The project’s objective was to deliver a new wastewater scheme to service the Redhills Special Housing Area (SHA) and included a branch sewer, 141 L/s pump station with underground storage tanks, 900 m long 355 OD HDPE rising main, 3,200 m of gravity sewer and a connection to the existing Massey North pump station on Northside Drive.
Pipeline and Civil offer specialist engineering services across a wide range of sectors, with an expertise in water infrastructure, civil engineering and large diameter pipelines.
The Hobsons Bay Main Sewer, originally built in the 1960s, is responsible for carrying more than 30 per cent of the city’s wastewater to the Western Treatment Plant.
Melbourne Water will undertake the essential upgrade to boost the sewer’s capacity and ensure the reliability of the city’s sewerage service for the next century.
Melbourne Water General Manager Major Project Delivery Eamonn Kelly said the 2.1 m diameter reinforced pipe that can handle flows of up to 7,700 L/second would be upgraded, while a new sewer main will ensure wastewater flows are diverted during the works.
“The duplicate sewer main will allow for this upgrade to be completed safely and efficiently,” said Mr Kelly.
“It will ensure the continued smooth operation of the sewer network which caters for Melbourne’s growing CBD and bayside suburbs.”
The project will see two shafts up to 30 m deep constructed on either side of the Yarra River and a TBM used to construct the new main.
“The project team is currently working on the design, taking into account the challenging ground conditions on either side of the Yarra River and the existing active sewerage system,” said Mr Kelly.
Melbourne Water has released an expression of interest for the project, from which a limited number of contractors will be invited to tender.
The company has completed countless underground infrastructure projects throughout New Zealand, often using its own custom-made trenchless tools to ensure elite performance.
Pipeline and Civil attributes its success to both its outstanding project expertise as well as its strong company culture of collaboration and inclusiveness. The company places a significant emphasis on the values of safety, quality, honesty, care and success when delivering each project and takes great pride in delivering results for clients on time, on budget and with a low impact on the surrounding community.
Pipeline and Civils’ custom built telescopic conveyor can be used for backfilling trenches from the end where access is not possible to backfill from the side of the trench. This is particularly relevant in constrained urban areas where local authorities demand that traffic lanes remain open, reducing lateral safety zones and preventing equipment from accessing the side of the trench.
Although it can now claim expertise in many areas, Pipeline and Civil was originally founded on its ability to deliver high quality water infrastructure. The company has constructed some of New Zealand’s largest water mains and has the capability to undertake many different construction and rehabilitation works, including installing high-density polyethylene rising mains, pump stations and associated pipe works, water treatment plants and storage tanks.
Pipeline and Civil sees immense value in using trenchless technology due to its environmental, practical and cost benefits, with the company saying most of its projects now use at least one trenchless method.
Pipeline and Civil is an expert in slip lining, having installed pipe strings up to 400 m in length and 1,400 mm in diameter, while its horizontal directional drilling (HDD) knowledge is also top level and its in-house welding team ensures only the highest quality welds are performed on a project. Pipeline and Civil also boasts expertise in pipe bursting, pipe ramming, microtunnelling and structural lining – the result of many years of experience across its teams and its involvement in some of NZ’s largest and most complex trenchless projects.
Additionally, the company has strong relationships with subcontractors that are experts in these methodologies, ensuring clients have the sharpest minds in the business on hand for their works.
The image above shows work in progress on a 7 km of 710 OD PE pressure wastewater pipe in northwest Auckland.
Custom linear winch
In addition to its project expertise, the company’s leading technical and engineering knowledge has allowed it to develop its own custom-made tools to use onsite. Recently, a project with Hastings District Council and Stantec provided the opportunity to use a custom hydraulic winch, designed and built by Pipeline and Civil.
The hydraulic linear winch was developed for the specific purpose of pulling polyethylene (PE) pipe through a host pipe and can be adjusted to suit different sized pipes. Capable of pipe pulls up to 400 m in length and applying up to 45 t of force to overcome internal friction, the winch has now been successfully tried and tested across five projects by Pipeline and Civil.
The works included the installation of 1,460 m of DN355 PE pipe that was relined, using the hydraulic winch, through the existing 375 concrete pipe, which was very deteriorated in places and had recently required several repairs. To properly rehabilitate the asset, relining had been chosen as the optimal solution.
Relining an existing host pipe greatly extends the life span of the pipe and in this case also allows it to withstand more pressure and more flow. The Pipeline and Civil team also shut down three pump stations and installed three new valve connections and two 90° bends over the 1.5 km stretch.
The upgrade will allow the sewage system to operate with more efficiency at full capacity and the overall project was completed in just under 10 weeks.
This article was featured in the September 2020 edition of Trenchless Australasia. To view the magazine on your PC, Mac, tablet or mobile device, click here.
Urban Water Renewals 2020-2021 Package Three Issued by: Rotorua Lakes Council Closing date: 22 October 2020 Location: New Zealand Description: Tender has been released for civil construction, water and sewage services. Scope of works include installation of new mains and riders as well as the excavation of the trench, jointing and bedding pipework, installing all required bends, tees, end caps, anchor blocks, valves, hydrants and associated surface boxes and markings, backfilling and compaction of the trench. All pipe work shall have blue water main indicator tape installed 500 mm above the pipe.
Screening and screenings washing equipment for QSTP Upgrade Issued by: Queanbeyan-Palerang Regional Council Closing date: 22 October 2020 Location: New South Wales Description: Queanbeyan-Palerang Regional Council is seeking tenders from suitable companies for the design, manufacture and supply of the screening and screenings washing equipment for the Queanbeyan Sewage Treatment Plant (QSTP) inlet works. The scope includes providing installation and commissioning assistance.
