Innovative technology used in sewer renewal project

Interflow recently completed a sewer renewal project for Coliban Water, located along View Street in Bendigo’s CBD which is subject to high volumes of pedestrian traffic.

On initial inspection, the extent of the existing damage meant that a large section of the sewer required replacing via open trenching prior to relining.

Any excavation to the site would undermine the integrity of the support columns of a nearby heritage listed balcony structure, meaning significant structural support was required at considerable cost.

To remain economical, a temporary propping system was designed to ensure there was no risk of foundation movement or settlement of the site during and after works.

As an overall solution, the damaged section of the pipe was repaired and the sewer relining was completed by using SPR™ EX – Expanda spiral wound liner that did not impose any risk to the support structure of the nearby balcony.

Interflow used stabilised sand for backfill material to ensure there was no subsidence post-completion, as well as a vacuum truck for hydro excavation due to the vicinity’s existing underground services and the restricted space available.

The work was completed without incident and within a week, which is significantly faster than using a dig-lay-backfill method.

For more information visit the Interflow website.

If you have a project you would like featured in Trenchless Australasia contact Managing Editor Chloe Jenkins at

Convince your boss of the benefits of No-Dig Down Under!

These key facts will convince your boss that you need to attend one of Australia and New Zealand’s most important infrastructure events.

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2022 No-Dig Down Under to feature three-stream conference program

These five reasons make No-Dig Down Under an unmissable event

In its almost 20-year history, No-Dig Down Under has grown to become one of the most important, and largest, trenchless technology events in the world.

Taking place in Melbourne on 10–13 September, the event – supported by ASTT – will feature, a world-class conference program, the largest trade exhibition in the event’s history and training courses presented by international experts.

These five reasons make No-Dig Down Under standout as an unmissable trenchless event and as important as any no-dig event anywhere in the world.

1) Learn about how leading utilities are using no-dig methods in the conference

Asset owners play a vital role in the application of trenchless technology, which is why more than 40 per cent of the conference program consists of Australia and New Zealand’s leading utilities, operators and municipalities, including Sydney Water, Yarra Valley Water, Watercare, APA Group, Tas Gas Networks and Dial Before You Dig, as well as leading contractors such as John Holland, McConnell Dowell, Interflow and HDI Lucas.

The conference program, which was assembled from more than 130 paper submissions, also includes presentations on research and education into trenchless technologies from organisations such as the Water Services Association of Australia, Monash University and the University of Auckland.

Secure your attendance at the conference by registering today via the No-Dig Down Under website.

2) See the latest products in action in the exhibition hall

The exhibition will feature more than 100 of the world’s leading suppliers, manufacturers and service providers of the latest trenchless solutions for the installation, rehabilitation and location of underground infrastructure assets.

Many of these companies will be presenting practical demonstrations of their equipment, which is an important opportunity to see these products in action.

Make sure you set aside some time to walk through the giant hall (it might take you a while!) and grab a copy of the September edition of Trenchless Australasia for a guide on who to visit.

3) Celebrate the success of the industry at the Gala Dinner and Awards Evening

Arguably the most prestigious night on the trenchless calendar, this formal black tie event – sponsored by National Environmental Equipment (NATEE) – features the presentation of the biennial ASTT Awards, recognising and celebrating the achievements of the Australasian trenchless industry.

In total, five awards will be presented, honouring the rehabilitation and installation projects of the year; new technology; young person of the year; and person of the year.

Full conference registrations include access to the function, taking place on Thursday 12 September; otherwise, tickets can be purchased individually or as a table of 10.

4) Take advantage of invaluable networking opportunities at the social functions

In addition to the gala dinner, No-Dig Down Under will feature two more social functions, providing networking opportunities in a relaxed atmosphere.

On the evening of Tuesday 10 September, the exhibition will officially open with a ceremony, sponsored by Vermeer, with drinks and appetisers in the hall.

The opening is an opportunity to get a first glimpse of the exhibition hall and speak to exhibitors about their products and services before the general public the following morning.

Taking place the next evening, Wednesday 11 September, the Networking Reception – also sponsored by Vermeer – will be hosted on the bank of Melbourne’s famous Yarra River, opposite the city’s CBD, the reception is an opportunity to rub shoulders with the leaders of Australia and New Zealand’s trenchless industry.

