Walhout Civil has been contracted by DISA International to design and engineer all the steelwork and caission constructions. The steel caissons were installed (at a depth of -22.0m TAW) in the front of the quay wall in order to repair the construction. Next, professional divers installed sheet piles in the caissons, fully injected them with polyurethane and filled the construction with underwater concrete. The operations were time-consuming and very risky due to high tides and strong currents.
Walhout Civil therefore invented a climbing system and unique cofferdam construction for professional diving operations, to work safely and protected, free of tides and strong currents. The more than 24.0 meter high cofferdam construction is demountable, transportable by truck and can be moved under the waterline using a special cable system. The successful cofferdam is prevents a lot of financial losses and has significantly improved the safety of professional diving operations. The innovation is now being used worldwide for quay wall repair.