Sankt Gallen (CH)

Three tunnels are being renovated as part of the comprehensive overall renovation (UPlaNS) St. Gallen West – St. Gallen East.

Tunnel Rosenberg (TROS)

The Rosenberg tunnel is a twin-tube tunnel on the N01 motorway and was opened in 1987. In its current state, the tunnel is 1.44 km long and is equipped with a cross-ventilation system with concentrated smoke extraction (exhaust air slide) in the event of an incident. The two tunnel control centres at Olma and Hätteren are each equipped with 2 supply air fans. Concentrated smoke extraction is provided by 2 exhaust fans in the Hätteren ventilation centre.
The tunnel no longer meets current requirements in several respects and most of the systems have reached the end of their service life. A major refurbishment is planned from 2024. A ventilation system with concentrated smoke extraction and jet fans for longitudinal flow control is required. The supply air fans are to be replaced by the installation of longitudinal ventilation as part of the refurbishment. This takes into account the extension of the tunnel to approximately 1.6 km. The reason for the early changeover to longitudinal ventilation is the fact that a large section in the east can no longer be served by exhaust and supply air, and that the supply air intake at the east portal is no longer available due to the URO project.

Tunnel Stephanshorn (TSTE)

The Stephanshorn Tunnel is a twin-tube cut-and-cover tunnel on the N01 and was opened in 1987. It has a length of 570 metres and adjoins the Harzbüchel gallery to the west, which is open on one side to the north. The tunnel runs roughly in a W-E direction. The Rosenberg tunnel follows 1.5 km to the west in the direction of Geneva. The Lindental gallery (400 m), which connects to the Harzbüchel gallery via the Spinnerei bridge, is not relevant from a ventilation point of view. The tunnel is used by two-lane directional traffic.

Tunnel Schoren (TSCH)

The approx. 1.2 km long, twin-tube Schoren tunnel connects the N01 motorway with the St. Gallen city network and was opened in 1987. At each end of the tunnel, the tubes are divided into 2 ramps, so that the Schoren tunnel has a total of 4 entry and 4 exit portals. The tunnel is equipped with a longitudinal ventilation system. In various respects, the tunnel no longer meets current requirements and most of the installations have reached the end of their service life.

Main works

Rosenberg tunnel (TROS)

  • Dismantling and professional disposal of 4 supply air fans (Hätteren and Olma)
    Dismantling and professional disposal of 2 supply air fans incl. shut-off dampers (Hätteren centre)
  • Delivery, installation and commisioning of 4 exhaust air fans incl. shut-off dampers in the air handling centres (2x Hätteren + 2x Olma)
  • Supply, installation and commisioning of 16 jet fans for longitudinal ventilation
  • Delivery, installation and IBN of 30 smoke exhaust dampers and 2 separating dampers

Stephanshorn Tunnel (TSTE)

  • Supply, installation and commissioning of 8 jet fans for longitudinal ventilation

Schoren Tunnel (TSCH)

  • Dismantling and professional disposal of 2 exhaust fans
  • Dismantling and professional disposal of turning vanes
  • Dismantling and professional disposal of 27 jet fans
  • Delivery, installation and commisioning of 21 jet fans

Scope of supply

  • 2 horizontal hydraulically adjustable exhaust fans
  • 2 vertical hydraulically adjustable exhaust fans
  • 45 jet fans
  • Silencers
  • Exhaust air and separating dampers
  • Turning vanes
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Zitron Nederland B.V. is a company that occupies a leading position in the European market as a manufacturer of ventilation systems for railway and road tunnels. Zitron Nederland B.V. can justifiably call itself “Specialists in tunnel ventilation“.