A friction pile and its construction method

Abstract

The invention relates to the technical field of architectural engineering, and especially relates to a friction pile and a construction method thereof, in particular to a large-diameter super-long friction pile capable of fully achieving friction force of an upper side and a lower side of a foundation pile and end resistance of the foundation pile. The friction pile comprises an upper pile body, a lower pile body and a separation formwork arranged between the upper pile body and the lower pile body. An annular bevel body is arranged at the bottom of the upper pile body, and the lower pile body comprises a force transferring structural segment, a variable-section structural segment and a bearing structural segment which are sequentially connected from top to bottom. The upper pile body is arranged outside the force transferring structural segment in a sleeving mode, the bottom of a reinforcement cage of the upper pile body matches the variable-section structural segment, and the separation formwork is arranged between the upper pile body and the force transferring structural segment. On the premise that the settling volume at the top of the pile meets the deformation requirement of an upper structure, the bearing performance of whole-pile-length side friction force and pile end resistance can be fully achieved, and therefore the overall bearing capacity of the friction pile is improved; under the same upper loads, the needed pile length or pile diameter is smaller, settlement deformation of the pile top can be effectively controlled, and then engineering cost is reduced.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to a friction pile and a construction method thereof, in particular to a large-diameter super-long friction pile that can fully utilize the side friction resistance and end resistance of the upper and lower parts of the foundation pile. Background technique [0002] With the construction of large-scale projects such as high-rise, super-high-rise and long-span bridges, large-diameter super-long foundation piles are widely used as the foundation of such projects because of their advantages such as high bearing capacity and small deformation. According to the "Technical Specifications for Building Foundation Pile" (JGJ 94-2008), large-diameter super-long foundation piles must meet the following conditions: D≥800mm, L≥50m, L / D≥50, D is the diameter of the foundation pile, and L is the foundation pile total length. At present, a large number of existing theoretical stud...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to solve the problem that the large-diameter and super-long pile foundation designed by the existing analysis method cannot fully exert its bearing capacity and cause waste of construction costs, and the pile foundation caused by the existing pile foundation integrated design method The upper and lower side friction resistance of the foundation itself and the side friction resistance and the end resistance are not synchronized, which causes the problem that the upper part of the pile foundation reaches the bearing limit and the lower part of the pile does not fully exert its bearing capacity.

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