PROJECT OVERVIEW.
Culvert Replacement
The culvert appeared to have been installed in two sections – the latter when the Hume Highway was widened. A weak point in the centre had collapsed to less than half diameter making it unsuitable for relining or sliplining.
An 1800 diameter jacking shield (sized for a DN1500 Reinforced Concrete Jacking Pipe) was used to surround the failed steel culvert – providing support while the old culvert is removed.
Pipejacked Culvert Installation with continual Ground Support
The new DN1500 RCJPs were pipejacked (installed) immediately behind the shield to provide continual support of the ground while the old culvert was removed.
The end result is a brand new, concrete water tight culvert in place of a failing corrugated steel culvert without open cutting the highway.
Existing Culvert to be replaced, beneath the Hume Highway
Corrugated Steel Culvert to replaced
Inside the existing steel culvert
DN1500 RCJP’s for the new culvert
Pipejacking DN1500 RCJP’s
Launch of Digger Arm Shield
Inside the shield, spoil and old culvert removed
Reaching the weak point of collapse in old culvert
Existing Steel culvert collapsed to nearly half height.
New culvert installed
New culvert installed
Jacking Frame slab left to easily form up head wall
Damaged steel culvert after removal
Walking new culvert
