Global Tech I Offshore Wind GmbH (GTOW) intends to develop the Global Tech I (GTI) offshore wind farm. GT1 is located in the German Bight (North Sea) approximately 60 nautical miles (111km) north west of Cuxhaven. The wind farm will comprise 80 tripod supported turbines founded on piles and one offshore substation using a caisson foundation. WeserWind GmbH (WW) was contracted by GTOW to develop a first set of 40 turbines (Phase I). WW contracted Cathie Associates SA/NV (CA) to design the pile foundations for these 40 locations
Training session for use of PDI Pile Driving Monitoring Equipment and data processing and analysis.
As part of the development of new facilities on the Berri Causeway and Abu Ali Island, a pile supported pipe rack is under construction by RGF. In order to verify the axial capacity of the piles, and to mitigate the risk of overstressing the piles during driving through cemented or coral layers, assistance was provided to RGF for performing the dynamic monitoring and interpreting the results.
Dynamic testing of 10 foundation piles and specifications for design of a drop hammer suited for the dynamic tests.
Foundation piles of the IKALOU and IKALOU SUD tripods were continuously monitored during driving using under-water strain gauges (4 per pile) and accelerometers (2 per pile). Re-strike tests were performed on both platforms and the driving data were back-analysed into a Soil Resistance to Driving (SRD) using the global method. At re-start at 45 m depth, representative signals were analysed by the signal matching method, using CAPWAP software. The back-calculated SRD generally confirmed expectations although local soil variability was observed between the two sites.