The viaduct over the Rabbi river is included in the section Km 1+930.59 and Km 2+141.67 of the new ring road system of Forlì, connecting the ring road East – Lot 3.
The work consists of a bridge over 3 spans of spans equal to 58.58, 94.30 and 58.20 m; it houses a road platform with a constant width of 10.5 m and two side curbs, on which a road safety barrier is mounted, with a width of 0.75 m; in addition to the curbs, there is a net space of 0.95 m used as a service sidewalk.

The structure consists of a grid of steel beams with two main beams arranged parallel along the development axis of the viaduct and by crosspieces orthogonal to the main beams with a regular pitch of about 5 m on which rests a roadway slab with a thickness equal to 21cm + 6cm of predalles. The two main metal beams have a double T cross section of variable height from 4 m (lowest value recorded in the span) up to 6.00 m (maximum value recorded in axis with the pile).
The bridge has 2 central reinforced concrete piers in which allow the Rabbi River to be crossed with the maximum span and two traditional reinforced concrete abutments.
The foundations of piers and abutments are made using 120 cm diameter piles with a length of 28 m for the abutments and 100 cm diameter piles and 30 m long for the piles.

The main structure has a total length of approximately 309 meters and consists of two separate decks. The first deck “(C0-P2” has a plan layout with a radius of curvature of 50.0m and develops over two spans of 34m + 52 m for a total length of 86 m. The deck “P2-C7” has a rectilinear route over 5 spans (58 + 42 + 39 + 48.5 +34 m) for a length of 222 m.
The platform has a total width of approximately 16m, divided into a central part of 7.00 meters wide for the BHLS, a cycle-pedestrian path 5.00 meters wide and 1 sidewalk 2.45 meters wide.

The 1.89 m high cross section is made by a metal box with four webs. Metal slabs lean on the upper flanges and have the function of permanent formwork for the rounding of a reinforced concrete slab 27 cm thick.
The connection between footings and slab is ensured by rungs. The reinforced concrete slabs located on the overhangs are made by prefabricated semi-slabs with concreting completely on site. The overhangs are supported by variable-height steel brackets located in correspondence of the standard struts and bridge parts.

The overall weight is approximately 2000 tonnes, of which 600 relate to the curved section alone.
Two laminated elastomer bearings are located on all the piers or abutments; the C0-P2 deck in correspondence of the alignments P2 and C0 on the curved internal side, has special anti-lifting bearings.

Railway highway viaducts over highway A4 and on railway line “TAV Milano-Torino” realized with continuous beam deck with composite section.

The designed viaducts are the following:

• 1st Lot: IV01 Cebrosa, IV33 SP Bianzè , IV53 SC delle Priore , IV59 Reccetto , IV70 Mosezzo-Casaleggio.
• 2nd lot: IV11 Malasetto, IV62 Biandrate-Vicolungo, IV66 Biandrate, IV67 Biandrate, IV72 San Pietro Mosezzo, IV80 South Agrate, IV82 Agrate North.

Road viaducts near Noghere highway interchange with continuous beam scheme and composite steel-concrete transversal section.

The deck width varies between 8 m (in correspondence with the interchange) and 19.80 m (for the widest viaducts).

Design of the circular piles in reinforced concrete cast in situ. The designed viaducts are the following:

• Lot 1 Svincolo delle Noghere: Opera 1 e 3, Opera 2 e 4, Opera 5, Opera 6 e 6 bis
• Lot 2 Nodo di Lacotisce: Opera 7, Opera 8, Opera 9, Opera 10, Opera 11 e Opera 12

The Bonneville motorway viaduct consists of a girder deck in a composite system, simply supported over a span of 44 m. The 8 beams that compose it are coupled two by two, by means of I-section crosspieces 700 mm high.

The insertion of the structure in a zone strongly constrained by the interfering roads, imposed severe limitations on the heights of the beams ( Hmax = 1.1 m) , an aspect that led to thick flanges (maximum thickness 80 mm) and consequently required the imposition of important cambers (300 mm for the external beam on the “Macon” side).

Composite steel concrete road viaducts with continuous beam static scheme of:

• 11+12 spans (span length of about 40 m) and total length 920 m for Viadotto Grange
• 10+11 spans (span length of about 40 and 60 m) and total length of 860 m for Viadotto Inverso.

Transversal section is 14.60m-wide with a carriageway 10.6m-wide and 2.05m-wide curbs.

The viaducts are seismically insulated and lay on circular piles and traditional abutments. The foundations are deep.

Final detailed design of continuous girder viaduct in composite steel structure 140 m long (2 ways, spans length 40 m + 60 m + 40 m, constant radius of 130m).

Final detailed design of the piers and abutments in reinforced concrete. Design of the surface foundations of piers and abutments.

The viaducts transversal section is 10.80m-wide with a 9m-wide carriageway and two 1.80m-wide curbs. The piers are circular in section and the foundations are shallow.

The Viaduct on “Rotatoria 1” has a deck with a constant width of 19.8 [m], and it is composed by two carriageways of 8.25 [m] realized with 4 composite I-beams (1.6 [m] height) in a composite steel-concrete system with static layout of a continuous beam with 9 spans, span equal to 27.5 [m], for a total length of approximately 247.5 [m].

The Viaduct on “Rotatoria 2” consists of an upper deck with an 11.1 [m] platform and a 9.60 [m] roadway supported by 3 beams of 2 [m] height in composite steel-concrete I-section with a static layout of a continuous beam with 6 spans, spans equal to 28 [m] in the two side spans and 40 [m] in the four central spans, for a total length of approximately 216 [m].

The railway overpass has a deck with an 11.5 m roadway made up of 9 juxtaposed beams 1.25 [m] high in a composite steel-concrete section with an isostatic arrangement over a span equal to 43 [m].