Reinforcement of the cladding and adaptation of the installations in the tube towards San Sebastián, in San Lorentzo-Larre tunnel (A-15 Motorway)

The works to be carried out in the San Lorentzo Tunnel consisted of carrying out the following actions:

1. Preliminary work: cleaning, excavation and scraping of the tunnel.
2. Supporting the tunnel and waterproofing projected using Mapei, Mapelastic TU System.
3. Installation of drains and asphalting the tunnel.

The tunnel has a length of 770 m and a section of 22 m2.