Top breaking gob-side entry retaining method for tender roofs

A technology for retaining gobs and roofs, which is applied to support roof beams of mine roofs, earthwork drilling, shaft lining, etc., and can solve problems such as retaining gobs

Inactive Publication Date: 2015-09-23
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of gob-side entry retention under the condition of weak roof, the present invention provides a method of gob-side entry retention with a broken roof on t

Method used

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  • Top breaking gob-side entry retaining method for tender roofs
  • Top breaking gob-side entry retaining method for tender roofs
  • Top breaking gob-side entry retaining method for tender roofs

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Embodiment Construction

[0030] 4. Weak rock formations will expand when exposed to water, and their strength will drop sharply; measures must be taken to prevent water from softening.

[0031] The present invention will be further described below in conjunction with accompanying drawing.

[0032] The method of gob-side entry retention with weak roof and broken roof of the present invention comprises the following steps:

[0033] The first step is as figure 1 or figure 2 As shown, the weak roof 3 of the roadway supported by the original anchor net cable joint support or scaffold support needs to be strengthened with anchor cables. The cables are inclined 5° to 20° into the roadway, and the weak roof is anchored to the upper hard roof 4;

[0034] There are coal seams 15 on both sides of the roadway, and above the coal seams are weak roof 3 and hard roof 4 in sequence. When the rock condition is relatively complete, only the joint support of the anchor net and cable can be used; when the surroundin...

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PUM

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Abstract

The invention discloses a top breaking gob-side entry retaining method for tender roofs. The top breaking gob-side entry retaining method includes steps of firstly, reinforcing and supporting the tender roofs of roadways jointly supported by original anchor meshes and cables or supported by sheds; secondly, laying wire meshes on gob sides; thirdly, preliminarily breaking the roofs of the roadways on the gob sides; fourthly, piling up preliminarily broken caved gangue until the caved gangue reaches rock of upper-end hard roofs to form gangue piled walls; fifthly, burying perforated grouting pipes in the formed gangue walls, spraying concrete on the surfaces of the wire meshes and the surfaces of the gangue walls to form concrete sprayed supporting layers; sixthly, injecting concrete grout in each preliminarily buried grouting steel pipe by the aid of a grouting pump after the concrete sprayed supporting layers are solidified; seventhly, sequentially detaching falling preventing devices and dense reinforcing columns along with advancing of working faces; eighthly, reinforcing and supporting the roofs under special conditions. The top breaking gob-side entry retaining method has the advantages that active bearing supporting effects can be realized for inherent characteristics of the tender roofs, supporting forms are simple, the cost is low, and entry retaining effects can be efficiently realized.

Description

technical field [0001] The invention relates to a method for retaining a gob-side entry, in particular to a method for retaining a gob-side entry with a broken roof on a weak roof, and belongs to the technical field of roadway support. Background technique [0002] The key to the gob-side entry retention technology is whether the roadside support can adapt to the characteristics of the roof, and the small shrinkage can be used to limit the sinking of the roof at the junction of the roadway and the gob, so as to avoid serious deformation of the support in the roadway. Commonly used technical methods mainly include (1) masonry gangue belts, along with the advancement of the mining face, a gangue belt with a width of about 5m is built on the roadway; The operation in the empty area requires a large amount of labor, which belongs to passive support, and the support effect is poor. (2) Set up dense pillars or wooden piles. On the side of the roadway near the goaf, as the working...

Claims

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Application Information

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IPC IPC(8): E21D21/00E21D20/00E21D11/10E21D15/00E21D17/00
Inventor 马占国杨党委高陆蒋成瑞冯建川连永权四旭飞孙凯王志强杨玉树倪亮张金亮
Owner CHINA UNIV OF MINING & TECH
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