Variable-diameter steel tube built pile capable of reducing negative friction

Abstract

A variable-diameter steel tube built pile capable of reducing negative friction comprises a large-diameter steel tube pile arranged in a soil bearing layer. The top end of the large-diameter steel tube pipe is in butt joint with a pile driving sleeve, a small-diameter steel tube pile is arranged in the pile driving sleeve, a quadrilateral rib plate connected with the inner wall of the large-diameter steel tube pile is fixed to the outer wall of the bottom of the small-diameter steel tube pile, a reducing sleeve is arranged at the periphery of the small-diameter steel tube pile, a reinforcing plate is arranged in the reducing sleeve, the reducing sleeve is arranged under the middle of a soft soil layer, an expanded top barrel is arranged at the periphery of the upper portion of the small-diameter steel tube pile through a partition plate, the top of the expanded top barrel is aligned at the soil surface, a reinforcing ring is arranged at the top end of the large-diameter steel tube pile, an enclosing and blocking part is arranged at the tail end of the outer side of the reinforcing ring, a large triangular rib plate is arranged at the bottom of the reinforcing ring, an upper bottom plate and a lower bottom plate are arranged on the inner wall of the bottom of the small-diameter steel tube pile, and a small triangular rib plate is arranged on the inner wall of the small-diameter steel tube pile. The variable-diameter steel tube built pile capable of reducing negative friction can effectively reduce negative friction and optimize pile foundation level and vertical bearing performance.

Description

technical field [0001] The invention relates to a variable-diameter steel pipe composite pile with reduced negative friction resistance, which belongs to the field of steel pipe pile foundations for construction. Background technique [0002] Pile foundation is a traditional foundation type, but there are still some problems that cannot be ignored in the use of pile foundation, such as the problem of negative friction resistance of pile foundation. When the pile body and the soil around the pile undergo relative displacement, frictional resistance will be generated on the side of the pile. In general, the pile settlement is greater than the soil settlement, and the frictional resistance is positive; for pile foundations passing through highly compressible soil layers, under the action of factors such as soil surface overload, the soil settlement is greater than the pile settlement, and the pile side negative friction will occur. resistance. Under the action of negative fri...

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Problems solved by technology

[0004] In order to solve the above existing problems, the present invention discloses a variable-diameter steel pipe composite pile that reduces negative frictional resistance. The problem of negative frictional resistance of steel pipe piles of buildings caused by piled load on the surface of the soil layer takes into account the optimization of the bearing performance of the pile foundation; at the same time, the invention can avoid damaging the environment and is more in line with the concept of environmental protection

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