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  Experience Gained at New Subway Line U5, Berlin – Presentation of the Stations

  The existing U5 underground line in Berlin currently ends at Alexanderplatz station in Berlin-Mitte. It is planned to close a gap of approximately 2.2 km in the section between the existing tunnels at Berliner Rathaus and Brandenburger Tor station. The line includes three new stations (Berliner Rathaus, Museumsinsel and Unter den Linden). Design and execution of the 3 stations hold, due to geology and surrounding, major technical and other challenges, e.g.: Diaphragm walls in combination with low-lying buoyancy-proof jet-grouting soles in a depth of up to 45 m, excavation of the platform tunnel in NATM underneath a river, protected by a sealing ice body of frozen soil around the cross section with little coverage to the river, directional drillings for soil freezing with a length of up to 105 m, measures to avoid or reduce settlements at sensitive existing structures along the stations, public relation measures to gain acceptance etc. Construction work started in April 2012.

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