Abstract
The composite bucket foundation (CBF) for offshore wind turbines is the basis for a one-step integrated transportation and installation technique, which can be adapted to the construction and development needs of offshore wind farms due to its special structural form. To transport and install bucket foundations together with the upper portion of offshore wind turbines, a non-self-propelled integrated transportation and installation vessel was designed. In this paper, as the first stage of applying the proposed one-step integrated construction technique, the floating behavior during the transportation of CBF with a wind turbine tower for the Xiangshui wind farm in the Jiangsu province was monitored. The influences of speed, wave height, and wind on the floating behavior of the structure were studied. The results show that the roll and pitch angles remain close to level during the process of lifting and towing the wind turbine structure. In addition, the safety of the aircushion structure of the CBF was verified by analyzing the measurement results for the interaction force and the depth of the liquid within the bucket. The results of the three-DOF (degree of freedom) acceleration monitoring on the top of the test tower indicate that the wind turbine could meet the specified acceleration value limits during towing.
Highlights
The amount of energy produced by offshore wind turbines is expected to increase significantly in the coming years, as offshore wind turbines become more profitable
This paper focused on one of the key technologies for the one-step transportation and installation of composite bucket foundation (CBF) for a turbine wind farm near Xiangshui in China
During the process of lifting the wind tower, the three-way acceleration of the installation ship was always less than 0.01 m/s2, and the roll and pitch angles were less than 0.02◦, which means the whole structures have good stability and stay in an adequately stable position during hoisting
Summary
The amount of energy produced by offshore wind turbines is expected to increase significantly in the coming years, as offshore wind turbines become more profitable. Compared to conventional construction methods for offshore wind turbines, CBFs have the following advantages: followed by suction sinking and leveling of one-step installation [16,17,18,19,20,21]. Thiagarajan et al studied the wave response of air-floating structures in shallow water by theoretical analysis and model tests [26,27]. As a floating structure with air cushion, the CBF is equal toathe structure bucket of a CBF is divided into seven compartments by bulkheads, forming honeycomb supported on the spring coupled by the compressible air and water. Studied the the wave response of air-floating the transportation of water the CBF with a test analysis tower for the Xiangshui wind farm, whichofisChenu monitored.
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