Pont Jacques Chaban-Delmas
Coordinates: 44 ° 51 ′ 30 ″ N , 0 ° 33 ′ 6 ″ W.
| Pont Jacques Chaban-Delmas | ||
|---|---|---|
 |
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| use | Road bridge | |
| Crossing of | Garonne | |
| place | Bordeaux | |
| construction | Lift bridge | |
| overall length | 433 m | |
| width | 34 m - 45.3 m | |
| Number of openings | 5, of which the middle can be lifted | |
| Longest span | 117.4 m | |
| Clear width | 106 m | |
| Clear height | 53 m | |
| building-costs | 156.8 million euros | |
| start of building | 2009 | |
| completion | 2012 | |
| opening | March 2013 | |
| location | ||
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The Pont Jacques Chaban-Delmas is a lift bridge running road bridge over the Garonne in Bordeaux in the Gironde in the region Nouvelle-Aquitaine in France . It is named after Jacques Chaban-Delmas , the former Prime Minister of France and former Mayor of Bordeaux.
location
The bridge is located about 3 km from the city center between the Pont de pierre in the old town and the Pont d'Aquitaine motorway bridge and connects the Bacalan and Bastide districts . That is why it was called Pont Bacalan-Bastide during the construction period and is sometimes still called that today. It is the fifth crossing of the Garonne in Bordeaux.
description
General
Since the bridge the passage of cruise ships to provide up to the city of Bordeaux, it was as Hubbrücke with a clear height performed by 53 m. This makes it one of the largest lift bridges in the world.
The road bridge has two bus lanes on both sides of its central axis, which are prepared for later conversion into a tram line . Two lanes for motor vehicles run alongside each, separated by a curb. On both sides, a 4.80 m wide footpath and cycle path, separated from the roadways, leads past the towers of the bridge. The bridge is therefore 34 m wide on the bank, but 45.3 m wide in the middle part. The deck of the bridge is slightly curved upwards in the longitudinal direction in order to achieve the required clearance height of 13 m when closed. The sidewalks and bike paths with their very low construction height have a significantly flatter curvature with the same clear height, which makes them easier to use, especially for disabled people.
The bridge is 433 m long in total. They are followed by the abutments and the access roads to the streets along the banks.
Technical details
The most striking part of the bridge is the middle, 117.4 m long and 45.3 m wide bridge panel between the four towers. It consists of a three-cell steel box girder with a 12 m wide and 3.6 m high middle and two trapezoidal side cells, the top chord of which is an orthotropic plate . The sidewalks and cycle paths are in turn supported by small box girders that are connected to the central box girder by long cantilever arms . The bridge panel, which weighs more than 2,400 t, is attached to ropes with a diameter of 76 mm, which are connected to concrete counterweights hanging in the towers via pulleys with a 4 m diameter in the top of the concrete towers, which are only slightly lighter than the steel structure. Therefore, relatively small electric motors are sufficient for the lifting process.
The 77 m high concrete towers have an approximately elliptical hollow cross-section. In addition to the ropes and weights, there are also lifts for the maintenance staff. The outer ends of the prescribed emergency stairs, seen in the longitudinal direction, are designed as spiral stairs behind glass, the nighttime lighting of which sets a clear accent in the context of the bridge's lighting concept.
A few meters in front of the towers are four concrete ship deflectors with a diameter of 18 m, which extend into the river bed and are intended to prevent the bridge from being damaged if a ship hits. Between the ship deflectors there is a clear width of 106 m for shipping.
Two of the towers stand on a common, 44 m wide concrete foundation that extends to a depth of 25 m and is secured there by bored piles.
Between each pair of towers there is an 11 m short, independent section of the bridge deck, which is only connected to the middle bridge panel as well as to the side sections by roadway crossings.
The two lateral sections of the bridge consist of a composite construction with a steel box girder with a similar cross-section as in the middle part, but with a reinforced concrete slab , instead of the orthotropic panel. The left, western section is 133.7 m long and is divided by a slim pillar into two openings with spans of 62.5 m and 71.2 m. The right, eastern section is 159.8 m long with two openings of 81.3 m and 78.5 m.
Operation of the bridge
It only takes 12 minutes to raise or lower the bridge board, but for safety reasons the bridge remains open for navigation for one to two and a half hours. A larger ship can no longer turn in the last few kilometers before the bridge, so it must be absolutely certain when entering this area that it can drive through the open bridge without any problems. Originally, 60 openings per year were expected, which, however, focus on the main season. The times of closure to road traffic are published on the Internet.
Project flow
Following the decision of the Bordeaux Municipal Association (Communauté urbaine de Bordeaux, since 2015 Bordeaux Métropole ) in 2002 and a limited tender for the planning and construction of the bridge as well as various changes to the submitted designs, a group of companies from the VINCI group received in 2006 and the Italian steel construction company Cimolai .
The design went back to Michel Virlogeux and the architectural office Sarl Architecture et Ouvrages d'art by Thomas Lavigne. The project was planned in the Egis-JMI office, a merger of the French EGIS group with J. Muller International . The lifting equipment was designed by Hardesty & Hanover, the New York office that specializes in moving bridges. Yann Kersalé was responsible for the lighting concept.
The actual construction work began in October 2009. Since there was practically no space on the banks to set up a construction site, the foundations of the bridge towers and the ship deflectors were prefabricated in dry docks further downstream and then towed to the construction site and lowered there.
The steel bridge deck was made ready for installation by Cimolai at the plant in San Giorgio di Nogaro at the northern end of the Adriatic Sea , divided into five sections. First, the different lengths of the two eastern side openings were stacked on top of each other on a barge , which was then towed through the Adriatic Sea, the western Mediterranean and the Strait of Gibraltar , past Portugal and across the Bay of Biscay into the Garonne to the construction site. There, the two parts of the bridge on the barge were rotated horizontally by 90 ° so that they were perpendicular to its direction of travel - in Cimolai's opinion the most tricky process of the entire bridge construction. With the help of high and low tide , they were then set down at their final positions by the barge. The same was done with the two bridge parts of the western section. Finally, the 117.4 m long and 45.3 m wide middle section was towed to the construction site on a barge. This part could not be turned on the barge. The (slightly shorter) lighter therefore had to be maneuvered across the river between the bridge towers and held there exactly until the bridge deck was also lowered in its final position when the tide came down.
The construction work was completed at the end of 2012. After extensive testing of the lifting mechanism, the bridge was officially opened on March 16, 2013.
Web links
- Photos of the construction process (period 2009-2010)
- Photos of the construction process (period 2011)
- Photos of the construction process (period 2012)
Individual evidence
- ^ A b c Pierpaolo Rossetto, Stefano Tonon: Il viadotto Chaban-Delmas a Bordeaux. ( Memento of the original from November 26, 2013 in the Internet Archive ) Info: The archive link was automatically inserted and not yet checked. Please check the original and archive link according to the instructions and then remove this notice. in: Strade et Autostrade , July 2013, on the Cimolai website (PDF).
- ↑ a b c d e f g h Spécial Pont Chaban Delmas. Issue No. 22, 2013 of the CuB, Journal d'information de la Communauté urbaine de Bordeaux (PDF)
- ↑ a b c d Le Pont Chaban-Delmas à Bordeaux. on ConstruirAcier.fr
- ↑ z. E.g .: Horaires de fermeture
- ^ Cimolai, Stabilimento di S. Giorgio di Nogaro
