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Soft soil foundation seabed fixed mounting construction method of water building ocean fixed platform

A technology for offshore platforms and soft soil foundations, which is applied in construction, water conservancy engineering, infrastructure engineering and other directions to achieve significant economic benefits and less damage to the environment and ecology.

Active Publication Date: 2015-07-08
GUANGDONG SEACITY DEV HLDG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention is mainly aimed at sea areas with deep buried soft soil foundations, especially sea areas with thick soft soil layers that cannot be completely excavated

Method used

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  • Soft soil foundation seabed fixed mounting construction method of water building ocean fixed platform
  • Soft soil foundation seabed fixed mounting construction method of water building ocean fixed platform
  • Soft soil foundation seabed fixed mounting construction method of water building ocean fixed platform

Examples

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example 1

[0082] A platform of 50m×50m is supported by four buoyancy cylinders with a diameter of 8.8m, with a total weight of 8,500 tons. The platform is expected to support a total of 12,000 tons of building loads and live loads. Supported by rock-socketed piles, the water depth of the installation site is 8 meters. The geological data are shown in Table 1:

[0083] Table 1: Geological Standard Penetration Number of Installation Site (SPT N-Value)

[0084] Depth (m) Rock and soil name Measured penetration volume (cm) Average measured hits (N) 5-10.75 silt 30 1 12.30-22.70 Silty Clay 30 10 26.10-30.2 silt 30 49 32.4-36.65 Silty Clay 30 17 38.6-51.25 fine-medium sand 30 58 53.05-58 Gravel 10 150

[0085] It can be seen from Table 1 that the 5m of the seabed is silt, which cannot bear the self-weight of the platform when it is installed. Steel cylinders are used as temporary supports. In the case of ignoring the surface...

example 2

[0093] Instead of using pile foundations, the method of replacing bearing materials in steel cylinders is adopted. Among them, the load is directly transmitted from the bottom of the buoyancy cylinder wall to the displacement material column and then to the bearing layer on the seabed.

[0094] Firstly, the bearing layer is searched according to the geological data. The depth of the strongly weathered rock formation is 58m, and the number of standard penetration hits is >200.

[0095] Taking the depth of the strongly weathered rock formation as the depth of vibration of the steel cylinder, the total length of the steel cylinder is 2+8+(58-5)=63m, of which 2m on the water surface, 8m in the water, and 53m buried in the seabed.

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Abstract

The invention discloses a special mounting and construction method for seabed fixation of an offshore platform in a soft soil layer sea area; and in a thick soft soil environment, a soft soil layer cannot be totally dug away. The method comprises the following steps: a large-diameter steel cylinder is beaten into the soft soil layer as a temporary or permanent support of a buoyancy cylinder; the buoyancy cylinder is accurately supported on the steel cylinder according to a preset plane and a vertical position; then, the piling is performed to produce a platform on piles; or the steel cylinder is used as a cofferdam, soft soil in the cylinder is replaced or modified to bear the load of the platform; the load is carried to a force holding layer at the seabed; and a straight cone at the bottom of the buoyancy cylinder and a concrete bed reverse cone prepared at the seabed are coupled to solve the position adjusting problem of the platform. The offshore platform and the mounting and construction method thereof can be applied to natural geological environments of all offshore areas; compared with the land reclamation, the method less destroys the environmental ecology; and compared with a steel floating platform, the offshore platform has more prominent economic benefit.

Description

technical field [0001] The invention relates to the seabed fixed installation and construction method of offshore platforms such as offshore buildings, offshore wind turbines, and offshore bridges on soft soil foundations, wherein the offshore platform includes a platform composed of a series of beams and slabs supported by at least one buoyancy cylinder, and is floated during construction. , the service stage is fixed on the seabed. The installation and construction method of the present invention can be applied to sea areas with soft soil layers of different thicknesses and depths, and can greatly improve the application of ocean platforms in different fields. Background technique [0002] In the process of developing marine resources, offshore wind energy, ocean energy, and offshore cities need a supporting base, which can be a floating base or a base fixed on the seabed. The floating base is not easy to anchor when the near-shore water depth does not exceed 50 meters, a...

Claims

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Application Information

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IPC IPC(8): E02B17/00
CPCE02B17/00E02B2017/0039E02B2017/0043E02B2017/0056
Inventor 黄灿光
Owner GUANGDONG SEACITY DEV HLDG LTD
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