Offshore fan combination-type single pile foundation and construction method thereof

Abstract

The invention discloses an offshore fan combination-type single pile foundation and a construction method thereof. The offshore fan combination-type single pile foundation comprises a pile body, a pile wing and a gravity disc, the pile wing is located on the outer wall of the upper part of an anchoring section of the pile body, the gravity disc is located on the interface of a surrounding soil body of the pile body and seawater and is of a rigid structure, and the gravity disc and the pile body are fixedly connected or freely connected. The construction method of the combination-type single pile foundation comprises the following steps that S1, parameters of the pile body, the pile wing and the gravity disc are determined; S2, the pile body is driven to the designed anchoring depth throughpile sinking equipment; and S3, the gravity disc is hung on the mud-water interface near the pile body. Through the gravity disc, the pile surrounding soil body can be strengthened, the size of the pile wing can be decreased, stress of the pile wing can be improved, through the synergistic effect of a single pile, the pile wing and the gravity disc, the passive soil pressure and shearing resistance of the pile surrounding soil body can be fully mobilized, the horizontal carrying capacity of the pile foundation is improved, rotation and lateral displacement of the pile body are lowered, the bending moment of the pile body is reduced, then the diameter and the length of the pile body can be appropriately decreased, the construction cost is lowered, and the construction progress is accelerated.

Description

technical field [0001] The invention belongs to the technical field of offshore wind power, and relates to an offshore wind turbine combined single pile foundation and a construction method. 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. Due to the complex geological conditions near the shore, the construction technology of offshore wind power is difficult and the construction cost is high. According to statistics, the basic cost of offshore wind turbines accounts for 15% to 25% of the total cost of offshore wind farms. At present, the basic types of offshore wind turbine foundations can be divided into gravity type, single pile type, suction cylinder type, three pile type, jacket type and floating type according to the distance from the shore. The monopile foundation can adapt to different geological conditions, and h...

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Problems solved by technology

With the increase in the bearing capacity requirements of the foundation for the fan unit, the diameter of the pile body needs to be increased accordingly, and rock-socketed pile construction is often required. At the same time, weathered boulders in granite areas are common and difficult to detect. The

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