Pont de Lézardrieux
Coordinates: 48 ° 46 ′ 50 " N , 3 ° 6 ′ 23" W.
| Pont de Lézardrieux | ||
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| use | Road bridge | |
| Crossing of | Trieux | |
| place | Lézardrieux , Brittany | |
| construction | Cable-stayed bridge | |
| Longest span | 150 m / 112 m | |
| Clear height | 18 m - 30 m | |
| completion | 1840/1889/1925 | |
| planner | Marc Seguin / Ferdinand Arnodin / Gaston Leinekugel Le Cocq | |
| location | ||
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The Pont de Lézardrieux is a road bridge over the Trieux in Lézardrieux in the Côtes-d'Armor department in Brittany .
location
The bridge, which has been rebuilt several times over the years, now leads the departmental road D 786 over the Trieux, which is deeply cut by a strong tidal current, and thus connects Paimpol further east via Lézardrieux and Tréguier with Lannion , the nearest larger town. Before the construction of the Pont de Lézardrieux, the only bridge over the Trieux between Guingamp and the sea stood in Pontrieux, about 10 km further south .
history
Suspension bridge from 1840
After years of debate and fierce opposition from the ferrymen and the town of Pontrieux, Marc Seguin was awarded a concession in 1836 to build and operate a suspension bridge for 26 years. It was not allowed to hinder shipping and therefore had to have a clearance height of 30 m above low tide and 18 m above mean spring high tide . The 4.20 m wide bridge had high, brick pylons with attached masonry arches for the connecting ramps to the high banks and a 150 m long girder. It was opened in 1840.
Suspension bridge from 1889
After the bridge was no longer able to cope with the increased traffic loads and signs of fatigue appeared, its superstructure was renewed in the years 1882 to 1889 by Ferdinand Arnodin according to his system with four stay cables anchored at the pylon tips and subsequent suspension with vertical cables on the suspension cables. The roadway girder was widened to two lanes.
The bridge renewed by Arnodin
dito
The bridge rebuilt by Leinekugel Le Cocq
Cable-stayed bridge from 1925
In the course of the expansion of the railway network with meter-gauge lines , the bridge was completely rebuilt from 1922 to 1925 by Gaston Leinekugel Le Cocq according to the system introduced by Albert Gisclard and further developed by him, so that it could accommodate one track and two lanes next to it. For this purpose, new pylons with a reinforced concrete substructure and steel pendulum supports were built a little closer to the navigation channel, so that the span was reduced to 112 m. While traffic was running, the new bridge deck was suspended in sections under the old girder on a Gisclard type stay cable, in which the cables extend into the opposite half of the bridge and form a characteristic knot in the middle just above the carriageway . After the completion of the new superstructure, the old one including the brick pylon tops was removed. From the old bridge, only the massive substructures of the pylons and the two masonry arches for the access ramps remained, which were replaced by steel girders during a later renovation.
When the Chemins de fer des Côtes-du-Nord line was finally closed in 1950, the track on the bridge was removed and two paved lanes and a narrow walkway were installed. In this condition - after general renovation work in the years 1988 to 1993 - it is still in use.
