Anti-distortion welding type extension section for drill rod of rotary drilling machine

Abstract

The invention relates to the technical field of piling, and particularly discloses an anti-distortion welding type extension section for a drill rod of a rotary drilling machine. The anti-distortion welding type extension section comprises a square head, a steel pipe, a square head connecting seat, a plurality of key strips and a plurality of rib plates, wherein one end of the steel pipe is connected with the square head, the other end of the steel pipe is connected with the square head connecting seat, the plurality of key strips are uniformly distributed on the outer side of the steel pipe, and a plurality of rib plates are arranged at the joint of the steel pipe and the square head connecting seat. The anti-distortion welding type extension section for the drill rod of the rotary drilling machine is simple in structure, the steel pipe is connected with the square head and the square head connecting seat in a welded mode, the length of the steel pipe reaches 3-4 m, the problem that the drilling depth of the drill rod is not enough is solved, and the rib plates are welded to the connecting position of the steel pipe and the square head connecting seat, key bars are welded on the outer side of the steel pipe in the circumferential direction to reinforce, so that the problem that a broken square head falls into a pile hole and cannot be salvaged is solved, and meanwhile, the problem that the steel pipe is easy to twist due to overlarge bearing pressure and torsion in the construction process is also solved.

Description

technical field [0001] The invention belongs to the technical field of piling, in particular to an anti-twisting welded extension joint used for a drill pipe of a rotary excavator. Background technique [0002] In the existing technology of the rotary drilling rig in the process of engineering construction, the pipe body of the drill pipe and the connection part of the square head are connected by welding. During the construction process of highways, railways, bridges, high-rise buildings, etc. The rod will bear the combined stress of shearing, torsion, and pressure at the same time. Therefore, during the construction process due to improper operation by the operator, the weld between the pipe body and the square head and the material around the weld often break at the lower end of the core rod, resulting in square The head part falls into the pile hole, and it is very difficult to salvage, and sometimes it is even impossible to salvage, which affects the construction progre...

AI Technical Summary

Problems solved by technology

[0002] In the existing technology of the rotary drilling rig in the process of engineering construction, the pipe body of the drill pipe and the connection part of the square head are connected by welding. During the construction process of highways, railways, bridges, high-rise buildings, etc. The rod will bear the combined stress of shearing, torsion, and pressure at the same time. Therefore, during the construction process due to improper operation by the operator, the weld between the pipe body and the square head and

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