Rockfall protection, Egratz, at Passy

Rockfall protection, Egratz, at Passy


Mont Blanc motorway and tunnel (ATMB)


Start of work in 2012

Project description

  • RN 205 - Route Blanche d'accès au tunnel du Mont Blanc
  • Work was undertaken below a protection slab: a concrete energy-dissipation slab inclined at 35° was installed on a cantilevering steel framework.
  • Length: 100 m
  • Distance between energy dissipation supports: 3 m
  • Energy absorption: 2 700 KJ

Services provided

Complete project management mandate:

  • Scheme design (AVP) 
  • detailed design (PRO) 
  • construction contract development (ACT) 
  • verification of contractor designs (VISA) 
  • direction of the works (DET)
  • client representative for commissioning and handover (AOR) 
  • general coordination and programming of the studies and works (OPC)


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