Iplex Restrain

Restrain Sewer Pipe – made in Australia by Iplex

Since 1938, Iplex has worked with asset owners and contractors to find solutions for effectively repairing, rehabilitating or replacing existing pipelines while protecting the environment and local residents. 

Restrain™ Sewer Pipe  was specifically designed by Iplex for both new sewer networks and for the repair and replacement of underground gravity sewer infrastructure.

The need for a watertight, instantly restrained joint motivated Iplex to design and deliver Restrain – a PVC-U thread joint pipe with a rubber ring seal.

It is not your everyday threaded connection: it was designed for both trenched and trenchless installation.

Restrain is designed to keep boring diameters small while maximising flow, for long shot length with high push/pull strength and instant retention with a positive seal in the joint.

Restrain capitalises on the characteristic of PVC-U and is suitable for use in deep installations. The unique qualities of Restrain maximise the use of existing maintenance shafts as launching pits. 

Restrain is suitable for many different installation methods, including open trench and trenchless installations: such as horizontal directional drilling (HDD), auger boring or guided boring, micro-tunnelling and more. 

While previously imported, Restrain is now proudly manufactured in Australia, and meets strict national and product standards, and also has a positive WSAA appraisal.

Iplex has been recognised for its exceptional customer support and end-to-end capabilities and will be holding a technical webinar to allow customers to hear from the Iplex product & technical experts and also ask questions about Restrain.  The webinar will be hosted on Thursday 25 November at 11:00 am AEDT and will run for approximately 40 minutes.

Click here to register. 

For more information visit the Iplex website. 

Snells Beach, Warkworth region

Warkworth works progress despite lockdown

Contractors are currently completing works on a major $26 million wastewater pump station in Lucy Moore Memorial Park. 

Project manager Dirk du Plessis is asking the public to be aware of increased traffic as contractor McConnell Dowell ramps up construction activity. 

“We are very pleased to see that works are well underway,” said du Plessis.

“We’re aware the warm weather is bringing people outside and we’d like to remind them to stay alert and take notice of extra truck movements in coming months.” 

According to Watercare, Warkworth – a region 64 km north of Auckland – is expected to grow significantly in population, with up to 20,000 people migrating to the area over the next few decades.

The new pump station is the first in a series of municipality projects designed to cater for growth and improve water quality in the Mahurangi/Warkworth region. 

The next phase of the project will involve the construction and installation of a new 5 km transfer pipeline and wastewater treatment plant in Snells Beach/Algies Bay,  expected to commence next year. 

Tunnelling will be carried out deep underground by direct pipe tunnelling — a method that was successfully deployed by McConnell Dowell on the Snells-Algies wastewater outfall. 

The Warkworth wastewater scheme is expected to be completed in 2024. 

For more information visit the Watercare website. 

Killard building Shoalhaven one pipe at a time

Shoalhaven Water provides water services throughout its local government area of Shoalhaven. 

The utility provides safe, clean drinking water, as well as treats wastewater to ensure the best outcomes for the community and the environment. 

After weeks of vigorous planning, the project finally kicked off on Monday November 8 and will continue into February 2022.

According to Killard spokesperson, specialised bridge units have been sourced alongside on-water barges with punts that will ensure safe and effective works are implemented throughout the duration of the contract.

Killard Group is a large multi-functional infrastructure company based in Sydney with expertise in the fields of site development, systems installation, culvert remediation, culvert rehabilitation and much more. 

The company provides service to its clients with accredited quality, OHS, and environmental systems, implemented and maintained as one integrated management system.

Included in these works are strategic plans to remove the old, outdated asbestos line, which is currently still active.

The management crew leading this project includes project manager Michael Pfeil and project engineer Liam Shephard.

For more information visit the Killard Infrastructure website.

watercare wastewater scheme upgrade

Watercare upgrades wastewater scheme in north Auckland

According to Watercare, Warkworth is expected to grow significantly in population, with up to 20,000 people migrating to the area over the next few decades.

The utility is undertaking a number of significant wastewater infrastructure projects to accommodate this anticipated growth, one of which is the Warkworth to Snells transfer pipeline. 

Watercare is tunnelling more than 5 km of new pipeline from Lucy Moore Memorial Park to the new wastewater treatment plant in Snells Beach.

Tunnelling will be carried out deep underground by direct pipe tunnelling — a method that was successfully deployed on the Snells-Algies wastewater outfall. 