Not only will the function feature great food, drinks and entertainment, but also a whiskey bar for those who are that way inclined.

5) Increase your trenchless knowledge by attending a training course

Originally developed by the North American Society for Trenchless Technology (NASTT), ASTT licensed the training courses and adapted them for Australasian audiences.

They are internationally recognised as the pinnacle of trenchless education and training, and offer an opportunity to be taught by global experts on the latest techniques and best practice.

In 2019, three courses will be presented: Cured-in-place pipe (CIPP) Good Practices Course, Horizontal directional drilling (HDD) Good Practices Guidelines Course, New Installation Methods Good Practices Course.

If you are interested in registering for the training courses, contact or visit

Organised by Great Southern Press, the publisher of Trenchless Australasia, No-Dig Down Under is made possible by the generous support of Platinum Sponsor National Environmental Equipment (NATEE); Gold Sponsor Vermeer; Silver Sponsors KRE Engineering, Pezzimenti Trenchless and Vivax Metrotech; and Bronze Sponsors Interflow, Smart Lock and Ashapura.

The event is proud to raise funds and awareness for its Charity Partner WaterAid.

For more information visit the No-Dig Down Under website.

If you have a project you would like featured in Trenchless Australasia contact Managing Editor Chloe Jenkins at

Australasian Trenchless Directory now online

The online directory, which was also distributed earlier in 2019 as a print publication, lists companies involved in the industry in alphabetical order, as well as in groups according to the products and services they offer.

The directory also includes important contact information for organisations such as utilities, municipalities and government departments.

Click here to access the online directory.

Listings in the directory are free and guaranteed for all ASTT members, as well as supporters of Trenchless Australasia magazine.

Companies who advertised in the directory have their listings highlighted with the addition of a company logo as well a description of the business.

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Interested in highlighting your company in the next directory?

The Australasian Trenchless Directory is updated on an annual basis to stay up-to-date with changes and developments in the industry.

To enhance your listing in the 2020 edition, including with the addition of a company logo and description, contact Great Southern Press Managing Editor Chloe Jenkins to discuss marketing opportunities at


NSW conference to dissect future projects

The 11th Annual NSW Major Project Conference, taking placein Sydney, Australia on 17–18 September 2019, will highlight the region’s largest infrastructure projects and upgrades and will involve more than 25 speakers and policy makers from government and the private sectors discussing the industry.

The conference comes at a pivotal time for the state, with a record of investment of AU$89.7 billion leaving NSW expecting to have more major infrastructure projects on the cards than any other state in Australia.

There will be a range of quality presentations, including a update on the WestConnex project and an in-depth review of the Stormwater Management and Road Tunnel – or SMART – system, presenting and innovative solution to flooding and traffic congestion.

There will also be a panel discussion on the Urban Congestion Fund, which seeks to reduce congestion in urban locations and has been allocated an investment of AU$4 billion over the next decade.

The panel will include TTM Consulting Director Mel Fyfe, Urbis Transport Advisory Associate Director Neill Miller, Transport for NSW Manager Walking and Cycling Strategy Sara Stace.

For more information visit the NSW Major Projects Conference website.

If you have an event you would like featured in Trenchless Australasia contact Assistant Editor Chloe Jenkins to discuss promotional opportunities at

Interflow using innovation to deliver Gladstone rehabilitation

To complete the project, pipeline renewal specialist Interflow is using a new liner, which is one of the company’s most robust and adaptable solutions to-date.

The liner has been specifically designed for installation through dips and bends in an underground asset.

According to the company, the liner is a simple method for restoring a pipeline’s structural integrity and hydraulic capacity, as well as preventing unwanted infiltration and exfiltration.

Interflow Project Manager Shaun Corrie said the new technology is already reaping benefits for the project and the client.

“Given most of the lines are consecutive, we can actually wind through manholes and cut out the liner,” he said.

“This has resulted in much faster productivity in terms of installation, without compromising the overall quality.

“As a consequence, the project will be delivered approximately three weeks earlier than programmed.”

There are two types of liners used for this project: both are installed by a mechanical process and do not require any curing, meaning the physical characteristics are unaltered during installation.

Unlike soft liners that require curing, there is no risk of any chemical leaks, which are harmful to the environment.

Not only does this reduce the product’s carbon footprint and minimise community disruption, it also creates a safer working space for operators.

