Drilling tool with variable stirring angle

Abstract

The invention provides a drilling tool with a variable stirring angle. The drilling tool comprises a drilling tool pipe body, a plurality of groups of first stirring blades and cutting blades, wherein the drilling tool pipe body is provided with a male joint, a lower guniting opening, a second built-in pipeline and an air spraying opening; three male plate through holes of the male joint are formed and are in equilateral triangle symmetrical arrangement in the radial direction of a male fixing plate; the second built-in pipeline is arranged in an inner cavity of the drilling tool pipe body through a plurality of second pipeline frames; the plurality of groups of first stirring blades are symmetrically arranged on the outer wall of the drilling tool pipe body at intervals from top to bottom; each group of first blades are arranged on the outer wall of the drilling tool pipe body in a vertically crossed and certain-distance-interval way; and an included angle delta 1 between a first blade seat and the axial center line of the drilling tool pipe body is 45 degrees to 55 degrees. The drilling tool has the advantages that the stirring blade angle change is performed by adapting to different geological conditions; the guniting on the peripheral soil body is realized in different stages during the drilling down and the lifting of a drilling rod so as to promote the sufficient stirring of the peripheral soil body and cement slurry; the vertical homogeneity and the intensity consistency of a pile body are achieved; the construction period is effectively shortened; and the construction cost is reduced.

Description

technical field [0001] The invention relates to a drilling tool capable of changing the mixing angle, in particular to a cement-soil mixing pile drilling rig for underground water-stop curtain wall construction, foundation pit excavation enclosure, embankment anti-seepage treatment and foundation reinforcement improvement. Background technique [0002] At present, the cement mixing pile construction technology is widely used in industrial construction and urban construction foundation construction. Through the special multi-axis soil mixing drilling rig, during the drilling and lifting of the drill pipe, the cement slurry curing agent is sprayed from the front end of the drill bit, and the loose Soil, gravel and curing agent are forced to mix to build a cement-soil mixing and strengthening foundation with integrity, water stability and certain strength. A large number of construction cases show that the internal homogeneity of the pile body varies greatly during the formatio...

AI Technical Summary

Problems solved by technology

[0003] The cement-soil mixing pile drilling rigs in the prior art generally adopt the grouting and air injection methods at the bottom of the drill bit. As the drilling depth increases, the drill bit receives the soil The confining pressure is high, and the grout injection resistance is large, resulting in insufficient cement grout in the surrounding soil, and it is difficult to ensure that the cement grout and soil are evenly mixed, thus affecting the homogeneity of the pile body

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