The Bjørvika Tunnel, Oslo, Norway
DEVI supported the first immersed tunnel in Norway
The Bjørvika Tunnel is a motorway immersed on European Route E18 in the city center of Oslo. The tunnel links Festning tunnel in Oslo west with Ekeberg tunnel in Oslo east. The completed tunnel has an unbroken length of six kilometers.
The immersed part of the tunnel is made up of six elements. Each element is 112.5 meters long, 28–43 meters wide and 10 meters high. The immersed tunnel consists of two tubes, with three lanes in each direction. The tunnel is 1,100 meters long, 675 meters of which are below sea level. The Bjørvika Tunnel is part of the Opera Tunnel complex, which is the interconnected system of tunnels between Ryen and Filipstad.
The Bjørvika Tunnel was opened in September 2010 as the first immersed tunnel in Norway. During its construction, DEVI electrical heating solutions were used to harden the concrete in roof and walls in the immersed part of the tunnel. A uniform concrete may cause a problem, especially during the Scandinavian winter. DEVI electrical cables were chosen to make sure that hardening process unfolded properly.
DEVI electrical solutions are used to maintain a normal concrete hardening process during winter where temperatures often fall below the freezing point to not delayed that building process due to the weather conditions.
- 1 100 meters of tunnels
- 675 meters of which is immersed