Combined type drill applicable to high-spray stirring cement pile

Abstract

The invention discloses a combined type drill applicable to a high-spray stirring cement pile. The combined type drill comprises a hollow cylindrical drill body which is internally provided with a gas path and a slurry path, two first stirring blades and two second stirring blades are distributed oppositely on the outer wall of the drill body; the position, below the second stirring blades, of the lower portion of outer wall of the drill body, is provided with a second nozzle; the lower surface of a drill tip is provided with a third vent hole and a third nozzle; the ends, far away from the drill body, of the first stirring blades, are provided with two fixed plates, a slurry hosepipe and a gas path hosepipe, a nozzle veering seat is arranged between the two fixed plates, locating bolt holes and rolling bearing mounting holes are formed in the two fixed plates, the nozzle veering seat is in a flat cylindrical shape, mounting holes are formed in the center of the two end faces of the nozzle veering seat, a protrusion, a slurry hole and a gas hole are formed in the hook face of the nozzle veering seat, rotation shafts are fixedly arranged in the mounting holes, two ends of the rotation shafts are inserted into a rolling bearing and are tightly coordinated with the inner holes of the rolling bearing so as to achieve the pivot of the nozzle veering seat.

Description

technical field [0001] The invention relates to the technical field of construction of high-jet mixing cement-soil piles in construction engineering, in particular to a combined drill bit suitable for high-jet mixing cement-soil piles and a use method thereof. Background technique [0002] High-spray mixed cement-soil piles can be used not only to strengthen soft soil foundations such as muddy soil, saturated loess, and cohesive soil, but also to be used in conjunction with rigid piles such as pipe piles and steel piles for composite piles. High-spray mixed cement-soil piles have been widely used in foundations due to their wide application range, simple process, and low cost, and have developed rapidly. With the rapid development and application of high-jet mixing cement-soil piles, how to complete the construction of high-jet mixing cement-soil piles quickly, efficiently, and with high quality and quantity has become the focus of attention, and the decision of the construc...

AI Technical Summary

Problems solved by technology

The nozzle of this drilling tool is fixed and has no combination function. The drill bit form cannot be adjusted according to the formation conditions. The adaptability is poor. The nozzle does not protrude along the pile diameter in a stepped shape, and the grouting in the cross section of the pile is not uniform.

[0013] A comprehensive analysis of the above drill bits for pile foundation construction mainly has the following shortcomings: (1) The nozzle of the drilling tool is fixed, the spray angle cannot be adjusted, there is no combination function, and the formation adaptability is poor; (2) The extension length of the stirring fin and the nozzle cannot be adjusted according to the pile diameter, The diameter of the pile cannot be guaranteed; (3) The nozzle of the drill bit is not arranged in steps along the diameter of the pile, and the grouting in the cross section of the pile body is uneven, and mud may be trapped; (4) There is no inspection hole, and the inspection and maintenance of the drill bit is inconvenient

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