Central Interceptor celebrates breakthrough

Micro-tunnel boring machine (mTBM) ‘Domenica’ has finished its first drive, successfully breaking through at the Haycock Ave shaft on 10 December.   

Domenica was placed in a 2.1 m diameter pipe for the link sewer that will run between Miranda Reserve in Avondale to the main Central Interceptor wastewater tunnel, connecting up at May Rd in Mt Roskill. 

Once complete in 2026, the Central Interceptor will store and transport both stormwater and wastewater to Watercare’s Māngere Wastewater Treatment Plant, preventing wet-weather overflows and significantly cleaning up Auckland’s waterways.

Watercare delivery manager Chris McCarthny said the process has not been the post seamless for the team. 

“We started tunnelling from our 55 m deep May Rd shaft on this first section of the link sewer in June,” said McCarthny. 

“Domenica was making great progress, working 24 hours a day, five days a week and laying up to 15 metres of pipe a day. And then Covid-19 threw a spanner in the works.”

Work was placed on hold for one day as Auckland entered alert level 4 in August before the project received a crucial exemption.

“With this method of tunnelling called pipejacking, where the micro-TBM and all of the pipes are pushed along from the base of the launch shaft, the machine can get stuck if it sits stationary for too long,” McCarthny explained.

“When we entered lockdown, Domenica was in almost the worst possible position – more than 70 m below the ground and in the middle of residential Mt Roskill – so it was critical to get her up and running again so she didn’t get stuck.” 

The Central Interceptor project operated under a skeleton crew during level 4 restrictions to keep the mTBM moving forward, covering just half a metre a day. 

“Thanks to the incredible people on the project, we were able to implement our level 4 protocols within 48 hours of the announcement and continue tunnelling, avoiding the potentially disastrous consequences of a stuck machine.”

This is the first of many anticipated breakthroughs on the five-year tunnelling project, and according to executive program director Shayne Cunis, the team is pleased to have completed the milestone ahead of Christmas. 

The mTBM will now be retrieved from the shaft at the Haycock site and serviced before it is launched again next year. 

From there, ‘Domenica’ will begin a 720 m journey back to Haycock Ave from the Dundale Ave site in Blockhouse Bay. 

Meanwhile, the Central Interceptor’s main mTBM ‘Hiwa-i-te-Rangi’ launched back in July has laid more than 145 rings and traveled more than 240 m of its 14.7 km journey. 

Hiwa-i-te-Rangi is expected to start tunnelling deep beneath the Manukau Harbour in winter next year.

For more information visit the Watercare website. 



Ballarat Sewer Build Stage 1 complete

Central Highlands Water (CHW) has successfully completed Stage 1 of the Ballarat Sewer Build. 

Stage 1 of the project commenced in April 2021 and required an investment of more than $25 million into the Ballarat region. 

The team at CHW faced many challenges throughout the project including construction interruptions due to COVID-19 and severe weather events, and the company thanked the community for its ongoing patience and understanding. 

“The understanding shown by both our business community and residents has made a highly complex project achievable,” a spokesperson for the company said. 

Stage 1 of the project saw the installation of around 1 km of sewer pipe, between4 and 6 me beneath the CBD, along Peel Street, Eastwood Street and Anderson Streets and East and West. 

The construction process involved the compaction of more than 13,000 t of rock and two micro-tunnels bored beneath critical traffic intersections. 

Microtunnelling techniques were used where possible to minimise ground disturbance; however, attempts at Little Bridge Street were unsuccessful due to unstable ground conditions and open-trench methods were necessary. 

Around 220m3 of concrete was poured in the three large sewer connections made into the existing network.

The project took the CHW a total of 22,000 working hours. 

Stage 2 of the Ballarat Sewer Build will cover White Flat Oval to Rest Street, and is expected to commence in 2022. 

When all stages are complete, the Ballarat Sewer Build will duplicate the existing sewer line from Ballarat East to South. 

According to CHW, the pipeline duplication will service the community for another 100 years. 

For more information visit the Central Highlands Water website. 

Central Interceptor’s 18 gantries slotted

Central Interceptor’s 18 gantries slotted

The TBM was launched in July, with gantries being lowered into the shaft as tunnelling progressed since the launch.

The Central Interceptor TBM, known as Hiwa-i-te-rangi, is now 190 m in length.

Each gantry will store the equipment required to run the TBM which will build New Zealand’s longest bored wastewater tunnel.

The gantries will include equipment such as electrical supplies, conveyance, segment feeders and segment erectors.

The gantries are even fitted with lunchrooms and toilet facilities, as well as a refuge to be used in emergencies.

