Ponte San Michele
Coordinates: 45 ° 40 ′ 56 ″ N , 9 ° 27 ′ 7 ″ E
| Ponte San Michele | ||
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| use | Road and Railway Bridge:
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| Crossing of | Adda | |
| place | Paderno / Calusco | |
| construction | wrought iron arch bridge | |
| overall length | 275 m | |
| width | 5 m | |
| Number of openings | a | |
| Longest span | 150 m | |
| Arrow height | 37.5 m | |
| height | 85 m | |
| start of building | 1887 | |
| completion | 1889 | |
| planner | Jules Röthlisberger | |
| location | ||
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The Ponte San Michele (also called ponte di Paderno , ponte di Calusco or ponte Rothlisberger ) is a combined road and rail bridge over the Adda gorge in the Italian region of Lombardy between the places Paderno in the province of Lecco and Calusco in the province of Bergamo . It is occasionally named after its planner, the Swiss engineer Jules Röthlisberger .
history
The bridge was built in the years 1887 to 1889 for the Seregno – Ponte San Pietro railway, with which the existing section from Bergamo to Ponte San Pietro to Seregno was extended, which enabled the connection to the Gotthard Railway . The bridge was built by the Società Nazionale Officine di Savigliano , whose chief engineer was Jules Röthlisberger. In the early 1980s it was completely renovated.
The bridge has been closed to road and rail traffic since September 14, 2018 to enable renovation work. After two years the bridge was about to be reopened. The maintenance work will enable the bridge to continue to be used by 2040 at the latest. In 2020 it became known that the bridge would be replaced by two new structures - a railway bridge and a separate road bridge. The new railway bridge is to be built immediately south of the existing one, so that the railway line on the Paderno – Calusco section does not have to be re-routed. The road bridge is to be rebuilt at a different location. The choice is severely restricted, however, as the structure is located in the Parco Adda nord protected area . In addition, the neighboring towns fear an increase in traffic if a new two-lane bridge with a higher load-bearing capacity is built.
description
The 275 m long, wrought-iron, two-story arch bridge resembles the Kirchenfeld Bridge in Bern , which was also built according to plans by Röthlisberger and completed in 1883. The model for both bridges was the Ponte Maria Pia in Porto, designed by Gustave Eiffel and Théophile Seyrig and opened in 1877 .
The Ponte San Michele crosses the Adda gorge at a height of 85 m, making it the highest iron railway bridge in Italy. It has a large, parabolic arch made of two trusses that are stiffened by cross braces and diagonal struts. In contrast to the Ponte Maria Pia, the arch is not hinged, but clamped. The arch has a span of 150 m and an arrow height of 37.5 m. On one side of the arch there are three pairs of truss posts and on the other side two pairs of truss posts that support the truss structure of the bridge girder. The single-track railway runs inside the bridge girder.
At the top of the 5 m wide bridge girder, the street is arranged with one lane and a narrow sidewalk on both sides. Vehicles may not be wider than 2.20 m and not heavier than 3.5 t. The speed is limited to 20 km / h. Traffic lights enable traffic alternately in one direction or the other.
Web links
Individual evidence
- ^ Thomas Fuchs: Jules Röthlisberger. In: Historical Lexicon of Switzerland . November 6, 2014 , accessed June 30, 2019 .
- ^ Ponte San Michele sull'Adda. Retrieved June 30, 2019 (Italian).
- ↑ a b Ponte San Michele, in pensione dal 2040 Due progetti per il nuovo attraversamento. In: L'eco the Bergamo. Retrieved July 21, 2020 (Italian).
- ^ Lorenzo Pallotta: Ferrovie: Ponte di Paderno d'Adda, ipotesi di sostituzione con due viadotti. Retrieved July 21, 2020 (it-it).
- ↑ The length was measured in Google Earth, since the lengths given in the various sources differ greatly from one another and are not compatible with the image in Google Earth.
- ↑ The catenary was of course known, but the parabola was much easier to calculate and gave almost the same results.
- ↑ Marcel Prade: Les grands ponts du monde . Première partie, Ponts remarquables d'Europe. Brissaud à Poitiers, ISBN 2-902170-65-3 , p. 319