To build the new Triangle bridge, the best solution was to opt for a concrete-steel mixed structure. The new bridge is composed of a weatherproof concrete floor slab with acoustic insulation. Steel was chosen for the support beams due to its efficiency and for its aesthetic and economical properties. S460M steel is economically beneficial for that type of application. Indeed, the weight of the structure can be reduced with a low price increase, its carbon rate is very low and welding doesn’t require pre heating.
Hand in hand collaboration
Eurostructures in Luxembourg was chosen by the customer Eiffage TP to provide 32 metre-long HEB and HEM 600 beams. Eiffage TP is well-known for realising prestigious civil engineering structures (the Millau Viaduct, the Montparnasse tower, the Channel Tunnel …).
For the assembly, Eurostructures partnered with the team of Distribution Solutions (DSI) in Yutz, France. This Distribution Solutions team was in contact with the customer’s supervising office, checking compliance with the specifications:
- Accordance with the EN1090 standard (specific to steel structure/bridges)
- Accordance with EXC4 execution class (specific to special structures such as nuclear power stations and large-span bridges)
- Accordance with the ISO3834 standard which specifies the level of quality required for fusion welding