UV Disinfection System – Port Douglas Waste Water Treatment Plant Issued by: Douglas Shire Council Closing date: 29 October 2020 Location: Queensland Description: Suitably qualified service providers are called for industrial filtering and purification and water and sewage pump station construction services.
Edward River Council Sewer Relining Program 2020/21 Issued by: Edward River Shire Council Closing date: 29 October 2020 Location: New South Wales Description: Edward River Council is seeking tenders from suitably qualified and experienced companies for Sewer Relining Works throughout the suburb of Deniliquin. Council maintains an extensive network of sewer reticulation mains within the area.
Supply and installation new pipeline, North Newman Reserve Issued by: East Pilbara Shire Council Closing date: 30 October 2020 Location: Western Australia Description: The principal requires supply and installation of approximately 384 m of pipework, to replace the portion of existing line, to continue supplying potable water to tenants located within Reserve 41654. This work requires the connection of the existing mains water meter on Kurra Street, to existing pipework running parallel with Les Tutt Drive in the North East area of Reserve 41654.
Construction of Anzac Street Bridge Water Main Replacement Issued by: Gippsland Water Closing date: 5 November 2020 Location: Victoria Description: The works include removal of existing water main and pipe supports including disposal, installation of new pipe supports and DN300 MSCL pipe over VicTrack rail line, tie in and commissioning of new main.
Tender for Kapuni Water Supply Trunk Main Duplication Issued by: South Taranaki District Council Closing date: 5 November 2020 Location: New Zealand Description: Tender is released to re-establish redundancy for approximately 1.9 km of the trunk mains from Kapuni water treatment plant. The project consists of installation only of approximately 1,882 m of STDC supplied DN 350 PE 100 PN 12.5 pipe from Kapuni water treatment plant, passing through Skeet Road, then through existing easement along the farmlands, then passing through Ahipaipa road until the designated tie-in point as specified in the construction plan. The contractor shall allow to pick up the STDC supplied pipes from the stockpile located at Waimate West and Kapuni water treatment plants. The contractor shall supply all fittings, air valves, scour valves, valves, hydrants, surface boxes, service laterals and connection to existing property kits etc. as detailed on the drawings and listed in the Schedule of Quantities.
Mackenzie Street, Blackwater Sewer Realignment Issued by: Central Highlands Regional Council Closing date: 7 November 2020 Location: Queensland Description: Central Highlands Regional Council (CHRC) requires a suitable contractor to realign sewer pipes and to demolish and backfill the existing dilapidated pump station. Approximately 82 m of new SewerMAX pipes are to be installed at an approximate depth of 3 m as well as three new manholes (one with a drop inlet to 5 m deep to connect to the existing sewer). The contractor will also be required to ensure the existing sewer system is operational at all times using a bypass system.
Gerogery Drainage Stage 1 Works Issued by: Greater Hume Shire Council Closing date: 10 November 2020 Location: New South Wales Description: Project scope forms part of the overall drainage design to cover the township of Gerogery.Stage 1 involves the construction of approximately 900 m of piped drainage as well as associated pits and open swale drains. The open swale drain construction will require the replacement of a number of existing driveway culverts to match the design grade. Pipe diameters range from 300-525 mm diameter. 150 mm house drains are to be provided to each property.
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 an extra three months on their subscription plans.
Watercare’s Northern Interceptor project, using a specialist HDD solution by HDI Lucas, demonstrates how advanced planning combined with trenchless technology can deliver results in highly populated areas, while minimising impacts to community and environment.
Auckland is New Zealand’s economic powerhouse, located in the North Island with a population of 1.7 million. The city is undergoing rapid growth and is seeing major infrastructure investment, including the Northern Interceptor wastewater project. With a new wastewater pipe designed to redirect flows from the northwest areas of the city to the Rosedale Wastewater Treatment Plant in Albany, the Northern Interceptor will be completed in stages as population increases. The first phase will involve combining construction work with a new watermain across the Upper Waitematã Harbour.
As a council-controlled organisation, Watercare provides water and wastewater services to the people of Auckland and Project Manager Dave Moore says forward thinking was vital in relation to planning major infrastructure such as Northern Interceptor.
“Forecasting shows that Auckland’s population is set to increase by 700,000 people in the next 30 years, and our networks need to be prepared well in advance to continue to provide reliable, safe and efficient services,” he says.
“Commencing major projects like Northern Interceptor in advance of demand ensures we are able to plan and manage the project effectively, consulting with local iwi and our wider communities and prioritising sustainability. It also really exemplifies that we are living Watercare’s vision: “Better tomorrow than we are today – Pai ake apõpõ atu i tenei rã.”
Workers onsite overseeing the pipe pulling operations.
Clear objectives, but many considerations
While project objectives were clear, the best way to achieve them was less obvious. Project location presented limited existing infrastructure options and major obstacles, with waterside position meaning access to North Auckland was only available via two options: a marine trench or a trenchless solution across the Upper Waitematã Harbour.
Along with all areas in the vicinity of the pipeline being either densely populated urban environments or pristine waterways, identification of a suitable pipeline path and construction methods were key to optimising outcomes. Principal contractor Fletcher Construction recognised the benefits of incorporating horizontal directional drilling (HDD) into the project at the design stage, engaging HDI Lucas to provide specialised trenchless engineering and construction.
HDI Lucas General Manager John Stuart-Robertson says the challenge was to design the large-scale pipeline and associated installation methods, balancing functional requirements with environmental and stakeholder impacts, engineering constraints and cost.
