Ponte del Risorgimento
41.91861111111112.470555555556Koordinaten: 41 ° 55 ' 7 " N, 12 ° 28' 14" E
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The Ponte del Risorgimento (or easier Ponte Risorgimento ) is a 1911 built bridge over the Tiber river in Rome. It is characterized by a very shallow, broad bow with a thin head. She was the first reinforced concrete bridge in Italy and had at its opening, the longest span of all concrete arch bridges.
The four-lane road bridge connects Piazzale delle Belle Arti in the Flaminio district on the eastern side of the river to the Piazza Monte Grappa in the quarter Della Vittoria. It is a one-way control to the west.
The bridge was in connection with the exhibition to celebrate the 50th anniversary of the Unification of Italy (Italian Risorgimento ) in the years 1909 to 1911 built by the plans of François Hennebique of its Italian licensee, the company Porcheddu from Turin.
The Ponte del Risorgimento, including the ramps 159 m long and 20 m wide. The overhead roadway is 13 m wide and is flanked by two sidewalks, each 3.50 m wide, including the parapet.
The reinforced concrete bridge has a single segmental arch with a span of 100 m and a sagittal height of 10 m. As a so-called clamped bow he has no seams or joints. The bow is at the apex only 20 cm, and 50 cm thick fighters. On the bow are longitudinally seven 20 cm thick walls ( including exterior walls ), which carry the also only 20 cm thick deck slab. This longitudinal walls are connected to each other partly by transverse walls, partly by concrete beams. The transverse walls have openings to allow the bridge inside can be committed. At the apex is between the vault and of the bridge deck a 45 to 55 cm high cavity is subdivided by the longitudinal and transverse walls. The cavities under the sidewalks have been used for the laying of pipes. As a result, the bridge is made of a multiple and divided stiffened arcuate hollow box, of the vertex has only a depth of 85-95 cm. The reinforcement is usually from half-round longitudinal bars with 18 mm diameter, at special points also semi-circular iron were used with 34 mm diameter. 5 mm thick wire is used to connect and fix the iron.
The arch is supported on the abutments on heavily reinforced transom. The abutment itself consist of different longitudinal and transverse walls forming a rigid cell system. These walls are established in their crossing points on stilts.
The falsework was also mounted on reinforced concrete piles and had such a strength that it also survived the collision with a river steamer.
Upon completion in the spring of 1911 various stress tests were made, including steam rollers with a total weight of 150 t, a landfill with sand and gravel, which was drenched by the rain, and soldiers with in associations 120-900 man and without lockstep crossed the bridge. All measurements made here were satisfactory, so that the bridge was opened to traffic in May 1911.