Marine Structures

precision hydrodemolition on marine structureRGL has substantial experience of working on a wide range of marine and freshwater structures. These structures are commonly made of concrete and/or steel, and require hydrodemolition, surface preparation or abrasive water jet cutting.

Jetties, piers, quays, bridges, tidal defences, concrete caissons and underwater gas/oil pipelines– you name it, we understand the typical challenges faced on each type of project. The Thames barrier, Hunterston and Heysham nuclear power stations, Southampton and Swansea docks, Brighton Marina and Canary Wharf are just some of the projects we have worked on for power generation companies, harbour authorities, petroleum companies and highway authorities.

Repairing, maintaining or decommissioning concrete or steel structures in a marine environment poses some difficult technical challenges. To add to the pressure, many of these structures often have a high level of strategic importance.

Whatever the challenge is, we have the people, plant and expertise to provide solutions that are effective and safe, irrespective of size, complexity or whether it involves above water, underwater, or sub-seabed operations. Most of our solutions are fully automated so you can be confident that our methodology, work sequence and productivity levels will meet your requirements.

High pressure water jetting in marine environments can be hazardous, and for this reason we have invested heavily in developing automated solutions to reduce the requirement for divers or operators in close proximity to the water jets.

RGL offers four key services for marine structures:

Concrete hydrodemolition

This is used primarily for preventative maintenance and repairing the effects of tidal/marine degradation and corrosion to the fabric of the structure.

RGL is one of the few service companies that undertakes hydrodemolition with ultra high pressure water. This provides clients with precision cutting to any depth within very tight tolerances – and reinforcing steel can be either left undamaged or cut/removed if required. The remaining concrete steel structure retains its original integrity without suffering any damage or cracking and provides the required substrate ready for subsequent repair works.

Abrasive water jet cutting

Many marine structures, such as jetties and bridges, sit on concrete and tubular steel piles. RGL is one of the companies in the UK to have developed a unique automated method for the internal cutting of steel piles and a highly effective method of cutting concrete piles underwater or below seabed level. The process uses ultra high pressure water jets, combined with a fine abrasive which can cut any material above or below water – a technique that significantly reduces hazards posed to operators and offers substantial cost savings over alternative methods.

Coatings removal/surface preparation

Whether there are damaged or degraded concrete slabs, piles or beams, or corroded steel surfaces that need to be re-treated, RGL can offer hydrodemolition techniques or our automated Limpet crawler system to provide ideal substrates for new coatings or concrete repair mortars.

Underwater pipeline maintenance

For oil, gas, sewage, wastewater outfalls or cooling water intakes we have used hydrodemolition techniques to: remove concrete weight and coat failed protective coatings. We have used abrasive water jet cutting for disinvestment and UHP water jets for cleaning the internal bore from marine encrustations, corrosion or sediment build up.