Triwind

“TRIWIND” is a project focused on the development of a floating concrete platform for the installation of offshore wind turbines.

Floating offshore wind has become the latest major evolution in the renewable energy sector. As a result, floating offshore wind infrastructure represents the future of energy generation. These floating platforms are required when water depths exceed 50 meters.

Steel offshore platforms are typically designed for a service life of 20 to 30 years, due to corrosion and fatigue effects in the marine environment. The construction of a steel platform for a 5 MW offshore wind turbine requires at least 1,000 tonnes of steel, and can even reach double that amount, in addition to requiring regular inspections and maintenance. These drawbacks can be overcome by using concrete floating platforms, which can achieve a service life of up to 100 years.

Partners:

The project involves BERENGUER INGENIEROS and the Polytechnic University of Madrid.

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Design and Construction Advantages of the Triwind Float Platform

Triwind Float is a floating platform featuring an innovative and efficient assembly and commissioning system, resulting in significant cost savings, a much shorter execution time compared to existing steel platforms, and enhanced safety.

The Triwind platform weighs approximately 28.5 tonnes and requires a total concrete volume of 11,400 m³. Its construction is based on port caisson technology, commonly used in the execution of breakwaters and quay walls. It consists of a prismatic base, external vertical walls, and an internal grid of cells that are closed at both the bottom and top.

 

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Structural and Hydrodynamic Behavior of Triwind Float

Despite the significant loads acting on the structure and the large moments transmitted by the wind turbine, the concrete structure experiences minimal bending. The primary stress acting on the structure is compression, achieved through its geometry and configuration.

The proposed platform, including the superstructure it supports (wind turbine), has an initial draft of around 10 meters. This allows for full onshore assembly and subsequent towing to its final location in a vertical position, providing high naval stability, a long natural period of oscillation, and low resistance to movement.

The platform exhibits optimal hydrodynamic performance, preventing and minimizing potential resonance effects between waves, wind, the structure itself, the mooring system, and the wind turbine.

 

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