Underground coal mine hydraulic oriented roof cutting equipment and construction method thereof

Abstract

The invention discloses underground coal mine hydraulic oriented roof cutting equipment and a construction method thereof. The equipment mainly comprises an anti-explosion pump station, liquid feedinglong tubes, liquid returning long tubes and lateral thrusters, wherein each lateral thruster consists of a plurality of lateral thrusting bars which are connected in series through connecting tubes and connecting rods; and a plurality of hydraulic jacks are arranged on one side of each lateral thrusting bar. The construction method using the equipment comprises the steps of during construction, drilling holes through an advance face, mounting the lateral thrusters in the drilled holes through a lagging face, providing hydraulic force for the lateral thrusters by the anti-explosion pump station, carrying out lateral thrusting by the hydraulic jacks while liquid is fed by the liquid feeding long tubes so as to generate huge thrust to split off top rock of a free face to cut a roof and reduce pressure of surrounding rock of a goaf side; and stopping liquid supplying of the liquid feeding long tubes and releasing pressure, supplying liquid by the liquid returning long tubes, and withdrawing the hydraulic jacks. The underground coal mine hydraulic oriented roof cutting equipment can be used for the fields of coal mine roof cutting and pressure releasing, non-pillar mining, prevention and control of rock burst and the like.

Description

technical field [0001] The invention belongs to the field of mining without coal pillars in underground coal mines, and in particular relates to a coal mine underground hydraulic directional top-cutting equipment and a construction method thereof. Background technique [0002] In the application of coal pillarless mining, through the implementation of directional roof cutting technology on the roof, a part of the cantilever beam of the roof is cut off, which reduces the pressure brought by the roof, improves the stability of the surrounding rock, and reduces the deformation of the surrounding rock along the goaf. Improve support safety and reduce support costs. At present, blasting technology and hydraulic fracturing technology are mainly used to perform directional roof cutting and pressure relief on the roof. Both are drilled in a row to the roof, and high pressure is generated in the holes, and cracks are generated in the rocks in the adjacent space under the action of t...

AI Technical Summary

Problems solved by technology

Blasting roof cutting technology, the disturbance generated by the blasting shock wave is large, which affects the stability of the roadway, the blasting produces more toxic and harmful gases, and there is a risk of dumb guns, high safety risks, and there are many uncertainties in the blasting roof cutting. The key parameters of inclination and inclination often require downhole tests, and the evacuation of personnel is required during the blasting, which is time-consuming and laborious, which affects the work progress to a certain extent and causes tension in the working face. Moreover, as explosives are controlled commodities, the procurement and transportation are very strict and the procedures are complicated.

Hydraulic roof cutting technology has a wide range of applications, but hydraulic fracturing technology causes a large increase in water content in the roof of the working face. For mines where the roof and floor are made of mudstone, which is easy to swell and collapse when exposed to water, it is not conducive to the management of the working face and roadway roof. Difficulties, which seriously affect downhole production

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