Denkendorf Tunnel: Relocating the A8 Motorway Lanes

Germany. At the end of August 2015 the DB Projekt Stuttgart–Ulm GmbH is embarking on relocating the lanes of the A8 motorway in order to build the Denkendorf Tunnel. During the initial construction phase it is intended to narrow and redirect the three lanes leading to Karlsruhe–Munich over a length of roughly one kilometre.

“As we are building the Denkendorf Tunnel by cut-and-cover, it is necessary to relocate the motorway in several construction phases”, says Christoph Jacobi, the DB Projekt manager for the Stuttgart 21 sections Filder with airport link and Filder to Wendlingen. Jacobi adds that “the six lanes will be available throughout the entire three-year construction period particularly during peak times”.

The new rail route between Stuttgart and Ulm, which runs in the Filder sector parallel to the Karlsruhe–Munich motorway switches from the north to the south side of the motorway at the Denkendorf service facility. The DB is building the roughly 770 m long Denkendorf Tunnel including a trough and supporting structures following the route in order to cross the motorway. In addition a rescue area will be set up at the tunnel’s east portal. DB has commissioned the joint venture Johann Bunte Bauunternehmung GmbH, Bad Bentheim, and Heitkamp Ingenieur- und Kraftwerkbau GmbH, Herne to build the tunnel. The contract is worth around 40 million euros.