Patrick Reynolds, Freelance Journalist
- Three remaining shortlisted JVs for the Cityringen tunnelling contracts for Copenhagen's central metro loop have all submitted tenders for each of the two main packages as well as a bid for both packages combined.
Copenhagen Cityringer metro route with the North and South Contracts divided at the Aksel Møllers Have station on the west and the Øster Søgade shaft on the east.
- Metroselskabet, the Danish client developing the entirely underground twin-tube project, said that confidential negotiations have started with the bidders and that it expects to award the tunnelling contracts for the 15.5km metro loop in the third quarter of this year.
- The three bidding JVs are:
• MT Høgaard with Hochtief, Ed Züblin and E Pihl & Son
• Salini Costruttori with Tecnimont and Seli
• Alpine Bau with FCC Construccion
- Last year four consortia were shortlisted to tender for the tunnelling packages but in February the JV of Bilgfinger Berger, Per Aarself and Vinci pulled out.
- Divided into North and South excavation packages, the project includes 17 box stations (each a standard 62m long), five shafts, four crossovers and stub tunnels for further planned extensions to the capital's metro network. The line is to come into service in 2018.
- The city's geology comprises glacial moraine on top of limestone. Sand beds are also a feature of the alignment, especially in the north west of the city. The running tunnels are to be driven by EPB or slurry TBMs at depths of between 15m and 35m. While the diameter of the tunnels has not been stated, the first metro lines (M1 and M2) had an inner diameter of 4.9m.
- Following studies that commenced in 2003, development work on Cityringen started in 2006 with early consultant support for the civil works on the project then provided by Cowi, Arup and Systra. During that process the client was also re-constituted from the original owner, Orestad Development Corpotation, which has a wider infrastructure brief, to the more metro-focused Cityringen organisation.
- Cityringen is the fourth stage of the progressive development of the metro network in Copenhagen, the first three having opened between 2002 and 2007. The existing network is a combination of surface and tunnelled stretches, and extends in a Y-shape across the city to support the M1 and M2 train services.
- When Cityringen is completed, the new M3 and M4 train services will operate on the underground loop. Like the existing services, the trains will be driverless.
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