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An off-shore structure, a buoyancy structure, and method for installation of an off-shore structure

一种浮力结构、海上结构的技术，应用在浮动建筑物、运输和包装、舰艇等方向，能够解决钢结构维护成本高、钢易受到海水腐蚀的影响、固定浮箱重量大等问题

Inactive Publication Date: 2013-12-04
SINGLE BUOY MOORINGS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This results in a greater weight for the fixed pontoons
In addition, steel is particularly susceptible to seawater corrosion
The maintenance cost of steel structure is relatively high

Method used

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  • An off-shore structure, a buoyancy structure, and method for installation of an off-shore structure
  • An off-shore structure, a buoyancy structure, and method for installation of an off-shore structure
  • An off-shore structure, a buoyancy structure, and method for installation of an off-shore structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0049] figure 1 The offshore structure shown is generally designated with reference number 1 . The offshore structure 1 forms a hydrocarbon production system particularly suitable for water depths greater than 1000 meters. The offshore structure 1 comprises a truss support structure 2 supporting a superstructure 3 above a water surface 8 of a body of water 7 such as the sea. The body of water 7 has a region close to the water surface 8 where most of the wave-induced hydrodynamic forces occur, which is called the wave active region 9 . The superstructure 3 may include deck structures, drilling and hydrocarbon production equipment and other structures (not shown).

[0050] The truss support structure 2 is partly submerged in water 7 . Below the water surface 8 the truss support structure 2 is attached to the buoyancy structure 5 . The buoyancy structure 5 is below the truss support structure 2 . The truss support structure 2 extends to a depth below the water surface 8 such...

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PUM

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Abstract

A buoyant submersible structure floating above the sea floor includes a support portion to support a load, and a gas-filled tank. The tank has an opening, and a connected tube. The tube is partially filled with seawater defining a water-gas interface at a first level. In operation, the structure is fully submerged below the water surface to a first depth. The second chamber is partially filled with seawater defining a water-gas interface at a first position inside the second chamber. Then, the buoyancy structure is moved to a second, greater depth. Water enters the second chamber to raise the water-gas interface to a second, higher level and without entering the first chamber. Subsequently, the buoyancy of the structure is adjusted to tension the cable, a support structure to support a load is attached to the structure, and then the buoyancy of the structure is readjusted.

Description

technical field [0001] The invention relates to an offshore structure comprising: [0002] - supporting structures to support the load, [0003] - A buoyancy structure attached to the support structure, the buoyancy structure being adapted to be fully submerged under the water surface and to float above the sea floor. Background technique [0004] US6213045 discloses a cylindrical buoy connected to the seabed by catenary mooring cables. The spar buoy includes a buoyancy structure having buoyancy tubes each having an extension tube extending downwardly from the buoyancy tube and opening at the bottom thereof. For stability reasons the center of buoyancy (CB) is higher than the center of gravity (CG), so the spar buoy has a lower truss section provided with ballast and an upper buoyancy section located in the wave active area. Thus, the spar buoy moves in vertical and lateral directions due to wave induction. As the structure moves up and down in a storm, the air will peri...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B63B35/44
CPCB63B35/4413B63B35/44
Inventor 杰克·波拉克
Owner SINGLE BUOY MOORINGS INC