Grouting water plugging method for anchor cable hole of weakly-cemented water-rich roof

Abstract

A grouting water plugging method for an anchor cable hole of a weakly-cemented water-rich roof aims to solve the problem of water spraying support of the anchor cable hole of the weakly-cemented water-rich roof and prevent an anchor cable from rusting. The grouting water plugging method comprises the steps that a probe of a sight instrument is inserted into a drilled hole, and the length and diameter of a required solid cable body are determined comprehensively; after a roadway is excavated, concrete is sprayed immediately to close the roadway, and after an anchor rod is drilled and a net is hung, secondary concrete spraying is conducted; an anchor cable is drilled in the roadway roof in the direction perpendicular to the surface of the roadway roof through an anchor cable drilling machine; the solid cable body is mounted into the drilled anchor cable hole and fully anchored with hard surrounding rock through an anchoring cartridge; a rigid circular pipe, a slurry-expansion-type stop-grouting plug, a grouting tray and a lock are mounted sequentially, and a hole opening is sealed well; a tensioning machine is mounted at the exposed section of the solid cable body for tensioning pretightening; and the anchor cable hole grouting section located between an anchoring section and the stop-grouting plug is grouted, water of an aquifer of the roof is prevented from permeating to roof coal and rock through the anchor cable hole, and thus the waterproof and water-plugging effects are achieved.

Description

technical field [0001] The invention relates to the technical field of surrounding rock support for underground roadways in coal mines, in particular to a method for grouting and water blocking of anchor cable holes of weakly cemented and water-rich roofs. Background technique [0002] The stability of the surrounding rock of the roadway is the result of the joint action of the surrounding rock and the supporting body. The surrounding rock itself is an important part of the supporting structure or the supporting structure. The support of coal mine roadway has experienced a long process of wood shed support, masonry support, section steel support to bolt (cable) support. With the maturity of small-aperture anchor cable support technology and supporting technologies, resin anchoring agent anchor cable support is more and more widely used in mine roadways, tunnels, underground chambers and other underground structures. The small-diameter anchor cable support using resin anchor...

AI Technical Summary

Problems solved by technology

Since the roof aquifer is generally distributed in a wide range and the water state changes greatly, the method of roof grouting is high in cost, poor in effect and affects normal roadway excavation

Grouting is used to anchor the anchor cable. The anchor cable body is a hollow structure, the anchoring strength is low, the construction procedure is complicated, and when the anchor cable hole is sprayed with water, the grouting effect is not easy to control, which buries hidden dangers for subsequent mining safety.

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