Hydraulic adjustable type drill bit device for pile foundation expanding hole forming and construction method of hydraulic adjustable type drill bit device

Abstract

The invention provides a hydraulic adjustable type drill bit device for pile foundation expanding hole forming and a construction method of the hydraulic adjustable type drill bit device. The hydraulic adjustable type drill bit device comprises a drill rod and a straight pile drill bit. An oil cylinder, a piston rod, an upper sliding seat and a lower sliding seat are arranged in the drill rod. The upper sliding seat is connected with the upper end of the piston rod. The lower sliding seat is connected with the lower end of the piston rod in an embedded mode, and the upper sliding seat and the lower sliding seat are slidably connected to the inner wall of the oil cylinder. The hydraulic adjustable type drill bit device further comprises a cutting drill bit. The cutting drill bit comprises a cutting arm, an adjusting arm and a connection arm. The lower end of the connection arm is hinged to the lower sliding seat. The upper end of the connection arm is hinged to one end of the adjusting arm. The other end of the adjusting arm is hinged to the upper end of the cutting arm, and the hinged point of the adjusting arm and the cutting arm is fixed relative to the drill rod. The hydraulic adjustable type drill bit device for pile foundation expanding hole forming and the construction method of the hydraulic adjustable type drill bit device have the beneficial effects that under the circumstance that expanding drill bit equipment is not used, the motion of pile foundation hole broadening can be completed, the advantages that time of repeated installation and time of disassembly of a large drill bit are saved are achieved, the structure is simple, manufacturing is convenient, and the cost is low.

Description

technical field [0001] The invention belongs to the field of underground engineering, and in particular relates to a hydraulically adjustable drill bit device and a construction method for expanding the diameter of pile foundations and forming holes. Background technique [0002] Reaming of mechanically drilled cast-in-place piles can increase the bearing capacity of single piles, but the use of mechanical expansion heads for construction requires expensive equipment and high cost; the construction quality cannot be guaranteed by repeated rotary excavation to extract mud and slag, and it is difficult to inspect and accept reaming on site . Contents of the invention [0003] In view of this, the present invention aims to propose a hydraulically adjustable drill device and a construction method for expanding the diameter of the pile foundation and its construction method, which can complete the action of widening the pile foundation hole without using the expanding drill dev...

AI Technical Summary

Problems solved by technology

[0002] Reaming of mechanically drilled cast-in-place piles can improve the bearing capacity of single piles, but the use of mechanical expansion heads for construction requires expensive equipment and high cost; the construction quality cannot be guaranteed by repeated rotary excavation to extract mud and slag, and it is difficult to inspect and accept reaming on site

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