| abstract |
The invention relates to a method for building a marine structure by building the upper structure thereof on land or in shallow water, by loading this onto a semisubmersible catamaran-shaped vessel. which may be ballasted and deballasted to have a wide range of height positions while in the water, by bringing this vessel to the lower structure of the marine structure in deep water, so that this vessel straddles said lower structure, and by then lowering the vessel to discharge the upper structure onto the lower structure. The invention also relates to means to take over the upper structure at the building site by a pontoon, from which it is in another area taken over by the catamaran-shaped vessel, and to a method for building up the upper structure from modules and for completing this structure. Moreover, the invention relates to such catamaran-shaped vessel itself and to the structure thus built and handled. |