A construction method for hole forming and side wall grouting of cast-in-situ piles for coral sand foundation

Abstract

The invention discloses a cast-in-place pile hole forming and side wall grouting construction method for a coral sand foundation. The method is characterized in that construction of hole forming of acast-in-place pile casing pipe is carried out by adopting a vibration and static pressure alternate operation method, pile side grouting is carried out while the steel casing pipe is pulled out, and specific construction comprises the steps of hole forming, hanging and placing a reinforcement cage, grouting the casing pipe, secondary hole cleaning, cast-in-place pile pouring, pulling out the steelcasing pipe, side wall grouting and the like. Compared with the prior art, the method has the advantages that the pile forming reliability and the pile foundation bearing capacity are high, the soilbody disturbance is effectively reduced, the particle crushing degree is reduced, the pile side friction resistance is improved, the problems of hole forming difficulty and low side resistance of thecoral sand foundation are well solved, the steel casing pipe can be recycled, the engineering cost is greatly reduced, and the method is green and environment-friendly, and has good environmental protection benefits and popularization prospects.

Description

technical field [0001] The invention relates to the technical field of pile foundation engineering, in particular to a construction method for forming holes and side wall grouting of cast-in-situ piles suitable for coral sand foundations. Background technique [0002] With the needs of national defense construction and the development and utilization of marine oil and gas, fishery, tourism and other resources, the number and scale of coral island and reef construction projects are increasing day by day, and the requirements for the carrying capacity of the foundation are getting higher and higher. Cast-in-situ piles, as a deep foundation with wide applicability on land, face great difficulties in the construction of islands and reefs. The main components of coral reef foundations are coral sand, reef limestone, calcareous soil, and coral clastic soil. Among them, coral sand (also known as calcareous sand) has loose particles, high porosity, large apparent friction angle, and...

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Problems solved by technology

[0004] The object of the present invention is to design a construction method for drilling holes and side wall grouting of cast-in-place piles for coral sand foundations in view of the deficiencies of the prior art, and adopt the method of alternating vibration and static pressure to carry out the steel casing of cast-in-place piles Hole-forming construction, the pile side grouting is carried out while the steel casing is pulled out, which can effectively reduce soil disturbance, reduce particle crushing degree, increase pile side friction resistance, and greatly improve hole wall stability and pile foundation bearing capacity. It solves the problems of sandy soil vibration density and slow penetration caused by the single vibration method, as well as the difficulty of forming holes and low side resistance in the coral sand foundation. The steel casing can be recycled, which greatly reduces the project cost. It is green, environmentally friendly, and Economical

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