The Westerschelde Tunnel Project - The Netherlands - Mix-Gas-Saturation
The bores of the tunnel under the River Westerschelde in the Netherlands were driven using the hydroshield tunnelling method with subsequent segment lining.
The tunnel diameter was 11.33 metres and the two bores were each 6,600 metres long.
Tunnelling work started on 1 July 1999.
In order to support the cutting face the TBM used combined bentonite/compressed air head, with maximum pressures of 6.2 bars being reached. Divers were used to carry out repair and maintenance work in hyperbaric conditions.
The tunnels run from Terneuzen (Zeeusch-Vlaanderen) to Ellewoutsdijk (Zuid-Beveland).
Contractors involved in the project:
Philipp Holzmann - Wayss & Freytag - Heijmans - Bam-Infrabouw - Franki - Voormolen Bouw