Interflow Head Foreman Justin Norton these benefits contribute to a safer working conditions for his crew.

“I take safety with utmost respect, so it becomes foremost and number one,” he said.

“You need to start right from the bottom, all the way through to having safety control measures in place that protect crews and public.”

The project reflects Interflow’s vision of constantly pushing the status quo to meet and exceed expectations for key stakeholders.

Interflow Business Development Manager John Phillips said, “We are proud to be doing this work for this very important client and we’re able to mobilise our crew promptly to meet their expectations.

“The council has wisely chosen to combine the sewer and stormwater rehabilitation projects, which will ultimately lead to cost savings to the community.”

The works, which will extend the life of the council’s infrastructure by 100 years, commenced in April and are expected to be completed by August 2019.

For more information visit the Interflow website.

If you have company news you would like featured in Trenchless Australasia contact Assistant Editor Chloe Jenkins at

View the latest trenchless technology tenders

View the latest trenchless technology tenders

RFT for Lockerbie Main Sewer
Issued by:
 Yarra Valley Water
Closing date: 10 July 2019
Location: Victoria
Description: Design and construct project for Lockerbie main sewer works; 9 km long, 750 mm to 1,250 mm diameter.

Water main replacements: Torquay Road and Charles Street
Issued by:
 Fraser Coast Regional Council
Closing date: 11 July 2019
Location: Queensland
Description: Tenders are invited for the replacement of three existing water mains and one new water main in Hervey Bay. DN 200 asbestos cement water mains: SP1 – Torquay Road (Main Street to Hunter Street North and South side); and SP2 – Torquay Road (Queens Road to Denmans Camp Road). DN 200 cast iron and DN 100 asbestos cement water main: SP3 – Charles Street (Old Maryborough Road to Watson Street).

Water and sewer general works construction panel
Issued by:
 Central Coast Council NSW
Closing date: 16 July 2019
Location: New South Wales
Description: The council intends to establish a panel of contractors to undertake and deliver general construction works in relation to water and sewer assets under a standing offer arrangement based on AS2124 (Construction) conditions of contract for a four-year period.

Stormwater renewals – Devon Street West; Maranui and List streets
Issued by:
New Plymouth District Council
Closing date: 25 July 2019
Location: New Zealand
Description: The council has identified two sections of the stormwater drainage system that requires upgrading. The two sections are Section 1: Devon Street West, New Plymouth, and Section 2: Maranui/List Street, Welbourn.The scope includes the construction of new stormwater infrastructure by both open trenching and directional drilling, including connecting to existing stormwater assets, backfill, reinstatement and all testing.

Warragul Tyssen Street Treated Water Pump Station (TWPS) Upgrade
Issued by: Gippsland WaterClosing Date: 1 August 2019Location: Victoria Description: Construct tenders are invited for the Warragul Tyssen Street TWPS upgrade of DN 750 pipe works. This is a lump sum contract for the provision of all labour, material and site preparation works necessary for the construction of the pipe works for the TWPS at the Warragul Water Treatment Plant, including the supply and installation of mild steel cement lined pipework, valves and fittings.

Larrakeyah defence precinct redevelopment program
Issued by: 
Department of Defence
Closing date:
 9 June 2020
Northern Territory
 Laing O’Rourke is supporting the Department of Defence’s operations in the Northern Territory by delivering the Larrakeyah Defence Precinct Redevelopment Program as managing contractor. There are multiple works required, with an upgrade to existing sewerage infrastructure including three sewer pump stations and an upgrade existing stormwater infrastructure including diversion of existing stormwater via underground tunnel and new Gross Pollutant Traps. Expressions of interest are sought from businesses capable of performing the full scope, which can be obtained through the link.

CPBJHJV – West Gate Tunnel Project – any opportunities
Issued by: John Holland and CPB Contractors 
Closing date:
 30 June 2020
Location: Victoria
Description: The West Gate Tunnel Project is a city-shaping project that will deliver a vital alternative to the West Gate Bridge. Various civil construction and tunnelling works are required for this project, including services for building a 2.8 km eastbound tunnel and a 4 km westbound tunnel under Yarraville.

Each fortnightly edition of the Trenchless Australasia e-newsletter includes a list of tenders relevant to no-dig contractors, suppliers and manufacturers.

