Coal seam drilling hole-collapse preventing lower sleeve device capable of drilling along with drill and drilling method

Abstract

The invention discloses a coal seam drilling hole-collapse preventing lower sleeve device capable of drilling along with a drill and a drilling method. The device is particularly formed by a cavel drill (1), a hose bit (2), a combined propelling device (3), a mesh sleeve (4) and a twisting drill rod (5). According to the coal seam drilling hole-collapse preventing lower sleeve device, in the drilling process of the drill and the drilling process of the twisting drill rod, the combined propelling device (3) is utilized to drive the mesh sleeve (4) and the hose bit (2) to rotate together, and consequently drilling of the twisting drill rod and coal breaking drilling of the hose bit are simultaneously carried out so as to drive the mesh sleeve to drill into a coal hole. When the coal hole reaches a predetermined depth, the twisting drill rod is retreated from the interior of the sleeve, and the mesh sleeve is left in the coal hole. Therefore, the coal seam drilling hole-collapse preventing lower sleeve device plays a role in preventing the coal hole from collapsing and avoids the occurrence of the condition that the drill hole is obsolete.

Description

technical field [0001] The invention relates to a device for lowering sleeves while drilling, which is researched on coal seam drilling that is prone to collapse, and belongs to the field of coal mine safety. The hole method is often used in coal mines. Background technique [0002] As everyone knows, after coal seam drilling is carried out in the soft coal seam, it is easy to collapse the hole. Basically, hole collapse will occur in the process of withdrawing the drill, which often leads to the ineffectiveness of various measures, thereby seriously affecting the safe production of coal mines. At present, the method of drilling anti-collapse holes in coal seams is basically to drill coal holes first, then quickly cement grouting, and then sweep the holes. However, this method cannot be realized when the coal seam conditions are soft. It has already been blocked, and there is no time for grouting. Contents of the invention [0003] For the problems referred to above, the...

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Problems solved by technology

[0002] As we all know, after coal seam drilling in soft coal seams, it is easy to cause hole collapse

Basically, the hole will collapse during the process of withdrawing the drill, which often leads to the ineffectiveness of various measures, thus seriously affecting the safe production of coal mines.

At present, the method of drilling anti-collapse holes in coal seams is basically to drill coal holes first, then quickly cement grouting, and then sweep the holes. However, this method cannot be realized when the coal seam conditions are soft. It's already blocked, and it's too late to inject grout

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