The Snells-Algies wastewater pipe and outfall was constructed back in 2020 as the first phase of a three-stage scheme to supply the Warkworth and Mahurangi East communities north of Auckland. 

Warkworth wastewater map. Image: Watercare
Warkworth wastewater map. Image: Watercare

Micro-tunnelling expert McConnell Dowell was awarded the design and construct contact by Watercare in March 2019. 

The project set a new world record for the longest direct pipe drive by a micro-tunnel boring machine (MTBM), reaching 2021 m – a whole 92 m further than the previous record set by McConnell Dowell in 2018. 

The Warkworth to Snells pipeline will be delivered in conjunction with the Lucy Moore Memorial Park wastewater pump station and the Snells Beach wastewater treatment plant. 

The Warkworth wastewater scheme is expected to be completed in 2024. 

For more information visit the Watercare website. 

85 years of Interflow

Interflow celebrates 85 years

Throughout its history, Interflow has pioneered technologies and renewal methods that have been well received for their innovation.

The company was founded in 1936 by Harold ‘Bill’ Weaver, whose mission it was to support the growth of budding communities along the east coast of Australia.

Weaver and his original team at Interflow constructed water, sewerage and drainage systems for developing towns, earning him a reputation as a change maker.  

His ability to identify gaps in the market and develop services to meet the needs of his customers allowed him to expand the company’s operations across the country. 

Since the 30s, Interflow has been generation-led and family owned, with leadership handed down from father to son now over three generations 

From proactive asset management to emergency repairs, the company is dedicated to developing bespoke solutions that satisfy its customers’ needs: robust, sustainable pipeline infrastructure that will service the growing requirements of the community for generations to come.

As early as the 1990s, interflow pioneered the use of trenchless technology to improve efficiency, reduce costs and minimise impact to the environment and community. 

Interflow 1991
In 1991, Interflow signed its first 20-year exclusivity deal with partners Rib Loc.trench

In 1991 – 30 years ago – the company signed its first 20-year exclusivity deal with partners in innovation Rib Loc. 

Together, the companies provided hundreds of local councils and water authorities with industry-leading pipeline infrastructure services, restoring assets for an expected period of 50 years. 

The companies continue to share a working relationship today. 

Today, managing director and Bill Weaver’s grandson, Geoff Weaver, is responsible for the company’s operations, establishing an international foothold in New Zealand, and negotiating two twenty-year exclusive Australasian licenses for spirally wound rehabilitation products. 

At 85 years, Interflow is Australia’s largest provider of Trenchless pipeline solutions, establishing itself as the preferred delivery partner within Australian markets. 

Geoff Weaver said the company’s ongoing success has been guided by the core values laid out by his grandfather. 

“My grandfather’s ethos was simple. He was committed to challenging the status quo and finding new and better ways to do things,” he said.

“Each generation of leadership has been responsible for refining these methods and developing new technologies to further improve the experience of our customers and communities.”

Interflow now employs over 600 people across Australasia, and the company continues to expand the range of services it provides. 

“As we celebrate this incredible milestone, we look forward to the next 85 years of supporting our customers and uplifting communities with pipeline infrastructure solutions for generations to come,” Weaver added.

For more information visit the Interflow website. 

Lockerbie Sewer Mains Project

YVW works with elders on Lockerbie Sewer Main

Construction activities commenced in March 2020 for the 9 km sewer pipeline between Donnybrook and Beveridge, with the sewer expected online by the end of the year. 

The Victorian Planning Authority is predicting that by 2050 the area will be home to around 300,000 people , and the pipeline is expected to cater for this population growth. 

The Lockerbie Main Sewer will collect and transfer sewage flows from a majority of the proposed new developments and communities in the Donnybrook, Beveridge and Lockerbie area.

The joint venture (JV) has engaged extensively with the Wurundjeri Woi Warring Cultural Heritage Aboriginal Corporation to identify the potential impact excavation may have on culturally sensitive areas. 

The collaboration included a 12-month cultural salvage program involving a combination of hand and mechanical archaeological digs to identify, record and preserve artefacts and ensure the area remained protected for generations to come.

Nina Braid is the Aboriginal partnerships manager at Yarra Valley Water. 

“At Yarra Valley Water we are committed to reconciliation and building the trust understanding with Traditional Owners as part of our commitment to helping communities thrive,” said Braid. 

Darren Wilkins is the delivery manager of capital projects and utilities with Ventia. 

“This area has high level ground wanter content, so the communities traditionally used to meet in these areas,” said Wilkins. 

