Katzenberg tunnel

Underground Mining Traffic tunnel construction

twin-tube railway tunnel

Project data

Deutsche Bahn AG
Building Method
mechanical drive
Order sum
323.4 million EUR (as part of a consortium)
Period of implementation
January 2004 - January 2011
Diameter / Cross-section
98 m²

Sekretariat Untertagebau
+43 5556 7181-817

Deutsche Bahn trains have since 2012 been traversing the 9.4-km Katzenberg tunnel on the new four-track railway line between Karlsruhe and Basel at speeds of 250 km/h. The two 8,984-m underground tunnels were excavated using two EPB tunnel boring machines with an excavation diameter of 11.16 m. The construction was carried out using monocoque segmental expansion with a 60-cm shell thickness. The internal diameter is 9.60 m. The maximum thickness of the ground above the Katzenberg tunnel is about 110 m above the ridge. In the area of the north portal near Bad Bellingen, the tunnel was excavated under buildings at roughly 25 metres below ground level. Difficult geological conditions and high water inflows presented a major challenge to the implementation of this complex tunnel construction project. The two tunnel tubes running at a distance from one another of 16-26 m were connected at intervals of 500 m by connection tunnels with rescue locks. At the highest point, an 80-m-deep ventilation shaft with an internal diameter of 6 m was constructed for each tube.

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