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Nuremberg Underground Railway, Line 3 North, Contract Section 1.2, Maxfeld Station and Tunnel Sections

Contract section 1.2 of Underground railway line 3 increased the 27 km long Nuremberg metro network by a further 1.16 km. 2 single tubes now branch off from the existing Line U2 towards the north-west. They run below the Bayreuther Straße and dense built-up areas and open up the city's north-west with the Maxfeld Underground Station. Along the almost 1,160 m long section 1,300 m of single-track tunnel tubes with a 35 m² excavated area as well as a twin-track tunnel tube with an excavated area of 70 m² was produced by mining means. The approx. 180 m long station zone was constructed by cut-and-cover. The subsurface that was encountered consists of sandstone keuper rocks. Blasensandstein superimposed by Coburg sandstone had to be penetrated by the tunnel tubes. The Maxfeld Underground Station was produced by the drilled pile and top cover construction method as well as by cut-and-cover. The excavation pit was accessed via a ramp and was completely covered to avoid noise. It was used as the start-up shaft for the tunnel tubes produced by mining means. The single and twin tubes were excavated using the NATM with a short advance crown and in some cases, immediate floor closure. A roadheader was employed for excavating and securing purposes together with dry shotcrete. For this reason, sucking ventilation combined with a dedusting plant was required. The excavation had to be carried out at one side only on account of the large crown width in the section with the enlargement area for the twin-track tunnel and the track connection for the 2 single-track tunnels. A monorail system was used for operational reasons to remove the excavated material and to supply material to the drives in the single-track tunnel tubes. In this way, it was possible to concrete the follow-up floor parallel to the excavation. Vault concrete consisting of watertight B 35 was placed after driving was completed. In order to avoid vibrations resulting from moving Underground trains the mass-spring system was applied.

 

  • Country: Germany
  • Region: Bavaria
  • Tunnel utilization: Traffic
  • Type of utilization: Underground, urban and rapid transit
  • Client: City of Nuremberg, Foundation Engineering Office/ Underground Railway Construction
  • Consulting Engineer: Design: City of Nuremberg, Foundation Engineering Office/Underground Railway Construction; Execution: Köhler und Seitz, Müller+ Hereth
  • Contractor: Max Bögl Bauunternehmung GmbH & Co. KG, Bilfinger Berger AG, Ed Züblin AG
  • Main construction method: Trenchless
  • Type of excavation: Roadheader
  • Lining: Concrete formwork
  • No. of tubes: 1
  • Tunnel total length: Length of section 1,160 m, including 1,300 m of single-track tubes, 280 m of twin-track tubes and station
  • Cross-section: 35 to 95 m²
  • Contract Volume: € 26 million (Roughwork)
  • Construction start/end: April 2001 to March 2004