Sand filtering and drainage device for borehole wall drilling

Abstract

The sand filtering and water draining device comprises a filtering cap, a first-stage filtering cavity and a second-stage filtering cavity which are communicated with each other are formed in the filtering cap, a first-stage filtering layer is arranged in the first-stage filtering cavity, one end of the first-stage filtering layer is communicated with the second-stage filtering cavity, the other end of the first-stage filtering layer is connected with a guide pipe, and the outer wall of the guide pipe is sleeved with a hollow rubber plug; and a second-stage filtering layer is arranged in the second-stage filtering cavity. The first-stage filtering cavity and the second-stage filtering cavity are formed in the filtering cap, water and sand are filtered twice, the sand blocking precision can be effectively improved, sand loss is reduced, the well wall is kept stable, the grouting hole sealing difficulty is reduced, the grouting hole sealing quality is improved, meanwhile, the hollow rubber plug is arranged on the outer wall of the guide pipe, and the sealing effect is good. The guide pipe can be fixed in an auxiliary mode, the elastic characteristic of the hollow rubber plug is utilized, the hollow rubber plug abuts against the inner wall of the borehole wall drill hole after being plugged into the borehole wall drill hole, and water and sand can be effectively prevented from leaking out of a gap between the borehole wall drill hole and the filter cap.

Description

technical field [0001] The invention relates to the technical field of coal mine construction, and more specifically relates to a sand filter and drainage device for borehole wall drilling. Background technique [0002] During the construction and production of the mine, water and sand flow into the mine through the weak area of ​​the shaft wall. When the amount of water and sand in the mine is too large, mine water damage will occur. Drilling on the well wall is a common measure for water damage control in complex mines, and the pressure is relieved by drilling on the well wall. However, when the mine is in a water-rich rock-soil layer, a large amount of groundwater gushes out from the borehole on the well wall due to the high water content of the water-rich rock-soil layer, high water pressure, and loose rock-soil layer, and carries a large amount of sediment. Influx into the mine shaft through drilling, once the amount of sand is too large, the shaft is very easy to caus...

AI Technical Summary

Problems solved by technology

The existing metal mesh sand filter pipes are generally two layers of metal pipes with drain holes inside and outside, and a sand filter device filled with water filter nets between the metal pipes, but these sand filter pipes generally have a long length and cost High cost, poor effect of sand filtration and drainage, etc.

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