Top breaking gob-side entry retaining method for tender roofs

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...

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 the weak roof, which uses active load-bearing support for the inherent characteristics of the weak roof. The support form is simple, the cost is low, and the efficiency is high. stay in lane

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