ROCKMAT Logo

ROCKMAT is an innovative concept for offshore wind turbine foundations, adapted to uneven seabed.

Its simplicity opens way for site preparation, installation and decommissioning cost reductions :

No site preparation
No costly lifting barge crane with relevant meteorological restrictions
Means of marine operation limited to tug boats
Reversible water ballasting

ROCKMAT was conceived by French engineering companies for the offshore industry :

CETEAL, structural engineering company for the offshore wind turbines industry
CATHIE ASSOCIATES, Offshore geoscience and geotechnical engineering office
DV OFFSHORE, marine operations engineering office

The ROCKMAT concept patent is registered and the cluster is able to lead feasibility and detailed engineering

ROCKMAT
62, avenue Larroumès
94240 L'Haÿ les Roses
FRANCE

Tel : 33 (0)1 47 40 31 61
Fax : 33 (0)1 46 65 81 30

The technological concept

A prefabricated and self-floating offshore foundation
Installation by monitored ballasting
Settlement by concrete injection in a flexible modular form
A 30-hour installation with light marine operation :
- 1 100-t bollard pull tug boat
- 3 10-t bollard pull tug boats
- 1 barge supplying concrete mixing unit and compressor
Regular construction technology, construction material and instrumentation

Competitive benefits

Intrinsic simplicity
Construction, installation and decommissioning costs
The foundation erection can be performed by local industry facilities

Applications

Wind turbine, substation, oil & gas platform, current and tide turbine
Steel jacket or gravity base structures
Rocky soil with or without a light sediment layer
Uneven seabed with a 1-m tolerance
No intrinsic limitation against water depth, with regards to traditional foundations

The partners

Structural engineering

CETEAL is a non-affiliated engineering office based in France, for the design and analyses of offshore wind turbines foundation structures. Twenty years of experience in the offshore industry, and more than 3,400 onshore wind turbine foundations designed in 10 years.

www.ceteal.eu

Geotechnical analyses

Cathie Associates is a consulting and engineering office, specialized in offshore geoscience and geotechnics. With an original activity for the Oil & Gas industry, Cathie Associates also accounts for a wide experience in the offshore wind turbines industry, notably in Germany and in the United Kingdom.

www.cathie-associates.com

Marine operations

DVO is an engineering consultancy contractor providing design and project support services to oil companies and operators in the oil and gas industry. DV Offshore's expertise includes floating systems, terminals, mooring systems, subsea production, pipelines & risers, allowing us to provide technical and operational support to operators and oil companies in the Oil and Gas and Offshore Logistics industries worldwide.

www.dvo.fr

Business Development

Business Crescendo is a strategy and business development consulting firm that supports high technology companies in the starting up of new activities in France, and in their international growth.