precision hydrodemolition on marine structureRGL has substantial experience of working on a wide range of structures in marine and freshwater environments. Over the years we have worked on jetties, piers, quays, bridges, tidal defences, concrete caissons and underwater gas/oil pipelines for power generation companies, harbour authorities and petroleum companies.

Repairing, maintaining or decommissioning concrete or steel structures in a marine environment often poses technical challenges requiring bespoke solutions which RGL strives on developing.

High pressure water jetting in marine environments can be hazardous which has led RGL to develop solutions that reduce reliance on divers and where machine operators can operate jetting equipment a safe distance away from the water jets.

A further benefit of using hydrodemolition is that it uses drinking water as the blast medium which can be returned to the marine environment with no negative environmental impact.

Concrete hydrodemolition

We use ultrahigh pressure water to remove “spalled” concrete quickly and effectively providing  an excellent surface for new concrete to adhere to. This method is used to repair the effects of corrosion to concrete reinforcement and tidal/marine degradation of concrete structures.

Removing the concrete weights holding pipes to the sea bed so that pipes can be inspected and repaired as required. RGL is also able to cut out sections of this type of pipe using specialist abrasive jet cold cutting equipment.

Abrasive water jet cutting

The RGL underwater pile technology cuts piles from inside outwards which avoids the need for costly and potentially hazardous underwater excavations around the circumference of the pile. This innovative technology provides an economic and safe alternative to diver-operated processes whilst minimising environmental harm.

There are few dimensional standards to the piles RLG have decommissioned of previous years and we often have to manufacture bespoke rigs for specific diameters and situations. To date, RGL have successfully cut piles under water up to 4.2 meters in diameter with wall thickness of 60+mm in depths of up to 50 meters.

Coatings removal/surface preparation

  • Scabbling concrete efficiently and economically without causing vibration or dust.
  • Removing coatings and waterproofing.
  • Providing a “key” to smooth surfaces to facilitate re-coating or layering with new concrete.

Underwater pipeline maintenance

For oil, gas, sewage, wastewater outfalls or cooling water intakes RGL have used Ultra High pressure water to:

  • Remove failed protective coatings.
  • Cleaning the internal bore of marine pipework by removing marine encrustations, corrosion and/ or sediment build up.