Composite drilling tool

Abstract

A composite drilling tool comprises a hollow pipe body comprising an outer joint, first cutting wings, second cutting wings, front-end cutting bodies, a plurality of sets of stirring blades, abrasion-resistant plates and a sealing sleeve. The hollow pipe body is provided with a grouting pipe, an air pipe and a curing liquid pipe, the upper end of the hollow pipe body is located at a fixing ring ofthe outer joint, and the lower end of the hollow pipe body is provided with valves. The sealing sleeve is a bidirectional sealing sleeve, one half of the sealing sleeve is arranged in a step-shaped sunken hole of the fixing ring, and the other half of the sealing sleeve is protruded out of the upper surface of the fixing ring. The multiple sets of stirring blades are arranged on the outer wall ofthe hollow pipe body in an up-down interval mode; the first cutting wings and the second cutting wings are radially arranged on the outer wall of the hollow pipe body; the front-end cutting bodies are located on the outer surface of the lower end of the hollow pipe body; the abrasion-resistant plates are fixedly mounted on the free-end circular arc faces, coaxial with the hollow pipe body, of thestirring blades, the first cutting wings and the second cutting wings; and first, second and third cutting cutter bodies are made of hard alloy blocks. The composite drilling tool has the characteristics that the strength of the cutting cutter bodies is high, the drilling and tunneling capacity is high, stirring is full, and cement slurry, high-pressure gas and curing liquid are injected correspondingly; and the drilling and tunneling efficiency and safety are effectively improved.

Description

technical field [0001] The invention belongs to a drilling tool, in particular to a composite drilling tool for a mixing pile drilling machine used for the construction of an underground continuous wall and the improvement and reinforcement of a soft soil foundation. Background technique [0002] With the rapid development of the national economy, major cities in my country are speeding up the construction of urban rail transit, the development and utilization of underground space, the isolation of landfill sites and the reinforcement of river dam foundations. Among them, a type of steel cement soil is often used The composite mixing pile construction technology (that is, the SMW underground diaphragm wall construction technology) uses the power head to drive the hollow drill pipe and hollow drilling tool connected to its output shaft. After the drilling tool rotates, the front cutter body is used to carry out drilling and mixing construction, such as During the construction...

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to overcome the shortcomings of the existing mixing pile drilling tools, and provide a composite drilling tool with high cutting head hardness, high wear resistance of cutting blades, sufficient mixing, high sealing performance and easy operation , to effectively ensure that the drilling rig applies solidifying liquid, sprays high-pressure gas and injects cement slurry at different stages, thereby ensuring the construction quality and construction safety of the underground diaphragm wall

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