Prestress cement mixing pile and construction method thereof

Abstract

The invention belongs to a prestress cement mixing pile and a construction method thereof. A circumferential wall of a pile body of the prestress cement mixing pile is provided with an irregular protrusion, wherein the protrusion is formed in a manner that pressurized injected increased mortar extrudes clay on the periphery of the wall of a bored pile and is integrally connected with the pile body, and prestressed steel bars are arranged in the pile body. The construction method comprises the steps that pressure is increased segment by segment to inject the increased mortar, when a drill bit for spraying the mortar and conducting stirring of a drill rod is lifted to the height where the length of a pile hole in the lower end of the drill bit accounts for 1/n of the whole length of the pile hole, drill rod lifting is stopped, a pressurizing mortar pump continues to go downwards, the increased mortar is injected into the pile hole in the lower segment of a mortar outlet of a stirring head, and the increased mortar form the irregular protrusion. The prestress cement mixing pile has the beneficial effects that the contact area of the pile body and a foundation soil layer is large, the abrasion coefficient is large, the transverse corresponding nature is high, the pile body strength is high, the load on the upper portion of the pile can be effectively transferred into deep foundation soil, the bearing force is large, the method is simple and practical, and the use effect is good.

Description

technical field [0001] The invention belongs to a prestressed cement-soil mixing pile and a construction method thereof. Background technique [0002] The cement-soil mixing pile is a method for reinforcing the low foundation of saturated soft clay. It uses cement as the curing agent, and through a special mixing machine, the soft soil and the curing agent are forced to mix deep in the foundation. A series of physical and chemical reactions between them make the soft soil harden into a high-quality foundation with integrity, water stability and certain strength. [0003] The construction method of the existing cement-soil mixing pile is as follows: After the pile position is fixed, the pile mixer is moved to the designated pile location, the grout is mixed in advance before drilling, and the cement slurry is mixed in the background at the same time as the deep mixer is pre-stirred and sinking. Put the slurry into the collecting hopper; stir and sink, start the turntable of ...

AI Technical Summary

Problems solved by technology

The strength of the cement-soil mixing pile is low. When the upper load increases, the side frictional resistance between the cement-soil mixing pile and the soil will increase within the effective pile length range of the upper part of the pile until shear failure occurs between the pile and the soil. ; and outside the effective pile length of the pile body, the joint deformation of the pile and soil makes it difficult to exert the lateral frictional resistance

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