28/05/2025
Bessac: The Tunnel Boring Machine Reaches a Major Milestone on Toulouse Metro Line C!
The Toulouse metro has reached a decisive milestone with another success on section 4 of Line C: the tunnel boring machine Marguerite de Catellan has broken through at the Limayrac – Cité de l’Espace station. This project is led by the Horizon consortium (Bouygues Travaux Publics, Bouygues Travaux Publics Régions France, Solétanche Bachy France, and Bessac).
A Technical Feat Applauded On Site
The successful breakthrough at the Limayrac – Cité de l’Espace station adds to a series of key milestones: after passing through the Ormeau station last October, followed by the installation of the 1,000th ring segment in March, this marks another victory for the dedicated teams.
Local officials, nearby residents, and project professionals were present to witness the breakthrough live, emphasizing the significance of this moment for both the community and project stakeholders.
Target: 2025 – 4.2 km of Tunnel
The next stop will be Côte Pavée station, before the final arrival at the Saint-Sauveur shaft, scheduled for November 2025. This will mark the completion of the 4.2 kilometers of tunnel for section 4.
Each meter gained underground is a step forward toward the city of tomorrow. The tunnel boring machine Marguerite de Catellan’s breakthrough at Limayrac – Cité de l’Espace is not just a technical milestone — it’s a strong signal that the Toulouse metro is advancing with precision and passion.
Projects Certified with Ultra-Low-Carbon Concrete EXEGY® by Soletanche Bachy
As a reminder, as part of the Line B extension project, Bessac is producing all 2,850 tunnel lining segments using ultra-low-carbon concrete EXEGY® by Bessac, in collaboration with the materials departments of VINCI Construction and Soletanche Bachy. The result: a 40% reduction in CO₂ emissions compared to traditional concrete!
For section 4 of Line C, part of the diaphragm walls for the shafts were also made with EXEGY® ultra-low-carbon concrete.
