-shaped steel shed + wooden pile" to strengthen the support of the roadway;

(5) During the mining of the working face, remove the anchor of the high side and recover the triangular coal at the end. According to the performance of the shearer, increase the coal cutting angle of the end as much as possible to improve the recovery rate of the triangular coal at the end. After the completion, move the frame and lay metal mesh behind the support, connect the mesh with the high-top mesh to prevent the falling gangue from entering the roadway, form the roof cut and retain the roadway and realize reuse.

The invention is simple and easy to implement, can effectively solve the problems related to roadway support such as anti-teardown of the support structure, realize roof cutting and retain roadway and reuse, and can recycle supporting materials such as single hydraulic props, hinged roof beams and U-shaped steel, Increase the recovery rate of the triangular coal at the end of the working face, reduce the cost to the greatest extent, and achieve good economic and social benefits.

Description of drawings

Fig. 1 is the schematic diagram when the mining roadway excavation of the present invention is completed;

Fig. 2 is the schematic diagram after the mining roadway of the present invention adopts the undercover expansion brush section in advance;

Fig. 3 is a schematic diagram of cutting the roof and retaining the roadway after mining in the working face of the present invention.

detailed description

The specific implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and specific conditions.

Shown in Fig. 1-3, the present invention is realized by the following steps in concrete implementation:

(1) During the mining roadway excavation of the working face, the roadway is excavated along the roof 1, the bottom of the roadway is horizontal, the two sides are vertical, the top is inclined along the inclination angle of the rock formation, and the false roof is removed. The height at the centerline of the roadway is supported by anchor net cable joint support 4;

(2) Before the mining of the working face, in the mining roadway in front of the working face, the top edge of the roadway high side 2 side is top-cut and drilled 6, so that the roof of the roadway and the roof of the working face can be disconnected smoothly, ensuring the integrity and stability of the roof of the roadway , the depth of the top cutting drill hole 6 is 15m. After the construction is completed, two top cutting anchor cables 14 are added on the side of the roof 1 close to the high side of the roadway 2, and a reinforcement is installed on the side of the roadway solid coal body side 2 at an appropriate position. Anchor cable 5. The repaired anchor cables must be anchored on the old roof, and then the undercover section will be expanded and the anchor rods will be repaired. Form a super-high roadway, reduce the triangular coal at the end, and effectively improve the recovery rate of the working face. According to the actual situation on site, the distance of advanced construction can be selected between 10m-40m;

(3) Carry out anchor cable reinforcement support for the newly excavated solid coal body side 3 of the roadway. At an appropriate position at the lower part of the roadway solid coal body side 3, a reinforced anchor cable 5 is installed obliquely downward, and then a reinforced anchor cable 5 is installed on the roadway high side 2 Hang the metal mesh 11 on the top-cut anchor cable 14 at the top of the side, and the height of the initial hanging mesh is flush with the high side 2 of the roadway, so that the metal mesh 11 covers the high side 2 of the roadway;

(4) Strengthen the support of the roadway with "single hydraulic prop 7 + hinged top beam 9 + U-shaped steel shed 8 + wooden pile 12". Set up a single hydraulic prop 7 at an appropriate distance, erect a U-shaped steel roof beam on the top of the single hydraulic prop 7, and erect U-shaped steel shed legs on the side of the roadway high side 2, and connect the U-shaped steel roof beam with a card cable 10 to form a whole , forming a U-shaped steel shed 8 to control the horizontal thrust generated by the falling gangue 13. The height of the U-shaped steel shed 8 is 4500mm, and the metal mesh 11 hung on the side of the roadway high side 2 is placed outside the U-shaped steel shed 8. From the pillar 7 to the distance of 1000mm from the solid coal body of the roadway, add a hinged roof beam 9 to the single hydraulic pillar 7 to increase the supporting area of the single hydraulic pillar 7, forming a single hydraulic pillar 7 + hinged roof beam 9 + U The supporting structure of 8-shaped steel shed, and the position above the U-shaped steel shed 8 that is not connected to the roof is backed by wooden piles 12 to reduce the deformation space of the roof, and finally form a "single hydraulic prop 7 + hinged roof beam 9 + U-shaped steel shed 8 + wooden piles 12 "Strengthen support;

(5) During the mining of the working face, withdraw the anchor of the roadway high side 2 and recover the triangular coal at the end. According to the performance of the shearer, the coal cutting angle at the end should be increased as much as possible to improve the recovery of the triangular coal at the end After the coal cutting is completed, the frame is moved and the metal mesh 11 is laid behind the support, and the mesh is connected with the high-top mesh to prevent the falling gangue 13 from entering the roadway, forming a top-cut roadway and realizing reuse.

The invention is simple and easy to implement, can effectively solve the problems related to roadway support such as anti-teardown of the support structure, realize roof cutting and retain roadway and reuse, and can recycle supporting materials such as single hydraulic props, hinged roof beams and U-shaped steel, Increase the recovery rate of the triangular coal at the end of the working face, reduce the cost to the greatest extent, and achieve good economic and social benefits.

