Jacket constructions belong to the dissolved load-bearing structures in the offshore industry. They are already used for many years for the establishment of oil and gas platforms. There are now but also in the field of wind energy first prototypes, which were set up, both onshore and offshore of REpower Systems AG together with industrial partners.
A Jacket consists usually of four corner posts and tubular crossing diagonals, which are assembled at the factory with the help of welded connections (see figure at left). Further, a transition node is required in order to safely transfer forces and moments from the first tower section with a circular geometry of the jacket with a rectangular geometry can. This transition node is one of the most important components in Jackets for offshore wind turbines (see figure at right).