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Scope:
GLE was subcontracted by Yarra Valley Excavations (YVE) and Safety Focused Performance JV (SFP) to provide specialised plant and experienced pipeline crews for the construction of the Yan Yean to Bald Hill (YYBH) water transfer pipeline. The project comprised 8 km of DN972 mild steel, cement-lined pipeline, designed to convey potable water from the Yan Yean Reservoir to a newly constructed storage facility at Bald Hill, Beveridge. The alignment was predominantly constructed via conventional open cut methods, traversing mixed geological conditions including reactive clays, rock, and water-impacted zones. Critical crossings beneath Merri Creek and the North East rail corridor were delivered using trenchless methodologies. These sections required the construction of deep launch and retrieval shafts, with excavations reaching depths of up to 13 metres. The trenchless pipe installation involved microtunnelling and auger boring techniques to maintain strict line and level tolerances while minimising environmental impact and avoiding disruption to existing infrastructure. The handling and installation of large-diameter steel pipe and associated fittings within constrained shaft environments necessitated the use of GLE’s large heavy-duty plant, outfitted with engineered lift management systems and load-handling controls. Complex temporary works designs, including engineered shoring boxes and bracing systems, were implemented to ensure stability of deep excavations and maintain compliance with all geotechnical and OH&S requirements. GLE’s integrated approach, combining specialised equipment and technically proficient personnel, enabled the safe and efficient execution of high-risk construction activities within tight programme constraints.