Ghella Abergeldie Joint Venture (GAJV) is part of the construction of the tunnel as the delivery team.

GAJV tunnel manager Michele Petris said he welcomed the announcement.

“Completing the assembly of the tunnel boring machine was a good way to finish this very weird year,” Petris said.

The Hiwa-i-te-rangi TBM is now finished underground as the final gantry was slotted into place.

An acoustic shed is being constructed above the launch shaft to reduce noise and strict COVID-19 safety protocols are being followed.

The Central Interceptor is New Zealand’s largest ever wastewater project.

It comprises close to 20 km of tunnels, 19 shafts, a major pump station and considerable wastewater management and network infrastructure works.

The project plans to run underground from Grey Lynn to Watercare’s Māngere Wastewater Treatment Plant.

For more information visit Watercare’s website.

Pipe Core Vertiliner

DN2000 manhole rehabilitation with Vertiliner

Vertiliner – a relining solution offered by Pipe Core – is an innovative trenchless method for rehabilitating dilapidated wastewater manholes.

D&S Rohrsanierung had record-breaking success recently when the company installed a new inner lining to a DN2000 pumping station manhole using the Vertiliner system. 

The 6 m deep pumping station manhole was located in an industrial area in Gochsheim, Germany, and was used to manage incoming mixed water to ensure it flowed correctly down to the sewage treatment plant.    

Manhole before installation of Vertiliner
Manhole before installation of Vertiliner. Image: Diringer & Scheidel Rohrsanierung
Manhole after installation of DN2000 Vertiliner
Manhole after installation of DN2000 Vertiliner. Image: Diringer & Scheidel Rohrsanierung

Over time, rehabilitation became necessary as well as an upgrade to a more sophisticated system.

Conventional relining technologies may have required excavation on the site, which would have been time-consuming, costly, and would have necessitated a period of decommissioning of the pumping station.

To circumvent these interruptions, the Vertiliner® system was the cost-effective and logical solution.  

Made of high-quality GRP liner, Vertiliner is a seamless tube, impregnated with a light-cured synthetic resin that is inserted into a manhole and then cured using UV light to form a new inner relined surface on the manhole. 

The unique system is custom made off-site using the manhole measurements, and it accommodates the various changes in cross-sections present in the manhole.

Ahead of the installation job, the team set up a sewage diversion, cleaned and removed protruding objects from inside the manhole, as well as treated the bottom of the manhole with a sulphate-resistant mortar. 

Due to the scale of the project, the team also took special safety precautions to ensure the liner packer, which was also custom made, was secure by setting up a large water tank around the manhole to hold it in place. 

The Vertiliner arrived on-site wrapped in a UV-resistant and water-repellent sealing foil, while the inside of the liner product was lined with a light-permeable composite foil that was peeled off after installation.

A custom-made packer was then connected to the Vertiliner before a mobile crane lifted the packer and the liner into the pumping station manhole ready to be cured.  

Cured DN2000 Vertiliner
Cured DN2000 Vertiliner. Image: Diringer & Scheidel Rohrsanierung.

After the Vertiliner was aligned inside the pumping station manhole, compressed air was applied before the structure was cured using advanced UV technology. 

The light unit had an incredible 3 x 3,000 watts power output and the curing was carried out at an impressive speed of around 15cm/min. 

Once the curing was complete, the ends of the hose liner were cut off evenly. Existing inlets and connections were restored and transition areas laminated. 

The end result proved it was the right solution to tackle a manhole of this scale. The project was also one of the biggest Vertliners ever to be installed in Germany. 

Impressive solutions like this are why Pipe Core is the exclusive distributor for Vertiliner in Australia and New Zealand, providing its customers with unique trenchless manhole rehabilitation systems. 

For more information visit pipecore.com.au/vertiliner/



Urban Utilities completes $45m upgrade

The upgrades included the laying of 8 km of new pipeline, as well as the construction of a 4 km recycled water pipeline.

The upgrade is the Queensland utility’s largest project in Somerset to date and includes the laying of 8 km of new pipes and the construction of two new wastewater pump stations. 

The new plant will be capable of treating 1.5 megaliths of wastewater every day from neighbouring Lowood and Fernvale. 

Urban Utilities resource recovery general manager Peter Donaghy said the upgrade would ensure the region is prepared for the forecast growth in the coming years. 

“As more people choose to call beautiful Somerset home, it’s important we lay down the foundations for the future,” said Donaghy. 

“The treatment plant has doubled the capacity of the local wastewater network, ensuring the region has the infrastructure it needs for many years to come. Equipped with the latest membrane technology wastewater treatment, the plant will also deliver environmental benefits for local waterways.”

