Bored under-reamed filling pile and fabricating method therefor

Abstract

The invention discloses a bottom enlarged cast-in-place pile with dilled hole, wherein: the cast-in-place pile is arranged with an enlarged footing on the bottom. The enlarged footing of the invention formed by mechanical pressure and enlarged base drill bit enlarges the loaded area of the pile end and can provide more than two over three pulling-resistant force of the whole pile. The invention can satisfy the engineering demand of pulling-resistant load bearing, reduce the length and number of pile, simplify the construction and reduce cost.

Description

Technical field: [0001] The invention relates to the technical field of large-scale civil construction materials in the aspect of anti-floating and anti-tension of structures in engineering, in particular to a bored bottom-expanding cast-in-place pile and a manufacturing method thereof. Background technique: [0002] The underground water table in Shanghai area is relatively high, and the anti-floating of underground structures is often one of the important issues in underground engineering design. The commonly used solution in the past is to use straight-hole uplift piles to provide uplift resistance. This is currently recognized as one of the most reliable methods. However, due to the poor geology in Shanghai, which is a soft soil foundation, ordinary straight-hole drilling and grouting Pile can only rely on peripheral frictional resistance to provide uplift bearing capacity, the pile body to be used is generally longer, the number of piles is large, and the investment is ...

AI Technical Summary

Problems solved by technology

The commonly used solution in the past is to use straight-hole uplift piles to provide uplift resistance. This is currently recognized as one of the most reliable methods. However, due to the poor geology in Shanghai, which is a soft soil foundation, ordinary straight-hole drilling and grouting Pile can only rely on peripheral frictional resistance to provide uplift bearing capacity, the pile body to be used is generally longer, the number of piles is large, and the investment is large

In addition, combined with different foundation design requirements, there are also various pile types in the project, such as rammed gravel concrete pouring piles at the bottom of holes, rammed and expanded compacted cement-soil piles, post-grouting at the bottom of bored piles, artificial bottom expansion grouting Pile and large-diameter manual excavation pile, etc., but these pile types also have the disadvantages of poor uplift bearing capacity, large investment, troublesome construction, and long construction period. With the development of underground engineering construction in Shanghai, underground engineering The requirements for the uplift resistance of pile foundations are increasing day by day, and investors and construction parties are eager to provide a type of uplift pile with less investment, superior uplift performance and easy construction.

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