Offshore adjustable multi-leg jacket swivel pile foundation and its construction method

Abstract

The invention belongs to the technical field of offshore foundation structures, and discloses a multi-leg jacket swivel pile foundation that can be leveled at sea and a construction method thereof. The lower part of the jacket is connected with a plurality of annular tubes, and each annular tube is provided with a temporary fixing device. and water supply and drainage valves; each annular cylinder is connected with a swivel pile through the grouting of its inner cylinder. The swivel pile includes a pile body and a swivel bearing blade arranged on the outside of the pile body. The swirl bearing blade is used to screw into the foundation to provide main bearing capacity. The invention transforms the traditional guide frame construction into suction sinking and leveling operation, and transforms the traditional piling construction into swivel pile into the mud operation. At the same time, multiple annular tubes are used for precise positioning and underwater leveling, which can increase the bearing capacity of the foundation , to achieve precise leveling and improve construction efficiency.

Description

technical field [0001] The invention belongs to the technical field of offshore foundations, and in particular relates to an offshore levelable multi-leg jacket foundation and a construction method thereof. Background technique [0002] In the design and use of offshore multi-pile jacket foundation structures, the pile foundation plays a vital role. The load on the jacket is transmitted to the seabed through the pile foundation, thereby stabilizing the entire jacket platform. The current multi-pile jacket foundation structure and construction are generally in two forms: first, the steel pipe piles are driven in, and then the jacket is installed (pile first method); the jacket is installed first, and then the steel pipe piles are driven into each guide hole (back pile method). These two methods have certain requirements on the verticality of the pile body, the error of the pile top and the flatness of the seabed. At the same time, it is difficult to control the levelness of ...

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Problems solved by technology

[0003] The present invention focuses on solving the technical problems that the existing multi-pile jacket foundation structure pile foundation is difficult to construct and the jacket is easy to tilt and difficult to level, and provides a multi-leg jacket rotary pile foundation that can be leveled at sea and its construction method , can increase the bearing capacity of the foundation, achieve precise leveling, and improve construction efficiency

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