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Method for applying gravity-type foundation to offshore wind power engineering in sea area with soft-soil seabed

A technology of gravity foundation and offshore wind power, which is applied in the direction of foundation structure engineering, building, sheet pile wall, etc., can solve the problems that gravity foundation is difficult to apply, improve the bearing capacity and stability of engineering mechanics, reduce the cost and expand the application range effect

Inactive Publication Date: 2016-10-12
SHANGHAI ELECTRIC POWER DESIGN INST
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Problems solved by technology

[0005] However, since the surface layer of the seabed in my country's coastal waters is soft soil, the gravity foundation is difficult to apply

Method used

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  • Method for applying gravity-type foundation to offshore wind power engineering in sea area with soft-soil seabed
  • Method for applying gravity-type foundation to offshore wind power engineering in sea area with soft-soil seabed
  • Method for applying gravity-type foundation to offshore wind power engineering in sea area with soft-soil seabed

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Embodiment Construction

[0029] like figure 1 Shown, a specific embodiment of the present invention, the surface layer of construction sea area seabed is soft soil layer 4, and below soft soil layer 4 is hard soil layer 5, uses cement-soil mixing pile 1 to reinforce seabed in the reinforcement area, A cushion layer 2 is laid on the top of the cement-soil mixing pile 1 within the reinforcement range 6, and a gravity foundation 3 is installed on the cushion layer 2.

[0030] In this embodiment, the conditions of the seabed at the construction site are: the upper layer is a soft soil layer with a thickness of 8m, and the bearing capacity of the base (f sk ) is 60kPa, and the side friction of the soil layer (q s1 ) is 10kPa, the subsoil is silty sand layer with a thickness of 20m, and the lateral friction of the soil layer (q s2 ) is 55kPa, pile end resistance (q p ) is 1500kPa.

[0031] The weight of the gravity foundation to be installed is 1500 tons, the base is circular, the diameter is 25m, and t...

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Abstract

The invention discloses a method for applying a gravity foundation in an offshore wind power project in a soft soil seabed sea area, which sequentially includes: determining the strength that the cement soil should reach, selecting a suitable cement variety and cement model, making a cement soil mixing pile for indoor Test and field test; determine the reinforcement range, pile diameter, pile length and pile spacing of cement-soil mixing piles; carry out on-site construction of cement-soil mixing piles; test the bearing capacity of the reinforcement area, remove the soil layer above the pile top, and then install the piles Set up the cushion layer on the top, and level the surface of the cushion layer; install the gravity foundation. The present invention strengthens the soft soil seabed by the cement-soil mixing pile method, thereby improving the bearing capacity and engineering mechanical stability of the reinforced area, so that the gravity foundation of offshore wind power can be applied to the soft soil seabed along the coast of my country, reducing the The cost of wind power projects.

Description

technical field [0001] The invention relates to the technical field of wind power engineering, in particular to a method for applying gravity foundations in offshore wind power engineering in soft soil seabed sea areas. Background technique [0002] Offshore wind power is a hot spot in wind power development in recent years, and it has attracted much attention because it has better offshore wind resources and does not occupy land. However, due to the influence of the marine environment, offshore wind power projects have higher technical requirements for wind turbine foundations and higher construction costs. Europe is the pioneer of offshore wind power. During the development of offshore wind power in the past two decades, the wind turbine foundations of European offshore wind power have adopted various forms, such as monopile foundations, jacket foundations, and gravity foundations. These foundation forms can be used In seas where the water depth does not exceed 25m. [0...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D27/42E02D5/46
CPCE02D27/425E02D5/46E02D2250/0061
Inventor 文锋
Owner SHANGHAI ELECTRIC POWER DESIGN INST
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