Device and method for sealing hole by using returned slag of layer-through drill hole of low drainage roadway of coal mine

Abstract

The invention relates to a device and a method for sealing a hole by using returned slag of a layer-through drill hole of a low drainage roadway of a coal mine. The device comprises a hole sealing pipe located in an upward rock layer-through drill hole of a top plate of the low drainage roadway, a support part located between the hole sealing pipe and the wall of the drill hole and used for fixing the hole sealing pipe inside the drill hole, a front sealing section located in a gap between the hole sealing pipe at the opening end of the drill hole and the wall of the drill hole, and a fixed sealing section located in a gap between the hole sealing pipe behind the front sealing section and the wall of the drill hole and formed by solidifying the returned rock slag. The method comprises the steps of: firstly performing upward layer-through drilling; then mounting the hole sealing pipe; arranging a waterproof wear-resistant material at the opening end of the drill hole for sealing and blocking; then performing second drilling to enable the returned rock slag formed in the drilling process to be filled in the gap between the hole sealing pipe and the inner wall of the drill hole, and forming a firm hole sealing material after solidification. The returned rock slag formed after the coal rock layer is drilled and crushed is utilized to form the firm hole sealing material, so that the hole sealing material is saved efficiently and the hole sealing cost is reduced while excellent hole sealing performance is ensured.

Description

technical field [0001] The invention belongs to the technical field of coal mine mining, and relates to a sealing device and a method for sealing a hole of a coal mine through-layer drilling and returning slag. Background technique [0002] In the process of coal mining, it is usually necessary to drill holes through the floor of the outburst coal seam, and bury drainage pipes in the holes to realize the extraction and utilization of gas. In order to prevent air from entering the borehole through the rock gap around the borehole, the process of sealing the borehole is called hole sealing. [0003] At present, both ends of the drainage pipe in the borehole are mostly blocked by polyurethane, and cement mortar is injected in the middle to seal the hole. [0004] For example, China Pingmei Shenma Group's top-penetration drilling is divided into cover-type top-penetration drilling and pre-pumping top-penetration drilling. The relevant parameters are shown in Table 1: [0005] ...

AI Technical Summary

Problems solved by technology

[0008] 1) The sealing process is relatively cumbersome, both ends are sealed with polyurethane, and cement mortar needs to be injected to fill;

[0009] 2) Cement mortar needs to be transported from the ground, and workers need to carry it to the construction site in bags, and the labor intensity of workers is very high

There is no mature standard for the proportion of cement mortar and the required cement grade;

[0010] 3) The cost of hole sealing is relatively high: the cost of polyurethane sealing alone is about 300 yuan / hole, and the cost of gas drainage pipe and cement mortar injection pipe is about 450 yuan per hole, plus the cost of cement mortar is 50 yuan, The cost of sealing a single hole is about 800 yuan

[0011] 4) The construction of the sealing process and the drainage drilling are carried out separately, and the labor input is high

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