PROJECT OVERVIEW.

RMS engaged Pezzimenti Tunnelbore to replace a 1.5m diameter 63m long failing corrugated steel culvert about 10 miles from where the dog sits on the tuckerbox – out of Gundagai, NSW.

Culvert Replacement Method Pezzimenti Tunnelbore Gundagai

Culvert Replacement Length Diameter Ground Pezzimenti Tunnelbore Gundagai

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.

Gundagai Culvert Replacement Pezzimenti Old Culvert

Existing Culvert to be replaced, beneath the Hume Highway

Gundagai Culvert Replacement Pezzimenti Old Culvert

Corrugated Steel Culvert to replaced

Gundagai Culvert Replacement Pezzimenti Old Culvert

Inside the existing steel culvert

Gundagai Culvert Replacement Pezzimenti Old Culvert DN1500 RCJP

DN1500 RCJP’s for the new culvert

Gundagai Culvert Replacement Pezzimenti Pipe Jacking

Pipejacking DN1500 RCJP’s

Gundagai Culvert Replacement Pezzimenti Shield

Launch of Digger Arm Shield

Gundagai Culvert Replacement Pezzimenti Digger Arm

Inside the shield, spoil and old culvert removed

Gundagai Culvert Replacement Pezzimenti Old Culvert Collapse

Reaching the weak point of collapse in old culvert

Gundagai Culvert Replacement Pezzimenti Old Culvert Collapse

Existing Steel culvert collapsed to nearly half height.

Gundagai Culvert Replacement Pezzimenti New Culvert

New culvert installed

Gundagai Culvert Replacement Pezzimenti New Culvert

New culvert installed

Gundagai Culvert Replacement Pezzimenti Slab

Jacking Frame slab left to easily form up head wall

Gundagai Culvert Replacement Removed Culvert

Damaged steel culvert after removal

Gundagai Culvert Replacement Pezzimenti New Culvert

Walking new culvert

Gundagai Culvert Replacement Pezzimenti Tunnelbore Case Study