A pile-forming method for hole-protected special-shaped piles by freezing method

Abstract

The invention provides a freezing process hole protecting special-shaped pile forming method. The method mainly comprises the following steps: 1) manufacturing a prefabricated reinforced concrete pile tip, wherein a steel member is embedded in the pile tip and the diameter of the top surface of the pile tip is equal to the diameter of a special-shaped pile casing; 2) manufacturing a special-shaped pile mold, wherein a reversely arched curved plate is welded with a center spacer to form the special-shaped pile casing; a triangular freezing pipe is welded with the center spacer and a circular freezing pipe is welded in the center of a reversely arched curved surface of the reversely arched curved plate; a liquid supply pipe stretches into the triangular freezing pipe and is welded with the bottom of the triangular freezing pipe; 3) arranging a special-shaped pile driving machine in place, connecting the special-shaped pile mold with the prefabricated reinforced concrete pile tip and driving the special-shaped pile mold and the prefabricated reinforced concrete pile tip into a foundation; 4) filling liquid nitrogen into the liquid supply pipe and the circular freezing pipe to freeze surrounding soil by heat absorption through evaporation of the liquid nitrogen. The freezing process hole protecting special-shaped pile forming method has the advantages that the section area of the pile body is small and the side surface area of the pile is large; by using the liquid nitrogen to freeze the high-water-content and high-viscosity soil around the pile, the soil is solidified and formed, the squeezing force to the pile body is reduced and the quality of the pile body is guaranteed.

Description

technical field [0001] The invention relates to a method for forming piles, in particular to a method for forming piles of special-shaped piles protected by freezing method. Background technique [0002] Most of the traditional cast-in-situ piles are circular cross-section piles. The round piles are easy to construct, have strong adaptability and stable quality, and have been widely used. However, circular piles use a large amount of concrete and are not cost-effective. In recent years, special-shaped cross-section piles have emerged, such as Y-shaped cross-section piles, X-shaped cross-section piles, and H-shaped cross-section piles. Compared with the traditional circular pile, the special-shaped pile has a larger pile circumference under the same amount of concrete, thus generating greater side friction resistance, greatly improving the bearing capacity of the pile foundation, saving concrete materials, and adapting to the pile base development needs. [0003] The curre...

AI Technical Summary

Problems solved by technology

The problem of this kind of special-shaped cross-section immersed pipe grouting pile is that the construction quality is not easy to control, and the process of pulling out the pipe will easily cause the necking of the pile body, or the designed special-shaped cross-section cannot be formed at all; Oblique fracture or even dislocation due to the effect of soil extrusion, these problems seriously hinder the development of special-shaped piles

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