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Brenner Base Tunnel – Completion of Separation Walls in the Connection Tunnels
Sillschlucht-Pfons H41 Construction Lot
The separation walls in the Connection Tunnels East and West of H41 construction lot have been successfully completed, marking a significant milestone in the construction project. With an impressive length of approximately 2,280 meters in the East tunnel and about 3,600 meters in the West tunnel, these structures are key components of the Connection Tunnels.
The Connection Tunnels have a twin-cell cross-section, with a separation wall dividing the railway track from the escape route, thus creating two distinct sections within the tunnel, ensuring safety and functionality. The reinforced concrete separation wall is 50 cm wide and can withstand the impact of a train engine. The wall is fixed in the foundation and statically free from the tunnel’s inner linng in the crown. The average height above the foundation is 7.45 meters.
At regular intervals, openings are provided for the future installation of doors and hydrants. For construction logistics purposes, a total of five logistics openings remain in the separation walls of each connection tunnel, with varying lengths between 25 and 75 meters.
The Connection Tunnels East and West, with lengths of approximately 3,0 km and 4,2 km respectively, connect the two main tunnel tubes (East and West) of the Brenner Base Tunnel with the Inntal Tunnel (Innsbruck bypass), which leads to the Unterinntal route at Tulfes.
The Connection Tunnels East and West were already excavated by previous construction lots, and the inner lining (base slab, abutments and vault) has been completed. As part of H41 construction lot, the separation wall and the concrete slab of the escape route were added.
