In construction lot H41, the southern sections of both the East Main Tunnel and the West Main Tunnel are being excavated using Tunnel Boring Machines (TBMs).
These TBMs are delivered in parts and assembled in designated assembly caverns. The TBM in the East assembly cavern has been named "Lilia," while the TBM in the West assembly cavern is named "Ida."
In June 2023, the TBM "Ida" commenced its southward excavation of the Brenner Base Tunnel, following the start of TBM "Lilia" in May 2023. The diameters of their drill heads are approximately 10 meters. Operating at a depth of about 1,000 meters below the earth's surface, they will advance the tunnel roughly 8 kilometers to the south.
At the southern ends of the NHS Innsbruck node, assembly caverns for the TBMs were constructed in the main tunnel bores at km 8.40 (East Main Tunnel) and km 8.15 (West Main Tunnel)
The continuous advancement in the main tunnel bores extends from km 8.48 (East Main Tunnel) and km 8.23 (West Main Tunnel) in a southern direction up to the sector boundary H41-H53 at km 16.58.
Technical data:
Boring diameter: 10,37 meters
Segmental lining inner diameter: 9,04 meters
Total length of TBM (incl. back-up train): approx. 160 meters
