Val Varuna Tunnel II

Renovation Val Varuna Tunnel II

The Val Varuna II railway tunnel, which went into operation in 1910, is located at an altitude of approximately 1,355 metres above sea level and extends over a length of 147 metres on the Bernina line between St. Moritz and Poschiavo in the canton of Graubünden.

  • 147 Meter long railroad tunnel
  • 13 Million CHF
Due to its many years of use, comprehensive rehabilitation in conjunction with widening is necessary. Since the tunnel must be available for rail traffic during the day, the work can only be carried out during nighttime closure periods.

The existing natural stone vault of the tunnel will be completely demolished and widened by means of pipe umbrella tunnelling while maintaining the same alignment. The new tunnel profile will receive a foil sealing and a reinforced shotcrete inner vault.

Special features: Demolition of the two portal structures and new construction with natural stone cladding; planning, production and exact laying of around 90 pieces of invert and carriageway slabs as well as planning, production and installation of an around 20m long auxiliary bridge in the area of the Cadera opening section to ensure accessibility.

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