Construction method of composite pile foundation

Abstract

The invention relates to a construction method of a composite pile foundation. The method comprises following steps: firstly, a rotary jetting rig is used for constructing cement soil stirring piles, and according to the soil conditions, cement powder or cement slurry is selectively sprayed; secondly, a steel protection cylinder is used for carrying out extrusion and expanding on the central positions of the cement soil stirring piles to form pipe pile holes; thirdly, pipe piles with annular steel pile tips sink into the pile holes through static pressure of hammering of pile sinking casing pipes arranged in the pile piles and reach the design position; fourthly, the pile sinking casing pipes are pulled out for pile forming. The pile foundation constructed through the method is high in reliability, and small in influence on surrounding. Meanwhile, under the littoral environment, the cement soil stirring piles easily lose durability under the sea water effect, a detection device and a reinforcing device are added on the basis of pile foundation design, and durability of the pile foundation is effectively improved.

Description

technical field [0001] The invention relates to a construction method of a composite pile foundation, in particular to a construction method of a composite pile foundation in a silt environment. Background technique [0002] At present, when pile foundation construction is carried out in the muddy soil environment along the coast, along the river and along the lake, the pile method of mixing cement and soil is often used for construction. The cement-soil mixing pile uses cement as a curing agent, and through a mixing machine, the soft soil and the curing agent are forcibly stirred deep in the foundation, and a series of physical and chemical reactions between the curing agent and the soft soil are used to harden the soft soil Form a high-quality foundation with integrity, water stability and certain strength. [0003] The basic principle of cement-strengthened soil is based on the physical and chemical reaction process of cement-strengthened soil. It is different from the h...

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Problems solved by technology

[0005] However, due to the cement-soil material itself, its bearing capacity is limited to a certain extent, and its durability is not as good as other pile types. The strength meets the requirements during construction, but as time goes by, it is especially affected by the sulfate ions, Influenced by magnesium ions and calcium ions, etc., its strength will be greatly reduced over time, which will bring hidden dangers to the engineering on the pile foundation

[0006] However, the use of traditional pipe piles as pile foundations for silt soil construction projects cannot provide good grip and protection for pipe piles due to the limited strength of the soil around the piles; Miscellaneous fill, with high strength, is easy to cause damage to the pipe pile when sinking the pile, making it difficult to guarantee the construction quality of the pipe pile

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