Dismantling method of open-pit coal mine end slope bridge

Abstract

The invention discloses a dismantling method of an open-pit coal mine end slope bridge. The end slope bridge is formed by an ouerbvrden material, wherein one end of the end slope bridge is covered on a coal bed slope side of a coal bed, and the other end of the end slope bridge extends to the inside of a refuse dump. The method comprises the following steps: step one, determining a coal-rock interface between the end slope bridge and the coal bed; step two, arranging a hydraulic backhoe on the coal-rock interface; step three, stripping the ouerbvrden material in the surface to be stripped layer by layer according to a reverse mining manner till the construction is completed. The dismantling method of the open-pit coal mine end slope bridge is characterized by carrying out secondary stripping from an overlapping surface of the end slope bridge, separating the coal from the rock and mining the coal resource pressed and covered by the ouerbvrden material. Through the method, an optimally economical and reasonable stripping ratio is achieved; the production cost can be reduced to minimum.

Description

Technical field [0001] The invention relates to the technical field of open-pit coal mining, in particular to a method for removing an end bridge in an open-pit coal mine. Background technique [0002] After a single thick seam near-horizontal open-pit coal mine is fully internally drained, since all the stripped material enters the internal dump, the end bridge forms a series of vertical end-slope transportation channels from top to bottom, which also exist on the rock steps close to the roof of the coal seam In order to improve the resource recovery rate, the transportation channel will recover the coal seam under the end bridge in a short period of time, and then backfill one piece from the coal seam roof to the overlying rock steps or coal seam roof to the goaf near the end bank according to the design elevation The dump bridge leading to the inner dump, at this time the end bridge is completely covered by the inner dump near the end of the bridge. [0003] The dump bridge (en...

AI Technical Summary

Problems solved by technology

[0003] The soil-discharging bridge (end-side bridge) lapped on the overlying rock layer on the roof of the coal seam is very beneficial to shorten the truck distance of the lower stripped steps at the initial stage of formation. However, as the work line continues to move forward, the end-side bridge service cycle In the final stage, the effect of end-side bridges in shortening the distance of trucks can no longer be effectively utilized. Exceeding the critical economically reasonable distance will also restrict the output of end-side coal. Therefore, it is necessary to consider relocating the original end-side bridges during this period.

[0004] The relocation of the end-side bridge first needs to separate the coal and rock from the coal-rock joint. Traditionally, a wheel loader is used with an electric wheel dump truck to carry out a secondary separation of the stripped objects outside the coal-rock interface of the end-side soil discharge bridge. Stripping, because the loading method of the front-mounted machine is the front shovel digging type, it is necessary for the bulldozer to push down the stripping material to open a gap to form a working surface. After the working surface is formed, a certain buffer flat section is left, and then the bulldozer builds the inner dump site When excavating the second and third floors, the opening of the upper layer is repeated. The process is relatively complicated, the amount of bulldozers is large, the construction is difficult, the coal and rock are mixed, and the efficiency is low.

Images