Hole forming device and construction method of bored pile in soft ground

Abstract

The invention provides a bore forming device of a soft soil stratum cast-in-situ bored pile and a construction method thereof. The bore forming device comprises a slag barrel, a drill pipe which is inserted in the slag barrel and can move in the axial direction of the slag barrel, and a driving motor used for driving the drill pipe to rotate in the circumferential direction of the drill pipe. A cutting part used for being cut into a bore to-be-formed position in a soft soil stratum is arranged at the bottom of the slag barrel, and the drill pipe and the slag barrel are coaxially arranged. A spiral bit is coaxially connected to the bottom end of the drill pipe, the outer diameter of the spiral bit is matched with the inner diameter of the slag barrel, the spiral bit rotates in the circumferential direction under driving of the drill pipe. According to the bore forming device, bore forming construction of the soft soil stratum cast-in-situ can be quickly achieved, meanwhile, the disturbance to a bore wall soil layer is small, and the phenomena of bore collapse and chambering are effectively avoided.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a hole-forming device for bored piles in soft ground and a construction method thereof. Background technique [0002] The soft ground has the characteristics of high water content, high compressibility, low strength, low permeability, etc. In the existing construction, the reverse circulation rotary drilling machine is often used to construct the bored piles on the soft ground. During the process, it is easy to cause hole collapse and hole expansion, the quality of the hole formation is difficult to guarantee, and the hole formation efficiency is low. Therefore, it is necessary to design a hole-forming device to minimize the disturbance of the hole wall soil during the hole-forming process and avoid the collapse of the hole wall. Contents of the invention [0003] In view of the foregoing, the present invention provides a hole-forming device for bored piles in soft ground ...

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Problems solved by technology

[0002] The soft ground has the characteristics of high water content, high compressibility, low strength, low permeability, etc. In the existing construction, the reverse circulation rotary drilling machine is often used to construct the bored piles on the soft ground. During the process, it is easy to cause hole collapse and hole expansion, the quality of the hole is difficult to guarantee, and the hole-forming efficiency is low

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