“We knew what infrastructure was required to be connected by the pipeline, but there were a range of options for what path the pipeline would take, and how it would be installed, as well as significant obstacles – the most obvious being the Upper Waitematã Harbour,” he says.
After exploring several options, a final pipeline design was decided upon, incorporating 500 mm HDPE PN 16 sewage rising mains under the Upper Waitematã Harbour and Te Wharau Creek.
HDD solution in complex circumstances Mr Stuart-Robertson says the incorporation of HDD opened major efficiencies and benefits for the pipeline.
“Fletcher Construction had options to construct the pipeline without using HDD, but marine trenching was not the preferred option in the Watercare tender, as it meant potentially a much longer path around the harbour and a lot more impact on the community and environment via trenching along roads and other properties,” he says.
“By using HDD, the pipeline was able to take a much more direct and optimal path, passing directly underneath the harbour and coastal creek, avoiding excessive disruption of highly populated areas and a key transport waterway.”
Mr Stuart-Robertson says the project presented several engineering difficulties that were overcome by effective planning and preparation.
“We completed the maxi rig HDD crossings in challenging rock and clay conditions, and detailed planning and preparation was required to ensure the crossings were constructible and risk was as low as possible,” he says.
“We engineered the crossings to be completed at maximum depth and drillable angles to prevent hydrofracture, without any risky compound curves. Additionally, our bottom hole assemblies were manufactured with variable jet configurations to overcome the East Coast Bays Waitematã rock and sticky clay.
“We also needed to complete detailed planning and negotiation to secure a suitable stringing area, as the urban location of the pipeline meant that options large enough to be safe and suitable were severely limited.”
Wide project benefits, both short and long term
HDI Lucas’ HDD rig at the Northern Interceptor project.
Mr Stuart-Robertson added that advanced planning and use of HDD for the project also allowed for effective prioritisation of the culturally significant waterways and wider environments.
“As well as being ecologically and environmentally significant, detailed archaeological assessment carried out for the project showed that the banks of Te Wharau Creek were a significant ancient Mãori burial ground,” he says.
“By using trenchless methods, those culturally important areas remained untouched and unaffected by the project. This is just one example of how use of HDD, along with effective planning, allowed the project to be completed with great regard and respect for the environment and local communities and stakeholders, maximising project support and positive outcomes.”
Fletcher Construction Project Manager Mike Wall says the project brought benefits to the community on both an initial and ongoing basis.
“Local crews were employed in every aspect of construction, bringing new jobs to New Zealanders,” he says.
“But the real benefits of Northern Interceptor will be felt in the future. Communities in north Auckland will benefit directly from additional wastewater capacity of the Rosedale plant, and the strain will also be taken off the Mãngere plant, optimising its lifespan and minimising the need for works in surrounding areas.”
With the overall stage one of the project nearing completion, additional stages will be completed based on population growth.
This article was featured in the September 2020 edition of Trenchless Australasia. To view the magazine on your PC, Mac, tablet or mobile device, click here.
The contractor was commissioned to deliver a new DN180 mm HDPE PN16 brine pipeline from the existing connection at the desalination plant to an outfall at Point Clune.
All potable water on the island is produced by desalination, with the reject water from the desalination trains discharged via the existing 90 mm PE pipeline.
In a social media post, DM Civil shared images from the project and said the new pipeline is being constructed using trenchless technology.
“The new DN180 HDPE pipeline is being constructed using directional drilling methodology as the majority of the pipeline will be below ground through the coastal limestone,” the company said.
“Approximately 550 m of pipeline is being constructed to assist with increasing the freshwater capacity on the island.”
The 9 km Mardi to Warnervale Pipeline is being delivered by joint venture partners Spiecapag and Seymour Whyte and, once completed, will enhance water supply network for the entire region, in particular expanding the northern growth corridor.
HDI Lucas, a subsidiary of Spiecapag, completed the Wyong River and Porters Creek crossing in August.
Central Coast Council is investing more than $61 million in the pipeline, which is being constructed with the use of trenchless technologies due to the sensitive environmental areas in the region.
The pipeline is expected to be commissioned in 2021.
Based in New South Wales with services across the country, Mainstream Industries’ trenchless capabilities include high pressure water blasting underground utility locations; drain and pipeline cleaning; CCTV pipeline inspections hydro excavation and pipeline pigging.
Mainstream Industries says it has become an industry leader by providing a world class interactive, integrated management system, the latest technology in equipment and training its personnel to the highest possible standard.
“Our wide range of services offer a comprehensive, cost-effective solution for your locating, hydro excavation, pipeline cleaning, CCTV inspection and waste removal needs.”
Locating underground services
Mainstream uses the latest technology and precision electromagnetic and RF Marker location. This technology, combined with highly trained and experienced operators provides a safe working environment for all personnel involved in ground excavation. Mainstream says locating underground cables, gas pipes, copper pipes, communication and electrical cables prior to excavation provides its clients with peace of mind.
Mainstream adds the locating of underground utilities goes hand in hand with its industrial vacuum loading combination units.
A non-destructive, non-invasive solution
Mainstream Industries offers the non-destructive, non-invasive process of hydro excavation, which uses pressurised water and vacuum to excavate soil. Unlike conventional excavation methods, hydro excavation mitigates damage to underground services such as fibreoptic, stormwater lines, electricity cables and sewer lines.
Mainstream’s large fleet of industrial vacuum loading and combination units ensure client timelines are maintained through efficient delivery of services.
Compared to traditional methods, hydro excavation is a safer, more cost-effective solution.
