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Viaduc de Millau, France

Project data

Location: Millau, France

Motorway bridge over the Tarn in Millau and longest cable-stayed bridge in the world

  • construction period: 2001 - 2004
  • construction: cable-stayed bridge
  • construction method: bridge as a steel box superstructure using an incremental launching method
  • eight-section bridge with a length of 2,460 m
  • highest piers: 343 m with steel structure
  • seven reinforced concrete piers from approx. 78 m to 245 m
  • cross-section change from single to double piers, 90 m below the superstructure

Architect: Sir Norman Foster


  • production of concrete piers with smooth surfaces and variable component geometry, with sharp-edged corners, without visible formlining joints within the individual concreting steps
  • a small amount of defined tie positions
  • concreting height of approx. 4 m with a fresh concrete pressure of 100kN/m²
  • high French safety standards


Eiffage TP Neuilly-sur-Marne, France

Customer's benefit

  • concrete surface created with the required geometry modifications
  • keeping to the required climbing cycle of 3 days
  • reduction of crane capacity despite the variable geometry of the structure
  • adhering to the strict French safety regulations
Jean-Pierre Martin | Phillippe Blondeau
Senior Project Manager | Quality Assurance

For this type of construction, the right choice of formwork and climbing systems is the key to success. PERI has proven itself to be an extremely competent partner and the company´s huge project experience together with its tremendous commitment to the project has contributed greatly to the fact that we are ahead of schedule!

The results that we could achieve with the ACS self-climbing system have completely fulfilled our expectations. While taking the extremely complex geometry of the structure into account, we could produce a concrete surface of the highest quality.

PERI solution

  • specially assembled special steel formwork with just one tie in the concrete and another tie over the concrete
  • only one tie position in the individual concreting steps, second position above the concrete joint
  • ACS self-climbing formwork for the outer side of the pier with a total of 196 ACS-R brackets
  • adaptable formwork elements for every cycle with specialised compensation and filler elements as well as telescopic steel walers
  • training wall with ACS R to prepare the climbing teams
  • special design to allow the creation of precast elements for the roof of the toll station