A prefabricated concrete triangular extruded and expanded support plate pile and its construction method

Abstract

The invention discloses a precast concrete triangular squeezed branch pile which comprises a pile body, a pile cap, stiffeners, triangular supporting discs and a pile tip expanding bottom; the pile body is a triangular equal section pile body; the pile cap is arranged at the end part of a pile top; the pile tip expanding bottom is an expansive concrete expanding bottom; the stiffeners are arrangedat the junctions of the pile cap, the pile tip expanding bottom and the pile body respectively; and the triangular supporting discs are arranged on the three surfaces of the outer wall of the pile body respectively and at 1 / 3 of the upper part of the pile body in length. Compared with the prior art, by adopting the precast concrete triangular squeezed branch pile provided by the invention, a partof soil body is squeezed toward the hole wall to improve the pile lateral friction resistance; the supporting discs are arranged at 1 / 3 of the pile body in the length and accord with the soil body stress diffusion rule, so that the effective area of the pile body is increased, the pile-soil contact surface is expanded, and the pile-foundation bearing capacity is improved; expansive concrete is pressed into through a pile tip expanding hole to form a pre-pressure at the pile tip, and the pile tip resistance is improved; and by combining the pile body with the advantages of an end-bearing pileand a friction pile, hard stratums at the upper portion and the lower portion of the pile body can be fully utilized, sedimentation is effectively controlled, and sedimentation of the pile body is relatively small.

Description

technical field [0001] The invention relates to the fields of geotechnical engineering and geological engineering, in particular to a prefabricated concrete triangular extruded and expanded support plate pile and a construction method thereof. Background technique [0002] After the pile foundation of the high-speed railway bridge is worked, it will be subjected to the load from the superstructure such as the bridge, and the settlement will directly affect the stability and safe operation of the high-speed railway line. The quality of its settlement control effect even determines to some extent The success or failure of high-speed railway construction. Especially the post-construction settlement of deep soft soil pile foundation. The reason for the large settlement is that the pile body cannot provide enough pile side resistance and pile end resistance, and the pile body cannot make full use of the bearing capacity of each soil layer, resulting in a large pile body settleme...

AI Technical Summary

Problems solved by technology

[0004] Purpose of the invention: The purpose of the invention is to provide a prefabricated concrete triangular extruded and expanded support plate pile and its construction method to solve the technical problems of insufficient single pile bearing capacity and excessive pile settlement in soft soil areas

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