Drill bit suitable for hard sandy soil

Abstract

The invention discloses a drill bit suitable for hard sandy soil. The drill bit suitable for hard sandy soil comprises a drill bit center assembly, lower cutter bodies, inner cutter bodies, blades, outer cutter bodies, supporting plates and wear-resisting plates, wherein the lower cutter bodies and the inner cutter bodies are fixed to the outer circumferential surface of the lower end and the outer circumferential surface of the lower portion of a drill bit body respectively, the two to six blades are evenly fixed to the outer circumferential surface of the drill bit body in a radial and surrounding mode, the outer cutter bodies are fixed to the lower edges of the blades, two to eight outer cuter bodies are installed on each blade, for all the outer cutter bodies except the outer cutter bodies at the free ends of the blades, the outer cutter bodies on each blade and the outer cutter bodies on another blade are arranged in a cross mode in the rotation position, the blades and the drill bit bodies are fixed through the supporting plates, the wear-resisting plates are fixedly installed on the cambered surfaces of the free ends of the blades, the side faces of the outer cutter bodies at the outermost end and the side faces of the inner cutter bodies respectively, and the lower cutter bodies, the inner cutter bodies and the outer cutter bodies are installed in the directions enabling lower cutter heads, inner cutter heads and the outer cutter heads face the rotation direction of the drill bit body. The drill bit suitable for hard sandy soil has the advantages that the working efficiency can be improved effectively, the combining strength between the cutter heads and cutter handles is high, abrasion of the cutter bodies and the blades is reduced, and the construction quality is guaranteed.

Description

technical field [0001] The invention belongs to a drill bit for construction in the construction industry, in particular to a drill bit for hard sandy soil, which can be widely used in underground deep foundation projects such as underground facilities of high-rise buildings, foundation pit enclosure of subway stations, reinforcement of river embankments and the like. 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 ret...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, the drill bits of multi-spindle drilling rigs generally adopt improved long auger drilling tools and drill bits, such as Chinese Utility Model Patent No. ZL200720070011.2, which is named as a new type of drilling tool, which is fixed by two helical blades. At the front end of the drill pipe, three rows of cutter bodies are arranged crosswise and fixed on the bottom edge of two helical blades, and tungsten carbide is surfacing on the head of the cutter body; Quality problems such as serious wear of the cutting edge, shedding of the cutter head, and wear and tear of the blades 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

Another example is the Chinese invention patent No. ZL201010128294.8, which is named as a high-strength composite drill bit. It uses the lower cutter body to fix the lower end of the drill pipe, and the inner cutter body is fixed to the outer peripheral surface of the lower part of the drill pipe. There are 2 to 4 blades. It is fixed on the outer peripheral surface of the lower part of the drill pipe, and a plurality of outer cutter bodies are fixed in a cross arrangement on each blade, while the lower cutter body, inner cutter body and outer cutter body are welded with hard alloy cutter heads and blades by induction brazing. The arc surface of the free end is equipped with mesh wear-resistant layer and other technologies. When the multi-spindle drilling rig uses this drill bit to drill underground diaphragm walls in hard sandy soil layers, the operating efficiency is greatly improved and the wear of the cutter head is improved. However, due to the large drilling resistance, the wings or blades are warped and deformed, and the wear is serious. At the same time, the knife handle also has serious wear and tear quality problems, which leads to the quality of the underground continuous wall. construction progress

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