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Breitenfurt bei Wien, Austria

German Railways DB AG has awarded a contract to the joint venture Tunnel Eierberge consisting of the Austrian companies PORR, G. Hinteregger, Östu-Stettin and Jäger Bau for the design and construction of the Bad Staffelstein construction section. This 7.7 km long section is part of the new line from Ebensfeld to Erfurt and the core structure is the Eierberge Tunnel. The Eierberge Tunnel is a two-track rail tunnel with an excavated crosssection of 160 to 190 m2 and will be built with three emergency exits. The main tunnel and the emergency exits pass through the clay, marl and limestone of the Lower Jurasssic (Lias) overlain by Quaternary strata and lie entirely below the groundwater table. The 3.7 km long Eierberge Tunnel was driven by drill and blast with mucking by hydraulic excavator. The support was according to the principles of the ne Austrian tunnelling method. The tunnel was constructed on account of the prevailing water pressures of up to 6 bar with all-round plastic waterproofing membrane and inner lining of waterproof concrete. In order to comply with the provisions of a guideline that was revised during the construction period, an integrated system for subsequent grouting had to be designed and installed; this was used for DB for the first time in the Eierberge Tunnel. © 2012 Ernst & Sohn Verlag f?r Architektur und technische Wissenschaften GmbH & Co. KG, Berlin. Source

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