The Sydney Water Networks Alliance designed and managed the construction of a 900mm watermain extension designed to supply water to new release areas around Oran Park. The design specified the microtunnelling for a Ø1350mm butt jointed concrete jacking pipe. As the shale was competent it was decided to freebore the Ø1550 microtunnel and insert the concrete pipes afterward.

SWGC Microtunneling Method Free Pipe

SWGC Microtunneling Diameter Length Ground

Custom Design and Manufacture

Custom Design & Manufacture – Ø1550 Head. A new Ø1550 head was built and commissioned for the project. All components were designed and manufactured in-house by Pezzimenti LaserboreTM. After commissioning, the head achieved production up to 45m per day in the shale.

Transporting Spoil by Auger and Bucket Elevator

The spoil was transported back along the bore by an enclosed auger system and lifted to the surface by a bucket elevator. After a breakdown 10m from the end, the bore was completed using the intercept method from the upstream end.

Spring Farm Microtunneling Setting Up Jacking Frame

Pouring a thrust block behind the jacking frame.

Spring Farm Microtunneling Pezzimenti Site

Equipment around the shaft. Cranage was be excavator.

Spring Farm Microtunnelling Pezzimenti Auger Extraction Bucket Elevator

Bucket elevator feeding the dump truck.

Spring Farm Microtunneling Excavator Bucket Elevator

Overall view of site. The ground conditons were dry enabling the spoil to be removed with minimal water input.

Spring Farm Microtunneling Case Study Download