Renovation of tunnels Nouvetra operates across the whole of France for rail, road, autoroute and river tunnel renovation works. The workforce is highly skilled in specific and innovative techniques and carries out works on structures in service, fully halted, at short time intervals or with signaling. Nouvetra pilots major and technically complex sites thanks to its know-how / expertise and its efficient supervisory services. mastered techniques ; underpinning ; hydro-stripping / hydro-demolition (HPT) ; repointing ; reinforced concrete shells or fibre reinforced concrete shells ; injection of bonding matter, reactivation and land reclamation ; injection of resin ; drainage, treatment of water inlets, impermeability ; building of recesses and bypasses ; sanitation ; structure strengthening ; lowering of platforms. Have a look at the rehabilitation of the Marceau Drain system (Paris) and the renovation of Sommery Tunnel (Rouen).