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Breakthrough achieved on Sweden’s longest rail tunnel

Construction work on Sweden’s Hallandsås Tunnel has reached a major milestone with breakthrough achieved on the second bore of the 8.7km tunnel.

Skanska and Vinci completed the work on the route for the Swedish Transport Administration, which was first started in 1992 by Kraftbyggarna but was halted after five years due to environmental issues.

STA brought in Skanska in 1996 but issues with high levels of water leakage containing levels of acrylamide above trigger concentrations led to the decision to halt the project and focus on decontamination and sealing the tunnel.

The joint venture was brought in to restart the work in 2005 and completed the first bore between Bastad and Forslov in 2010. The tunnels have been driven by tunnel boring machine through unstable ground formed of gneiss, amphibolites and dolerite and called for a 230m section of ground freezing to take the route through the water-bearing fissured Molleback zone.

The rail link, which will create a six fold increase in rail capacity between Malmo and Gothernburg, is now expected to be completed in 2015.

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