New Construction of the Subway Line U5 in Central Berlin

Berlin Transport Companies (BVG) AöR Berlin, Germany
The project "gap closure U5" extends the traditional line U5 from Hönow via the Alexan­der­platz to the Brandenburg Gate and connects it with the U55 line to Berlin Central Station, which was opened in 2009. Over 150,000 passengers per day are expected on the Neubaus­trecke with their three new metro stations–a large project that improves the mobility and the quality of life of the citizens of Berlin.

The Berlin metro’s U5 line runs from Hönow in East Berlin to Alexan­der­platz in the city centre. A two-stage extension of the route was undertaken in order to connect the eastern areas of the city better to the city centre. The first section between the central station and the Brandenburg Gate, which is not connected to the rest of the rail system, was opened in 2009 as line U55. The second section - the gap closure between Alexanderplatz and the Brandenburg Gate underground stations - has been under construction since 2012. In addition to the construc­tion of two tunnels, the project includes a track-switching facility and three metro stations, Rotes Rathaus, Museuminsel and Unter den Linden.

diameter of tunnel boring machine
tunnel section

Even the basic conditions above the earth make it difficult to build special-purpose structures. Thus the tunnelling machine has to cross the Spree and the Spreekanal on both sides of the museum island, as well as buildings, historical foundations and the Humboldt­fo­rum under construc­tion. As a special feature, the tunnel is completed before the excavation pits for the stations are lifted. In this way, the water pressure to the tunnel and excavation area is reduced.

CDM Smith is recognised as a service provider for integrated solutions in tunnel construction with difficult technical challenges.
Georg Breitsprecher, Project Manager

CDM Smith has been contributing to the success of the project since 1995 – first as a construction site consultant and planner, and then, since 2010, as a geotechnical and tunnelling consultant for the detailed design and implementation. Our consulting services are based on a variety of civil engineering specialities such as jet grouting, diaphragm wall construction, ground freezing and compensation grouting. We are also responsible for geodetic and geotechnical measurement programmes in monitoring and evaluating the shield tunnelling process as well as soil improvement and structural deformation. Our services also cover soil management as well as soil and waste disposal alongside disposal supervision.

Our geot­ech­ni­cal consultancy services cover, among other things, special-purpose construc­tions such as jet-spraying, slit-wall construc­tion, foundation grounding and compen­sat­ing injection as well as geodetic and geot­ech­ni­cal measurement programmes for the monitoring and evaluation of shield drives. CDM Smith advises the client on soil management and soil and waste disposal and takes over the overall disposal control during construc­tion work.

We delivered demand-oriented, high-quality and timely.

Did you know?

For the section of the gap between the Marx-Engels-Forum and the Brandenburg Gate the tunnel-driving machine "Bärlinde" was used. Special technical challenges lurk in the sandy Berlin subsoil, in the form of larger boulders, old buildings as well as the challenges offered by the crossing of the Spree. "Bärlinde" was produced by Herrenknecht specifically for the Berlin site.

Project website U5
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