Lot H52 "Hochstegen"
Work on this construction lot began in February 2022 with the establishment of the construction site area at Wolf.
Lot H52 "Hochstegen" in the municipality of Steinach am Brenner is part of the former, newly designed lot H51 "Pfons-Brenner". This previous project section was divided into different construction lots in order to ensure the fastest and most efficient continuation of the work in terms of rapid overall project progress. The Wolf access tunnel is being used for the main development.
The Hochstegen lot is located in a fault zone characterized by an extremely complex geology. Over a length of around 500 meters, water-bearing, carbonate rock strata predominate. Tunnel boring in this zone is therefore particularly challenging. The contract for the construction work in section H52 "Hochstegen" was awarded to Swietelsky Tunnelbau GmbH & Co KG on December 15, 2021. The bid amount is around 102 million euros, and the construction period is estimated at 23 months.
The core of the project is the driving of the exploratory tunnel to the south through the so-called "high-level zone", with driving in this area taking place under the protection of advance sealing and securing injections.
The work mainly comprises the following structures:
1.2 km of exploratory tunnel to the south
2.6 km main tunnel in the direction of Brenner
0.6 km connecting tunnel
5 cross passages
2.5 km remaining excavation of the overpass at the Wolf South junction
BBT Tunnel Welten
The BBT Tunnel Welten extend over two levels on an exhibition area of around 800 m². The complex, exciting topic of tunnel construction, as well as many other aspects that play an essential role in this project, are explained in the Infocenter in a diverse and at the same time comprehensible way.
Since July 2021, more than ten additional exhibits have offered interesting facts about the construction of the Brenner Base Tunnel and invite interested visitors to explore the project interactively. The new highlights include a rail technology display tunnel showing the equipment of the future rail tunnel under the Alps as well as a rail simulator in whose locomotive driver's cab you can travel between the Brenner Pass and Innsbruck. In the outdoor area, a gigantic drill head of a tunnel boring machine impresses, illustrating the dimensions of these tunnelling driving tools.
Photos: © BBT SE