Offshores structures such as oil and gas platforms, marine and harbour facilities, and offshore wind turbines, are critical infrastructure at risk from extreme loading and events. As such, the design, construction and maintenance of these structures require the expertise of a specialist like VSL, who offers a diverse range of durable and cost-effective solutions that can be combined to create bespoke packages or applied as standalone services.

Ground improvement

The improvement of ground properties guarantees solid foundations and therefore, improved stability, durability, and increased success of construction works. Ground improvement also reduces the cost of foundation works.

Ground improvement methods include:

• Soil consolidation techniques such as grouting, jet grouting, vibro-compaction, stone columns, soil mixing
• Environmental protection such as slurry walls and curtain grout
• Temporary consolidation such as curtain wall by ground freezing
• Dewatering
Drainage and preloading to consolidate compressive soils

Quay walls

These retaining structures combine diaphragm walls with ground anchors to allow the construction of watertight sea walls. This combination of methods offers an efficient and economical solution for the construction of offshore structures.

Post tensioning

VSL Technologies

The use of post-tensioned concrete for large marine structures is recognised as a proven solution that protects the steel reinforcement against corrosion, thus eliminating cracking, and enhances water and air tightness of the structures, allowing them to withstand heavy wave and ice loading. Compared to steel solutions, prestressed concrete offers distinct advantages in terms of durability, low maintenance requirements, fatigue resistance, stability and economical aspects.

Heavy lifting

A range of techniques to handle heavy loads, including lifting, lowering, tilting and sliding, that allow for alternative construction methods compared with standard in-situ or crane. These bespoke techniques are designed to meet each project’s requirements and offer an increased opportunity for creativity, scale and speed of construction.


A monitoring scheme, including the integration of permanent or quasi-permanent sensor systems, which allows the collection and analysis of data to control and anticipate the structural behaviour and stability of an offshore structure, and optimise maintenance and repair interventions.

As soon as your offshore structure is built, it is entering a long-term life cycle with evolving needs and continuous preservation, repairs and upgrading obligations.

Discover how to preserve your asset