Barrel type drilling tool

Abstract

The invention discloses a tubular drilling tool, which comprises connecting parts, a tube body and a cutting tool which are arranged sequentially from top to bottom. The tubular drilling tool also comprises a righting part which is fixedly arranged at the outer side of the upper end part of the tube body, and the revolution external diameter of the righting part is identical with the aperture of a pile hole. Preferably, the righting part comprises a righting sleeve and a plurality of connecting pieces; the righting sleeve is nested at the outer side of the upper end of the tube body; and the plurality of connecting pieces are respectively and fixedly arranged between the righting sleeve and the tube body. The righting part arranged at the upper end part of the tube body butting against the inner wall of the pile hole is adopted in the tubular drilling tool to guarantee the righting of the tubular drill, and the diameter of the tubular drill can be designed into a smaller size. The deep drilling resistance during the graded drilling construction process can be reduced, thereby enhancing the hole forming efficiency; in addition, the defects of pressure and torque insufficiencies can be made up. The tubular drilling tool can be used for rotary drilling rigs or other pile work machinery and can be particularly used for the graded drilling process on hard rock formation under the condition that the pressure of the drilling rig is insufficient.

Description

technical field [0001] The invention relates to a drilling tool for hole forming, in particular to a barrel drilling tool. Background technique [0002] During the construction of bored piles, underground obstacles such as boulders, block stones, large-sized pebbles, and crushed stones are often encountered, so that the construction period of the pile will be extended several times. Therefore, the drilling tool is one of the most critical parts for the pile machinery for hole-forming operations. [0003] At present, in the working conditions where the drilling rig is seriously beating or the torque is obviously insufficient, the drilling construction process usually adopts the step-by-step drilling method. A drill with a small diameter drills a small hole in the center of the pile hole, and finally a drill with the same diameter as the pile hole is used to complete the hole. Compared with the one-time hole-forming process, the staged drilling process can resolve the insuff...

AI Technical Summary

Problems solved by technology

However, due to the large diameter of the barrel drill, there is still the problem of relatively large drilling resistance during the small hole drilling process, and a higher hole forming efficiency cannot be obtained.

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