High-pressure water blasting
In addition to its hydro and vacuum excavation capabilities, Mainstream Industries is also a specialist in high and ultra-high-pressure water jetting.
For high-pressure water jetting needs, the company has fully self-contained mobile units available in 4WD, capable of carrying up to 4,800 L of water and can be accompanied with registered standpipes issued by Hunter Water.
Mainstream’s experience in high-pressure water jetting allows for the safe and effective cleaning of infrastructure, plant and equipment. Mainstream offer high-pressure water jetting from 4,000 PSI up to an impressive 36,250 PSI.
Drain cleaning and CCTV inspection
The business model designed by Mainstream Industries allows for an entire service from start to finish, including utility locating, hydro excavation, drain cleaning and CCTV inspection. The use of the combination vacuum unit allows for a thorough clean, removing blockages and debris, with all waste removed from site and transported to an approved waste facility. Mainstream’s EPA transporter of waste licence ensures the tracking of waste is managed in accordance with EPA requirements.
Ensuring pipeline structures are sound is completed using the latest technology in CCTV inspection equipment. Mainstream’s use of the Kummert Profi 3 with the F-200 Crawler utilises WinCan software for digital video recording and enhanced still imaging to complete CCTV inspections and generate reports that provide a clear representation of a pipeline’s condition.
“Clients are given peace of mind with our 24-hour, seven days a week emergency service,” says Mainstream Industries.
A team you can trust
Mainstream Industries prides itself on its commitment to fulfil each project safely and successfully by implementing several lines of communication to ensure it delivers what it promised, on time and every time.
Mainstream’s award-winning management systems and training programs have seen the company expand its fleet and diversify across all areas of industrial cleaning services, resulting in numerous contract awards across the mining, power, civil and supportive industries.
“Providing our operators with an interactive integrated management system has given them ownership and the inclusiveness of being part of the team,” the company says. Mainstream adds its clients have also seen the benefits with access to the system and a comprehensive overview of day to day workings providing real time monitoring capabilities.
Mainstream Industries is evidently committed to providing excellence throughout all areas of the business. The commitment to continuous improvement, development and embracing technology is paramount to the company’s success.
This article was featured in the September 2020 edition of Trenchless Australasia. To view the magazine on your PC, Mac, tablet or mobile device, click here.
AUSJET/ADCVA initiated a review of the training packages through IBSA, which is now in the second round of the public consultation phase.
Through the process, AUSJECT/ADCVA has lobbied to have a new unit of competency (UOC) added to cover hydro excavation after some operators were unable to comply with the training requirements for Class B high pressure pumps used on some units due to the limited existing UOC’s.
IBSA is now seeking feedback on the draft UOC’s and skill sets for the MSM Manufacturing Training Package; IBSA asks that the Consultation Paper is referred to prior to providing feedback.
The second public consultation round is now open and will conclude on 21 August 2020, with feedback to be emailed to manufacturing@ibsa.org.au before this deadline.
IBSA will also be holding a consultation session via zoom on Thursday 20 August 2020.
To participate in the session, register here by COB Monday 17 August.
Lytton Road Wastewater Pipeline Renewals Issued by: Gisborne District Council Closing date: 17 August 2020 Location: New Zealand Description: The council is seeking experienced and skilled contractors to design liners fit for purpose to extend the useful life of these assets with at least a further 50 years and successfully install the liners before 16 November 2020.
Halifax Business Park Sewer Upgrade Issued by: City of Bunbury Closing date: 26 August 2020 Location: Western Australia Description: The City of Bunbury is currently seeking to engage a suitably qualified and experienced contractor to undertake the construction of sewer infill within the Halifax Business Park in Davenport, Western Australia for the principal as required.
Stormwater Drainage Relining Works Issued by: North Sydney City Council Closing date: 27 August 2020 Location: New South Wales Description: Tenders are invited from suitably qualified contractors for the structural relining of council stormwater drainage pipe sections within the North Sydney Council area. Works are to include the internal lining of stormwater drainage pipes, patch lining of drainage pipes and associated works.
Motueka Water Treatment Plant Issued by: Tasman District Council Closing date: 27 August 2020 Location: Victoria Description: The Principal Tasman District Council is inviting tenders for Contract 1058 Motueka Water Treatment Plant. The scope of the work is fully described in the tender document, and involves the design and construction of the new water treatment plant including but not limited to; new bore pumps and headworks; construction of stormwater management measures; and connection to the stormwater existing network.
Rehabilitation of Gravity Sewerage Reticulation Mains Issued by: Tweed Shire Council Closing date: 9 September 2020 Location: New South Wales Description: This tender has been called to engage a suitably qualified and experienced organisation to provide structural rehabilitation for 9.4 km of 150 and 225 mm gravity sewer mains within the Tweed Shire using non-evasive technology. The intent of the rehabilitation is to increase the useful life of the asset and increase its level of service. Council is after a quality product and installation to ensure the longest possible future life for the asset.
WBBROC Sewer Relining Program Issued by: Fraser Coast Regional Council Closing date: 20 September 2020 Location: Victoria Description: Fraser Coast Regional Council, on behalf of the Wide Bay Burnett Regional Organisation of Councils (WBBROC), is inviting tenders from suitably qualified and experienced contractors to provide sewer rehabilitation services. The work includes all activities and materials to rehabilitate existing sewer mains from DN150 to DN900 including: CCTV survey, sewer cleaning, sewer relining and refurbishment of property connections.
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.
Trenchless Australasia sat down with Watercare’s John McCann to ask what sparked the company’s interest in non-conventional construction methods, the Watercare’s core values when it comes to infrastructure decisions and the changes in NZ’s water sector as a whole.
