Offshore wind electricity single pile-wing plate-rockfill composite foundation and construction method thereof

Abstract

The invention discloses an offshore wind electricity single pile-wing plate-rockfill composite foundation and a construction method thereof. The foundation comprises a single pile, a wing plate and rockfill, the wing plate is of a conical structure, and is welded to the outer wall of a pile body, the rockfill is formed through dense stacking of the rockfill, the upper end of the wing plate is located in the rockfill, and the lower end of a pile wing is located on a seabed supporting layer. The construction method of the offshore wind electricity single pile-wing plate-rockfill composite foundation comprises the following steps of S1, determining the sizes of the single pile, the wing plate and the rockfill; S2, driving the single pile with the wing plate by the designed anchorage depth; and S3, stacking the rockfill on a seabed nearby the single pile. The problems of the low single pile bearing force, the large pile wing of the wing plate pile, serious foundation washing and the like can be solved, the single pile, wing plate and rockfill combination structure uses pile periphery soil resistance and rockfill friction force, the pile foundation bearing force can be improved, the pile foundation horizontal displacement can be reduced, the wing plate size is reduced, a wing plate stress mechanism is changed, washing of waves and ocean currents to seabed soil can be blocked, and safe and stable running of an offshore wind generation set can be ensured.

Description

technical field [0001] The invention belongs to the technical field of offshore wind power, and relates to an offshore wind power single pile-wing plate-rockfill composite foundation and a construction method thereof. Background technique [0002] Offshore wind power, as a clean energy source, has the characteristics of high wind speed, stable wind speed and large unit capacity, and is in a period of rapid development. At present, the type of offshore wind turbine foundation is mainly single pile foundation. The monopile foundation has the advantages of strong adaptability to terrain conditions, fast construction speed, and low construction cost. [0003] During the operation of offshore wind turbines, the single pile foundation not only bears the vertical load generated by the self-weight of the wind turbine unit and the pile foundation, but also bears the horizontal loads generated by wind, breaking waves, ocean currents and sea ice. Under the action of horizontal cyclic ...

AI Technical Summary

Problems solved by technology

Increasing the pile diameter and pile length means that the single pile production cost increases and the construction difficulty increases

In addition, for some deep-water and shallow seabeds in my country, even if the pile length and pile diameter are increased, the horizontal bearing capacity of the pile foundation cannot be met, and rock-socketed pile construction is still required. However, the construction of rock-socketed piles is more difficult and the construction speed Slow, it will further increase the construction cost of offshore wind farms

In addition, due to the installation of large-diameter monopile foundations on the seabed, waves and currents will generate eddies around the piles, scouring the seabed soil near the monopile foundations, and affecting the safe and stable operation of the wind turbine.

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