With current construction technology of offshore wind turbines, there is a need for a major marine spread to install the foundation, tower and turbine. There is a clear benefit that offshore installation can be integrated into one operation. The large-scale composite bucket foundation is a basis for the one-step integrated transportation and installation technique with a special vessel. The proposed transportation and installation technique will minimize offshore spread and maximize the proportion of work carried out onshore with consequent benefits in terms of cost, quality and safety. The composite bucket foundation with self-floating property would be towing into a semicircle groove of the vessel and connected with wireropes of the fixed crane. Afterwards, tower and turbine are attached onto the foundation at shore and the whole unit of foundation, tower and turbine is loaded out from the quayside, transported to site and set down on the seabed. During transportation, half of the unit weight is taken by the hoisting system of the vessel and other weight is supported by air cushions inside the composite bucket foundation. A detailed case is studied to determine the motions of the vessel with two units to confirm the viability and feasibility of such a method of the integrated transportation. The transportation and installation methodology are developed to reduce the time spent on offshore works in order to fit the installation work within the time windows with great economic benefits.

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