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23.02.2012 11:59
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© publics.bg
Bilfinger Berger has won two major orders for the expansion of the public transport system in Berlin. The projects for the construction of a new underground rail line in the centre of the German capital and a link between the main station and the urban rail ring have a combined volume of approximately €230 million. Construction of the urban rail section will be carried out in a joint venture.
The urban rail line is one of the largest transport infrastructure projects in Berlin. The new U5 line will link the Alexanderplatz with the main station and connects the Brandenburg Gate to the existing section of the U55. The project, on behalf of Berlin's transportation authority, comprises the construction of two tunnel tubes approximately 1.6 kilometers in length along with framework construction work for a track-switching system and two new stations. The tunnel tubes will be built using the shield driving method which requires the use of a tunnel boring machine. The "Museum Island" station will be built using an underground excavation technique while the cut and cover method will be used for the construction of the "Unter den Linden" station.
For the new stretch of the S 21 which will connect the main station to Berlin's ring line in a north- south direction, a joint venture under the leadership of Bilfinger Berger will construct, on behalf of Deutsche Bahn, a trough structure and several tunnel sections using both the open construction and cut and cover methods. One of the technical challenges of the project is that the sections near the main station will be built beneath girder grids and connected to existing excavation pits with the help of pressurized air.
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