Soil-squeezing hole-forming and pile-forming method for threaded pile

Abstract

The invention relates to a soil-squeezing hole-forming and pile-forming method for a threaded pile. A soil squeezing drilling tool with a spiral soil squeezing body is utilized, and the method comprises the following steps that in a soil squeezing hole forming process, a soil body uploading channel is narrowed through the spiral soil squeezing body, normal uploading of a soil body is hindered, part of retention is formed, and the retained soil body is forced to fill a groove in the pile hole wall; in the pile forming process, the upper interface of concrete in a pile body hole is always kept 1.0-1.3 m higher than the bottom end of a soil squeezing drilling tool in the drill lifting and concrete pouring process, a diameter expanding block buried in the concrete is squeezed into a spiral groove in the pile hole wall, the spiral groove is opposite to the drilling rotation direction, and concrete is poured into the groove and the column body pile body hole together. And the rotating soil squeezing drilling tool and the pressure grouting concrete continue to be lifted till the pile top elevation is reached. The method has the advantages that the threaded holes are formed through soil squeezing reasonably, and the bearing capacity of the pile formed through pressure irrigation is higher.

Description

technical field [0001] The invention belongs to the technical field of building pile construction, and particularly relates to a threaded pile extruding soil to form a hole and a pile forming method. Background technique [0002] Threaded piles have strong advantages in cast-in-place concrete piles. It converts the soil-pile friction due to the stress between the traditional pile and soil into the shear between soil and soil, and increases the lateral resistance of the pile by 1.3-2.0 times, and contributed to the promotion of energy-saving and emission-reduction building pile foundations. In the existing threaded pile construction, threaded drilling tools with equal pitch are used, and high-torque power head pile drivers are used to achieve through synchronous control technology. Due to the influence of various factors such as control technology accuracy and geological conditions, the bearing capacity of threaded piles formed by construction fluctuates greatly, especially ...

AI Technical Summary

Problems solved by technology

In the existing threaded pile construction, threaded drilling tools with equal pitch are used, and the power head pile driver with high torque is used to realize it through synchronous control technology. Due to the processing and manufacturing accuracy of threaded drilling tools, the rated output torque of Controlling the influence of various factors such as technical precision and geological conditions, the bearing capacity of threaded piles formed by construction fluctuates greatly, especially the soil around piles with complex geological conditions, such as containing hard interlayers, the fluctuations are more obvious. The main reason is that When the soil is squeezed into a threaded hole, the soil between the threaded teeth and the surrounding soil will be disturbed, and then the pile will be formed by reverse synchronous lifting and filling, and the shear capacity of the pile surrounding the soil will be reduced.

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