Works description:
Construction of two entrance tunnels: Erribaso and Arizbakarra tunnels.
- Erribaso Entrance tunnel has a vaulted section in the stretch section (130ml) and the outbound stretch (94ml), and in the central stretch has poticoed section (125ml).
- Arizbakarra, Entrance tunnel has a vaulted section in the stretch section (248ml) and outbound stretch has porticoed section (160ml).
Three transitions with a length of 8ml have been constructed for section changes.
Works performed:
- In the stretchs with vaulted section were executed formwork and concrete works in foundations, walls, vaults and sidewalks.
- In the porticoed sections, were executed formwork and concrete works in the upper and lower slab and single-sided formwork and concrete lining of the piles of the walls.
In Erribaso tunnel 18,100 m3 of concrete.
In Arizbakarra tunnel has been poured 14,400 m3 of concrete. The execution of the vault was carried out with a own traveller formwork
Singular own resources:
- Own traveller formwork for entrance tunnels.
- Falsework for transitions formwork.
