Fulton Hogan’s outfall sewer project in Melbourne’s Kinley Estate overcame several challenges in ground conditions and traffic flow disruption thanks to Pezzimenti Trenchless’ laser guided microtunnelling techniques.

Open cut was not an option for this project due to possible disruption to traffic and residents. The project required full traffic flow during microtunnelling, including residents having access to their properties, and traffic both ways was enabled during the project due to its minimal footprint.

Fulton Hogan also had a limited permit to work on the road which meant a very tight program. Other challenges included groundwater, needing to maintain the very flat grade, and a transition in ground conditions from clay to siltstone, which required a change in cutters.

Pezzimenti also had to drill into the existing sewer line and stop drilling just 300mm away from the existing pipeline.

Innovative project solutions

In order to overcome these challenging conditions, the project used a laser guided microtunnelling technique. This was due to the depth of the outfall sewer and because the location required the sewer line to be designed along Hull Road in Lilydale and into the existing sewer.

Microtunnelling of 350m of 345mm OD Clover GRP pipe took place along and crossing Hull Road, into the subdivision, with bore lengths of 50m, 94m, 117m and 89m, and tunnelling through ground conditions such as clay and siltstone.

All bores and pipes were installed within a three week window, with depths ranging from 4.5m deep to over 7m in depth, with a design grade of 1:300. Pezzimenti’s experience, expertise and state-of-the-art laser-guided microtunnelling system helped ensure the project was a major success.

This Sponsored Editorial, is brought to you by Pezzimenti Trenchless. For more information, visit

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