Grouting reinforcement method for broken top board in coal seam during surface drilling and grouting device

Abstract

The invention provides a grouting reinforcement method for a broken top board in a coal seam during surface drilling and a grouting device. The method is large in operation space and does not need thespecial step of hole sealing, thereby reducing the technical difficulty of borehole grouting. Defects in the prior art are resolved such as great limit of underground grouting to drilling angles, small grouting range, great difficulty in hole sealing, outflow possibility of slurries and poor grouting effect. According to the broken top board in a coal seam and the ground condition, the grouting method comprises the following steps: setting borehole density, depth and diameter and orderly performing drilling operation; selecting proper grouting material and utilizing the grouting device to perform grouting operation. The grouting device utilizes a metering pump to suck raw material. The raw material is prepared at accurate ratio. By arranging a pressure gage and a flowmeter, grouting pressure and flow are stable and controllable. The slurry dispersion area is large. The grouting effect is good. Multi-hole grouting technology helps achieve all-round cover of the broken top board. The overall strength of super thick, relatively thick broken top boards in the coal seam are greatly increased.

Description

technical field [0001] The invention belongs to the field of grouting reinforcement for broken roofs of coal seams, and relates to a method for preventing the collapse of extra-thick broken roofs from affecting hydraulic supports and coal walls of working faces, especially a method of grouting from ground drilling to extra-thick broken roofs of coal seams method of reinforcement. Background technique [0002] There is a thicker direct roof above the working face of some coal mines in my country, and the roof is easily broken. It is mainly characterized by large thickness of rock formation, low strength of rock formation, high degree of fracture development, poor integrity, and low self-stabilization ability. The roof of the face and the roof of the roadway are caving, and there are safety hazards such as coal wall slabs, roof leakage, roof collapse, and hydraulic support in the triangular area. The main factors causing this phenomenon are the poor physical and mechanical pro...

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Problems solved by technology

[0006] The object of the present invention is to provide a method and a grouting device for grouting reinforcement from ground drilling to the broken roof of the coal seam, to at least solve the problem that the current roof drilling construction angle is relatively large, the grouting range is small, the hole sealing is difficult, and the grout is easy. Problems such as outflow and poor grouting effect

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