Willemen Groep
Boerenkrijgstraat 133, BE - 2800 Mechelen
tel +32 15 569 965,
Western Scheldt Tunnel - Ellewoutsdijk Terneuzen (The Netherlands)
Industrial & logistics
Civil Engineering
Road construction
General roadworks
Asphalt works
Concrete works
Integral projects
Design & Build
Franki Construct
Special features
Geboorde tunnels, onderhoud gedurende 10 jaar. DBFM
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 
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. 
Franki Construct

Kartuizersweg 1
2550 Kontich (Belgium)
tel +32 3 821 16 80

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