Widening and safety upgrading of the A6 Turin–Savona Motorway between Fossano and Priero (Lot 6).

Project objective

The works constitute Lot 6 of the widening of the A6 Turin–Savona Motorway carriageway in the section between Fossano and Priero.
In addition to the executive construction design, throughout all construction phases our Company provided the contractor with technical assistance and geotechnical consultancy.

Main works

Branzola Viaduct
Comprising 18 spans with variable span lengths from a minimum of 17.0 m to a maximum of 35.4 m, for a total length of 516.2 m.
The viaduct deck is a prestressed reinforced-concrete structure built with precast girders erected by mobile crane.
The piers and abutments are reinforced concrete with hollow rectangular cross-section and heights ranging from 7.00 m to 46.90 m; located on a steep slope with high susceptibility to instability, they are founded on caisson foundations.

Ellero Viaduct
Comprising 8 spans with span lengths ranging from 65 m to 90 m, for a total length of approximately 601 m.
The viaduct deck, launched by incremental launching, consists of two CORTEN steel I-girders 4.4 m deep, connected by lower and upper bracing and vertical diaphragms to form a torsionally stiff box, with an in-situ reinforced-concrete slab.
The piers and abutments are reinforced concrete with hollow rectangular cross-section and heights ranging from 7.00 m to 46.90 m; located on a steep slope with high susceptibility to instability, they are founded on caisson foundations.

Bozzolo Viaduct
Built with a composite steel–concrete deck structure with a three-span continuous-beam static scheme, for a total length of approximately 211 m.
The deck consists of two CORTEN steel I-girders, 4.40 m deep and spaced at 5.00 m, connected by lower and upper bracing and vertical diaphragms, with an in-situ reinforced-concrete slab.
The piers, with hollow rectangular cross-section, are 28.50 m and 26.80 m high, with caisson foundations.