The information is provided by Australian Tenders, which is renowned for being an Australia-wide locally owned and operated tender notification service.

Australian Tenders is also offering readers of Trenchless Australasia an extra three months on their subscription plans. Email for more information.

For more tender information visit the Australian Tenders website.

If you have a tender you would like promoted in Trenchless Australasia contact Head of Editorial Nick Lovering at

Early bird discount for No-Dig Down Under closing soon

Taking place in Melbourne on 10–13 September, No-Dig Down Under will feature training courses presented by international experts, a world-class conference program and the largest trade exhibition in the event’s almost 20-year history.

Delegates that register before 12 July 2019 will take advantage of a discount of more than 15 per cent on the price of full conference registrations, which includes access the conference, exhibition, as well as No-Dig Down Under’s social functions, such as the prestigious ASTT Gala Dinner and Awards Evening, sponsored by National Environmental Equipment (NATEE).

In addition, registrants can also purchase access to the ASTT Training Courses, which will take place before the start of the event.

No-Dig Down Under is made possible by the generous support of Platinum Sponsor NATEE; Gold Sponsor Vermeer; Silver Sponsors KRE EngineeringPezzimenti Trenchless and Vivax Metrotech; and Bronze Sponsors Interflow, Smart Lock and Ashapura.  

The event is also proud to be raising funds and awareness for Charity Partner WaterAid.

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Is your company attending No-Dig Down Under 2019?

The September edition of Trenchless Australasia will be the official conference edition of No-Dig Down Under 2019, featuring special coverage, including detailed overviews of the event, previews and insights on exhibitors, as well as maps, the full conference program and other important information.

If your company is attending the event and would like to increase its exposure, contact Trenchless Australasia Head of Editorial Nick Lovering at


For more information visit the No-Dig Down Under website.

If you have an event you would like featured in Trenchless Australasia contact Assistant Editor Chloe Jenkins to discuss promotional opportunities at

McRobert inspects and relines deteriorated pump station

McRobert Contracting Services initially conducted a level two 3D laser scan of a sewer pump station in Mandurah, in the Peel Region of Western Australia in 2016.

The inspection revealed all internal concrete surfaces had been severely affected by biogenic sulphide corrosion. Significantly, it showed over 100 per cent of the concrete cover had deteriorated from the lower sections of the wet well walls.

In 2017, McRobert was subsequently contracted to complete the structural relining of the pump station inlet chamber and wet wells, using it’s patented relining methodologies.

The wet well walls ready for pH tests and reinforcement repairs.

Due to the extent of the deterioration, the contractor performed concrete and reinforcement repairs to the walls of the pump station, prior to installing rigid PVC as per the company’s patented whaler system. Initially, the walls were cleaned and loose corroded material from the walls was removed until only sound concrete remained.

pH testing was completed to ensure this was achieved. At this stage, McRobert completed a secondary laser scan to determine the true extent of the deterioration, which was illustrated to be significantly more than expected.

From the results of the laser scan, the company was able to accurately fabricate all required components for the structural relining.

Pump station prior to McRobert completing structural relining.


Steel reinforcement repairs were completed on the walls where reinforcement bars were exposed and corroded. McRobert’s lining system was then employed to cover the existing walls, essentially rebuilding the initial structure with a new 12 mm thick PVC lining and minimum 40 mm of grout between the existing concrete and new PVC wall.

A 3D point cloud illustration outlining data collected during the initial inspection of pump station.

The contractor then removed the original benching from the inlet chamber and wet wells, before fabricating and installing new benches made from a combination of both rigid and flexible PVC. All internal surfaces were now fully plastic lined and welded. Two penstocks were installed to the inlet chamber and all new gatic lids were retrofitted to the existing plastic-lined top slab.

Final touches

Finally, all internal plastic lined surfaces were spark tested, to ensure a 100 per cent complete gas tight seal within the pump station, ensuring complete protection from any further corrosion. McRobert provides a 50-year guarantee on all materials and workmanship completed as part of the company’s patented lining methodologies.

The inlet chamber with penstocks post-rehabilitation.

This article was featured in the March edition of Trenchless Australasia. To view the magazine on your PC, Mac, tablet, or mobile device, click here.

For more information visit the McRobert website.

If you have a project you would like featured in Trenchless Australasia contact Assistant Editor Chloe Jenkins at