Mr McCann is a Projects Manager in Watercare’s construction delivery team where he heads up a team of project managers focused on the successful delivery of water, wastewater and treatment projects across the Auckland region.
The delivery of these projects is often achieved with trenchless technologies, which Watercare has been implementing in its construction works for more than 20 years, often using horizontal directional drilling (HDD) and microtunnelling due to their versatile and cost-effective nature compared to traditional trenching methods.
“The unique Direct Pipe® tunnel boring technology has created more possibilities for installing pipelines at various depths and in different geology,” says Mr McCann.
“We used this methodology for the first time in NZ and Australasia 18 months ago. We are currently close to completing our second wastewater ocean outfall pipe installation using this technology.”
The Direct Pipe® trenchless technique was used on the Army Bay Ocean outfall project by Watercare.
Growing benefits
Mr McCann says Watercare first began using trenchless technologies due to the community benefits they could provide.
“It means we can build below Auckland’s busiest commercial areas, railways, motorways and major regional arterial routes carrying thousands of commuters every day with minimum disruption,” he says.
Watercare has recognised there are even more benefits that come from trenchless technology, such as minimal environmental impact and carbon emission reductions.
“Pipe jacking and microtunnelling are some of the safest and most environmentally friendly underground construction processes,” says Mr McCann.
“Last year we announced our 40:20:20 vision for our infrastructure delivery program. The aim is to reduce carbon in construction by 40 per cent, injuries in construction by 20 per cent year on year, and infrastructure program costs by 20 per cent by 2024. These methods will help us to meet these goals.”
Watercare’s organisational vision is to be ‘trusted by its communities for exceptional performance every day’.
“When it comes to building or upgrading infrastructure, we have to do this in a reliable and cost-effective way so that we can accommodate growth while maintaining service standards and keeping our charges to a minimum,” he says.
“Many factors are considered in the decision-making process including the buildability, potential disruption, public safety and cost.”
A global task
Watercare often uses local contractors and technology from NZ and Australia and also uses innovative technologies from around the world.
“The Central Interceptor wastewater tunnel project is a good example where international experience and technology is being leveraged to help service new growth while also cleaning up the environment,” says Mr McCann.
The Central Interceptor is being constructed by the Ghella Abergeldie Joint Venture (GA), founded in Italy and Australia respectively. Watercare says GA has more than 150 years’ experience with tunnelling and wastewater projects of this size across the globe, making it the suitable contractor to create the super-sized wastewater tunnel that will reduce overflows.
Change for the future
With its reputation of consistent innovation, Watercare recently developed an enterprise model to build and deliver water and wastewater infrastructure more effectively.
Building on its 40:20:20 goal by 2024, the company is working collaboratively with selected contractors to plan and deliver a program of work rather than discrete projects, which will help drive investment and innovation in the industry while also improving cost efficiency.
Mr McCann says the future of NZ’s water sector may see many changes, as 2020 saw Auckland hit by the worst drought on record off the back of a further drought in 2019. Additionally, climate change is likely to deliver more extreme dry periods punctuated by more intensive rainfall events.
“The next decade will continue to see significant investment in the water and wastewater sector with opportunities for innovation that allow cost-effective infrastructure to continue being built while minimising disruption and effects on communities,” he says.
This article was featured in the September 2020 edition of Trenchless Australasia. To view the magazine on your PC, Mac, tablet or mobile device, click here.
With 40 years of experience in the industry, the company has established itself as one of Western Australia’s most knowledgeable underground infrastructure companies.
GM Microtunnelling is part of WA’s history in the trenchless industry, with General Manager Gary Miller’s father Jim responsible for purchasing the first horizontal boring machine in the state. Gary and Jim recognised the increasing demand for this brand of underground construction and quickly established a name for themselves by winning contracts for various vital water and gas works.
The company adapted and progressed as the technology continued to improve through the decades and, although Jim eventually retired, GM continues as a family business today with Gary’s son and grandson both a part of the team.
Comprehensive knowledge
As both a primary or subcontractor, GM has installed pipelines beneath buildings, highways, railroads, runaways, rivers and environmentally sensitive areas. The company is capable of tunnelling through hard rock up to 660 m OD as well as cobbles, boulders, gravel, clay, sand and silts up to 800 mm OD, with its trenchless methods particularly suited to gravity sewer, water and drainage pipelines.
GM often works together with project engineers to provide planning and technical advice on a project and is able to set itself ahead of the pack thanks to its extensive knowledge of ground conditions throughout WA. Along with its local knowledge, the company has expert proficiency in the operation of a large variety of tunnelling machines including the Grundomat range and Essig air tools, along with auger, ramming, pipe bursting, pilot and slurry microtunnel boring machines (MTBMs).
With four complete systems in its fleet, GM can currently tunnel from 150 to 800 mm pipe to line and grade using polyvinyl chloride, concrete, vitrified clay, glass reinforced plastic and steel pipes. The company has its fingerprints over a large range of significant infrastructure projects in WA and is continuing to stay busy while the trenchless method of construction gains a greater standing as the approach of choice for many asset owners.
Some of GM’s works include the completed installation of a gravity sewer in Wungong Reach with a DN 650 Hobas pipe after a 1,200 m bore at a depth of 6.5 m. At Heron Park in Harrisdale, GM completed a 450 m bore at a depth of 9 m for a gravity sewer using DN 600 steel casing, while the company was able to bore 300 m at a depth of 5.5 m for a gravity sewer in Parkland Heights, Baldivis.
