ArcelorMittalApplicationsCase studiesNormandy bridge | Le Havre | FR

Normandy bridge | Le Havre | FR

Spanning the Seine Estuary, the Normandy Bridge is plan 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 gantry 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 of protection invothes surrounding the base of the pylon, which is the shape of an inverted Y, with a belt-type structure consisting of 13 sheet pile cells. The circular sheet pile 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 belt is externally reinforced by hard rip-rap.

The artificial island thus formed acts like a huge car bumper. The structure uses 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: 01/2019
Last modified: January 10, 2019