3D visualization of the future U2 station Pilgramgasse. Credit: Arch Mossburger.

A consortium of two Austrian construction firms, PORR and STRABAG, has secured a tender from Wiener Linien, the Vienna public transport provider, for the first phase of the connected construction project in Vienna.

Under the metro expansion plan, four new stations will be constructed as part of the redirection of the U2 line and nearly 7km of tunnel will be driven.

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The contract value for the consortium stands at around €500m, with each party’s share being 50%.

PORR CEO Karl-Heinz Strauss said: “This key infrastructure project definitively closes the gaps in the inner-city metro network for Vienna. With our decades of experience and exceptional technology knowhow in underground railway construction, we will play a key role in sustainably improving Vienna’s public transport infrastructure.”

PORR stated that this expansion of the inner-city underground railway network is a major milestone in the urban development of Vienna.

As part of the project, the U2 line between Rathaus and Karlsplatz will be integrated with U5, while the U2 will branch down towards the south of the city.

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The contract is part of the first phase of construction of the U2/U5 line expansion and includes the phases of U2/17-21, which consists of U2/17 driven by TBM, U2/18 Matzleinsdorferplatz station, U2/19 Reinprechtsdorfer Straße station, U2/20 Pilgramgasse station and U2/21 Neubaugasse station.

STRABAG chairman Thomas Birtel said: “Construction work in the inner-city is always a challenge in light of the cramped conditions. Drilling beside the facades of the nearby buildings requires a great deal of expertise and transport to and from the sites through the narrow alleyways surrounding Neubaugasse is exceptionally complex in terms of logistics.”

For the construction of the two tunnels in the inner-city area, the tunnelling team will work in shifts around the clock.

Around 3km will be bored using the New Austrian Tunnelling Method (NATM), while a tunnel boring machine (TBM) will be used for another 4km.

The consortium will autonomously render all of the works such as tunnelling, specialist civil engineering, railway construction and structural engineering.

Construction will commence in February 2021 and will run until the middle of the year 2028.

In October, a consortium of PORR UK and Aggregate Industries UK secured a £260m contract to deliver a modular track system for the High Speed 2 (HS2) project in the UK.

As agreed, the consortium is entrusted with the task to design and manufacture slab track segments for the high speed line.

Overall, the PORR consortium will deliver all tracks, excluding some special structures, for the line between London and Crewe.