GM is a fully accredited contractor operating in line with integrated management system standards ISO9001 2015, ISO14001:2015, ISO45001:2018 and is an approved Tier 3 Water Corporation supplier.
Though it has already acquired a vast wealth of industry knowledge and experience, the company intends to lead the trenchless technology industry through its consistent embrace of new methods and innovative ideas. GM is regularly participating in and encouraging the training of new personnel in the industry and places the upmost importance on its quality of service.
This article was featured in the September 2020 edition of Trenchless Australasia. To view the magazine on your PC, Mac, tablet or mobile device, click here.
As trenchless technology continues to make its mark as the preferred installation method for underground infrastructure, Aussie Trenchless remains at the forefront of the industry with innovative new products and technology.
Growing in popularity
The company’s flagship product is a close fitting structural spiral ribbed PVC trenchless pipe lining system titled the SRP EXP. Used for circular sewer and storm gravity mains, the method continues to grow in popularity and will now be used on the recently-awarded FNQ project.
When the SRP EXP is installed, asset operators will extend the service life of a system by more than 50 years. Although designed to fit standard size access chambers, the product is also ideal for tight spaces or those with limited access.
Since the installation process is its unaffected by running infiltration and does not require bypass pumping, SRP EXP is well suited to water applications, particularly as it also enhances the hydraulic characteristics of the rehabilitated asset.
Aussie Trenchless Director Chris Meredith says he has seen significant growth in the implementation of this trenchless solution both around the world and here in Australia, where it continues to be implemented in relining projects, including in its repeat customer Relining Solutions’ upcoming contract.
Major improvements were already evident in the middle of the Ravenshoe Project.
Customers keep coming back
Relining Solutions is not the company’s only repeat customer, Mr Meredith says, with an international customer based in Taiwan ordering more supplies to be delivered in September this year.
“In 2019, the customer purchased 50,000 linear metres and have since been installing that,” says Mr Meredith.
“They have now placed another order of 60,000 linear metres, which are being manufactured as we speak.”
Mr Meredith says the customer is an active player in the Taiwan sewer industry has been for a substantial amount of time, often using Aussie Trenchless supplies for its projects.
Mr Meredith adds that this is an example of how customers are taking advantage of the product, with the company also receiving lots of market feedback indicating it is one of the most financially viable and efficient systems available.
“Like all efficient trenchless methods, the spiral lining system helps ensure the project’s aboveground footprint is minimised as much as possible, which includes the land and environment itself, as well as the day-to-day lives of the public in surrounding areas,” says Mr Meredith.
A successful range
While the SRP EXP is at the forefront of Aussie Trenchless’ market offerings, the company’s Hot Sleeve Jacket is also popular due to its prompt resin curing times.
The Hot Sleeve is a tight-fitting heating jacket that is secured over a patch inflatable packer to reduce ambient cure period without any life reduction, saving operators up to 60 per cent in crew times.
The Ravenshoe Project beginning to improve after showing severe signs of deterioration.
Aussie Trenchless also offers the market a man entry lining system using transparent polypropylene lining panels for the rehabilitation of gravity sewer mains, namely its Pipe Segment Technology (PST). PST is easy and fast to implement with lining panels made of polypropylene material providing a smooth surface and excellent hydraulic performance characteristics.
This article was featured in the September 2020 edition of Trenchless Australasia. To view the magazine on your PC, Mac, tablet or mobile device, click here.
During COVID-19, some infrastructure projects – like the critical wastewater project at Moa Point in Wellington – were deemed so critical to the health and wellbeing of the local community that they could not wait. To complete the difficult project during the pandemic and against all odds, Interflow had to challenge the status quo and push the limits of traditional water infrastructure methods.
NZ’s largest water infrastructure project
Beneath the coastal streets of Moa Point lies one of Wellington’s most critical sewer pipelines that manages wastewater for more than 200,000 residents. Recently, the pipeline was experiencing severe corrosion and was at risk of collapse, with the deterioration having reached the steel reinforcement of the pipeline – even penetrating the pipeline in places – posing a threat to the network, community and environment.
As an operator, Wellington Water understood the health and longevity of the sewer was a top priority and it publicly tendered the rehabilitation works. The tender sought an innovative yet cost-effective solution that would prioritise the needs of the community and minimise disruption to residents.
Being renowned in the industry for its appetite for innovation and commitment to solving its customers’ problems, Interflow was awarded the project. As the Moa Point wastewater rehabilitation would become the largest dimeter sewer pipeline renewal project to take place on New Zealand’s shores, Interflow says it tackled the challenge head on.
Due to COVID-19 restrictions, all site personnel were required to wear PPE equipment such as face masks.
COVID-19 challenges local project
Although the contract was awarded in late February, the 260 m reline of Wellington’s main sewer could not commence until April, causing crews to quickly learn the importance of adaptability and agility with the coronavirus emergency in NZ.
While the country’s lockdown regulations have been some of the strictest in the world, Interflow was classified as an essential service meaning the wastewater network’s critical repairs could continue, albeit with a few workflow adjustments.
Interflow Project Engineer Saadia Ali says there were many challenges the crew overcame to ensure the project was kept on schedule.
“The expectation that our colleagues from Australia would fly out and provide support was no longer a reality and required us to employ some unconventional approaches,” she says.
Despite expecting assistance from Australian counterparts and training from experienced Rotaloc staff, once travel restrictions were put in place by both the Australian and NZ governments, Interflow’s crews were required to turn to virtual channels to bridge the training gap.
Tenacity and determination yields results
Ms Ali says using digital technologies enabled the crew to develop the necessary skills needed to deliver these works.
