The two breakwaters which have a combined length of more than 2 kilometres were constructed between 1834 and 1861 and are urgently in need of renovation.
The renovation works mainly involve the coordinated removal of the old rock bed followed by the installation of a new protection layer of rocks of various weights and formats. In total, a quantity of more than 400,000 tons of rock will be installed. Tetrapods weighing 25 tons and concrete cubes weighing up to 40 tons from existing parts of the breakwaters will be reused in the new design. In addition, a new steel combi-wall of sheet piles and tubular poles will also be installed and anchored underwater. The concrete top layer of the breakwaters will also be taken care of and associated dredging will be carried out.
We will be using our own equipment for these works: Gaverland, Albatros, Beaver & Otter, Helgoland, cable cranes and excavators.