Tunnel with a length of 453 m with an excavation section of some 84.47 m². Completed following the NATM, via blasting and mechanical means (backhoe) on fractured granite.

Tunnels with a length of 225 and 165 m with an excavation section of some 150 m². Excavation with blasting and mechanical means (backhoe) on flysch type rock (rocks-loams-sandstone).

Including a section of single lane highway, 2 km in length, whose main parts were: The Amaña and Katillu tunnels, 245 m and 185 m in length respectively. The Ego […]

Tunnels with a length of 446 and 305 m with an excavation section of some 135 m². Excavated via perforation and blasting slate and sandstone.

The section in the main has two parts: The first consists in widening to 4 lanes the A-8 both in the direction of Cantabria as well as in the direction […]

Two parallel tunnels with a length of 885 and 832 m with an excavation section of some 91 m². Excavated via perforation and blasting, applying the New Austrian Method of […]

Tunnels with a length of 487 and 105 m with an excavation section of some 100 m². Excavation took place on granite via perforation and blasting.

Construction took place on two sides of the road 10.5 m each (one each way, and a section type that had to 3.5 m carriageways (plus hard shoulders), a junction […]

These works consisted in the completion of a section of road 6620 m in length, with one carriageway in each direction. From a structural viewpoint, it included the completion of: […]