Dragging tube type filling method of thin coal bed fractured roof

Abstract

A dragging tube type filling method of a thin coal bed fractured roof includes arranging a filling main pipe in a gateway, connecting a high-pressure rubber pipe to the filling main pipe through a reducing tee, and connecting a high-level filling steel pipe to the filling main pipe; connecting a plurality of filling pipes to the high-pressure rubber pipe in parallel mode, simultaneously fixedly connecting each filling pipe to a work face hydraulic support between a gob and a coal bed and extending filling openings of the filling pipes into the gob; penetrating a filling opening of the high-level filling steel pipe through a roadside filling wall and extending the filling opening into the gob, wherein the height of the filling opening is higher than that of the filling opening of each filling pipe; starting to fill the gob till the gob is filled up, and finishing the filling work of the gob; when the working face is pushed forwards, moving the filling pipes along with the hydraulic support to enter a new gob, manually adjusting the position of the high-level filling steel pipe to enable the forwards moving distance of the high-level filling steel pipe to be synchronous with forwards moving step distance of the hydraulic support; and repeatedly filling till excavating is finished.

Description

technical field [0001] The invention relates to a coal mine filling method, in particular to a pipe dragging filling method suitable for the broken roof of a thin coal seam. Background technique [0002] Thin coal seam coal fields are very common in my country's coal mines, such as the Yellow North thin coal field is a typical thin bedrock, thick topsoil coal seam. Its thin coal seam mainly refers to seven or ten seam coal, the thickness of the bedrock is generally 30-40 meters, the thickness of the topsoil is generally about 200m, the thickness of the coal seam is only about 1.2m, the inclination angle is small, the gas is high, the water inflow is large, and the roof is abnormally broken , the surface is the alluvial plain of the Yellow River North, the minefield is flat, the water level is about 1.5 meters below the surface, the subsidence coefficient of the surface after mining is 0.82, the ground buildings are relatively dense, and underground mining has a great impact ...

AI Technical Summary

Problems solved by technology

Several filling methods are currently used, such as paste filling, high-efficiency racking and gangue filling, high-water filling, etc., due to relatively high filling costs, the cost of paste filling is 120 yuan / ton, and the cost of high-efficiency racking and gangue filling is in 100 yuan / ton, the cost of high water filling is 160 yuan / ton, which is unacceptable to the mine

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