Offshore wind power foundation comprising single column and negative pressure cylinder and provided with dense beams at top of cylinder and separated bins in cylinder

Abstract

The invention relates to an offshore wind power foundation comprising a single column and a negative pressure cylinder and provided with dense beams at the top of the cylinder and separated bins in the cylinder. The offshore wind power foundation comprises the single column and the negative pressure cylinder, the bottom of the single column is connected with a top plate of the negative pressure cylinder through a T-shaped ring beam,; an inclined support is arranged between the single column and the negative pressure cylinder; the inclined support comprises a plurality of inclined columns, vertical plates and horizontal beams which are evenly arranged in the circumferential direction; every two of the inclined columns, the vertical plates and the horizontal beams are connected through intersection of straight sections or transition by an arc; main beams are arranged between adjacent horizontal beams; the main beams are welded on the top plate along the radial direction; and secondary beams are arranged between the main beams and the horizontal beams and are arranged along the circumferential direction of the top plate. The inclined support and the top plate of the negative pressurecylinder are connected into a whole, so the load borne by the single column is effectively transmitted to the negative pressure cylinder. The advantages that a single pile foundation is simple in construction and clear in force transmission, and a cylindrical foundation is good in stability and convenient to install at sea are combined; and the problems that a traditional pile type foundation needs large equipment for offshore piling operation, and rock-socketed construction is large in difficulty, long in construction period, high in manufacturing cost are solved.

Description

technical field [0001] The invention relates to an offshore wind power foundation structure, in particular to an offshore wind power foundation with a single-column negative-pressure cylinder with dense beams on the top of the tube. Background technique [0002] Based on the geological conditions such as silt, silty soil, clay, and sandy soil in most of my country's offshore areas, in order to meet the requirements of foundation bearing capacity and foundation deformation, pile foundations such as single piles and jackets are usually used, requiring large hoisting ships and pilings. Ship-assisted construction, through hammering, drives the bottom of the pile into a better bearing layer. This traditional pile foundation has a high cost and a long construction period. For example, in sea areas such as Fujian and Guangdong, it is mostly rock foundations with shallow covering layers. , such as the use of pile foundations requires rock-socketed construction, which is difficult, lon...

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Problems solved by technology

[0006] An offshore wind power composite cylindrical foundation (patent CN207567801U) can avoid offshore piling and rock-socketing operations, but the stress concentration at the connection between the single column in the middle of the foundation and the steel pipe diagonal brace is very obvious, which is not conducive to fatigue and punching of the foundation, and consumes steel The quantity is large; reinforced concrete needs to be installed on the roof of the tube, and concrete needs to be poured into the inside of the diagonal brace. The construction process is complex and complicated, and the foundation weight is large, which is not conducive to foundation fabrication, transportation and hoisting; the project cost is high

[0007] Offshore wind turbine monopile-suction cylinder combined foundation and its construction method (patent CN 110016930A) can avoid offshore piling and rock-socketing operations. The joint of the tube is too weak, the roof of the tube has no effective support system, and the rigidity is weak, so the fan load borne by the single pile in the middle cannot be effectively transmitted to the tube.

[0008] A connection tool (CN 110607802 A) for the combined foundation of a single column and a composite cylinder can avoid offshore piling and rock-socketing operations, and only the upper ring plate is arranged at the connection between the diagonal brace of the foundation and the single column in the middle, where the stress is concentrated Obviously, it is unfavorable for fatigue and consumes a lot of steel; the diameter of the single column in the middle extends into the cylinder to form an intermediate cabin. Since its diameter is smaller than that of the cylinder, it is easy to produce a soil plug effect during the negative pressure subsidence process, which may lead to The sinking failed; due to the small diameter of the single column in the middle, the length of the other compartment plates in the tube is greatly increased, and buckling damage is prone to occur during transportation and sinking; the project cost is high

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