“Before we even started onsite, those areas of potential significance were roped off – they’re no-go zones for us.”  

Wilkins said that if the operators were to find anything of potential significance in areas deemed to be clear, the team must stop work immediately and notify the local elders. 

The pipeline will be constructed along the western side of the Melbourne-Sydney railway line north of Minton Street, then crosses the railway line and hugs the eastern side of the rail line to its southern end in Donnybrook.

Yarra Valley Water said the Traditional Owners’ connection to country influences the way the company works and engages with the land. 

Construction is expected to be completed in late 2021 and the completed Lockerbie Main Sewer will begin operating in late 2021.

For more information visit the Yarra Valley Water website. 

Interflow and Metrocorp will complete works on large diameter pipelines

Interflow, Metrocorp joint venture

The Critical Sewer Solutions partnership will focus on rehabilitation works within the large diameter waste market throughout the Greater Sydney region.

The partnership will enable both contractors to deliver key design, construction, maintenance and facilities management for the region’s growing population. 

Interflow and Metrocorp have shared a working relationship since 2017 when the companies completed works on Sydney’s second largest sewer. 

Earlier this month, the partners received the New South Sales Excellence in Concrete Award 2021 from the Concrete Institute of Australia, alongside Sydney Water and SASTTI joint venture for their work on the restoration and retrofit project. 

Large diameter sewer pipelines are underground infrastructure giants relied upon by millions of people to keep their cities functional and hygienic. 

As they age, pipelines require specialist attention to restore them to their optimal working condition. 

The partnership will leverage both Metrocorp’s remedial engineering expertise and Interflow’s experience in trenchless pipeline infrastructure to create a one-stop-shop for water authorities faced with ageing wastewater assets. 

By combining Interflow’s long history of customer problem solving with Metrocorp’s philosophy of high standard workmanship, Critical Sewer Solutions is set to reinvigorate Sydney’s critical sewers. 

For more information visit the Interflow website. 

Aussie Trenchless protects stormwater culverts

Ahead of the curve

The team at Aussie Trenchless is passionate about progressing future infrastructure opportunities and accomplishing superior outcomes. Headquartered in New South Wales, Director Chris Meredith and the team are committed to pioneering state-of-the-art solutions and furthering businesses in the trenchless industry.

Founded in 2014, the company offers a range of unique products in Australia and internationally. Mr Meredith is something of an industry mogul, with 40 years in utilities and having pioneered the development of several well-known rehabilitation methods through decades of contracting.

Throughout his years in the industry, Mr Meredith has seen significant growth in the implementation of trenchless solutions in Australia and abroad. He and his team offer practical advice to infrastructure owners and contractors on a variety of underground pipeline rehabilitation techniques.

Importantly, they offer hands-on service for industry contractors backed by years of expertise. They have developed multiple complementary technologies for underground service installation.

Aussie Trenchless stormwater culverts
PST is specifically designed for traversable trunk sewers and stormwater culverts


Pipe segment technology (PST) is one solution for pipe rehabilitation that is easy to build and fast to install. It is specifically designed for traversable trunk sewers and stormwater culverts.

Pipe lining technologies have the capacity to substantially increase the service life of pipes, and this method is ideal for man entry pipeline rehabilitation for gravity sewer mains. Installation can take place in low flow conditions, and the technology has low capital costs and a small site footprint.

PST lining panels are made of polypropylene material, providing a smooth surface with effective hydraulic performance capacities. Significantly, PST is semi-transparent, mitigating risk and removing guesswork during the completion of gap grouting works.

PST panels are lightweight, easy to install, and ideal for positioning in tight locations, with the product suitable for all pipe types, including round, ovoid and box culverts. Segment pipe rehabilitation technologies are recommended for sewers with complicated and nonstandard shapes.

Lining segments reflect the shape of the host pipe and therefore can be both circular and non-circular. Lining of access chambers can also be achieved using PST segments.

The ring stiffness of PST can be enhanced or altered by attaching circumferential bars, making the product suitable for installing in deep sewers. PST is a nimble segmental lining system with a grouted annulus gap, versatile in tight access locations.

A static design is completed to verify conformance of the PST lining structure in these types of applications. The technology does not require advanced installation machinery and has been used to rehabilitate deteriorated stormwater and sewer culverts.

For more information visit the Aussie Trenchless website. 

Construction site closure

Melbourne construction set to resume 5 October

Major trenchless and tunnelling works have ground to a halt across Melbourne since the Victorian Government’s announcement of the mandatory closures last Tuesday. 

