Efficient high-strength composite drill bit

Abstract

The invention relates to a high-strength composite drill bit, which comprises a drill pipe, a lower cutter body consisting of a lower cutter head and a lower cutter handle, an inner cutter body consisting of an inner cutter head and an inner cutter handle, blades, and an outer cutter body consisting of an outer cutter head and an outer cutter handle, wherein the lower cutter body is fixed at the lower end part of the drill pipe, the inner cutter body is fixed on the periphery surface at the lower part of the drill pipe, the number of the blades is 2-4, and the blades are uniformly fixed in a radiation form on the periphery surface at the lower part of the drill pipe and are positioned above the inner cutter body; the outer cutter body is fixed on the blades; the lower cutter head in the lower cutter body, the inner cutter head in the inner cutter body and the outer cutter head in the outer cutter body are respectively welded together with the lower cutter handle, the inner cutter handle and the outer cutter handle; the front ends of the lower cutter head, the inner cutter head and the outer cutter head are respectively provided with a lower cutting edge, an inner cutting edge and an outer cutting edge; and the installation directions of the lower cutter body, the inner cutter body and the outer cutter body are the rotation directions which make the lower cutter head, the inner cutter head and the outer cutter head arranged towards the drill pipe. The working efficiency of the drill bit is multiplied, the combination strength of the cutter head and the cutter handle is high, the wear of the cutter head and a rib is slowed down, and the construction quality is ensured.

Description

technical field [0001] The invention relates to a high-efficiency and high-strength drill bit capable of penetrating strata, especially hard sand strata, and can be widely used in underground deep foundation projects such as underground facilities of high-rise buildings, foundation pit enclosure of subway stations, and reinforcement of river embankments. Background technique [0002] In the construction process of underground foundation projects such as urban high-rise buildings, deep foundation pit enclosure of subway stations, anti-seepage reinforcement of river dykes and soft soil foundation improvement and reinforcement, a large number of SMW construction method equipment is currently used to construct underground diaphragm walls, that is, multi-axis drilling rigs are used. The technology of continuously drilling, mixing soil and cement slurry in situ and inserting section steel to build underground retaining and waterproof walls, which plays the role of retaining soil an...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the drill bits of multi-spindle drilling rigs generally adopt improved long helical drilling tools and drill bits, such as a new type of drilling tool, the patent number is ZL200720070011.2, which is fixed on the front end of the drill rod by two helical blades , The three-row cutter body is arranged crosswise and fixed on the bottom edge of the two helical blades, and the head of the cutter body is surfacing with tungsten carbide. When the multi-axis drilling rig is drilling in the hard sand formation, the cutting edge of the cutter head will be severely worn. Quality problems such as falling off of the cutter head and blade wear and fracture not only affect the construction efficiency of the drilling operation, but also make the drilling quality unstable, directly affecting the construction quality of the underground diaphragm wall

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