Van Oord has released details of an innovative, high-spec trenching machine it will use while constructing the Hollandse Kust (Zuid) offshore windfarms in the Netherlands
TenneT is building the Hollandse Kust (Zuid) grid to the north of the Maasvlakte in Rotterdam, to connect the Hollandse Kust (Zuid) windfarms. Four cables will have to be installed and buried more than 5 m for the first 10 km of the offshore cable route. Specifically for the job, Van Oord designed and built ‘Deep Dig-It,’ a large remotely controlled trencher.
Van Oord, which is part of the Van Oord-Hellenic Cables consortium, recently started final testing of the machine in the Alexiahaven, in the Maasvlakte 2 area at Port of Rotterdam, in preparation for the project.
Deep Dig-It is a tracked remotely operated vehicle which creates a trench for the cables while simultaneously inserting the cables and then closing the trench again.
Van Oord said the new trencher is the largest and most powerful machine in its class. It weighs 125,000 kg, is more than 17 m long, more than 8 m high and 11 m wide. It has an installed power of 2,500 hp, making it possible to bury cables into very hard soils.
“The burial depth that can be achieved by the trencher is unmatched, well over 5m,” said Van Oord.
Deep Dig-It will be controlled from Van Oord’s offshore installation vessel MPI Adventure, which is equipped with a crane that launches and recovers the trencher.