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Civil Engineering

Viaduc de Millau, France

Viaduc de Millau, France - In the area of the double piers, 14 complete ACS self-climbing units with telescopic working platforms were used.
Viaduc de Millau, France - The carriageway of the Viaduc de Millau is positioned on up to 245 m high hollow piers.
Viaduc de Millau, France - Flexibly-adapted working platforms provided safe working conditions for all personnel even for the varying pier cross-sections.
Viaduc de Millau, France - The complete enclosure provided optimal protection for site personnel.
Viaduc de Millau, France - The cable-stayed bridge carries the carriageway at a height of up to 245 m across the valley. The tops of the steel pylons reach heights of 345 m.
Viaduc de Millau, France - The difficult shape of the structure required the adjustment or special preparation of the formwork elements for each concreting section.
Viaduc de Millau, France - Shuttering time was reduced through the use of only one anchor position. Optimal concreting results were achieved by the construction crews by using steel formwork.
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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

Requirements

  • 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

Customer

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

PERI systems in use