Articles & Case Studies

UV drain relining ideal where access is difficult

Posted: Tuesday 18th November 2014

Lanes engineers have used no dig ultraviolet lining technology to rehabilitate a highways drain along a rural road that had repeatedly flooded, causing major problems for road-users getting to and from nearby housing estates.

The project demonstrated the benefits of the ultraviolet (UV) relining technique, which can be more easily deployed in areas where access is difficult and where there is tree cover.

Lancashire Council commissioned Lanes Group to reline the surface water drain along the tree-lined road in Clayton-le-Woods, south of Preston, which is a busy route linking local communities and for parents dropping off children at a school.

The clay pipe, 220m long and 225mm in diameter, had been penetrated in many places by tree roots, trapping silt and debris, resulting in serious localised flooding during and after periods of heavy rain.

Derek Campbell, Lancashire and Cumbria Area Development Manager for Lanes, the UK's largest independent utilities, drainage and underground pipe repair specialist, said UV relining was clearly the best option.

He added: "There are trees along the run of the pipe. So it wasn't possible to use the standards trenchless cure in place pipeline (CIPP) technique, which requires a scaffold tower and a crane to invert the liner into the pipe.

"With UV relining, the tower and the crane is not needed, because the liner is pulled through the pipe and then inflated with compressed air. An array of UV lights is then used to cure, or harden, the resin in the liner.

"If UV relining wasn't available, the only option would be to excavate the pipe, which would have caused serious road disruption for several weeks, and would have cost vastly more than this trenchless reline solution did."

UV relining requires fewer support vehicles and less machinery, which also makes it better suited to being deployed along smaller rural roads, where access may be difficult and off-road space limited.

The UV curing process also takes much less time than hot CIPP, so is well-suited to highway projects where road closures and traffic management systems must be in place for as short a time as possible to minimise disruption.

Lanes' Reline Division, based in Manchester, worked with drainage engineers based in Preston on the project.

A jet vac tanker combined with a special flail jet head was used to cut through most of the roots with high pressure water. Larger roots were removed with a robotic KA-TE cutter. It has a grinding head that can slice through steel and concrete, as well as wood.

Derek Campbell said: "Once the roots and silt were removed, the pipe was ready to be relined. The operation took just one day. It demonstrates the speed with which we can reline a highway drain, solve a persistent flooding problem, and get the road open and operating normally again."

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