PORR has secured the largest tunnelling project in Austria’s history – lot H51 Pfons-Brenner on the Brenner Base Tunnel, with a length of around 18km. The works will begin in early summer 2018, headed by PORR/Hinteregger, with completion planned for 2024. The contract cost is in the order of €1bn.
The construction phase for lot H51 involves building the twin running tunnels between Pfons and Brenner, plus around 9km of exploratory works, and the emergency stop and transfer point at St. Jodok. In total, about 50km of tunnel will be built.
The two main single-track tunnels will be primarily driven using TBMs with an excavation diameter of 10.37m – aiming for up to 30m progress per day per machine. The excavation of the exploratory works will be by drill & blast and shotcrete. The entire lot will be supplied via a single access shaft.
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PORR’s has already built multiple exploratory and access tunnels for the Brenner Base Tunnel.