The Løvstakktunnel project, construction lot D15, as part of the extension of Bergen's tramway network, comprises the excavation of a 3 km long tramway tunnel with a parallel pedestrian and cycle tunnel (also serves as an evacuation tunnel) and 6 cross passages, 2 x 150 m long caverns as a railway depot, a rock cut for access buildings to the depot as well as extensive outdoor concrete work such as a cut & cover portal structure and numerous retaining wall structures.

Boundary data:

• 3 km double-track tram tunnel with 10 m width, 6 m height over upper edge of the rail, total approx. 233'300 m³.
• Rock outburst
• 3 km evacuation/pedestrian/cycle tunnel with
• T7, 5 SVV standard profile, total approx. 169'700 m³ rock outburst
• 6 cross passages with SVV standard profile T4 and approx. 18 m length, total approx. 8'500 m³ rock excavation
• 2 niches for technical buildings, total

approx. 1'500 m³ rock excavation

• Pumping station with basin, total approx. 5'000 m³

rock outburst

• Rock cut for access building with an area of 1’000 m² and a max. height of 16 m
• 2 depot halls with lengths 120-130 m, width of

17 m and height of 8 m, cross section 140 m²

• Access tunnel from the tram tunnel to the depot with a length of approx. 450 m, two branches at each end, cross-section varies between 55 and 180 m²
• Cut & Cover concrete portal with 120 m length
• Several retaining walls up to 7.30 m high
• Reconstruction of the road facilities incl.
• Roundabout on the portal
• Restoration of the landscape facilities