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  Experience Gained at New Subway Line U5, Berlin Presentation of the TBM Tunnel

  The existing U5 underground line in Berlin currently ends at Alexanderplatz station in Berlin-Mitte. It is planned to close the gap of approximately 2.2 km in the section between the existing tunnels at Berliner Rathaus and Brandenburger Tor station. The line is set to run through downtown from the new Berliner Rathaus station to be built below the Spree, underneath the future Berlin Palace and the Spree Canal, and along Unter den Linden to Brandenburger Tor. The line includes three new stations (Berliner Rathaus, Museumsinsel and Unter den Linden). Two parallel tunnels, each approximately 1.6 km long, are to be built using a slurry pressure balanced TBM. The passage under the retaining walls of the banks of the river Spree, integration with the construction of the future “Berlin Palace”, and the link to the existing Brandenburger Tor station present major challenges in terms of the design and execution of the shield tunneling. Construction works started in April 2012.

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