Rockbags

Rock bags were developed and first used in 1987 to protect the foundations of the great bridge at Akashi.
For more than 25 years, they have been widely used in civil engineering for rivers and port works primarily in Japan with over 700,000 Rockbags deployed.

This proven system is now available in UK.

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Making Rockbags

A Filter Unit Rockbag is produced by placing an empty Unit into a production frame and filling it with natural stone or quarried rock. The Rockbag net is then drawn together at the top and the 6 hanging ropes are bound onto the single hanging ring according to the manufacturer’s instructions.

The production frame is lifted away and the Rockbag is now ready to be transported and deployed.

Features of Rockbags

  • Fast Installation
  • Single point lifting system
  • Significantly reduces vessel time
  • No seabed preparation required
  • Develops marine life
  • Environmentally friendly
  • Accumulates sediments
  • Flexible & durable
  • Rapid preparation
  • Lifetime minimum 50 yrs in saline water
  • Lifetime minimum 30 yrs against UV rays

Rockbags are used for

Kyowa Filter Units, known in the UK as Rockbags, are used to protect riverbanks, coastal areas, bridges and monopiles from scour damage. Designed for use in marine environments, they are constructed of synthetic mesh and filled with aggregate stone.

They are typically deployed at offshore wind and oil and gas developments for subsea assets protection, while also providing erosion protection for river embankments, bridges and foreshores in the marine civil engineering sector.

Where are they used

  • Bridge piles
  • Riverbanks
  • Subsea cables
  • Pipelines
  • Harbour and sea defences
  • Temporary roads and dykes
  • Coastal areas and shorelines
  • Offshore oil, gas and wind installations

How do they look over time? (RIVER BANK AND SHORELINE)