Hydraulic and earth engineering – Marine structure or fabrication thereof – With work deck vertically adjustable relative to floor
Patent
1979-08-06
1981-05-05
Corbin, David H.
Hydraulic and earth engineering
Marine structure or fabrication thereof
With work deck vertically adjustable relative to floor
405208, 405224, E02B 1708
Patent
active
042655684
ABSTRACT:
The invention relates to an offshore, gravity base, jack-up platform comprising a deck, a gravity base and one or more legs interconnecting the deck and base. The gravity base comprises a generally polygonal shaped, monolithic hull structure with reaction members extending downwardly from the hull to penetrate the waterbed and react to vertical and lateral loads imposed upon the platform while maintaining the gravity hull in a posture elevated above the surface of the waterbed.
A method aspect of the invention includes the steps of towing a gravity base, jack-up platform, as a unit, to a preselected offshore site floating upon the gravity hull. During the towing operation, the deck is mounted adjacent the gravity base with a leg or legs projecting through the deck. At a preselected offshore station ballast is added to the gravity base and the platform descends slightly to a posture where the platform is buoyantly supported by the deck. The base is then jacked down toward the seabed and the platform is laterally brought onto station. Ballast is then added to the deck and the reaction members are penetrated into the waterbed to operational soil refusal. Ballast is then ejected from the deck and the deck is jacked to an operational elevation above a predetermined statistical wave crest height.
REFERENCES:
patent: 2941369 (1960-06-01), Quirin
patent: 3062014 (1962-11-01), Newcomb
patent: 3241324 (1966-03-01), Storm et al.
patent: 3996754 (1976-12-01), Lowery
patent: 4007598 (1977-02-01), Tax
patent: 4043138 (1977-08-01), Stageboe
"New Concepts on Platforms for Deep Water", Ocean Industry, Sep. 1972.
"Developers Say New Type Platform Looks Good", Ocean Industry, Mar. 1973.
"Gravity Platform Designed to Reduce Offshore Costs", World Oil, Nov. 1973.
"New Platform Makes Well Slanting Simple", Ocean Industry, May 1976.
"Upright Steel Gravity Platform is Towed to Field Off Congo", Ocean Industry, May 1976.
Herrmann Robert P.
Pease Floyd T.
Ray Donald R.
Corbin David H.
Kile Bradford E.
The Offshore Company
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