Victoria’s Big Build has suspended works across some of the state’s biggest projects in metropolitan Melbourne, City of Ballarat, City of Greater Geelong, Surf Coast Shire and Mitchell Shire. 

These include works on the West Gate Tunnel Project as well as the Metro Tunnel Project, set to be completed in 2025. 

Big Build said it would be working closely with its building parters to comply with construction-related public health orders for when works recommence. 

This includes implementing strict measures to minimise workforce close contacts, such as staggered shifts and industry consultation to implement COVIDSafe meal and rest-break arrangements for our workforce.

Limited exemptions have been available to enable some workers to attend sites to respond to emergency or perform urgent and essential work.

Across town, Central Highlands Water (CHW) been issued an exemption for the Ballarat Sewer Build, which was declared a critical water infrastructure project. 

CHW said workers on the Ballarat Sewer Build are subject to the same requirements as construction workers across the entire industry regarding vaccination. 

All sites will be required to demonstrate compliance with the Chief Health Officer Directions prior to reopening on 5 October, including evidence of first vaccine dose. 

For more information visit the Victorian Health Building Authority website. 

Watercare Central Interceptor TBM

Watercare projects pick up

Watercare’s projects have picked up across Auckland City, with works resuming on the NZD$1.2 billion (AUD $1.14 billion) Central Interceptor wastewater project.

Work came grinding to a halt after Auckland was placed under level 4 restrictions last month, under which only minimal work involving the two Central Interceptor tunnel boring machines (TBMs) were allowed to continue to prevent sinking and damage.

Water executive program director Shayne Cunis said the team is enthusiastic to be ramping up work again.  

“We had only just launched our main TBM Hiwa-i-te-Rangi before we went into level 4, and there was significant work required to complete on-site assembly as she progressed forward,” said Cunis.

“We have managed to keep her inching forward at a minimum rate, and, as of the end of alert level 4, we have installed 18 of the 9008 concrete rings of the Central Interceptor.” 

Cunis said that anyone who is not essential onsite will still be working from home.

“As we move into alert level 3, we will increase our production to target rates over the coming weeks, while ensuring we are looking after our team’s health, safety and wellbeing as the majority of them return to work. 

“We have enhanced COVID-19 management protocols which include mask wearing, maintaining strict work bubbles, carrying out daily temperature checks for all site staff, and disinfecting all overalls every day.”

Works are also picking up in the second stage of the Papakura Water Treatment Plant, which will provide up to 12 million litres a day from Hays Creek Dam when it is completed early next year.  

Works will also proceed on the new Mairangi Bay wastewater pump station, Clevedon’s new water and wastewater network, the replacement of the Huia 1 water main, where works are underway in Mt Albert and the Pukekohe Wastewater Treatment Plant upgrade.

For more information visit the Watercare website.

Asset Training helps operators undergo verification

Australia’s first online drain cleaning refresher

Aqua Assets provides water and waste management services to businesses in the utility, construction, engineering and trade sectors.

Services include civil works, non-destructive digging, vacuum loading, CCTV, drain cleaning and pipeline rehabilitation.

Aqua Assets subsidiary Asset Training is specially dedicated to providing training in water and waste management and industrial maintenance services.

This registered training organisation (RTO) primarily focuses on work safety, backed by vocational educators who are passionate about the level of instruction they provide.

Operating since 2006, Asset Training is an award-winning RTO dedicated to providing safe work training.

For more than 15 years, the company has continued to grow its portfolio of industry-specific trainers who collectively have more than 40 years of combined industry experience.

Asset Training has recently launched a new online drain cleaning refresher – a short course achievable in less than a week, reinvigorating the individual on the relevant drain cleaning unit of competency.  

While COVID-19 has restricted many industrial maintenance businesses from accessing the training they require, Asset Training has adapted its curriculum to help operators maintain their nationally accredited compliance standing remotely.

The Online Drain Cleaning Refresher course recognises the current restraints placed on businesses, providing a new level of accessibility through the online training course.

Drain cleaning operators are required to undergo verification of competency or refresher training at appropriate intervals not exceeding two years.

The Online Drain Cleaning Refresher course uses the MSMWJ302 system to assess the competency knowledge of the drain cleaning operator.

The operator is then practically assessed through document and video submissions, and if successful, is re-certified as competent to perform their responsibilities.

Refresher training is required by industry, and the training offered by Asset Training is nationally recognised, up to date, and of the highest quality.

