Polypipe’s proven Permavoid geocellular sub-base replacement system has been installed at the recently opened Winnersh Triangle Park & Ride.
Polypipe provided the ideal stormwater attenuation solution for the new park and ride car parking facility, completed in partnership between Reading Borough Council and Wokingham Borough Council to create a sustainable mode of transport for commuters.
Polypipe worked with the project’s consultant engineer from the early design stage to assist with the initial solution for the new 390 space car park. The scheme incorporated 29 shallow Permavoid attenuation tanks with the capacity to store up to 590m³ of stormwater runoff from the car park.
The site’s geology consists of a high water table to cover level, which meant that an attenuation solution needed to be carefully considered. Due to its shallow installation, Permavoid proved to be the ideal solution as it could be installed above the water table. Working with the design team the tanks were strategically positioned to eliminate the need for the installation team, Keytec Environmental Ltd, to be working within the ground water zone.
The Permavoid high strength geocellular solution, incorporates a unique jointing mechanism that forms an interlocking ‘raft’ with exceptional strength that will support structural loads across the most heavily trafficked areas on the site. The surface finish consisted of both gravel and asphalt and Polypipe assisted the design team with structural and flotation calculations to ensure the minimum depth of sub-surface could be achieved while preventing the geocellular tanks from floating.
In addition, Polypipe worked with main contractor Dawnus to ensure that further structural loading calculations were carried out to define the on-site travel routes for the different surface laying machinery to allow surface works to be carried out without any detrimental effect to the Permavoid tank installations.