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  The return of TBMs to Norway at Røssåga HEPP – TBM operation through extremely hard rock, unstable rock mass and other challenges

  The breakthrough of the TBM at the Røssåga HEPP on 10 December 2015 signaled that the first TBM breakthrough in Norway in more than 20 years was a fact. The Robbins TBM was delivered as an Onsite first time assembly (OFTA) in January 2013 and was ready to bore less than 11 months from when the contract was awarded. During the excavation the TBM encountered extremely hard rock (over 280 MPa), which posed an extreme challenge for both the TBM and the cutters. During the excavation a highly efficient main bearing replacement was also performed in the tunnel. Even though the project encountered some challenges the TBM performance increased steadily to a level of about 200m/week towards the end of the project. After completion, the TBM was walked back through the tunnel and disassembled at the surface.

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