A device and method for mining overlying rock isolation and grouting filling drilling through-holes

Abstract

The invention provides a hole dredging device and method for an isolated grouting drill hole in mining overburden rock, and is suitable for underground work of coal mines. The hole dredging device comprises a hole bottom fixing device, a wire rope, a mortar storage device and winches, wherein a fixed pulley is arranged in the hole bottom fixing device; the wire rope is wound on the fixed pulley. When construction of the grouting drill hole is conducted on an end hole, the hole bottom fixing device on which the wire rope is wound is lowered to the bottom of the grouting drill hole by utilizing the winches, and is fixed; two ends of the wire rope are respectively fixed on a sleeve in the grouting drill hole and the top of a drill rod; when the grouting drill hole is blocked, two ends of the wire rope are taken out from the casing pipe and the drill rod, and then connected with the winches on the ground, then the mortar storage device is fixed on the wire rope, the winches are started, the mortar storage device enters precipitated mortar along with the wire rope, is fully filled with the precipitated mortar, and then is lifted to the ground by utilizing the winches. The method is simple, high in effects of hole dredging and mortar cleaning, low in implementation cost, high in reliability, and higher in subsidence control effect of grouting construction, thereby effectively protecting the safety of a ground building.

Description

technical field [0001] The invention relates to a through-hole device and method, in particular to a through-hole device and method for mining overlying rock isolation grouting filling drilling used underground in coal mines. Background technique [0002] In recent years, mining overlying rock isolation grouting filling (patent ZL201210164929.9) has been widely used in coal mining under buildings. High-pressure grouting (fly ash slurry) in the separated layer space, so as to control the deformation of the overlying rock layer and reduce the surface subsidence. Patent ZL201210164928.4 further discloses a coal mining speed control method that matches the isolated grouting and filling of mining overlying strata, through the matching control of the grouting filling volume and the advancing speed of the working face, so as to ensure the control effect of surface subsidence. It is the key to realize the matching between injection and production to ensure the continuous and stable...

AI Technical Summary

Problems solved by technology

Although the former method is simple to operate, the penetration effect is poor, and the blockage in the hole is often not completely cleared, resulting in the inability to continue grouting filling; the latter is relatively more used in engineering, and its specific process is: The slurry drill pipe is lifted to the ground, and then the drill pipe with the drill bit is lowered to drill the plugging section to realize the through hole. The grouting drill pipe is often "locked" by the fly ash deposited in the lower part, resulting in the need to lift the grouting drill pipe with a reverse thread drill pipe, which is a huge workload and extremely difficult, and once it is not handled properly, the grouting drill pipe Will be stuck in the borehole, causing the borehole to be scrapped, resulting in the failure of the entire project

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