After a construction period of approximately 15 months, the last wall and ceiling elements of the Silltal Tunnel were concreted.
All tunnel structures in this construction lot have now been completed.
The Silltal Tunnel is a pre-tunnel to the actual Brenner Base Tunnel and forms part of the access route that connects Innsbruck main station with the Viller Berg portal.
The entire length of the tunnel is designed as a water-impermeable structure, which is also equipped with bituminous seals for walls and ceilings due to the long service life required.
The tunnel was built using an open construction method. To do this, the existing slope in the Sill Gorge first had to be removed and, due to challenging geological conditions, secured with five anchor beams and 133 prestressing anchors.
At the same time approximately 67,000 m³ of material was excavated.
Most of the material will be used for backfilling to restore the original contour of the site.
This work began in November 2023 and is expected to be completed in September 2024.
Approximately 13,720 m³ of concrete (including bored piles, excluding anchors) were used for the concrete work on the tunnel. The amount of reinforcement required for this is approx. 2,000 t.
