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Replacing critical sewer rising main infrastructure beneath the Nowra Bridge as part of the Princes Highway upgrade.

Transport for NSW / Nowra Bridge Upgrade Program

Nowra, New South Wales

[Project Background]

Critical Sewer Infrastructure Upgrade within Major Bridge Project

As part of the Princes Highway Nowra Bridge upgrade, significant infrastructure works were undertaken to improve transport connectivity across the Shoalhaven River. The project included the construction of a new four-lane bridge and repurposing of the existing bridge structures.

To support these works, the North Nowra Surcharge Sewer Main installed beneath the original bridge in 1981 required replacement. Killard was engaged to deliver the upgrade and installation of the new rising main infrastructure while maintaining safe operations within the bridge construction environment.

[Scope Of Works]

Operating in Sensitive and Live environments

Replacement of ageing surcharge mains infrastructure supporting the Princes Highway bridge upgrade project.

Installation of DN300 DICL and OD560 HDPE sewer pipelines

Construction of 350m OD505 steel surcharge main beneath the existing bridge structure

Removal and disposal of existing asbestos sewer infrastructure

Connection and commissioning of new sewer mains within the live network

Project Technical Snapshot

Replacement of aging sewer surcharge infrastructure across the Nowra Bridge corridor.

350m Steel Sewer Rising Main

Pipe Materials

DN300 DICL · OD560 HDPE · OD505 Steel

Bridge Installation

Pipeline installation beneath the existing bridge structure

[Outcome / Key Features]

Enabling Works for Pump Station Replacement

Outcome

Installation of 350 metres of OD505 steel sewer rising main beneath the existing Nowra Bridge
Installation of additional DN300 DICL and OD560 HDPE pipelines within the network upgrade
Integration and connection to the North Nowra surcharge sewer network
Removal and off-site disposal of existing asbestos cement mains

Key Features

Innovative installation methodology developed for pipeline installation over water
Bridge-mounted scaffolding and bridge-specific elevated work platforms (EWP) used for construction
Specialised engineered brackets and rollers used to guide the pipe across the bridge span
Winch systems and fabricated steel cone used to safely manoeuvre pipe sections during installation
Custom expansion joints designed to accommodate bridge movement due to temperature changes
Removal of existing asbestos pipeline using floating barges, EWP and spider crane

[Environmental Responsibility]

Managing construction within a river crossing environment

Construction activities were carefully managed to minimise impacts on the surrounding river environment and bridge operations. Controlled installation procedures and safe removal of the existing asbestos pipeline ensured the surrounding waterways and infrastructure were protected throughout the works.

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North Nowra Surcharge Main Upgrade

Nowra, New South Wales

Critical Sewer Infrastructure Upgrade within Major Bridge Project