Polypipe CGU worked closely with the project’s contractor and consultant engineer to deliver an intelligently engineered solution using its Ridgistorm-XL large diameter plastic pipe system, prefabricated C sections, and twin leg runs.
The first attenuation system holds a stormwater volume of 159m³, while 14 6m and two 3m lengths of 1,500mm diameter Ridgistorm-XL, with a SN2 stiffness class, were positioned at a depth of 1.5 metres with a twin pipe run of 42.5 metres in length. The second larger system included 19 6m lengths and two 3m lengths of the 1,800mm diameter Ridgistorm-XL, with a SN2.8 stiffness class, providing a 320m³ capacity.
With Polypipe CGU’s technical support and flexibility, the contractor was able to achieve an exceptionally quick turnaround.
This system was installed with a longer twin pipe run of 60.5m. Both systems had spigot socket push-fit joints and sealing rings for speed of installation on-site and were installed beneath a public open space.
Ridgistorm-XL is designed as a flexible structure to minimise the effects of ground movement, differential settlement and deformation and the pipes were manufactured to meet specific stiffness classes between SN1 and SN8, which was determined following detailed analysis of the site conditions. This flexibility at the manufacturing stage ensured that the delivered pipes would stand the test of time once in position. As the client required an exceptionally quick turnaround for the manufacturing and delivery of the solution for the Wynyard Park site, Polypipe CGU was able to meet this challenge by providing the contractor with high levels of technical and pricing support, working together to ensure that the solution was delivered on time and within budget.
Rosie Cheetham, Marketing Manager at Polypipe CGU said: “Polypipe offers UK housebuilders the most comprehensive range of thermoplastic drainage and water management systems. Using the expertise of our team and the capabilities of our Ridgistorm-XL system, we were able to provide the Wynyard Park site with a solution that was more cost-effective, quicker to install, and created less waste than the original Box Culvert system specified.”