en.Wedoany.com Reported - TELT (Tunnel Euralpin Lyon Turin), the binational company responsible for the Lyon-Turin railway, reported in its latest progress update that the Mont Cenis Base Tunnel project has achieved new milestones. At the CO5 work site in Villarodin-Bourget/Modane, France, the permanent lining of two ventilation shafts has been completed, while construction is underway on the third and fourth ventilation shafts. The first components of the new tunnel boring machine have arrived at the site.
This Herrenknecht gripper TBM, with a diameter of 10.4 meters and a total length of 334 meters, will excavate an 18-kilometer section of the two tubes of the Mont Cenis Base Tunnel, extending from the construction adit at Villarodin-Bourget/Modane on the French side to the Clarea underground safety station on the Italian side. At the same work site, excavation has also begun for the safety station access tunnel at the bottom of the construction adit.
In the direction of Saint-Jean-de-Maurienne, the TBM "Viviana," responsible for excavating the northern line tunnel from Saint-Martin-la-Porte to La Praz, has not yet reached its rated advance rate due to complex geological conditions in the mountain. This TBM was launched in September last year. In the same area, conventional excavation continues within the Saint-Martin-la-Porte and La Praz construction adits, covering the base tunnel, logistics galleries, cross passages, and the La Praz safety station.
At the CO8 tunnel entrance in Saint-Julien-Montdenis, France, both tubes are still being excavated using conventional methods. The installation of permanent lining in one of the tubes surpassed 1,000 meters this month. At the CO3/4 work site in Chiomonte, Italy, site platform construction is underway, including the installation of new secant pile walls for the entrance of the La Maddalena 2 exploratory tunnel, the first section of which will be excavated using conventional methods. The new platform will accommodate the TBM after factory testing.
Preparatory work for spoil disposal sites is progressing simultaneously. In Salbertrand, assembly of the ground structures for the spoil processing plant has begun. In Torrazza Piemonte, the supporting infrastructure for the conveyor system transporting materials to the disposal site is being prepared. In Susa, the site platform for receiving spoil has been completed, and related prefabricated components are currently being produced off-site.
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