Reusable anti-hole collapse drilling apparatus and drilling method thereof

Abstract

The invention discloses a reusable anti-hole collapse drilling apparatus and a drilling method thereof, which apparatus comprises a drill bit, a screw drill pipe, a screw drill tube, a plug, a rotor and a pin. A shank portion of the screw drive pipe is cylindrical, and both head and tail thereof are square stems, a screw thread is welded on the shank portion, and the drill bit is connected with the head square stem of the screw drill pipe. The screw drill tube is a steel tube, alloy drill teeth are welded to the top of the screw drill tube, and a screw member is welded to the outer side of the drill tube. The screw drill tube, the screw drill pipe and the drill bit are integrated, the screw drill tube and the screw drill pipe synchronously advance during drilling, the screw drill pipe is removed after a borehole is formed, the screw drill tube is retained in the borehole, and the borehole is effectively protected; after the borehole is fully utilized, the screw drill tube can be removed for reuse.

Description

technical field [0001] The invention relates to the technical field of drilling equipment for crushing soft rock, in particular to a reusable drilling device and a drilling method for preventing borehole collapse during drilling and after drilling. Background technique [0002] In geotechnical engineering and mining sites, it is often encountered in the case of drilling holes in broken soft rocks. If the holes are not protected during drilling or after the holes are formed, hole collapse will occur. Bring a lot of trouble, time-consuming and labor-intensive. At present, the equipment for drilling holes on the engineering site often has no hole protection measures. It simply drives the drill bit through the drill pipe to drill, and the diameter of the drill bit is larger than the drill pipe. After the hole collapses, it needs to be re-drilled. In view of the defects of existing equipment, some scholars have researched and designed related anti-collapse drilling tools. Exis...

AI Technical Summary

Problems solved by technology

Although this patent protects the hole wall during the drilling process, the expansion and contraction of the drill edge may bring out the casing and damage the casing when the drill is withdrawn; the existing patent CN103277122A discloses a method for drilling anchors in broken roofs. Rod hole and anchor rod anchoring method, the casing is put on the outside of the drill pipe to protect the hole, although it can protect the drill hole, but after the hole is formed, the drill pipe can only be withdrawn, and the drill bit is abandoned in the hole, which increases the Cost; Existing patent CN103114810B discloses a kind of coal seam drilling anti-collapse hole while drilling into the lower sleeve device and drilling method, including horn drill bit, barrel drill bit, combined propulsion device, mesh sleeve and twist drill rod, When drilling, the mesh sleeve and the drill pipe are drilled at the same time, which can better prevent the hole from collapsing, but the patent does not specify whether the sleeve drill bit can exit the drilling hole with the twist drill pipe

In addition, the existing patent CN104453728A (an anti-collapse hole device and its drill bit structure), the existing patent CN203081286U (anti-collapse hole drilling tool), the existing patent CN102226389A (coal mine drilling anti-collapse hole pipe network and anti-collapse Hole method) and the existing patent CN203066865U (a kind of reamable anchor drill bit) etc. all involve the protection of the borehole, but none of them mention the reuse of the hole protection pipe, that is, the drill pipe jacket

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