Ponte del Risorgimento
Coordinates: 41 ° 55 ′ 7 ″ N , 12 ° 28 ′ 14 ″ E
| Ponte del Risorgimento | ||
|---|---|---|
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| use | Road bridge | |
| Crossing of | Tiber | |
| place | Rome | |
| construction | Reinforced concrete arch bridge | |
| overall length | 156 m | |
| width | 20 m | |
| Number of openings | a | |
| Longest span | 100 m | |
| Arrow height | 10 m | |
| start of building | 1909 | |
| completion | 1911 | |
| planner | François Hennebique | |
| location | ||
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The Ponte del Risorgimento (or simply Ponte Risorgimento or Risorgimento Bridge ) is a bridge built in 1911 over the Tiber in Rome . It is characterized by a very flat, wide arch with a thin apex. It was the first reinforced concrete bridge in Italy and when it opened it had the largest span of all concrete arch bridges .
The four-lane road bridge connects Piazzale delle Belle Arti in the Flaminio district on the east side of the river with Piazza Monte Grappa in the Della Vittoria district. There is a one-way street rule in a westerly direction.
The bridge was built between 1909 and 1911 in connection with the exhibition to celebrate the 50th anniversary of the unity of Italy (Italian: Risorgimento ) according to the plans of François Hennebique by its Italian licensee, the company Porcheddu from Turin .
The Ponte del Risorgimento, including the ramps, is 159 m long and 20 m wide. The overhead carriageway is 13 m wide and is flanked by two sidewalks which, including the parapet, are each 3.50 m wide.
The reinforced concrete bridge has a single segment arch with a span of 100 m and an arrow height of 10 m. As a so-called clamped arch, it has no joints or joints. The bow is only 20 cm thick at the top and 50 cm at the fighter . On the arch there are seven 20 cm thick walls in the longitudinal direction (including the outer walls), which also support the roadway panel, which is also only 20 cm thick. These longitudinal walls are connected to one another partly by transverse walls and partly by concrete beams. The transverse walls have openings so that the inside of the bridge can be accessed. At the apex there is a 45 to 55 cm high cavity between the vault and the roadway panel, which is divided by the longitudinal and transverse walls. The cavities under the sidewalks were used to lay cables. As a result, the bridge consists of a multiple subdivided and stiffened, arched box girder , which at the top is only 85 to 95 cm high. The reinforcement usually consists of semicircular longitudinal bars with a diameter of 18 mm, in special places semicircular bars with a diameter of 34 mm were also used. 5 mm thick wire is used to connect and fix the iron.
The arch is based on the abutments on heavily reinforced crossbeams. The abutments themselves consist of various longitudinal and transverse walls that form a rigid cell system. These walls are built on piles at their crossing points.
The falsework was also supported on reinforced concrete piles and was so strong that it withstood a collision with a river steamer.
After its completion in the spring of 1911, various stress tests were carried out, including with steam rollers with a total weight of 150 t, an embankment with sand and gravel that was soaked in the rain, and soldiers in units of 120 to 900 men with and without lock step crossed the bridge. All measurements taken were satisfactory, so that the bridge was opened to traffic in May 1911.
Web links
Individual evidence
- ↑ The term reinforced concrete has only been used since 1920.
- ↑ Inscriptions on the bridge.
- ↑ a b H. Marcus: The Risorgimento Bridge over the Tiber in Rome. Critical considerations about their constructive training and their static calculation. In: Armierter Beton, monthly for theory and practice of the entire concrete construction , year 1912, August edition, p. 294 f. (Continuation in the following editions on p. 341 and 360, 378, 416 and 470. Digital copy on the BTU Cottbus font server ; PDF; 8.5 MB).
- ↑ All technical information is based on the contribution by Marcus.