Reinforcing method for crushed top plate of coal face

Abstract

A reinforcing method for a crushed top plate of a coal face relates to the safety technical field of the coal face of a coal mine, can reinforce the crushed top plate through the combined action of a wire rope and slurry, forms an unique space grid reinforced structure, overcomes not only the defects of unobvious single grouting reinforcing effect and high cost, but also the defects of large labor intensity, long period and failure in fundamentally solving top leakage when the crushed top plate is treated by erecting a shed, and is obvious in crushed top plate reinforcing effect. Integrated with the advantages of grouting reinforcement, and matched with a specially excavated measure laneway, the method is free of time and space, and can pre-reinforce a composite thin crushed top plate before coal bed exploitation, and reinforce an area with the possibility of top leakage during coal bed exploitation, so as to ensure safe stopping of the coal face.

Description

Technical field: [0001] The invention relates to the field of safe technical operation of coal mining working faces, in particular to a reinforcement method applied to composite soft and broken roofs in coal mining working faces. Background technique: [0002] At present, the composite soft and broken roof seriously threatens the normal production of the working face. Due to the presence of such conditional roofs in most fully mechanized mining faces with large mining heights, large-scale roof leakage accidents occurred many times in the mining process of the working face, and the working face was destroyed. Forced to stop production, seriously affecting the safe and efficient production of coal mining face. [0003] However, the existing methods for strengthening composite soft and broken roofs mainly include the following processing methods: artificial false roofs made of artificial roofs, hanging metal meshes, cement mortar injection, and chemical slurry injection (the re...

AI Technical Summary

Problems solved by technology

[0004] ⑴ The labor intensity and low efficiency of artificial false roofs are high, and after the working face is safely pushed through the scaffolding section, if the roof leaks again at the coal mining face, the roofing and scaffolding must be re-lifted, and the construction period is long, which affects production , poor security;

[0005] ⑵ The bonding degree of hanging metal mesh and cement mortar is poor. When the roof is broken, most of the cement mortar enters the cracks in the rock formation, resulting in too long grouting time. In addition, the solidification time of cement mortar is relatively long, and the roof cannot be reinforced in time, resulting in The reinforcement effect is not ideal, or even the reinforcement fails;

[0006] (3) Mali powder is often used as a reinforcement material for chemical grouting. This method is currently a relatively new and efficient method for controlling broken roofs. Because of its safety, low viscosity, strong adhesion, and good flexibility, it can improve the supporting force of coal and rock , high mechanical resistance and other advantages, it is used by most mines as the first choice to deal with the working face side and roof leakage accidents. Note that Ma Lisan cannot solve the roof leakage accident

[0007] Chinese patent application number 201110457707.1 discloses a thin coal seam trusteeship filling system, which is composed of a filling supervisor arranged on the working face, a high-level filling steel pipe, a high-pressure rubber hose and multiple filling pipes, but the construction of this structure is complicated and the cost is high

However, this method is not suitable for the recovery of coal face

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