Pile foundation structure reinforced by single-pile foundation of offshore wind turbine generator set and construction method

Abstract

The invention relates to a pile foundation structure reinforced by a single-pile foundation of an offshore wind turbine generator set and a construction method, which comprises an offshore wind turbine generator set single pile foundation and at least three steel pipe piles which are circumferentially and uniformly distributed around the single-pile foundation, wherein at least one layer of combined beam system structure is arranged between the at least three steel pipe piles and the combine beam system structure comprises a central sleeve fixedly sleeving the outer side of the single pile foundation; the outer side of the central sleeve is provided with at least three skirt pile sleeves which are uniformly distributed in circumference and the positions of which are corresponding to the positions of steel pipe piles, the skirt pile sleeves are fixed on the outside of the steel pipe piles, combined beams are fixedly arranged between the skirt pile sleeves and the central sleeves, according to the invention, the structural design is reasonable, the horizontal bearing capacity and rigidity of the single-pile foundation and the integral stability of the structure can be improved, the investment cost is also reduced, the structure has universal applicability and wide application prospect in the field of ocean wind power.

Description

Technical field: [0001] The invention belongs to the technical field of foundation structures of offshore wind power generating sets, and in particular relates to a single pile foundation reinforcement pile foundation structure and a construction method of offshore wind power generating sets. Background technique: [0002] At present, the foundation types of wind turbines used in offshore wind farms at home and abroad are mainly four types: pile foundation, gravity foundation, suction cylinder foundation and floating foundation, among which pile foundation can be subdivided into single pile foundation, multi-pod foundation, jacket Foundations and high pile cap foundations. The single-pile foundation is mainly composed of a large-diameter steel pipe pile, and its length and embedding depth are jointly determined by the water depth, geological conditions and the load of the wind turbine. The monopile foundation has been widely used in foreign offshore wind farms because of it...

AI Technical Summary

Problems solved by technology

[0003] At present, the diameter of the largest single pile foundation in China is 7-7.5m. However, with the increase of the capacity of the wind turbine unit in the future, the load of the wind turbine unit will be further increased, and the diameter of the single pile foundation will reach 8-10m. Construction capacity of 10m pile foundation

According to the construction experience and statistics of offshore wind farms that have been built and are under construction, it is difficult to control the verticality of large-diameter single pile foundations. It is difficult to sink piles in place for geological conditions with shallow bedrock. Insufficiency such as low horizontal stiffness, large single pile diameter, etc.

These deficiencies directly or indirectly affect the construction quality and construction period of the single pile foundation, thereby increasing the investment cost of the project

With the implementation of the project, under complex marine geological conditions, the construction of offshore wind power single pile foundations may have problems such as difficulty in sinking piles in place, insufficient horizontal stiffness, and excessive verticality error of pile sinking.

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