Western Scheldt Tunnel - Ellewoutsdijk Terneuzen (The Netherlands)

The Western Scheldt Tunnel project originated via a PPP in a DBFM procedure, for which the consortium – to which Franki Construct belongs – was responsible for the design, maintenance, construction and financing of the project. Design, construction, financing and maintenance of the Western Scheldt Tunnel comprises: 2 bored tunnels, each 6.6 km long. 
The northern access ramp consists partially of an underwater concrete caisson and partially of a concrete bin. This bin is located in a construction pit consisting of anchored sheet piling and an underwater concrete floor anchored to tension piles. A two-sided water-resistant embankment was constructed around both access ramps. Around the southern access ramp, an approx. 1.5 km long cement-bentonite screen, with hung sheet piling, has been attached. This screen extends to a depth of approx. 28 m.
The works comprised:
  • 20 km of roads: equipped with noise barriers. 15 civil engineering structures: 9 viaducts, 2 bridges, 1 culvert and 4 piping vaults
  • One bridge is a 120 m long hanging through girder bridge for train traffic
  • Control building
  • Toll plaza, toll booths
  • 26 cross-members: freezing technique
  • Heat-resistant cladding: attached with a purpose-designed, automated spray robot
  • All technical systems required for controlling the Western Scheldt Tunnel. A few examples of this: traffic portals with traffic signalling; HVAC, plumbing, electricity supply to all buildings and plant rooms; control panel with monitors for the operators, incl. software; tunnel ventilation consisting of 80 fans; cameras; 166 aid stations in the tunnel; 2 automatic mobile metal guard rail constructions, each with a length of approx. 50 m
  • 10-year maintenance of the Western Scheldt Tunnel. 
  • Mobilisation: started on 14 July 1996; duration = 1 month; ended on 14 August 1996
  • Design: started on 15 August 1996; duration = 15 months; ended on 14 November 1997
  • Construction: started on 15 November 1997; duration = 6 years; ended on 14 November 2003
  • Maintenance: started on 15 November 2003; duration = 10 years; ended on 14 November 2013. 

Since 1998 Franki Construct has been part of Willemen Groep, the largest family construction group in Belgium.


Project Details

Westerscheldetunnelweg 1, Borssele, Zeeland, Netherlands
K.M.W. (Kombinatie Middelplaat Westerschelde)
End User 
Engineering Office 
K.M.W. (Kombinatie Middelplaat Westerschelde)
Construction period
6 years
Start work
End of work