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Quay walls and mooring dock at Cuxhaven, Germany18th November 2008In February 2008, the Governement of Lower Saxony approved the construction of Berth 8 in the old 'Grodener Hafen', which includes a production yard for the steel foundation elements of wind turbines. Berth 8 will comprise a 160 m mooring dock, a 115 m waiting area for the transport ships, and a 116 m long loading area built perpendicular to the dock and the waiting area. A water depth of 9.5 m is projected for the three mooring spots at Berth 8. PU22 sheet piles were installed as temporary soil retaining wall, enabling land-based installation of the heavy steel piles forming the harbour walls. 
Driving of pipe-AZ combi-walls and PU22 temporary sheet pile wall The permament berth wall consists of a combi-wall with up to 35 m long tubular piles with a diameter of 1420 mm and a wall thickness of 16 mm in steel grade API X65. C9 connectors were welded to the king piles to relate them to the intermediary sheet piles. The upper portions of the sea-facing side were provided with a protective coating. The tubular piles came from ArcelorMittal Projects' spiral tube mill in Dintelmond (Netherlands) and were shipped to Cuxhaven. An internal ring (30/200) at the bottom of the tubular piles, strengthens the toes of the piles, and increases their bearing capacity. ArcelorMittal's new extra-large AZ14-770 10/10 piles in steel grade S 390 GP were installed next as intermediary piles. The combined walls were anchored with inclined HTM 600 piles with lengths ranging from 45 to 65 m. The 20 m wide load-relieving platform is founded on concrete bearing piles, 61 cm in diameter. The crain rails of the loading platform are incorporated in the 4 m high concrete capping beams. The total project had a construction time of merely 8 months. 9020 tons of steel were used in this project, of which: Owner: Cuxport, Cuxhaven, Germany |