It is crossed by railway Civitavecchia-Orte-Capranica, closed to traffic since 1994.
In May 2014, the area around and beneath the bridge has undergone a profound reclamation by RFI.
Made in 1928 by the National Society of Officine Savigliano, who 40 years earlier had built a similar bridge over larger, has the distinction of being made up of parts hinged together, according to a isostatic. This project was chosen because of the compliant nature of the land according to the ingenious solution of the Swiss engineer Jules Röthlisberger who was chief engineer until 1911 (the year of his death) of the hard working Officine Savigliano. Project from the established success of daring and pioneering achievements of bridges, erected in the second half of the nineteenth century.
The Bridge Ronciglione is entirely riveted with rivets and does not use soldering. The portable machines for welding, especially those in the electrodes, it had begun to spread only after the First World War (1918). When the bridge was built, the technique of welding required mobile plants still too fiddly to be used in the artifacts in place, especially if such significant dimensions and positions little easier.
Local residents still remember, in memory passed down, the imposing wooden scaffolding of the yard, which also killed several workers, engaged in the construction of this arduous bridge.
The center span is made up of two parabolic arcs symmetrical and placed side by side, slightly inclined to each other that support the two pylons smallest of the four iron bridge. Straordinaramente this gigantic span made in a semicircle is not a single block but consists of two separate halves, only supported between them to buttress on two narrow central wedges, hinged at the highest point; in other words, the bridge is equipped with a kind of cushion that absorbs the mechanical and thermal stresses [1] caused by the passage of heavy trains and by termodilatazioni iron especially in the summer months, the structure avoiding the immediate risk of collapse, total or partial , very likely a danger to the static equilibrium structures, become too rigid and compact because blocked with redundant constraints (hyperstaticity).
The choice of a single-span bridge without supports central ground was favored both by the particular shape of the large throat, vertical and deep and will not implant ups and little structural pillars in the valley, crossed by the river Vicano.
It is one of nine bridges in the world of this type of construction arched iron Eiffel style, the only one in the world for mobile hinge.

http://it.wikipedia.org/wiki/Ponte_di_Ronciglione

photo : Flavio Di Mattia

assistant : Felice Urbena

photo: Zeiss 16-35mm
original size 25000x12500
www.abagontheroad.com