D18 Kronstad and Intrekks

  • Client: Bergen Light Rail
  • Main contractor: Veidekke ASA
  • Contractor: Metrostav Norge AS
  • Construction period: 11/2021 – 04/2022
  • Price: 32 400 000 NOK w/o VAT

Project characteristics:

The project contains 77,5 m of dead end Intrekks tunnel and the extension of the old 370 m Kronstad railway tunnel into a pedestrian and cycling tunnel in the inner city of Bergen.

Project data

 

Tunnel: 2 pcs (370 m + 77,5 m)
Tunnel profile: The extension 27 m2 + 96 m2
Excavated volume: 16 700 m3
Cement grouting: 70 000 kg
Rock bolts: 4 000 pcs

 

Chalenges / Specifics of the project

  • strict noise and vibrations limits
  • major restriction of blasting works
  • limited working area
  • site arrangement moving during excavation period
  • excavations in dense urban area under the main hospital
  • low overburden up to 30 m
  • use of electronic detonators

Photogallery