Offshore wind power single pile-friction cone composite foundation and construction method thereof

Abstract

The invention discloses an offshore wind power single pile-friction cone composite foundation and a construction method thereof. The offshore wind power single pile-friction cone composite foundationcomprises a single pile and a friction cone, wherein a rock-fill body is arranged inside the friction cone, a cemented rock-fill body shell is arranged outside the friction cone, and the cemented rock-fill body shell is obtained by grouting and cementing the rock-fill body outside the friction cone. The construction method of the offshore wind power single pile-friction cone composite foundation comprises the following steps of 1, carrying out single pile construction by using pile sinking equipment; 2, stacking graded crushed stone materials on seabed around the single pile to form the friction cone; 3, placing a grouting device on the surface of the rock-fill body outside the friction cone; and 4, conveying underwater self-protection cementing materials through the grouting device, wherein the cementing materials fill gaps of the rock-fill body outside the friction cone to form a cemented rock-fill body. The offshore wind power single pile-friction cone composite foundation has the advantages of high horizontal bearing capacity, small pile body horizontal displacement, deformation and bending moment and the like, and has the characteristics of simple construction, high adaptability to geological conditions and the like.

Description

technical field [0001] The invention relates to the technical field of offshore wind power, in particular to an offshore wind power single pile-friction cone composite foundation and a construction method thereof. Background technique [0002] As a clean energy source, offshore wind power has the characteristics of high wind speed, stable wind speed, and large capacity of a single unit. The offshore wind power industry is in a period of rapid development. Due to the complex geological conditions in sea areas, 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 single p...

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Problems solved by technology

At the same time, for sea areas with boulders in deep water and shallow overburden, rock-socketed pile foundation construction is required. It is difficult to detect boulders, and boulders are easy to cause curling, stuck holes, and collapsed holes of steel pipe piles, and the construction risk is relatively high. , the construction progress is slow. If the boulder is misjudged as a complete bedrock during the survey, the pile end will be located in the boulder, which will have a significant impact on the stability of the wind turbine.

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