Offshore apparatus and method for installing

Patent

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Details

61 50, E02B 1700

Patent

active

040831930

ABSTRACT:
The offshore apparatus in preferred form comprises a structure mounted on the ocean floor and terminating in a platform located beneath the surface of the water to carry loads extending above the surface. A plurality of legs extend generally vertically through a template base resting on the ocean floor and are anchored in the ocean bed below the base. A load platform is connected to the upper portions of the legs and is buoyant enough to maintain the legs in tension and to support the load which it carries. A stabilizer member is connected to the legs intermediate their length and is also buoyant to apply additional tension to the legs, and a series of mooring members are connected to the stabilizer member to minimize side sway in response to ocean currents. In the preferred method of installation, all three components are buoyant and are towed to the site of operations as a unit, and lowered to the ocean floor by ballasting them with sea water. The legs are installed through passages in the components and the platform and stabilizer member are de-ballasted to rise to their final positions while the base remains ballasted and serves to maintain the integrity of the anchoring of the legs.

REFERENCES:
patent: 2979911 (1961-04-01), Sutton
patent: 3191388 (1965-06-01), Ludwig
patent: 3355899 (1967-12-01), Koonce et al.

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