“The solution was a remote Rotaloc training session held via video link to bring our team up to speed on the patented technology’s application and operations,” says Ms Ali.
The Rotaloc installation of a new liner into the pipe provides a durable, long-term solution to protect Wellington’s wastewater interceptor from corrosion and support the needs of the community for at least another 50 years.
“Our team worked extremely hard to overcome the challenges faced due to the pandemic,” says Ms Ali.
“We were working away from our families in an ‘Interflow bubble’ and had to rethink the way we collaborated with our customers, contractors and the broader community.”
Commitment to the community
Through collaboration and forward thinking, Wellington Water and Interflow rebuilt the city’s critical wastewater link before any significant harmful effects impacted the city. With works now completed, Wellington’s residents can relax knowing the wastewater network and services to homes, local businesses and the community are back to being fully operational.
Interflow says its flexibility during the pandemic allowed the company to tackle the challenges of COVID-19 head on and deliver the project successfully.
“The virtual training and collaboration that took place during this project demonstrate the company’s innovative approach to problem solving,” says Interflow.
“Furthermore, the solution is now incorporated into the NZ team’s service offering moving forward, enhancing their ability to respond to challenges of this type in the future.”
This article was featured in the September 2020 edition of Trenchless Australasia. To view the magazine on your PC, Mac, tablet or mobile device, click here.
Due to COVID-19 social distancing requirements, the ASTT has begun holding webinars in place of its in-person trenchless forums with the series commencing on 23 July 2020.
Yesterday, Interflow Emerging Markets Manager Will Zillmann delivered a presentation on prominent water main renewable challenges faced throughout the industry.
Recently, Mr Zillmann said, the maximum time period a main can be left out of service is becoming shorter as technological capabilities increase, with planned interruptions setting the benchmark.
However, the significant challenge remains of questioning whether to remove, abandon or reuse the pipes due to the difficult areas they are situated.
“The largest cohort of failing assets are in urban locations typified by congested service corridors, paved roads and footpaths and high number of affected customers,” he said.
Along with these failing assets, Mr Zillmann said there has been a “historical underestimate in asset renewals which has led to budget shortfalls,” and the focus for budget-spend is predominately on visible projects such as road restorations.
“Pipelines are still seen as the poor cousin,” said Mr Zillmann.
“However, individuals in urban utilities expect an exponential increase in breaks over the next five years,” correlating with an increase in renewals.
Due to this increase, the Water Services Association of Australia (WSAA) has commissioned the CRC-P project for smart linings and coatings where trials and testing is being undertaken to create standards and codes of practice that increase confidence in the adoption of trenchless technology.
“WSAA said this is not so much of a solution, but a journey to a range of solutions.”
Included in this range of solutions is Interflow’s new product RediFlow™, a technology bundle of the company’s pre-existing Titeflow® H112 and Infrastop®.
The ‘Redi’ title, Mr Zillman explained, stands for reliable, environmentally friendly, durable and innovative.
Interflow aims to give its clients long-term performance with this single, integrated product while simultaneously reducing a project’s carbon footprint.
The next ASTT webinar will take place on 20 August.
The St Marys Bay Area Water Quality Improvement Project includes constructing a new stormwater storage pipeline that will reduce wastewater overflows to St Marys Bay and Masefield Beach by 95 per cent.
McConnell Dowell’s TBM Hinehōaka – named after the Māori deity of sandstone – is now positioned on a steel cradle to begin tunnelling this month after preparation activities were finalised.
Once tunnelling is complete, the TBM will have created a new 2 km long, 1.8 m diameter pipeline for the project, completed in three drives, to meet the increasing sewer system demand as Auckland’s population grows.
The pipeline will also significantly reduce combined wastewater and stormwater discharges to improve water quality and make local beaches safer for people and wildlife.
The project’s scope of works includes constructing three shafts; creating a tunnel to connect the shafts and a tunnel to the outfall location; assembling a 468 m long high-density polyethylene (HDPE) marine outfall; building a new pumping and screening station; and constructing a new weir structure and odour control unit.
The project commenced in January 2020 and construction is scheduled to be complete by mid-2021.
In a social media post, HDI Lucas shared the video and said it contained great shots of its Herrenknecht AG modular drill rig, National Oilwell Varco separation system and Gardner Denver PZ8 pump on site.
Central Coast Council is investing more than $61 million in the pipeline and is being constructed with the use of trenchless technologies, due to the sensitive environmental areas in the region.
The pipeline is expected to be commissioned in 2021.
The existing HDPE potable water pipeline, which runs along and under one of the main roads into the port, required rehabilitation.
Due to its location, a dig-and-replace option was not viable as the port facility operates 24/7 and a part of the pipeline passes through areas of cultural heritage sensitivity where digging is not permitted.
For the rehabilitation, 1,500 m of Primus Liner DN 150 was installed with the lining in three sections, taking less than four days to complete.
The Primus Liner was installed in only four days.
Consisting of a flexible Kevlar® reinforced liner and specifically developed end fittings, Primus Liner is a flexible sliplining solution for the trenchless rehabilitation of pressure pipes.
Cape Lambert is a seaport exporting iron ore with an annual capacity to handle 80 million t.
Hosted by Girls in Engineering, an outreach program at the University of Western Australia (UWA), the ‘Shaping the World’ online event will provide insight into an engineering career and encourage young females to consider the profession.
Participants will hear from a range of women working and studying across various engineering industries with the panel comprising UWA graduates and students discussing what engineering is and what engineers do, as well as misconceptions about the profession.
School students take part in the Girls in Engineering program’s events each year.
