E - Fixed Constructions – 02 – B
Patent
E - Fixed Constructions
02
B
61/8
E02B 17/02 (2006.01) E02B 17/04 (2006.01)
Patent
CA 1079994
ABSTRACT OF THE DISCLOSURE A tower is installed at an offshore worksite by floating to the worksite a tower subassembly which comprises a base, a plurality of upright open- trussed initial leg segments, and a plurality of flotation tanks. A plurality of open-trussed add-on leg segments are stored on a vessel in the vicinity of the worksite. The flotation tanks are ballasted to partially immerse the subassembly so that buoyant jacking units disposed within and connected to respective ones of the initial leg segments floatingly support the subassembly, with top portions of the initial leg segments projecting above the water surface. Add-on leg segments are mounted onto the leg portions projecting above the water surface. While the subassembly is suspended from the jacking units, the subassembly is lowered so that the jacking units enter the add-on leg segments as the add-on leg segments pass downwardly therearound. These steps are repeated so that the subassembly is gradually built-up with leg segments and is progressively submerged. When the base is supported on the sea floor, the jacking units are lifted from the top ends of the tower legs. A work platform is then installed on the tower legs above the water surface.
304258
Allee John W.
LandOfFree
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