The Salini/Technimont/SELI JV has been awarded the contract to build the 15.5km of twin tunnels and 17 stations on the US$3.8bn Copenhagen Metro City Circle Line. Construction is due to start next year with completion scheduled for 2018 (City Circle Line denoted by the Blue and Orange lines on the map).
The tunnelling will involve approximately 14.9km of 4.9m i.d. twin tunnel using TBMs; variable diameter twin tunnel and caverns using sprayed concrete lining; and cut and cover tunnel and ramp works.
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The TBM construction will be primarily through the Copenhagen limestone at depths varying from approximately 15m – 35m.
The design for the SCL tunnels is based on the sequential excavation method, using shotcrete with or without steel fibres, in conjunction with rock bolts and lattice girders to provide initial support for the tunnel. The SCL tunnelling will most probably be used for one bifurcation for each tunnel and for cross over caverns. SCL tunnelling could also be used for the running tunnel between the Sønder Boulevard Bifurcation and København H.
Three other JV originally tendered for the works, they were: the ALPINE Bau/FCC Construcción JV; the Bilfinger Berger/Vinci Construction Grands Projets/Per Aarsleff JV; and the MT Højgaard/Hochtief Construction/Ed. Züblin/E. Pihl og Søn JV.
CEO of the client, Metro Company, Henry Plougmann Olsen said, “I would like to thank the bidders for a great partnership and a constructive negotiation process. Now we have reached a milestone in the City Ring Project. We look forward to getting started, so we can give the capital a cohesive metro, which will bind the city together.”