Articles & Case Studies


Posted: Tuesday 1st September 2015

Polypipe, the UK’s leading manufacturer of sustainable drainage and water management products, has completed works on a complex drainage solution on the Glasgow and South Western rail line in Scotland.

After experiencing localised slipping of the cutting bank due to a combination of saturated ground and a blockage of the field drainage system, main contractor Amey was tasked with designing a new network of crest drainage at the Drumshinnoch Cutting near Thornhill.

In order to maintain the stability of the cutting and supporting soil, Amey designed a new network of crest drainage, down slope herringbone drainage and catchpits – based on Network Rail standard model clauses and standard detail drawings.

Polypipe was tasked with supplying an appropriate drainage solution for the site, for which half perforated Ridgidrain land drainage structural wall pipework, perforated land drain and prefabricated catch pits, manufactured off site at Polypipe’s manufacturing facility, were specified.

Ridgidrain is manufactured from high strength HDPE using a structured wall design to produce a robust but flexible pipe. It has a low friction inner wall and, due to the reduced number of joints, a significantly reduced risk of leakage. Its excellent chemical and abrasion resistance ensures that Ridgidrain is widely specified in land drainage applications.

The lighter weight nature of Ridgidrain made it especially well suited to the Drumshinnoch Cutting project, thanks to its comparatively easier transport, handling and installation capabilities in a rural environment.

Polypipe’s 900mm catchpits used on the projects were manufactured off-site at Polypipe’s facility. Designed to separate silt and other particles, catchpits help to improve the quality of water before it is reintroduced into the environment. Polypipe worked closely with Amey in order to fabricate a system that took into account water flow rates and ground conditions specific to the site.

Russell Belleguelle, Polypipe’s Project Manager, said: “Having gone through an extensive and robust procedure with Network Rail to gain PADS approval for our products we are delighted to see their use in a diverse range of rail applications. While alternative systems were considered, the benefits of specifying and installing a lightweight Polypropylene ring seal pipework system and catch pit chambers proved to be the material of choice for the Drumshinnoch project”.

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August 2021

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