A method for gob-side entry retention with high-water material and thin-wall composite support

Abstract

The invention relates to a gob-side entry retaining method for a high-water-material thin wall composite support. The method comprises the following steps: (1) successively erecting U-shaped steel supporting columns along a break line before a roof of a gob area collapses; (2) laying inner metal meshes at outer sides of the U-shaped steel supporting columns, and fixing the inner metal meshes with the U-shaped steel supporting columns; (3) erecting temporary individual hydraulic props in an entry which is far away from outer ends of the inner metal meshes 13, laying outer metal meshes at inner sides of the temporary individual hydraulic props, and laying temporary wooden forms at the temporary individual hydraulic props at the front ends of the inner and outer metal meshes; (4) suspending filling bags between the inner and outer metal meshes and the temporary wooden forms; (5) mounting metallic draw bars which are used for connecting the U-shaped steel supporting columns and a high-water-material thin wall in a manner that the metallic draw bars need to pass through the filling bags with armholes, inner ends of the metallic draw bars penetrate through the inner metal meshes, the U-shaped steel supporting columns, pre-placed wooden padding block and inner iron padding plate and are integrated with inner nuts, and outer ends of the metallic draw bars penetrate through the outer metal meshes and outer iron padding plate and are integrated with nuts; (6) charging the filling bags with super high-water material slurry.

Description

technical field [0001] The invention relates to a gob-side entry retaining method in coal mines, in particular to a gob-side entry retaining method for coal mine high-water material thin-wall composite support. Background technique [0002] Gob-side entry retention technology is a relatively mature technology applied in coal mines, and there are many technical methods to realize entry entry retention. Gobside entry technology, first, can realize coal pillar-free mining and improve coal recovery rate; second, can reduce the amount of roadway excavation, solve the problem of mining replacement tension, and improve economic benefits; third, can eliminate the coal seam caused by the left coal pillar in the goaf Spontaneous combustion disasters provide guarantee for mine safety. [0003] At present, there is a gobside retaining technology that uses high-water materials to construct the roadside support body, which has the characteristics of fast condensation speed, high early st...

AI Technical Summary

Problems solved by technology

Therefore, the design strength of the filling body needs to be improved, which further increases the amount of materials and greatly increases the cost of entry retaining

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