Interflow recently completed a sewer renewal project for Coliban Water, located along View Street in Bendigo’s CBD which is subject to high volumes of pedestrian traffic.
On initial inspection, the extent of the existing damage meant that a large section of the sewer required replacing via open trenching prior to relining.
Any excavation to the site would undermine the integrity of the support columns of a nearby heritage listed balcony structure, meaning significant structural support was required at considerable cost.
To remain economical, a temporary propping system was designed to ensure there was no risk of foundation movement or settlement of the site during and after works.
As an overall solution, the damaged section of the pipe was repaired and the sewer relining was completed by using SPR™ EX – Expanda spiral wound liner that did not impose any risk to the support structure of the nearby balcony.
Interflow used stabilised sand for backfill material to ensure there was no subsidence post-completion, as well as a vacuum truck for hydro excavation due to the vicinity’s existing underground services and the restricted space available.
The work was completed without incident and within a week, which is significantly faster than using a dig-lay-backfill method.
For more information visit the Interflow website.
If you have a project you would like featured in Trenchless Australasia contact Managing Editor Chloe Jenkins at cjenkins@gs-press.com.au