The training comprises both theoretical and practical components and the theory includes five online quizzes with a pass/fail grading.

Each quiz is supported by a video lesson that students can view before submission, and students are given two attempts for each question.

There are two types of practical assessments: there are a series of site safety documents that must be submitted (some of these may be work documents that can be completed on the job), and videos must be taken demonstrating students carrying out practical tasks. These will need to be uploaded and reviewed by an Asset Training assessor.

A refresher has a two-year limit, and an allowance of two months is given for students to complete all assigned tasks.

Operators must submit all assigned tasks at least two weeks prior to their two-year refresher date to ensure a new Statement of Attainment can be issued in time.

Asset Training has dedicated time and resources to developing successful bridging courses and the organisation can provide experienced operators with the opportunity to upgrade their training to the next level.

Asset Training is now offering one-day bridging courses for those seeking to upgrade their High Pressure Water Jetting (HPWJ) qualifications, vacuum loading and drain cleaning skill sets as well.

Asset Training says it expects water utilities and pipeline maintenance companies, plumbers, and local councils will greatly benefit from the new level of accessibility offered by these courses.

For more information visit the Aqua Training website. 

Bohrtec machine guides sewer works

Bohrtec machine guides sewer works

In 2019, Downer Pipetech was engaged by Sydney Water to install 870 m of 226 mm uPVC sewer main for the future developments in the Spring Farm residential area of New South Wales.

With the project requiring the completion of 10 under bore sections, Downer engaged auger boring specialist Bortec Laser Bore from Narellan NSW, which uses machines from expert German supplier Bohrtec.

During consultations with experts from Germany, it was noted that geotechnical reports indicated displaceable soft sand, non-displaceable stiff clays and soft sandstone would be encountered.

These ground conditions suited either the Bohrtec pilot tube system for the displaceable soil, or the Bohrtec 406 mm FrontSteer system for the non-displaceable ground.

Although Bortec Laser Bore possessed both a Bohrtec BM 400 LSC and a Bohrtec 400 LS, it was decided the LSC machine would be better suited to the launch shafts due to its more compact design.

Bohrtec machine guides sewer works
Pits 10 and 11 – shoring boxes 6 m x 3 m; FrontSteer method. Image courtesy of Bohrtec


While the project proponents had top-quality Bohrtec machinery at their disposal, the works were not without their challenges and a range of equipment was required.

The required bore lengths ranged from 69 to 111 m and encompassed a total of approximately 830 m of boring across the project, while the launch shafts ranged from 6 to 13 m in depth.

Due to changing ground conditions, the pilot tube method was used in the softer displaceable soil, and the FrontSteer method was used in the harder non-displaceable clay and soft sandstone areas.

This method has both vertical and horizontal steering capabilities with an accuracy of up to ± 25 mm for drive of a length up to 100 m.

The connection point for the sewer was into an existing sewer access chamber 13 m deep in the middle of a roadway.

Bortec and Downer discussed the possibility of directly boring into the existing manhole and eliminating the excavation of the roadway to a connection, and Downer agreed to set up a platform in the existing access chamber in the roadway and internally core out a 600 mm core hole where the bore was to come out.

Bortec was able to use the pilot system to move through the soft sand and, with the use of the optical guidance system, could come out directly in the centre of this core hole.

Afterwards, the hole could be upsized and bored in the 406 mm steel pipes.

Manholes up to 13 m deep were constructed with tight access, with flat grades ranging from 0.45 per cent to 0.65 per cent with minimal tolerances between the bores.

A DN 406 mild steel casing was installed, with the DN 225 uPVC carrier pipe then inserted inside.Centralisers were also installed at 3 m minimum intervals, while the annulus between the uPVC and steel casing pipe was grouted.

Vacuum testing and CCTV of the installed sewer were conducted and all spoil and slurry from the launch pit was removed.

The project was completed successfully and within budget, with no recorded safety incidents, while the connection made to the existing access chamber was made without the need to excavate the surrounding roadway.

Thanks to the technical assistance from Bohrtec, the optical guided system was successfully employed when using either the pilot tube or FrontSteer systems in order to maintain grade and alignment as per design.

For more information visit the Bohrtec website.



Boretech D24x40S3 for Vermeer WA & NT

Boretech leading WA’s HDD utility installations

WA-based Boretech Contracting started as an installer of underground services for Telstra and the National Broadband Network but has since expanded and secured long-term horizontal directional drilling (HDD) contracts for a range of utility projects.

Read more