Hochtief, Implenia JV to build suburban railway trunk route in Germany

WCN Editorial Team 3 Jan 2019 EUROPE TRANSPORT INFRASTRUCTURE

A joint venture comprising German construction firm Hochtief and Implenia has secured a contract from Deutsche Bahn (German Federal Railway) for the second trunk route of the suburban railway in Munich.

Under Implenia’s technical leadership, the joint venture will build the new rail line’s central Marienhof station.

The order is worth approximately €400m, with each company having a 50% share in the joint venture.

The second trunk route envisages an additional underground inner-city link, which runs almost parallel to the first trunk route in the centre of Munich, which opened in 1972.

The project covers around 10km and is designed to increase capacities on the busy route. Overall construction work began in 2017.

The future Marienhof station will be located in the heart of Munich, behind City Hall (Rathaus).

The station, beneath Marienhof square, will be built in an open construction pit, which in later stages will be covered by a concrete cap.

The new station will be constructed 40m below the surface because of the surrounding buildings and needs to be below the existing U-Bahn lines U3 and U6.

The 210m platforms will be located on the lowest level, beneath a 14m high concourse floor, followed by a mezzanine floor with the entrances and exits to the new S-Bahn station, in addition to access to the existing U-Bahn lines.

The platform areas beneath the surrounding buildings will be bored out from the tunnel.

Hochtief Infrastructure business unit manager of Civil Germany Riku Tauriainen said: “We are pleased to implement this sophisticated and demanding tunnel construction project on behalf of Deutsche Bahn in cooperation with Implenia.

“Together with our reliable partner, we are combining many years of experience and infrastructure construction expertise in Munich.”

Construction will commence later in 2019.

Implenia Infrastructure head of business unit René Kotacka said: “This complex infrastructure construction project with demanding special foundation engineering, tunnel construction and solid construction, requires highly specialized technologies and comprehensive know-how.

“We are delighted that Deutsche Bahn has awarded this contract to Implenia and the partner Hochtief.”

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Image: A rendering of the new rail line’s central Marienhof station. Photo: Courtesy of DB Netze.

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