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Mining roadway coal pillar reinforcing method

A technology for mining roadways and coal pillars, applied in tunnels, ground mining, tunnel lining, etc., to achieve the effect of ensuring safe and efficient production, large width and wide application range

Inactive Publication Date: 2014-04-23
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for strengthening coal pillars in mining roadways, which can effectively solve the problems existing in the existing technology for strengthening coal pillars in roadways

Method used

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  • Mining roadway coal pillar reinforcing method
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  • Mining roadway coal pillar reinforcing method

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Embodiment Construction

[0013] The present invention provides a method for strengthening the inter-lane coal pillar of the mining roadway. Since the multi-lane layout is adopted in the mining face, the inter-alley coal pillar (2) is formed. Firstly, the conventional anchor belt net is used to support and reinforce the coal pillar (2). Then drill holes on the coal side and penetrate the coal pillar, penetrate the extension bolt (4), lay channel steel beams or steel strips (6) on both sides of the extension bolt (4), and the steel strip or groove The steel girder is pressed on the steel belt (5) that has been constructed, and the mesh (7) and the steel belt (5) are tightly connected into a whole to enhance the surface protection effect on the coal pillar. At the same time, high prestress is applied to both ends of the extended anchor rod (4), so that the coal pillar is in a three-dimensional stress state, and the deformation of the coal pillar can be effectively controlled in the early stage. Due to th...

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Abstract

The invention discloses a mining roadway coal pillar reinforcing method. The method comprises, firstly, reinforcing roadway coal pillars through common anchor belt net supports; secondly, drilling coal sidewalls and penetrating the coal pillars, inserting extension anchor rods (4) into the drilled holes and laying steel strips or steel channel beams (6) on both sides of every extension anchor rod (4), wherein the steel strips or steel channel beams are arranged on constructed steel strips (5) to connect meshes (7) and the steel strips (5) into a whole to enhance the surface protection effects on the coal pillars; meanwhile, exerting high prestress on both ends of every extension anchor rod to enable the extension anchor rod to be in a three-directional stress mode and accordingly effectively control the deformation of the coal pillars in earlier stages. The extension anchor rods can be extended randomly according to the size of a roadway without restriction of roadway space, thereby being large in width applicable to the coal pillars and wide in application range. Compared with opposite-pull anchor cables, the extension anchor rods have a higher elongation rate, are applicable to the deformation characteristics of the coal pillars and can ensure no collapse of the coal pillars when large deformation occurs due to mining operation and guarantee the production safety of a mining working face.

Description

technical field [0001] The invention belongs to the technical field of coal mine roadway support, and relates to a method for reinforcing coal pillars in mining roadways. Background technique [0002] There are many ways to arrange coal mining roadways in my country, including single-lane layout, double-lane layout and multi-lane layout. For working faces with small gas emission and relatively stable coal seam occurrence, the recovery roadway is generally arranged in a single roadway. In recent years, with the substantial increase in the output of coal mining face and the emergence of a large number of high-gas mines, in order to effectively solve the problems of transportation, ventilation and gas, the double-lane and multi-lane layout of the working face has become a main way of roadway layout. . Two or more roadways are arranged in close distance, and the stability of coal pillars between roadways is becoming more and more serious. The coal pillars in the roadway will ...

Claims

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Application Information

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IPC IPC(8): E21D11/14E21D21/00E21C41/16
Inventor 马振乾姜耀东王宏伟张文钊张科学杨英明李彦伟
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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