FR | Normandy bridge | Le Havre
Spanning the Seine Estuary, the Normandy Bridge links the two cities of Le Havre and Honfleur since 1993. With a distance between pylons of 856 m, this structure held the world record for a suspended bridge span.
The northern pier is situated in the estuary, close to the navigation channel. Thus, the designers had to ensure that it is protected against any accidental impact from vessels sailing up the Seine towards Rouen, vessels that can measure up to 100 000 tonnes. After studying various protection systems the engineers found an ingenious system based on straight web sheet piles.
The method to protect the pier involved surrounding the base of the pylon, which is the shape of an inverted Y, with a dyke-type structure consisting of 13 sheet pile cells. The circular cells have a diameter of 9 m and are 16 m high. They are connected by junction piles. The cells are made more rigid by being filled with "colcrete" type concrete, comprising gravel injected with cement grouting. The dyke is reinforced on the water side by a rip-rap.
The artificial island thus formed acts like a huge bumper. The structure used over 1 000 tonnes of straight web sheet piling.
The northern pier is situated in the estuary, close to the navigation channel. Thus, the designers had to ensure that it is protected against any accidental impact from vessels sailing up the Seine towards Rouen, vessels that can measure up to 100 000 tonnes. After studying various protection systems the engineers found an ingenious system based on straight web sheet piles.
The method to protect the pier involved surrounding the base of the pylon, which is the shape of an inverted Y, with a dyke-type structure consisting of 13 sheet pile cells. The circular cells have a diameter of 9 m and are 16 m high. They are connected by junction piles. The cells are made more rigid by being filled with "colcrete" type concrete, comprising gravel injected with cement grouting. The dyke is reinforced on the water side by a rip-rap.
The artificial island thus formed acts like a huge bumper. The structure used over 1 000 tonnes of straight web sheet piling.
|
Project owner |
Le Havre - Chamber of Commerce and Industry | FR |
|
Consulting engineer |
Direction Départementale de l'Equipement de Seine-Maritime, SETRA, assisted by SOGREAH | FR |
|
Main contractor |
Quillery | FR |
|
Steel sheet piles |
R 500 J 9.5 | E 270 SP | Interlock strength of 300 t/m PU 25 | E 270 SP | 67 t PU 6 & PU 8 | E 270 SP | 12 t |
|
Quantity |
1 000 t |
First published:
Latest revision: 02/2019
Last modified: February 19, 2019
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