Claims (2)

1. a kind of slope thick seam tunnels superelevation stope drift active workings Qie Dingliu lanes method along top, it is characterised in that comprise the following steps：

1）During working face extraction tunnelling, tunnel is tunneled along top, drift section（It is wide × high）For 4700mm × 3500mm, break Face is highly height at center line in roadway, using combined support with bolt-net-cable；

2）Before working face extraction, top drilling is cut to stope drift active workings construction in front of working face, it is 15m, construction knot to cut top drilling depth Shu Hou, top anchor cable is cut to top board construction, carries out Anchor reinforced support to the real coal body side in tunnel, then planted agent expands brush section and polishing Drift section after anchor pole, expansion（It is wide × high）For 4700mm × 5500mm；

3）Anchor reinforced support is carried out to the real coal body side in garden-fresh tunnel, then cutting on the anchor cable of top in tunnel high side side top plate Linked network, the height of first linked network is concordant with tunnel high side, mesh sheet is covered tunnel high side；

4）" hydraulic prop+articulated roof beam+U-shaped steel canopy+grillage " strengthening supporting is taken tunnel；

5）During working face extraction, anchor is moved back to high side, the Triangle Coal of termination is reclaimed, according to coal-winning machine performance, increases as much as possible The coal cutting angle of termination, after the completion of coal cutting, moves frame and in the lapping of support rear, mesh sheet is connected with high side mesh sheet, top is cut in formation Stay lane and realize multiplexing.

2. a kind of slope thick seam according to claim 1 is along top driving superelevation stope drift active workings Qie Dingliu lanes method, it is special Levy and be, specifically realized by following steps：

1）During working face extraction tunnelling, tunnel is along top plate（1）Driving, tunnel bottom level, two help vertical, and top is along rock Inclination layer is tilted, and removes false roof, drift section（It is wide × high）For 4700mm × 3500mm, profile height is high at center line in roadway Degree, using combined support with bolt-net-cable（4）；

2）Before working face extraction, to stope drift active workings in front of working face, in tunnel high side（2）Top drilling is cut in side roof part edge, construction （6）, cut top drilling（6）Depth is 15m, after construction terminates, in top plate（1）Close to tunnel high side（2）Side complement two cuts top anchor Rope（14）, in the real coal body side in tunnel（2）Appropriate location, tilts upward piece reinforcement anchor cable of complement（5）, each anchor cable palpus of complement Ensure to be anchored on old top, then planted agent expands brush section and polishing anchor pole, drift section after expansion（It is wide × high）For 4700mm × 5500mm, according to live reality, the distance constructed in advance may be selected between 10m-40m；

3）To the real coal body side in garden-fresh tunnel（3）Anchor reinforced support is carried out, in the real coal body side in tunnel（3）The appropriate position in bottom Put, diagonally downward piece reinforcement anchor cable of complement（5）, then in tunnel high side（2）Side roof part cuts top anchor cable（14）Upper close plating Net（11）, height and the tunnel high side of first linked network（2）Concordantly, wire netting is made（11）Cover tunnel high side（2）；

4）" hydraulic prop is carried out to tunnel（7）+ articulated roof beam（9）+ U-shaped steel canopy（8）+ grillage（12）" strengthening supporting, side Method is, away from the real coal body side in tunnel（3）Hydraulic prop is set at 500mm（7）, it is spaced suitable distance and one monomer is set again Hydraulic prop（7）, in hydraulic prop（7）Top sets up U-shaped steel cap, in tunnel high side（2）Side sets up U-shaped steel canopy leg, And with U-shaped steel cap card cable（10）Link into an integrated entity, form U-shaped steel canopy（8）, U-shaped steel canopy（8）Highly it is 4500mm, tunnel High side（2）The wire netting of pendant（11）It is placed in U-shaped steel canopy（8）Outside, the hydraulic prop set up after movement（7）To away from tunnel reality Coal body is helped（3）At 1000mm, and in hydraulic prop（7）Upper increase articulated roof beam（9）, form hydraulic prop（7）+ hinge Connect back timber（9）+ U-shaped steel canopy（8）Supporting construction, U-shaped steel canopy（8）Top does not connect top position and uses grillage（12）The back of the body is real, most end form Into " hydraulic prop（7）+ articulated roof beam（9）+ U-shaped steel canopy（8）+ grillage（12）" strengthening supporting；

5）During working face extraction, to tunnel high side（2）Anchor is moved back, the Triangle Coal of termination is reclaimed, according to the performance of coal-winning machine, to use up Possibly increase the coal cutting angle of termination, after the completion of coal cutting, move frame and lay wire netting at support rear（11）, by mesh sheet and height Mesh sheet connection is helped, Qie Dingliu lanes is formed and realizes multiplexing.