Construction method for enhancing overall stress performance of PHC pipe pile

Abstract

The invention discloses a construction method for enhancing overall stress performance of a PHC pipe pile. The construction method mainly comprises the following construction steps that S1, a construction site is leveled, and the PHC pipe pile is driven into or pressed into a foundation soil layer to a preset depth through a pile driver or a static press; S2, a drill bit of a drilling machine is aligned to the center position of the PHC pipe pile, and drilling is conducted till the drill bit exceeds the bottom end of the PHC pipe pile by several meters; S3, a drill rod is lifted to carry rotary guniting to the bottom end of the PHC pipe pile, and slurry spraying is stopped; S4, secondary guniting is conducted, specifically, after rotary guniting exceeds the bottom end of the PHC pipe pileby several meters, the drill rod is lifted out of the pipe pile; and S5, a prefabricated reinforcement cage is lowered to the preset position of the bottom end of the PHC pipe pile from the center ofthe pipe pile, and concrete is poured to the pile top through a PHC pipe pile core. The construction method is easy and convenient to operate, mature and safe in process and good in pile end soil bodyreinforcing effect, the bearing capacity of the PHC tubular pile can be effectively improved, and settlement deformation is reduced.

Description

technical field [0001] The invention relates to the field of foundation construction, in particular to a construction method for enhancing the overall mechanical performance of PHC pipe piles. Background technique [0002] With the increasing development of the economy, more and more super high-rise buildings have sprung up in the field of engineering. With the increasing height and volume of the main structure, the requirements for the bearing capacity of the foundation are also getting higher and higher. Among them, PHC pipe piles have many advantages such as high strength, simple construction, material saving, small deformation, and stable quality. Due to the above-mentioned good mechanical properties and economic and technical indicators, they are widely used in the field of building foundations. [0003] At present, the PHC pipe piles used in the field of construction pile foundation in my country generally rely on the frictional resistance of the soil layer on the side...

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Problems solved by technology

[0006] The invention provides a PHC pipe pile construction method, which solves the problems in the prior art such as environmental pollution, unstable shape of the expanding head, great damage to the PHC pipe pile body, tilted pile body, low construction efficiency and difficulty in ensuring construction quality, etc. question

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