Underground Civil Works

Arnotegi Tunnels, Bilbao South By-pass

Owner: Diputación Foral de Bizkaia

Client: Interbiak

Lot 9-A Peñaskal-Bolintxu of the South Bilbao Bypass. Joint venture Works. It includes the Arnotegi twin road tunnel with a total length of 1,760 meters per tube, average excavated cross-section of 115 m2. The project includes 8 connection galleries (214 meters) of 33 m2 cross-section and 112 meters of technical rooms 62 m2. Excavation method: drill & blast. Rock type: Marl and limestone.