Reaming drilling tool

Abstract

Disclosed is a reaming drilling tool. The reaming drilling tool comprises a hollow tube body, an enlarged cutting wing, a first cutting wing, a second cutting wing, multiple groups of stirring blades, and wear-resisting plates, the stirring blades are arranged in the outer wall of the hollow tube in an up-and-down spaced mode, and an included angle of 90 degrees is formed between the two relative groups in the radial direction; the first cutting wing and the second cutting wing are both in a two-head form and arranged on the outer wall of the hollow tube body in a radial mode around the hollow tube body, and an included angle of a certain angles is formed in the radial direction of the hollow tube body; the wear-resisting plates are fixedly arranged on the stirring blades, the enlarging cutting wing, the first cutting wing, the second cutting wing and the free end arc surface which has the same axis with the hollow tube body respectively; an included angle of a certain degree is formed between a first wing blade and a second wing blade in the radial direction of the tube body of a drilling tool; an enlarged cutter body, a first cutter body and a second cutter body are made of cemented carbide blocks. The reaming drilling tool has the advantages that the reaming is simple, the strength of the cutter bodies is high, the wear resistance of spiral blades is high, the drilling capacity is high and the stirring is sufficient, and therefore the drilling efficiency and construction quality are effectively improved.

Description

technical field [0001] The invention relates to a drilling tool, in particular to a reaming drilling tool for foundation construction. Background technique [0002] With the development of high-rise buildings, large bridges and urban subway infrastructure projects, the construction of mixing piles has the advantages of simple equipment, no vibration, no noise, no lateral extrusion of the surrounding soil, short construction period and low project cost. The long spiral equal-diameter pile drilling rig is widely used, and the equal-diameter pile is limited due to poor bearing capacity, and a large number of new bearing piles such as various bottom expansion piles and gourd piles are also used in foundation engineering construction. At present, the reaming methods of reaming drills generally include mechanical reaming and hydraulic reaming. The work of mechanical reaming drills is that the reaming wings open with the help of self-gravity when the drill pipe is lowered, and they...

AI Technical Summary

Problems solved by technology

At present, the reaming methods of reaming drills generally include mechanical reaming and hydraulic reaming. The work of mechanical reaming drills is that the reaming wings open with the help of self-gravity when the drill pipe is lowered, and they are closed by themselves with the help of leverage when they are lifted. , this kind of reaming drill has the problem that the reaming size cannot be guaranteed; while the hydraulic reaming drill uses a hydraulic expansion cylinder to ream and retract, and the expansion cylinder it uses is generally arranged on the outer wall of the drill pipe or the inner cavity of the drill pipe. During the expansion process, the oil cylinder is eroded by compressed air, mud and other substances. The processing accuracy and sealing performance of the expansion cylinder are very high, and the manufacturing and assembly are difficult. The failure of the seal during use is likely to cause hydraulic system failure. During the process of running in the drilling tool, it is necessary to open the extension arm in time for the reaming operation, and it is often impossible to operate as required

[0003] In the construction of high-rise buildings, large bridges and urban subway infrastructure projects, it is often encountered that the ground is not uniform, and sand and gravel are mixed. The reaming drilling tool at the lower end bears greater drilling and stirring resistance, resulting in serious quality problems such as severe wear of the cutting edge of the drilling tool, serious blade wear, and uneven mixing, which greatly reduces operating efficiency and seriously affects the quality of the improved reinforcement. overall strength

Images