Oord has designed and built a new Deep Dig-It trencher, a gigantic and
remotely controlled trencher, to deploy on the Hollandse Kust Zuid grid
connection project being built by TenneT. Van Oord, being part of the Van
Oord-Hellenic Cables consortium, is conducting final tests with this enormous
machine in the Alexiahaven (harbour), in preparation for the actual installation
of the sea cables in July.
The Deep Dig-It is a so-called “Tracked Remotely Operated Vehicle” (TROV),
which drives unmanned over the seabed, creating a deep trench for the cables,
while simultaneously inserting the cables and then closing the trench again.
The new trencher is among the largest and most powerful machine in its
class. The trencher weighs 125.000 kilos, is more than 17 metres long,
well over 8 metres high, and 11 metres wide. It has an installed power
of 2,500 HP, making it possible to bury cables into very hard soils.
It is capable of burying cables to depths of up to 5 metres
The 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 Deep Dig-It into the sea.
TenneT awarded the Van Oord-Hellenic Cables consortium in 2018, to build
the connection from land to sea for the Hollandse Kust Zuid offshore grid
project. The consortium is installing and burying the sea cables crossing
the entrance to Europe’s busiest freight port, the port of Rotterdam.
The project will be completed in 2022: Alpha
(700MW) in 2021 and Beta
(700MW) in 2022, to transmit electricity generated by offshore wind farms
to for 1.6 million households.
The Hollandse Kust Zuid offshore wind grid project is 22 kilometres off
the coast of the Dutch province of Zuid-Holland. Subsea cables will connect
two offshore platforms with the Maasvlakte high voltage substation and
the Randstad 380 kV South ring. It will transmits energy generated by the
Kust Zuid 1&2
Kust Zuid 3 & 4
For more information on offshore wind
farms worldwide, click