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Skanska in the UK

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Design, construct, install

A high-value solution

Skanska and Boskalis Offshore, both global players, provide the competence, expertise and financial strength required to successfully perform the complete EPCI package for concrete gravity substructures.

Collaboration is key to our approach. Alongside our design partner Grontmij we are one team who will work closely with all stakeholders to deliver bespoke solutions.

Through our specialist skill set we can manage and mitigate design, construction and offshore construction risks.

We put into practice standard, proven lean techniques to deliver a mass production solution and employ standard installation vessels from our in-house fleet to provide economic efficiencies.

Developed and built in the UK, it will bring direct employment and, through the strength of our supply chain partnerships, the creation of jobs in local communities.  

We will create life-changing career opportunities through apprenticeships and the associations we build with local enterprises – delivering on our commitment as Gold standard Investors in People.

Design

Ours is a hybrid substructure, which maximises the benefits of steel and concrete for efficient design. 

It’s adaptable and scalable and can be deployed in the most complex of environments, in water depths up to 60 metres and with different turbine sizes.

Working together, Grontmij and Boskalis Offshore will calculate the optimum substructure design for each specific location, taking into account all relevant factors including meteocean data, soil conditions, turbine loads and transport and installation requirements.

From the outset we took an holistic approach, considering  all aspects of the total process.

The result is a future-proofed and robust solution, with the design delivering a number of tangible benefits:

  • Durable, long lifespan with low maintenance requirements
  • Self-buoyant structure eliminates need for specialist vessels
  • No access required onto the foundation during the tow or water ballasting operations
  • Ability to be future-proofed for re-powering at a later date
  • Turbine loads carried by the central shaft, providing flexibility

Construction

We have carried out the detailed planning of a mass production facility for the construction of the substructures and have identified a number of port locations that are suitable for our needs.

All aspects of the construction process are based in the UK, where we have developed strong local supply chain partnerships and will use readily available and locally sourced materials and labour.

A large multi-discipline workforce is required to construct the number of substructures needed to satisfy developer programmes. We have a motivated team who will drive performance and efficiency through proven, standardised, repetitive, lean techniques.

Our mass production planning benefits from prefabrication on a significant scale, which will drive cost benefits and programme certainty.

Through our work safely or not at all approach, we will continue to promote and develop our Injury-Free Environment culture, where the safety, health and well-being of all employees is paramount.

Installation

We have the in-house capability for all offshore construction activities.

With access to an in-house fleet of over 1,000 vessels we can ensure the right vessels are available to meet programme requirements.

In parallel with the substructure construction, our offshore marine teams will prepare the seabed in preparation for the installation process. Through this parallel construction method we can take key elements off the critical path, providing greater programme efficiency and security.

During the transportation and installation we have developed a work method and bespoke equipment that removes the need for any personnel to access the structure before it is safely positioned on the seabed.

Installation strategies have been tried and tested extensively on similar offshore projects and have involved certifying bodies to verify novel approaches within the methodology from concept through to execution. All installation processes have been developed to a level of detail which makes them suitable for a very short project preparation time-frame.

The decommissioning process is as straightforward as our installation. The substructure is designed to be fully recovered at the end of its life and recycled.