Saint-Martin-la-Porte site
DECLINE AND BASE TUNNEL | 14,7 KM | WORK IN PROGRESS
After a first phase of activity between 2003 and 2010, the work is resumed from 2015 for the excavation of the second descent. From summer 2016 until September 2019, the TBM Federica dug 9 km in the axis and diameter of the south pipe of the base tunnel.
Progress
The construction of the 9 km-long geognostic tunnel, with the traditional 1.5 km-long section digged into the carboniferous fault, has made it possible to gain a better understanding of a geologically sensitive area in view of the final works.
How the works are carried out
The TBM boring this tunnel was designed to tackle certain specific geological characteristics of the area. Made in France, at the NFM Technologies facility in Creusot (Saône-et-Loire), it is fitted with an 11.26-metre-diameter head that holds 76 cutters and has a power of 5 Megawatt, the equivalent of 8 Formula 1 engines. The TBM’s average progress was 100 mm per minute.
TELT, while maintaining the leadership of the project, entrusted the work to a grouping of enterprises that includes six companies – three French and three Italian – specialising in public works, led by Spie Batignolles TPCI. Between the grouping of companies, the contractors and the subcontractors, the construction site employed 480 people.
Data key
8.700 m of tunnel to excavate with the TBM
+4.000 visitors until 2019
1.3 millions of rocks to be excavated
480 people employed during peak phases
News from the sites
10.5 km of France-side base tunnel completed
With the 10.5 km base tunnel completed on time and on budget TELT presents Mission-S, the programme to improve safety at work.
Axel arrives in Chiomonte
The CIM 4.0 competence centre has created for Webuild the first autonomously-guided robot to safely explore the deepest area of the gallery.
The multimodal interchange hub in Saint-Jean-de Maurienne will become operational in mid-June
Above ground and underground works are in progress in France and Italy.
A new major construction site for the Lyon-Turin base tunnel
Mission-S: TELT and companies sign pact for accident prevention and workers’ health