Full casing pipe soil taking vibration construction method for squeezed and expanded cast-in-place pile

Abstract

A full casing pipe soil taking vibration construction method for a squeezed and expanded cast-in-place pile includes the steps that a steel casing pipe is sunk to the design elevation by a high-frequency vibration hammer through a clamper; soil is taken mechanically or manually; a special hole expander is put in the pipe for vibration hole expansion; concrete is poured into the special hole expander, and vibration hole expansion and concrete pouring are repeatedly performed; a steel reinforcement cage is lifted and put, and concrete is poured into the steel reinforcement cage; the steel casing pipe is pulled out in a vibrating mode to form the squeezed and expanded cast-in-place pile. As the fill concrete is poured while the special hole expander is used for vibration squeezing and expanding, foundation soil of the bottom expanding part can be more compact, a formed expanding head can substantially increase the end resistance of the pile, and the vertical bearing capacity of the pile is improved substantially; when the same vertical load is borne by a single pile, the needed pile length is small, the usage amount of the concrete is small, and the foundation project cost can be substantially reduced.

Description

technical field [0001] The invention belongs to the field of engineering construction, and in particular relates to a construction method of full-sleeved soil-taking vibration squeezed and expanded cast-in-situ piles. Background technique [0002] Immersed tube cast-in-situ pile is a product of the 1930s. Due to many quality problems of this pile type, it was gradually eliminated after the 1980s and replaced by hammer sinking tube rammed and expanded piles. Although the pile has the advantage of bearing capacity, coupled with the pressure of the rammed tube on the pile top to the concrete inside the tube, it will play a certain role in preventing the pile from breaking and segregating, but because the tube is not pulled out by vibration, the tube is hammered and sunk. Rammed and expanded piles still cannot solve the problem of pile body quality when they are constructed in coastal soft soil areas, so they have gradually been eliminated after entering the 21st century. [00...

AI Technical Summary

Problems solved by technology

[0002] Immersed tube cast-in-situ pile is a product of the 1930s. Due to many quality problems of this pile type, it was gradually eliminated after the 1980s and replaced by hammer sinking tube rammed and expanded piles. Although the pile has the advantage of bearing capacity, coupled with the pressure of the rammed tube on the pile top to the concrete inside the tube, it will play a certain role in preventing the pile from breaking and segregating, but because the tube is not pulled out by vibration, the tube is hammered and sunk. Rammed and expanded piles still cannot solve the quality problems of the pile body during construction in coastal soft soil areas, so they have gradually been eliminated after entering the 21st century

[0003] In the prior art, when the project has a large requirement on the bearing capacity of the pile body, the existing cast-in-situ piles have the problem of insufficient bearing capacity of the pile body

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