Canning Hwy DN600 Cast Iron Pipe Replacement

• The design alignment of the pipeline meant that the works had a direct impacted on local residents. To mitigate this, a moving working front was adopted. This allowed the length of road affected at any given time to be minimised, and reduced the duration of direct impact on each resident.
• A key consideration was that the main distribution pipeline crossed Canning Highway in two locations with a minor reticulation cross connection being required in a third location. DM Civil used a mixture of trenchless technologies to successfully complete these three crossings. The trenchless technologies utilised included microtunnelling to install the new DN600 MSCL in a DN800 steel casing, Piloted Auger Boring to install the new DN400 MSCL in a DN650 street casing, and Horizontal Directional Drilling to install the new DN125 PE cross connection.
• With the number of crossings as well as parallel existing services, large sections of the design had to be modified during construction to protect the integrity of the existing assets and to avoid alignment clashes. DM Civil worked with Water Corporation and the designer to find solutions in each instance, including implementing vertical and horizontal alignment design changes as well as facilitating both temporary and permanent relocation of existing services.
• High traffic volumes on Canning Highway required the replacement main to be run through the back streets resulting in many horizontal and vertical bends, fittings, air valves, scour valves and associated earthing systems being added. With three crews working on the project within a localised area, a coordinated approach to traffic management was required to ensure that the detours did not conflict and the works were navigable. A dedicated resource was required to coordinate this.This project was a part of an ongoing program to replace aging water supply assets and to improve the capability of the existing network to ensure supply continuity and to support future growth.

This project was a part of an ongoing program to replace aging water supply assets and to improve the capability of the existing network to ensure supply continuity and to support future growth.