Technical specifications

Scope of work

  • Tunnel for a gas pipeline
  • Length: approx. 4,050 m
  • Internal diameter: 3.0 m
  • start and target shaft
  • installation of the gas pipeline in the tunnel
    using the floating method and subsequent backfill grouting of the tunnel
  • extensive soil investigation

Construction method

  • TBM tunnelling using a Hydroshield (slurry shield)
  • Shield diameter: 3.6 m
  • Steel fibre reinforced segmental lining
  • Wall thickness 25 cm


  • Potklei (local type of clay)
  • Sands
  • Clays




General data

Ems-Dollard Crossing between Germany and the Netherlands
tunnel for a gas pipeline

Nederlandse Gasunie

Wayss & Freytag Ingenieurbau AG
in a joint venture

Construction period
June 2008 to September 2010

Construction costs
€ 45.7 million

Media / Supply
Cable tunnel
4,050 m
Construction Method
TBM tunneling using a Hydroshield (slurry method)
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