Pont Boutiron
Coordinates: 46 ° 9 ′ 13 ″ N , 3 ° 24 ′ 34 ″ E
| Pont Boutiron | ||
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| use | Road bridge D 27 | |
| Crossing of | Allier | |
| place | Creuzier-le-Vieux | |
| construction | Reinforced concrete arch bridge | |
| Number of openings | three | |
| Longest span | 72 m | |
| start of building | 1911 | |
| completion | 1913 | |
| planner | Eugène Freyssinet | |
| location | ||
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The Pont Boutiron (also Pont de Boutiron ) is a road bridge over the Allier in the district Boutiron the municipality of Creuzier-le-Vieux in the north of Vichy in Allier in the French region of Auvergne Rhône-Alpes .
It leads the départementale D27 over the Allier and connects the northern suburbs of Vichy with the town of Charmeil on the left bank of the river and the Vichy-Charmeil airport.
Traffic on the two-lane bridge is limited to vehicles up to 3.5 t.
The Pont Boutiron has three openings with spans of 67 + 72 + 67 m, which are spanned by three-hinged arches with an arrow ratio of 1/14 or 1/15, which is extremely flat for the concrete bridges of that time. The arch thickness is 50 cm at the abutment and 19 cm at the top. Truss-like triangular bracings on the arches serve as stands for the also very thin deck.
history
The Pont Boutiron replaced a suspension bridge built by Marc Seguin in 1856 .
The bridge built by Eugène Freyssinet between 1911 and 1913 is largely identical to his previous Pont du Veurdre and the later Pont de Châtel-de-Neuvre . When the Allier département tendered a stone arch bridge over the Allier near Le Veudre, François Mercier, a building contractor interested in the construction of the bridge, made the département the offer for the Pont du Veurdre and the bridges near Boutiron and Châtel at the estimated price of the stone arch bridge -de-Neuvre according to the Freyssinet system.
When building the bridge, Freyssinet drew the lessons from the experiences made at the Pont du Veurdre with the previously largely unknown creep and shrinkage of concrete. It was already too late to introduce any structural changes, but the arch vertices were designed from the outset in such a way that the two arch halves could be pressed apart with the help of hydraulic presses, the position of the vertices could be continuously corrected and the openings filled with concrete.
During the construction, Freyssinet had to struggle with the flood of the century threatening to bring down the falsework , which had already been dangerously pushed aside . However, he managed to push the falsework back into its correct position with hastily set up makeshift aids and with the presses provided for correcting the apex. For fear of the proverbial second flood in this area, he then had the concrete work carried out with all available forces day and night.
The bridge is still in remarkably good condition.
Web links
Individual evidence
- ^ A b Eugène Freyssinet en quelques ouvrages: Pont Boutiron sur l'Allier 1913 on the website of the Association Eugène Freyssinet
- ↑ Pont de Boutiron près de Vichy - 1856 on Art-et-Histoire.com
- ↑ Bernard Marrey: Les Ponts Modern; 20 e siècle. Picard éditeur, Paris 1995, ISBN 2-7084-0484-9 , p. 52
- ↑ La leçon de Freyssinet - L'homme sur la brèche (pont de Boutiron, 1911). In: L'Ingénieur-Constructeur, Revue technique mensuelle n ° 134, March-April 1969; Special edition on Freyssinet and prestressed concrete ( digitalisat PDF; 17.6 MB), p. 4 (7 in PDF)