Construction process of pressing-and-embedding special-shaped cast-in-place pile and equipment thereof

Abstract

The invention discloses a construction process of a pressing-and-embedding special-shaped cast-in-place pile. In the construction process, a pile head is pressed into stratum by a guide rod to a preset depth in a vibrating or static pressure manner, concrete is cast in a bore while pressing during the pressing process, and a concrete surface is maintained at a set height; pressing is stopped whenthe pile head is pressed to the preset depth, the pile head is rotated for a certain angle through the guide rod, high-pressure concrete slurry is jetted from a side nozzle of a swivel head during rotating, so that a complete disc-shaped expanded bore pile is formed at a pile bottom; and then the pile head is lifted out through the guide rod, all branches of the pile head shrink downwards during the lifting process of the pile head, thereby the concrete in the bore can be prevented from being affected. When bore forming is finished, the plain concrete pile body can be directly used as a composite foundation according to specific design requirements; when the plain concrete pile body needs to be used as a reinforced concrete pile, a reinforcement cage of a shape corresponding to the section shape of the pile body is manufactured according to the section shape of the pile body and is pressed in the pile body to form a reinforced concrete cast-in-place pile. The invention also discloses equipment used in the process.

Description

technical field [0001] The invention relates to a construction technology of cast-in-situ piles, in particular to a construction technology and equipment for pressing and embedding special-shaped cast-in-situ piles. Background technique [0002] In foundation engineering, cast-in-situ pile is a widely used form of pile foundation. It has the characteristics of no noise, no vibration, etc., and has little impact on the environment, and can form piles such as large-diameter and super-long piles. The above These advantages make cast-in-situ piles generally optimistic about the development prospects in engineering. [0003] The pile-forming techniques commonly used at the present stage include mud-walled cast-in-place piles, rotary-dug bored piles, impact-holed cast-in-place piles, long auger drilled grouted piles, and post-grouting construction techniques. This type of pile body is a circular pile body, and its bearing capacity is mainly provided by pile side friction resistan...

AI Technical Summary

Problems solved by technology

This type of pile is a circular pile, and its bearing capacity is mainly provided by pile side friction and pile end resistance, resulting in a large amount of concrete and high construction costs.

It has considerable limitations when there are special requirements for the horizontal bearing capacity and uplift bearing capacity of the pile foundation

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