New railway bridge, S.P. 47 section Pistoia – Montecatini T. km 1 + 415 (Italy)

The bridge is made up of a steel deck, according to a simple support scheme, formed by two main beams, of variable height according to a parabolic profile, connected to each other at the height of the lower platbands by means of crosspieces placed at a distance of 1.00m . The total span of the beams is 31.40m, with support points placed at a distance of 30m, while the distance between them is 5.70m; the beams have a minimum height at the support of 1285mm and a maximum height in the middle of 3510mm and are made of a welded composition with an upper flange 450x40mm, a lower flange 600x30mm and a variable thickness core of 30, 25 and 20mm. The running beams are made with HE400A merchant profiles, while those in correspondence with the supports are made in a welded composition of the PRS 300 * 25/340 * 20/300 * 25 type. The trellis of beams is completed with a 30mm thick sheet metal bolted to the crossbars, made integral with the above reinforced concrete box. by means of specific pegs. The support devices are in steel – Teflon with an inverted spherical cap, according to the type used at RFI. For the assembly, the launch of the tip was planned with the aid of a forearm