The assignment includes most of the design needed for 5.5km of tunnels close to the city centre of Oslo, 4km of which is for high-speed rail traffic.
The Follo Line, which will connect Oslo with the city of Ski in the Follo district, will be the longest tunnel system in Norway. It will have a total 20km and trains will run at up to 250 km/h, serving an estimated 150,000 passengers daily after its completion in 2021.
Condotte working engineering procurement and construction contractor for part of the line and the end client is the Norwegian National Rail Administration. The tunnel will be excavated using 'drill and blast' and 'drill and split' methods. All engineering will be carried out using building information modelling (BIM). Project challenges include existing underground facilities and the relocation of an underground river, the Alna.
"This is the first large transportation engineering assignment we have won in Norway. Our experts in Norway and Finland are working jointly to tackle the challenges of the assignment in an innovative and reliable way that is characteristic to our work," says Mikko Inkala, president of infrastructure design at Pöyry.
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