A construction method for enhancing the overall mechanical performance of PHC pipe piles

Abstract

A construction method for enhancing the overall mechanical performance of PHC pipe piles, mainly comprising the following construction steps: step 1, leveling the construction site, driving or pressing the PHC pipe piles into the foundation soil layer to a predetermined depth with a pile driver or a static press ; Step 2, make the drill bit align the center position of the PHC pipe pile, drill to a few meters beyond the bottom end of the PHC pipe pile; Step 3, lift the rotary shotcrete of the drill pipe to the bottom end of the PHC pipe pile, stop the shotcrete; Step 4 , Secondary shotcrete, rotate shotcrete to a few meters beyond the bottom end of the PHC pipe pile and then lift the drill pipe out of the pipe pile; Step 5. Lower the prefabricated steel cage from the center of the pipe pile to the predetermined position at the bottom end of the PHC pipe pile ; Pour concrete to the top of the pile through the PHC pipe pile core. The construction method has the advantages of simple operation, mature technology, safety and good soil reinforcement effect at the pile end, which can effectively improve the bearing capacity of the PHC pipe pile and reduce the settlement deformation.

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 a PHC pipe pile. Background technique [0002] With the increasing economic development, in the engineering field, more and more super high-rise buildings are rising from the ground. 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 building pile foundations in my country generally rely on the frictional resistance of the soil layer on the si...

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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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