Composite foundation-bucket offshore wind power foundation with piles distributed in bucket and construction method

Abstract

The invention relates to a composite foundation-bucket offshore wind power foundation with piles distributed in a bucket and a construction method. The wind power foundation is suitable for the sea area with offshore surface layers covered with weak soil such as thick mud, mucky soil and silty soil in China and comprises a concrete transition section, a composite bucket foundation, a concrete circular bottom plate and the in-bucket piles, wherein the composite bucket foundation is of a multi-bin structure with a lower open cavity and is sunk in soft soil on the surface layer, the top of the bucket is in contact with the mud surface, and the in-bucket piles are uniformly distributed in each compartment plate in the bucket. The advantages of underwater deep cement mixing piles (or compactedsand piles) and the bucket foundation are combined, the bearing area of the bucket foundation is large, the stability is good, piling is not needed, but under the soft soil condition, the settlement and inclination of the bucket foundation are large, and the cement piles (or the compacted sand piles) are arranged in the bucket foundation, so that the problem of foundation deformation of the bucketfoundation is solved, the manufacturing size of a suction bucket is reduced, and the foundation manufacturing cost is reduced.

Description

technical field [0001] The invention relates to an offshore wind power foundation structure, in particular to a composite foundation with piles arranged in a tube-tube offshore wind power foundation and a construction method. Background technique [0002] Based on the soft foundation conditions such as silt and silty clay in most of my country's offshore areas, generally in order to meet the requirements of foundation bearing capacity and foundation deformation, traditional pile foundations such as single pile foundations and jacket foundations are usually used. These two foundation forms require Large-scale hoisting ships and piling ships assist in the construction. By hammering piles, the piles penetrate the weak soil layer and enter the better bearing layer. This traditional pile foundation has a high cost and a long construction period. [0003] With the increase of the unit capacity of offshore wind turbines, the use of traditional monopile and jacket foundations require...

AI Technical Summary

Problems solved by technology

[0002] Based on the soft foundation conditions such as silt and silty clay in most of my country's offshore areas, generally in order to meet the requirements of foundation bearing capacity and foundation deformation, traditional pile foundations such as single pile foundations and jacket foundations are usually used. These two foundation forms require Large-scale hoisting ships and piling ships assist in the construction. By hammering piles, the piles penetrate the weak soil layer and enter the better bearing layer. This traditional pile foundation is expensive and has a long construction period.

[0003] With the increase of the unit capacity of offshore wind turbines, the use of traditional monopile and jacket foundations requires an increase in the size and material consumption of the foundation, and the limitation of large-diameter single-pile piling by construction equipment has become an insurmountable problem. To solve this problem, The suction composite cylindrical foundation as described in patent CN107761755A and patent CN106759445 is gradually being used in offshore wind power. The negative pressure sinking installation method of the cylindrical foundation (as shown in the patent CN105926661A) avoids the cumbersome piling process, and the cylindrical foundation is due to Its mechanical characteristics and construction methods are suitable for soil layers such as clay and sandy soil with a certain bearing capacity. For silt and muddy soil layers with poor bearing capacity, the diameter of the tube needs to be increased if the tube foundation is used, and because the tube type The weight of the foundation and the load of the fan increase, which brings the problem of large foundation settlement and inclination deformation. If the size of the cylindrical foundation is excessively increased, not only the cost will be increased, but also the one-step installation cannot be realized (as shown in the patent CN102926949A), which is economical The advantages over monopile and jacket no longer exist

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