Composite foundation structure applicable to offshore wind power plant fan and construction method

Abstract

The invention discloses a composite foundation structure applicable to an offshore wind power plant fan and a construction method. The composite foundation structure comprises a steel pipe pile, corefilling concrete and a plurality of pre-stressed anchor cables, wherein the bottom end of the steel pipe pile penetrates into a bearing layer of the offshore foundation; the core filing concrete is poured into the steel pipe pile and placed on the bearing layer; and the top ends of the pre-stressed anchor cables are anchored on the inner wall of the steel pipe pile, and the bottom ends penetrate through the core filling concrete and are embedded in a micro-weathered rock layer of the offshore foundation. According to the composite foundation structure formed by effectively combining the steelpipe pile, the core filling concrete and the pre-stressed anchor cables, and the parts cooperatively work to bear the vertical force, the horizontal force and the bending moment caused by the horizontal force of the upper and lower structure together, thereby ensuring the bearing capacity and stability requirements of the foundation structure on the one hand, and reducing the buried depth of the steel pipe pile and reducing the construction difficulty and the construction cost on the other hand.

Description

technical field [0001] The invention relates to the field of basic structure design of wind turbines in offshore wind farms, in particular to a composite foundation structure and construction method suitable for wind turbines in offshore wind farms. Background technique [0002] Utilizing clean wind energy resources is a strategic guideline for global energy development. my country's first 100MW East China Sea offshore wind farm was built in 2011. According to statistics, the basic cost of wind turbines accounts for about 20% to 30% of the total cost of wind farms, which is one of the reasons for the high cost of offshore wind farms. Therefore, it is the key to reduce the construction cost of offshore wind farms to select appropriate offshore wind power foundation types and reasonable construction schemes according to different water depths, geology and environmental conditions. [0003] At present, the foundation structure of wind turbines in offshore wind farms generally ...

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Problems solved by technology

Various forms of foundations need to be adopted according to different water depths and geological conditions. In the specific application of the above methods, the cost of fan foundations still accounts for a relatively high proportion

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