Non soil taking hole guiding process for sinking prestressed pipe pile or prefabricated square pile

Abstract

The invention relates to a non soil taking hole guiding process for sinking a prestressed pipe pile or a prefabricated square pile, which mainly comprises that: a liquid spray pipe is pre-buried or pre-placed in the prestressed pipe pile or the prefabricated square pile, liquid enters the outside wall of a pile end through the liquid spray pipe during pile sinking, a soil body on the outside wall of the pile end is sprayed at high pressure, and a water film is formed between the outside wall of the pile end and the soil body. The method for high-pressure jet grouting or water injection only destroys a structure of soil near the pile side in a small range by means of the cleavage function of injection water, quickly weakens the construction squeezing effect in a short time, can fully recover the frictional resistance of the soil body along with the drainage and consolidation of the soil body at the pile side, and does not influence the long-term bearing capacity of engineering piles.

Description

technical field [0001] The invention relates to a pile sinking process for prestressed pipe piles or prefabricated square piles without soil-borrowing holes. Background technique [0002] The pile sinking depth of traditional pile sinking methods of prestressed tubular piles or prefabricated square piles (including hammer pile sinking, static pressure pile holding pressure and preloading pile sinking) is often limited by the compression properties of the pressed soil Generally, it is only suitable for silty soil with high compressibility (compression coefficient greater than 0.5MPa), while the traditional pile sinking method for silty clay, silt fine sand layer and gravel layer with medium and low compressibility is It is difficult to sink the pile end to a predetermined depth, which greatly limits the applicability of prestressed pipe piles or prefabricated square piles. Now there is a method of pre-drilling and taking soil and piles to solve the above problems. The method...

AI Technical Summary

Problems solved by technology

This method solves the difficulty of pile sinking in medium and low compressibility soils, and reduces the soil squeezing effect in the pile pressing process, but also has disadvantages: 1. The drilling machine is relatively heavy, and it is laborious to transport and install to the construction site. It is easy to cause ground subsidence, walking is difficult, and pile position deviation is not easy to detect; 2. The cost of construction machinery is high. 3. The drilling machine is easy to pollute the environment after taking soil to the ground

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