Drilling device for drilled grouting pile

Abstract

The invention discloses a drilling device for a drilled grouting pile. The drilling device comprises a hollow drill rod, a trapezoidal reaming rack and a drill bit, wherein a hollow screw is arrangedat the upper end of the drill bit; internal threads are arranged at the lower end of the hollow drill rod; external threads of the hollow screw are matched with the internal threads of the hollow drill bit; the drill bit is screwed at the lower end of the hollow drill bit; the trapezoidal reaming rack is of a structure with a large upper end and a small lower end and fixedly sleeves the hollow drill bit above the drill bit; a plurality of tilt blades are arranged on the inclined plane of the trapezoidal reaming rack in the height direction of the inclined plane; a spray head is arranged on theinclined plane between two adjacent tilt blades; an infusion chamber communicated with the spray heads is arranged inside the trapezoidal reaming rack; a drill rod side hole communicated with the infusion chamber is formed in the side wall of the hollow drill rod. According to the drilling device disclosed by the invention, the drill bit is in threaded connection with the hollow drill rod, so asto facilitate disassembly and assembly; the trapezoidal reaming rack is arranged, and the tilt blades and the spray heads are arranged on the incline plane of the trapezoidal reaming rack, so that reaming and flushing can be simultaneously realized, and reaming efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of bored piles, and mainly relates to a drilling device for bored piles. Background technique [0002] Cast-in-situ pile refers to the pile hole formed in the foundation soil by means of mechanical drilling, steel pipe extrusion or manual excavation at the project site, and a pile made by placing a steel cage and pouring concrete in it. According to different hole-forming methods, Cast-in-situ piles can be divided into several categories such as immersed pipe piles, bored piles and bored piles. Bored piles are widely used in highways, bridges and other engineering fields because of their strong adaptability, moderate cost, and simple construction. However, the existing bored piles need to be drilled and then reamed, the device structure is complex, the process is cumbersome, and the drilling deviation is prone to occur during the drilling process, which affects the construction quality. Contents of the in...

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Problems solved by technology

However, the existing bored piles need to be drilled first and then reamed. The structure of the device is complicated, the process is cumbersome, and the drilling deviation is prone to occur during the drilling process, which affects the construction quality.

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