A consortium consisting of Austrian construction company Porr, its subsidiary Hinteregger and joint venture partners from Italy, has secured a €1bn design and build contract from Brenner Basistunnel Gesellschaft (BBT SE) for lot H51 Pfons-Brenner of the Brenner Base Tunnel, the largest tunnelling project in the history of Austria.
The joint venture partners from Italy are Società Italiana per Condotte d’Acqua and Itinera.
The contract for lot H51 Pfons-Brenner involves construction of a tunnel of around 18km.
Work will begin in early summer 2018, headed by Porr/Hinteregger, and completion is planned for 2024.
Porr CEO Karl-Heinz Strauss said: “To be charged with building the largest tunnelling project in Austria is a sign of how highly valued our expertise is.
“The scope of the project, the changeable geological conditions and the limited space constraints of the construction site all represent considerable challenges.
“On highly demanding, large-scale projects such as the ‘Green Line’ metro in Doha, we have proven that we are capable of mastering exceptionally complex tasks within the promised time and quality – and on budget. This certainly worked in our favour in the award process for the Brenner Base Tunnel.”
The construction phase for lot H51 involves the construction of two main tunnel tubes between Pfons and Brenner, around 9km of exploratory shafts, and the emergency stop and transfer point at St Jodok.
Two main, single-track tunnel tubes will be driven with tunnel-boring machines with an excavation diameter of 10.37m.
Each machine can be driven for a stretch of up to 30m per day.
The excavation of the exploratory shafts will be taken up with the drill and blast method and secured with shotcrete, and the entire lot will be supplied via a single access shaft.
Porr’s has so far driven more than 600km of tunnels and the group has already built multiple exploratory and access tunnels for the Brenner Base Tunnel.