Joint venture contractors Acciona Ghella (AGJV) have said that production of the first precast concrete tunnel lining segments for Norway’s new Follo Line tunnel has got underway.
According to AGJV, the start of production is a key milestone in its work on the new 18.5km rail tunnel between Oslo and Ski.
In total 140,000 lining segments will be needed for the work which will create the longest rail tunnel in Scandinavia.
“We started test production in late May and have already produced several segments and complete rings in one of the production lines,” said AGJV project director Fernando Vara. “This factory is brand new and until now we have run different test and test production, but soon we are able to operate at full pace.”
The tunnel will be driven by four tunnel boring machines (TBMs) with two undertaking each bore. The first is already being assembled on site and the tunnelling work is expected to be completed in 2018.
“The first TBM is expected to start boring towards Oslo in September this year, and all four are planned to be operational by the end of the year,” said Vara. “Production of the concrete segments will continue until the last TBM has completed its bore.”