The immersed tunnel will pass under the River Göta älv in the city of Gothenburg.
Construction will begin this year and take until 2020. The contract also includes mechanical and electrical works and an option to operate and maintain the tunnel for five years.
The tunnel will have three lanes in either direction with a service tunnel in the centre and a designed lifetime of 120 years. Züblin will construct three tunnel elements each with a length of 100m on site in a dry dock and immerse them at their final location in a trench dredged into the river bed. The other partner in the joint venture is Royal Boskalis Westminster, which will dredge the 20m-deep trench.
On either side of the immersed tunnel section, cut and cover tunnels will be built in deep excavation pits continuing in ramp and trough sections.
The project will start just after the handover of Trafikverket’s Söderströmstunnel in Stockholm, a project of similar size and complexity, also executed by Züblin as an immersed tunnel.