Montpellier TGV Railway Station

 

The southern French city of Montpellier enjoys an average of 2’618 hours of sunshine each year. Now, thanks to the perforated roof made of Ductal® Archistructure on the new high-speed (TGV) train station, the sun will be there to welcome travelers as they benefit from greatly reduced travel times between other major French and Spanish cities.
 

Description

The first TGVs left from Montpellier station in mid-2018, carrying passengers to Paris, Lyon and Barcelona, from platforms landscaped to reflect the natural inspiration of the entire project. Designed within the Project Oz: Nature Urbaine (urban nature) project, which aims to fill a 350-hectare urban area with green space as well as housing, offices and transport links, the station design incorporates nature-inspired elements both inside and out; from the platforms to the garden parvis.

 

Optimization

Architect Marc Mimram has also drawn inspiration from the Mediterranean surroundings in the inclusion of a perforated Ductal UHPC roof, which will filter direct southern light into the station. The roof is made of 115 precast modular Ductal® palms. Each unit is just five centimeters thick, but over 18 meters in span, made possible by the strength and durability of Ductal® UHPC even in very thin panels. They are perforated in a random pattern, following the passage of the sun throughout the day.

 

Challenge

Major Ductal® execution challenges concerned among others, the control of the fresh UHPC rheology for concreting, controlling the fiber orientation and precision of the tendons location, ensuring absence of cracking during demoulding and transportation phases (before post-tensioning), and geometrical control of the final palms installation (+/- 2 mm tolerance for the bearing points). All roofing elements (10,000 m² in total) were prefabricated within 4 months and installed with tight geometrical requirements in only 2 weeks. Whatever weather might be, a Ductal® roof ensures it’s always sunny in Montpellier!

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