Broaching drilling tool

Abstract

A broaching drilling tool comprises a hollow pipe body, an enlarging cutting wing, a second cutting wing, a plurality of stirring blades and wear-resisting plates; the multiple stirring blades are arranged on the outer wall of the hollow pipe body in a vertically-spaced mode, and every two opposite stirring blades form an inclined angle of 90 degrees in the radial direction; the second cutting wing is in a double-head shape and arranged on the outer wall of the hollow pipe body in the mode that the hollow pipe body is enclosed in a radial mode, and an inclined angle of a certain degree is formed in the radial direction of the second cutting wing; the wear-resisting plates are fixedly installed on the free end arc surfaces, which are with the same axle center as the hollow pipe body, of the stirring blades, the enlarging cutting wing and the second cutting wing correspondingly; and second wing pieces from an inclined angle of a certain degree in the radial direction of a drilling tool pipe body, and an enlarging knife body and a second cutting knife body are each made of hard alloy blocks. The broaching drilling tool has the characteristics of being easy and convenient to broach, high in cutting knife strength and spiral piece wear-resisting property, large in drilling and excavating capacity, sufficient in stirring and the like; and drilling and excavating efficiency and the 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

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