We were responsible for the mechanical design of the power line supports for a new 400 kV extra-high-voltage overhead power line, as part of our NIMOS-CEGELEC-MAP3 consortium. We carried out the design work for the mechanical aspects of the project, from the preliminary design stage through to the production of detailed working drawings, including detailed calculations and bill of quantities.
Our concept is a new type of high-performance concrete pylon, 52 m in height, based on an original design comprising a tripod with curved arches and a conical vertical shaft, set on special reinforced and ballasted hollow foundations made of precast concrete.
The carbon footprint is low and close to the technical optimum represented by the standard steel lattice pylon. The supports for the electrical equipment are designed in Corten steel, utilising sheet metal fabrication techniques with variable sections featuring curved triangular walls.
The entire structure is suitable for industrial series production, with construction based on full prefabrication and special on-site assembly techniques.
The design is innovative in terms of the structure’s form and the use of high-performance concrete, ensuring exceptional durability of 100 years for a high-voltage line support.
Client: RTE
Consortium: Nimos Design, Cegelec, MaP3
Lead consultant for detailed design phase: MaP3
CFD studies for wind analysis: MaP3 Fluides
Materials: B90 high-performance concrete, prefabricated into hollow segments; post-tensioned using flat tendons; Corten steel brackets