The Somerset regional council mayor Graeme Lehmann also welcomed the completion of the Somerset upgrades. 

“Somerset is one of the fastest growing regional council areas in Queensland and this significant investment by Urban Utilities will make sure we’re well prepared for growth,” said Lehmann. 

As an additional benefit, the new wastewater treatment plant will also provide high quality recycled water as a source of sustainable irrigation for Fernvale Sports Park. 

“Council has constructed a 4 km pipeline to transport the recycled water to the park and we want to sincerely thank them for this significant contribution,” Donaghy said.

The Drought Solutions Pipeline was funded under the Queensland Government’s Unite and Recover Community Stimulus Program Part 1. 

View the latest trenchless technology tenders

View the latest trenchless technology tenders

Domestic wastewater pipeline renewals 2021/22 
Issued by: Gisborne District Council
Closing Date: 10 December 2021
Location: New Zealand
Description: The request for proposal is an invitation to suitably qualified suppliers to submit a proposal for the renewal of existing domestic wastewater pipeline (trenchless).

Horizontal directional drilling to provide services to Horsham Nature Play Park
Issued by: Horsham Rural City Council
Closing Date: 10 December 2021
Location: Victoria
Description: Horsham Rural City Council invites you to provide a quotation for the installation of horizontal directional bore for the water, electrical and waste services for the Horsham Nature Play Park.

Sewer and stormwater mains lining
Issued by: Hunter Water Corporation
Closing Date: 16 December 2021
Location: New South Wales
Description: The work under this contract includes, but is not limited to, the rehabilitation of gravity sewer and stormwater mains by the installation of lining systems to restore structural integrity, prevent infiltration and exfiltration, eliminate root ingress and/or restore the hydraulic capacity of the mains.

The gravity sewer mains to be rehabilitated will be from a nominal diameter of 150 mm up to a maximum of 600 mm. The stormwater mains to be rehabilitated will be from a nominal diameter of 750 mm up to a maximum of 1050 mm.

Big Rivers Region, Central Arnhem Road, provision of water bore drilling services
Issued by: Department of Infrastructure, Planning and Logistics
Closing Date: 15 December 2021
Location: Northern Territory
Description: A general outline of the work to be carried out under the contract comprises of drilling and casing of two new road construction water bores on Central Arnhem Road for prioritised upgrade works at Mountain Valley and Mainoru.

Pipeline duplication contract administration, inspection and verification services
Issued by: Townsville City Council
Closing Date: 15 December 2021
Location: Queensland
Description: RRD2DWTP Pipeline Duplication Contract Administration, Inspection and Verification Services

Country South Water Retic Renewal Program
Issued by: Water Corporation
Closing Date: 15 December 2021
Location: Western Australia
Description: Water Corporation is inviting organisations with suitable experience, capability and capacity to submit a Bid for our Country South Water Reticulation Renewals Package for sites in Narrogin and Wagin, Western Australia. The scope of work requires the supply and installation of DN100/DN150 Series 2 PN16 PVC-M water reticulation main and associated works.

Panel of providers for stormwater CCTV
Issued by: Hobart City Council
Closing Date: 08 December 2021
Location: Tasmania
Description: Panel of providers for closed circuit television (CCTV) inspection and cleaning of stormwater infrastructure.

Each fortnight, 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 three months free on their subscription plans.  

Email support@australiantenders.com.au for more information.  

For more tender information visit the Australian Tenders website

JAYDO excavator

Trenchless works on Painted Hill sewer upgrade

Yarra Valley Water has appointed JAYDO Construction as its project partners, beginning work onsite on the sewer upgrade in July 2021. 

JAYDO Construction has mobilised and commenced works at the Painted Hills Sewage Pump Station and Rising Main Project for Yarra Valley Water. 

This project involves constructing a new underground pump station near the intersection of Painted Hills Road and Kyarra Drive, Doreen. 

Painted Hill sewer upgrade map

It requires 1 km of 500 OD HDPE pipeline from the pump station to the Overland Drive roundabout, under Laurimar Creek to Bradford Drive, where it will connect to the existing sewer network. 

Once these works have been completed, then the existing sewer pump station and pipeline will be decommissioned. 

In the top image, 49 t excavator breaking rock in the 13 m deep wet well shaft next to the Laurimar Creek wetlands.

The sewer upgrade is expected to take 12 months to complete, with estimated completion in July 2022. 

JAYDO Construction was previously contracted by Yarra Valley Water along to perform trenchless and micro-tunnel boring works on the Lockerbie Main Sewer Project. 

For more information visit the Yarra Valley Water website.