Construction of concrete floating docks for the French Navy
The project consists in designing, building and maintaining two 160m-long floating docks for the new multi-mission frigates of the French Navy (FREMM).
The Charier consortium was awarded the project based on a very innovative design that focused on finding optimal functionality for vessel refuelling operations.
The structure consists of a reinforced concrete floating dock with a double deck:
the first deck houses all the dry and wet service networks, while the totally unobstructed second deck provides access to vehicles and transhipment of suppliers.
Floating dock dimensions:
Pier head dimensions
Floating dock approach ramp
Reinforcement of the quay by ground anchors 30 lm each
Dredging the sinking basin for docking
Project
- Client: Service d'Infrastructure de la Défense de Brest (Brest Defence Infrastructure Department)
- Prime Contractor: Artelia
- Duration of works: 20 months per major civil engineering structure
- Amount: €26,000,000 excluding tax
Distinctive features and constraints
- Design of the 1st structure in-house
- Towing and transporting 10,000 tons per structure
- Double deck bridge incorporating all fluids
- Integrating sediment into the pier head ballast
- Grading and removing pyrotechnic machinery
The Charier consortium was awarded the project based on a very innovative design that focused on finding optimal functionality for vessel refuelling operations.
The structure consists of a reinforced concrete floating dock with a double deck:
the first deck houses all the dry and wet service networks, while the totally unobstructed second deck provides access to vehicles and transhipment of suppliers.
Our project also included
- Dredging, pyrotechnic clean-up and recovery of dredged sediment in situ
- The reinforcement of the quay and installation of an approach ramp
Main quantities
Construction of the drydock, installed by flotation and towing, mooring to quay and pier head.Floating dock dimensions:
- 160 m long
- 17 m wide
- 8 m high
- 3,250 m3 of reinforced concrete
- Construction of the drydock pier head, installed by flotation and towing, mooring to quay and mooring pier head.
Pier head dimensions
- 14 m in diameter
- 21 m high
- 530 m3 of reinforced concrete
Floating dock approach ramp
- 35 m long
- 5 m wide
- 100 tons of steel
Reinforcement of the quay by ground anchors 30 lm each
Dredging the sinking basin for docking
- 6,500 m3 of sediment dredged
- Grade and remove pyrotechnic elements
- Treat sediments using hydro-cycloning and adding hydraulic binder
- Containment and recovery of polluted sediments in pier head ballast material
