U-BAHN NUERENBERG

This article describes the tunnelling operations in the current extensions to the metro system in Nuernberg, Germany. One metro line is being extended north-east to the airport, starting underground but eventually rising to the surface. 3km and four stations of the new line were opened in May 1993. Construction is now concentrated in the Leipzigerplatz area, where an open-cut station is being excavated together with 750m and 566m tunnels from its ends. Considerable temporary road installation was required, to divert traffic round the 100m long station cut. The station walls were constructed by pile drilling to about 12m depth at 2.5m to 3.2m intervals round the perimeter. The resulting excavation has smooth sides, to which a thin layer of shotcrete is applied as a temporary finish. In the south tunnels, the top heading was excavated first, then meshed, bolted and dry shotcreted. Lattice arches were set at 1.0m to 1.2m intervals for immediate support. Then a second lift was taken, and the walls were supported. Special precautions had to be taken where the roof of the tunnel passed only 2.5m below the bottom of a swimming pool. The north tunnels are being driven separately. Superb ventilation is necessary, to handle with the dust generated by excavation and dry shotcreting.

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  • Corporate Authors:

    THE MINING JOURNAL LTD

    60 WORSHIP STREET
    LONDON,   United Kingdom  EC2A 2HD
  • Authors:
    • Smith, M
  • Publication Date: 1993-9

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 271-2,274
  • Serial:
    • WORLD TUNNELLING
    • Volume: 6
    • Issue Number: 7
    • Publisher: THE MINING JOURNAL LTD
    • ISSN: 0956-8700

Subject/Index Terms

Filing Info

  • Accession Number: 00663431
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • Files: ITRD
  • Created Date: Aug 24 1994 12:00AM