Port of Brest enclosure breakwater

Vue aérienne d'un projet de construction de pont avec une longue estacade temporaire incurvée et des grues jaunes sur des coffrages circulaires s'avançant dans une étendue d'eau bleu-vert. Un pont suspendu lointain et une côte boisée parsemée de maisons sont visibles sous un ciel partiellement nuageux.

Sea Extension

Location
France, Brest
Delivery
November 2019
Client
Région Bretagne
Contractor
Bouygues Travaux Publics Régions France

Construction of a sea wall

To support the development of marine renewable energies, the Port of Brest has undertaken the construction of a new terminal dedicated to the handling of goods related to their operation.

Several worksites have been launched, including that of the enclosing dyke, the first stage in the creation of a new 14-hectare polder that will house part of the facilities.

Vue aérienne d'un chantier de construction maritime avec une longue structure courbe en cours de réalisation dans des eaux turquoise, flanquée de grues jaunes et de barges, avec un pont au loin.

14
ha of additional area
26
circular cofferdams
800,000 t
riprap

Engineering at the service of the Breton coastline

This contract, awarded to Bouygues Travaux Publics Régions France, involves the construction of an 890-metre-long arched dyke to close off an “enclosure” where the marine sediments dredged from the port will be stored, in other words 1.25 million m³ of sediment.

The breakwater consists of 26 circular cofferdams and 25 festoons made of flat sheet piles 21 to 33 metres long. This solution was preferred to a sloped breakwater because it allows for greater sediment storage. The breakwater also incorporates eco-reefs that retain water at low tide to preserve ecosystems.