The offshore wind turbine plant
The Joannes Couvert quay project in the Port of Le Havre involves the construction of an offshore wind turbine manufacturing plant for Siemens Gamesa Renewable Energies (SGRE). It is the largest manufacturing project in the history of the French renewable energy industry. The 36-hectare site will produce turbine blades, as well as assembling and repairing turbine nacelles. It will play a leading role in the development of new wind farms offshore Normandy and Brittany.
Worksite operations include the construction of two production buildings with office spaces, and storage/transport areas for wind turbine components. A new WWTP (wastewater treatment plant) will also be built as part of the project.
The choice of foundations
Because of the thick layers of silt beneath the heavy operating loads imposed by the new production plant, the initial foundation solution was to implement piles the entire structural footprint to reduce settlement.
As a specialist in soil improvement technologies, Menard France was able to propose an alternative solution to reduce settlement : Controlled Modulus Column (CMC) rigid inclusions beneath the paved surfaces of several production areas, beneath the foundations and paved surfaces of peripheral buildings, and beneath the WWTP.
This shallow foundation solution implemented in close cooperation with the deep foundation contractors (Soletanche Bachy Fondations Spéciales & Botte fondations) successfully met the technical and economic challenges of the client. Menard France is working on a co-contractor basis with VINCI and Equans companies.