A partially prefabricated friction pile and its construction method

Abstract

The invention relates to the technical field of architectural engineering, in particular to a partially-prefabricated friction pile and a construction method thereof. The partially-prefabricated 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. The upper pile body comprises a standard segment and a pile bottom segment. 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 standard segment and the pile bottom segment are both prefabricated prestressed reinforced concrete tubular piles. Standardized production of the friction pile is achieved, the labor intensity of construction personnel is lowered, and manufacturing cost is reduced. The upper pile body is arranged outside the force transferring structural segment in a sleeving mode. Due to the split design of the upper pile body and the lower pile body, the bearing performance of whole-pile-length pile side friction resistance and pile end resistance can be fully achieved, and the overall bearing capacity of the friction pile is improved. Under the action of identical upper loads, the needed pile length or pile diameter is smaller, settlement deformation of the pile top can be effectively controlled, then the engineering cost of the friction pile is reduced, and social resources are saved.

Description

technical field [0001] The invention relates to the technical field of construction engineering, in particular to a partially prefabricated friction pile and a construction method thereof, in particular to a large-diameter super-long friction pile capable of fully exerting the side friction resistance and pile end resistance of the upper and lower piles of foundation piles. 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...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to avoid the waste of construction cost due to the inability of the large-diameter and super-long foundation piles designed by the existing analysis method to fully exert their bearing performance, and the integrated design method of the existing foundation piles causes The frictional resistance between the upper and lower parts of the foundation pile itself and between the frictional resistance of the pile side and the resistance at the pile end are not synchronized, resulting in the situation that the upper part of the foundation pile reaches the limit value of the bearing capacity and the bearing capacity of the lower part has not yet fully exerted. At the same time, the existing Friction piles are limited to specific construction conditions, resulting in low efficiency in the construction process of friction piles, which is not conducive to the realization of standardized production, resulting in long construction periods and high construction costs

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