The extension of the Metro B in Lyon achieves keys milestones
the different levels of the building are now completed and reveal impressive dimensions. The side panels of the central mezzanine have been completed, and the 13 meters high columns have been finished. The columns will remain in raw concrete and are already visible in their final form. We congratulate [...] Since leaving the launch shaft in November 2019, Coline has covered two kilometers, laid 1100 precast segments and excavated more than 500,000 tons of material, 50,000 tons of which is recycled directly on site, saving more than 2,000 truck journeys (seven trucks full time). There are still 400 meters [...] take turns working 24 hours a day, seven days a week. At the height of its activity, Coline digs at a rate of more than ten meters per day. The diverse and complex geology of the region is one of the many challenges of this project. The multi-density tunnel boring machine was designed to cut through a wide[...]