Studied Solutions For The Crossing of The Seine
Several types of structure are possible to cross the Seine while retaining the possibility for larger boats to access the port of Rouen.
- Fixed bridge gauge sea: it is necessary for this type of structure to provide a template of 55 metres in height above the highest navigable water (PHEN). Its urban integration becomes difficult, especially if one wants to limit the slopes of the viaducts, it is not possible to provide interchanges with ways on bank near the bridge. This solution was used to cross the Loire to Nantes for Cheviré bridge.
- River tunnel: this solution is expensive - for its construction and operation - and poses security problems for the passage of hazardous materials. Moreover, it is difficult to predict exchangers near the banks. This solution was made for the tunnel in the Old Port of Marseille.
- fixed bridge river gauge: this solution limits the size to 7 metres high. But it no longer allows access to cruise ships in the heart of the city and organise sailing events of the type Armada.
These various solutions have led the client to study a book mobile for the passage of large boats only need 20 to 30 times a year. This type of structure is required to meet the template river throughout the year and the template for the few maritime passages of large boats.
Several solutions drawbridge can be selected:
- a bascule bridge: but this is a problem of implementation support in the Seine to avoid having too large spans. This solution was chosen for the lift bridge Seyne-sur-Mer or Tower Bridge.
- a swing bridge, which has the disadvantage of a linear neutralising important platforms and requires their reinforcements. This is a solution that was taken to the bridge Caronte.
- a lift bridge. This solution requires the realisation of high-rise towers on both sides to release the template sea. This solution reveals the different constraints on the closer. The lifting of the centre span needs to cut traffic. This is the type of structure implemented in Brest for the Pont de Recouvrance. This is the solution finally chosen.
Read more about this topic: Pont Gustave-Flaubert
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