A method of forced lowering of the hard roof in the center of the working face

A hard roof and working face technology, applied in ground mining, earth drilling, mining equipment, etc., can solve problems such as high pressure on the central roof, achieve the effects of reducing stress, maintaining integrity, and enhancing blasting effects

Active Publication Date: 2021-03-16
山东省邱集煤矿有限公司
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Problems solved by technology

[0006] Aiming at the deficiencies of the prior art, the present invention provides a method for forcedly lowering the central hard roof of the working face, which solves the problem of high pressure on the central roof of the working face

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  • A method of forced lowering of the hard roof in the center of the working face
  • A method of forced lowering of the hard roof in the center of the working face
  • A method of forced lowering of the hard roof in the center of the working face

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Embodiment Construction

[0037] In order to clearly illustrate the technical features of the solution, the solution will be described below through specific implementation modes.

[0038] Refer to attached Figure 1-6, the present invention is achieved through the following technical solutions, a method for forced caving of a hard roof in the center of a working face, comprising the following steps:

[0039] a, when mining to the center of the working face, the side guard plate 51 of the fully mechanized mining support 5 protrudes toward the front end of the coal seam mining, and pushes to the top plate 1, and constructs several glass fiber reinforced plastic anchor rods 31 inserted into the coal seam 2 from the front end of the coal seam mining along the mining direction, And use resin anchoring agent for anchoring. There are two glass fiber reinforced plastic anchor rods 31 in the height direction, which are arranged vertically, in the height direction and in the mining direction, and the distance i...

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Abstract

The invention relates to a working face central hard roof forcible roof caving method. According to the method, a coal seam is supported, then roof cutting holes are drilled in a roof in the center ofa working face, blasting is carried out to form joint cutting surfaces, the roof is cut into a triangular area, and the roof is automatically caved after mining. According to the method, roof cavingis conducted in the center of the fully mechanized coal mining face, construction of a connection roadway in front of the working face is avoided, the excavation workload is greatly reduced, blastingis conducted on an area with large pressure, the blasting workload is saved, single hydraulic props and hinged girders are used for supporting, the displacement boundary of the roof can be limited during blasting, the surface integrity of the roof is kept, the in-hole blasting effect is enhanced, two rows of joint cutting surfaces and the triangular crushing area are formed in the hard roof, and according to the structural stress analysis, roof caving in the area is facilitated, so that a roof stress transmission path is cut off, the stress strength of a fully mechanized coal mining support isrelieved, and the problem that the pressure of the roof in the center of the working face is large is solved.

Description

technical field [0001] The invention relates to the field of coal mines, in particular to the technical field of roof caving methods in coal mines, in particular to a method for forced caving of a hard roof in the center of a working face. Background technique [0002] In recent years, with the depletion of shallow coal resources, more and more coal mines have entered the mining of lower group coal. When the limestone roof is hard and the integrity is good, the roof is not easy to collapse, and there are many safety risks. With the push mining of the working face, the uncollapsed roof behind the fully mechanized mining support forms a long cantilever structure, and the roof pressure in the goaf is transmitted to the side wall of the coal seam through the roof cantilever beam structure, resulting in excessive pressure on the fully mechanized mining support. Due to the low bearing capacity of the coal seam, the coal seam is often accompanied by slabs, and the side wall of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/18E21D19/00F42D3/04
CPCE21C41/18E21D19/00F42D3/04
Inventor 武善元赵仁乐云明李廷春朱庆文王凯李志臣贺敬平
Owner 山东省邱集煤矿有限公司
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