Germany

Boßler Tunnel: TBM commenced Building the second Tunnel Tube

The TBM on the Aichelberg construction site prior to tackling the Boßler west tube Quelle/credit: Arnim Kilgus
The TBM on the Aichelberg construction site prior to tackling the Boßler west tube
Quelle/credit: Arnim Kilgus

Käthchen, the tunnel boring machine (TBM), which the DB Projekt Stuttgart–Ulm GmbH is using to drive the Boßler Tunnel on the new Wendlingen–Ulm rail route, embarked on its second shield passage on April 18, 2017. The 11.39 m diameter cutting wheel began tackling the roughly 8800 m long west bore from the Aichelberg portal. In similar vein to the parallel running east tube, which was accomplished in November 2016, the 110 m long and 2480 t heavy tunnelling machine will install some 4400 tunnel rings comprising roughly 30 800 precast concrete segments. “Together with the contractor we had the...

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