Underground coal mine fully mechanized mining face end mining and rapid withdrawing method

Abstract

The invention discloses an underground coal mine fully mechanized mining face end mining and rapid withdrawing method. The method comprises the steps of S1, arrangement of a fully mechanized mining face; S2, end mining protection; and S3, quick withdrawing of the fully mechanized mining face. According to the method, protective measures and fully mechanized face withdrawing operation during roadway withdrawing and fully mechanized face end mining are optimally designed, the tunneling and supporting cost of an auxiliary withdrawing channel is reduced, the sinking speed of a top plate of the withdrawing channel is remarkably reduced, the floor heaving amount of the roadway is remarkably reduced, the labor intensity is reduced, the withdrawing time is shortened, the safety performance is improved, and the auxiliary withdrawing channel can be reused for the second time, so that the environment-friendly emission of solid waste is realized, and the emission cost of the solid waste is reduced.

Description

Technical field: [0001] The invention relates to a fully-mechanized coal mining face end mining and rapid withdrawal method in an underground coal mine, belonging to the technical field of coal mining in underground coal mines. Background technique: [0002] When working in underground mining, the coal face is often figure 1 The layout shown in the diagram includes the auxiliary roadway (1) in the mining area, the rubber transport roadway (2) in the mining area, the return air roadway (3) in the mining area, the rubber transportation channel (4), and the return air channel (5) , the main withdrawal channel (6), the auxiliary withdrawal channel (7), the connection lane (8), the eye-cut laneway (9), the working face return air bypass (10), etc. [0003] In the rubber transport alley (2) of the mining area, there is an alley belt conveyor that transports the coal mined from the fully mechanized mining face to the ground; machine (arranged on the side of the roadway near the r...

AI Technical Summary

Problems solved by technology

[0006] First: The number of operators is large. Except for the two processes of net collection, coal cutting and net laying, the operators in the other processes are exposed to the coal wall of the fully mechanized mining face and the empty roof of the front beam of the hydraulic support for a long time. Potential There are many unsafe factors, which pose a greater threat to the safety of operators

[0007] Second: Before the coal cutting and net laying process, the operator needs to climb up to work very frequently when setting up the anchor rod for the grid, installing the wire rope for the grid, and connecting the grid. Increased safety factors pose a threat to the safety of operators

[0008] Third: During the period of accessing the network and connecting to the network, the frequent lifting and lowering of the hydraulic support is used to lift the net roll, which is extremely unfavorable to the roof management of the fully mechanized mining face. There are many potential safety hazards, and local roof fall accidents are prone to occur, which seriously threatens the personal safety of operators.

[0011] First: The design of the traditional retraction roadway is unreasonable. During the final mining period, the mine pressure around the retraction channel is obvious. The main and auxiliary retraction channels are under the influence of the dynamic pressure of the fully-mechanized mining face. ; The concrete floor around the withdrawal channel needs to be completely excavated, and the roadway floor should be repaired again. The adverse effects of the peripheral auxiliary transportation system prolong the withdrawal period of the fully mechanized mining face equipment, and the continuous bottom drum of the main withdrawal channel brings the withdrawal of the hydraulic support. Seriously affected, the retracement cycle was further extended

[0012] Second: The retraction equipment on the head side of the scraper conveyor has a single outbound route, which significantly restricts the retraction speed

[0013] Third: The team on the head side of the scraper conveyor, the key work in the early stage of the withdrawal is forced to put the equipment on the side of the rubber transportation along the trough of the withdrawal, and the equipment in the fully mechanized mining face cannot be withdrawn earlier. With the loss of time, the roof will be damaged Mining pressures such as subsidence and floor heaving will be more obvious, which will have varying degrees of impact on the safe withdrawal of fully-mechanized mining face equipment in the next step

[0014] Fourth: The pre-tightening effect of the press anchor is poor, the area of ​​the anchor tray is small, and the top leakage phenomenon often occurs due to the edge of the net detaching from the press anchor during the retraction period

[0015] Fifth: When the retraction period of the fully mechanized mining face is extended to more than 30 days, it will have varying degrees of impact on the closure of the goaf of the fully mechanized mining face, which is not conducive to the management of fire prevention and extinguishing of the goaf

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