Pile box barrel composite foundation for offshore wind power and construction method thereof

Abstract

The invention discloses a pile box barrel composite foundation for offshore wind power. The pile box barrel composite foundation comprises a single pile and a barrel body, wherein the barrel body comprises an inner barrel body, an outer barrel body, a negative pressure barrel top plate and a plurality of negative pressure barrel partition plates; the inner barrel body is coaxially arranged in an inner cavity of the outer barrel body and arranged on the single pile in a sleeving mode; the inner barrel body and the single pile are connected into a whole through grouting; the negative pressure barrel top plate is arranged between the upper portion of the inner barrel body and the upper portion of the outer barrel body in a sealing and covering mode, so that a negative pressure barrel is formed on the lower portion of the negative pressure barrel top plate, an open box barrel is reserved on the upper portion of the negative pressure barrel top plate, and the interior of the open box barrelis divided into a plurality of weight areas through a plurality of rib plates; the plurality of negative pressure barrel partition plates are evenly connected into the negative pressure barrel in theradial direction to divide the negative pressure barrel into a plurality of negative pressure cabins; and after the barrel body penetrates into seabed soil and the negative pressure barrel top platereaches the designed elevation, the weight areas of the open box barrel are filled with riprap weights, and the box-shaped foundation is formed. The invention further discloses a construction method of the pile box barrel composite foundation for offshore wind power. By means of the pile box barrel composite foundation for offshore wind power and the construction method thereof, the anti-overturning bearing capacity can be improved, and the buried depth of the single pile is reduced.

Description

technical field [0001] The invention relates to a pile-box-barrel composite foundation for offshore wind power and a construction method thereof. Background technique [0002] The population and industries in the coastal developed areas are concentrated, and the development of offshore wind power is in line with the sustainable development concept of local energy utilization. The cost of the foundation part of offshore wind power can reach 15% to 25% of the total cost. For offshore wind power with a water depth of less than 35m, large-diameter steel pipe piles are considered to be one of the most suitable foundation types for offshore wind power. [0003] The design of large-diameter single-pile foundation for offshore wind power needs to meet the deformation and frequency requirements, so the pile foundation is required to have a certain buried depth. For strata with shallow burial depth, the depth of pile foundation rock-socketed section is relatively large. The construc...

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Problems solved by technology

When there is a hard soil layer in the lower part of the seabed or the mud surface fluctuates greatly, the negative pressure bucket foundation may not reach the design elevation

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