Noirmoutier Bridge
The Noirmoutier Bridge (French: Pont de Noirmoutier) is a bridge located on the west coast of France in the department of Vendée, built in the early 1970s to connect the island of Noirmoutier to the mainland. Before it opened, a maritime shuttle service ran between the La Fosse pier on the island and Fromentine pier on the mainland.
Noirmoutier Bridge Pont de Noirmoutier | |
|---|---|
 The Noirmoutier Bridge seen from the Fromentine ferry terminal (Noirmoutier is on the right). | |
| Coordinates | 46°53′30″N 02°08′59″W |
| Carries | Motor vehicles, pedestrians and bicycles |
| Crosses | Strait of Fromentine, Bay of Biscay |
| Locale | Vendée, Pays de la Loire |
| Begins | La Barre-de-Monts (mainland) |
| Ends | Barbâtre (island) |
| Owner | Vendée Departmental Council |
| Characteristics | |
| Design | Box girder bridge |
| Material | Prestressed concrete |
| Trough construction | Hollow-core slab |
| Total length | 583 metres (638 yd) |
| Width | 13.5 metres (14.8 yd) |
| Clearance above | open |
| No. of lanes | 2 |
| History | |
| Constructed by | Dumez and Sacer (structural work), Freyssinet International (prestressing), Bureau Veritas (testing) |
| Construction start | 1969 |
| Construction end | 1971 |
| Opened | 7 July 1971 |
| Inaugurated | 7 July 1971 |
| Replaces | ferry service |
| Statistics | |
| Toll | removed 1 July 1994 |
| Location | |
Description
The bridge connects the towns of Barbâtre, on the south of the island of Noirmoutier, to La Barre-de-Monts, on the north-Vendée mainland coast, and crosses the Strait of Fromentine.[1] Built by the Dumez and Sacer companies under the project management and financial direction of the department, its first stone was laid on 12 May 1969 in Fromentine and it was opened to traffic on 7 July 1971, in order to provide a replacement for the passage du Gois (a submersible roadway at high tide).[2] An enamel plaque was placed at the top against the railing to recall the event.
In 1977, an increase in the toll rate led to demonstrations by island users, with traffic blockading the entrances to the bridge, raising of barricades and the intervention of a company of CRS in response. The toll was removed from 1 July 1994,[3]
After an appraisal carried out in 2016, restoration work aimed in particular at a better waterproofing of the concrete has been carried out since 2017.[4]
Technical characteristics
The technical characteristics of the Noirmoutier bridge are as follows:
- Total length: 583 m (1,913 ft)
- Main central span: 88 m (289 ft)
- Deck width: 13.50 m (44.3 ft)
- Height under main apron: 24 m (79 ft)
- Mainland access viaduct: 4 continuous spans with a span of 55 m (180 ft)
- Main viaduct: 3 continuous spans 55–88–55 m (180–289–180 ft)
- Access viaduct on the island side: 3 continuous spans with a span of 55 m (180 ft).[5]
The deck is made up of two box girders assembled in prestressed concrete 3.80 m (12.5 ft) wide with 1.32 m (4 ft 4 in) cantilevers. These two prefabricated caissons are connected by a slab poured in place 0.80 m (2 ft 7 in) wide.
The piles are largely based in the ground, to rest on solid ground. The foundations are approximately double the visible height of the piers. These are hollow, except those of the central bay, in anticipation of collisions with possible boats. [6]
The construction was carried out by assembling the segments using a launching gantry making it possible to pose the corbelling symmetrically on each side of the supports. The 258 prefabricated segments unit weight is approximately 50 tonnes.
The manufacture of the piers used 4,000 m3 (140,000 cu ft) of concrete, 13,500 m2 (145,000 sq ft) of formwork and 250 tonnes of high-grade steel. The deck required 4,500 m3 (160,000 cu ft) of concrete, 160 tonnes of reinforced concrete steel and 180 tonnes of steel cables for the prestressing.[6]
References
- Gourin, Didier (3 July 2021). "Entre le continent et l'île vendéenne. Depuis cinquante ans, Noirmoutier fait le pont" [Between the mainland and the Vendée island. For fifty years, Noirmoutier has bridged the gap]. Ouest-France (in French). Retrieved 3 July 2021.
- Boutin, Émile (1986). Pays de Retz, Noirmoutier, île d'Yeu. ISBN 2-7048-0485-0.
{{cite book}}:|work=ignored (help). - de La Casinière, Nicolas (8 June 1996). "Le péage "écologique" de Noirmoutier a bon dos. Argent et sélection motivent largement le projet d'"éco-taxe"" [Noirmoutier's “ecological” toll has its back. Money and selection largely motivate the "eco-tax" project]. Libération (in French). Retrieved 3 March 2021.
- Dupré, David (29 March 2019). "Noirmoutier. À 50 ans, le pont se refait une beauté" [Noirmoutier. At 50, the bridge is getting a makeover]. Ouest-France (in French). Retrieved 2 July 2021.
- "Pont de Noirmoutier-en-l'Île]". Structurae.
- Martin, Henri (1971). Noirmoutier presqu'île? Étude historique [Noirmoutier peninsula? Historical study] (in French). Fontenay. OCLC 70361257.
External links
- Video: Dusatoir, Patrick. Planète TP : Pont de Noirmoutier (in French).