Panelist and mechatronic engineering graduate Hannah Golding is the founder of the Girls in Engineering program, a partnership between Rio Tinto and UWA to encourage women to study engineering.
She carried out research and development at UWA as a Rio Tinto graduate in the physics faculty, developing a survey instrument to find the next Tier 1 deposit and said her role was focused on discovering and influencing automation solutions for Rio Tinto.
“My team is thinking about how we do mining now, and how will this change in the future?” said Ms Golding.
“For example, would we use smaller electric vehicles, could we control diggers remotely, and can drones offer benefit in delivering essential items.”
Ms Golding said it was important to celebrate the successes and achievements of female engineers in the industry.
“Women in Engineering Day is about celebrating the progress we’ve made towards a diverse workforce and sharing the benefits of an engineering career to future students,” she said.
Since launching in 2014, Girls in Engineering has engaged with more than 8,000 students, 60 industry and 140 current university students.
Shaping the World will be held online on Tuesday 23 June at 5.30pm.
Known as the PolyForce 500, Worldpoly said the machine is ideal for use with PE and PP pipes and fittings of up to 500 mm IPS, with the manufacturer having closely considered the needs of operators and businesses in sectors like gas, water, construction and civil infrastructure.
Worldpoly Managing Director Rob Hall said the machines make use of the highest quality components and are engineered for reliability.
“We began with a blank canvas and asked ourselves, ‘what are the key ingredients to developing an industry-leading butt-welding machine’?” he said.
“If we were users of such equipment ourselves, what would we want and expect?
“That was our starting point. While some others set out to build equipment as cheaply as they can and then sell it for a premium, we wanted to design and manufacture the best machines available.
“These machines are now in the field and already proving themselves.”
The machine functions are controlled via an intuitive, rugged and easy-to-use touchscreen, while an onboard 20,000+ weld data logger allows easy access to important information and monitoring capabilities.
The Polyforce 500 has an easy-to-use touchscreen to control its functions. Image courtesy of Worldpoly.
Worldpoly said one of its technicians is available to travel to work sites anywhere in the world (COVID-19 permitting) to verse commissioning of the equipment and conduct customer training.
Designed and manufactured in Australia, Mr Hall said the PolyForce500 is available in tracked and non-tracked variants, with several new machines already out in the field.
“When you consider the design, engineering and construction qualities of the PolyForce500, coupled with its many features and the superior aftersales service that our company offers, it makes for an extremely compelling case to add these machines to the capital equipment list.”
The most recent quarterly update for the trenchless technology industry in Australasia is now available to view online.
This edition showcases how Trenchless Australasia is staying current alongside industry developments, with a modern look and a digitally interactive edition for the ease of readers.
The June edition includes:
An article on New South Wales’ extended construction hours and the benefits to the no-dig sector.
A positive news feature, highlighting local trenchless businesses and contractors who are staying busy during COVID-19.
An overview of the City of Logan’s longest horizontal directional drilling bore.
And much more!
We love to see people enjoying the magazine from the comfort of their own homes; please feel free to send through images of yourself reading the June edition, which we will feature online.
Click here to view the digital edition of magazine; if you share it online, don’t forget to tag our Twitter, Facebook or LinkedIn social media handles so we can like and share your post!
The reaction of bentonite when mixed with water is what makes it an effective component of a drilling fluid, earning it the title of “miracle mud” throughout the industry.
However, in an article published on LinkedIn, Mr Bilton said bentonites are classified into several types – such as calcium, sodium and potassium – although sodium bentonite it the most common choice in the drilling industry.
“While they are composed of the same fundamental building blocks, calcium bentonite does not exhibit the same desirable properties as its sodium cousin,” said Mr Bilton.
“These major differences in swelling, suspension and thixotropy can affect your drilling fluid (mud) and the ‘functions of the drilling fluid’ which in turn can have a significant impact on and the overall success and profitability of your project.
“Untreated calcium bentonite is not suitable for drilling fluid, so it is typically treated (beneficiated) during the milling process by adding sodium carbonate (soda ash), long-chain synthetic polymers, carboxymethylcellulose (CMC), starch or polyphosphates.”
Contrarily, Mr Bilton explains the structure and chemical composition of sodium bentonite means when the clay is mixed in water, the dry stacks of platelets begin to hydrate and swell as the water is attracted to both the negative clay surface and the positively charged ions in between the layers.
“As the individual platelets separate (disperse) in the water, their surface area and colloidal activity increases producing a viscous fluid that can suspend solids and seal up the bore/well bore,” said Mr Bilton.
“Sodium bentonite swells through a process of osmotic and crystalline swelling providing a 20-fold increase in volume. Calcium bentonite on the other hand undergoes crystalline swelling only resulting in a 2-fold increase in volume.
“Better swelling (hydration) means increased surface area and colloidal activity which translates into improve viscosity, better suspension capability, superior gel strengths, greater filtration control and higher yield.”
Mr Bilton said an intelligently designed and maintained drilling fluid is a critical component of a drilling operation and a good bentonite is often a critical component of that drilling fluid.
“When you consider all the functions of a drilling fluid, and how those functions impact the success or failure of the drilling operation, sodium bentonite outperforms all other products on the market.”
As a leading CCTV pipe inspection and pipeline rehabilitation company in Western Australia, Allpipe Technologies is no stranger to conducting underground asset audits by using the latest technology and methods to deliver tangible value for municipalities, authorities and private companies.
For such organisations, awareness and maintenance of underground assets has seen increased importance as it is not only vital to maintain an optimum level of service, but also to reduce the risk of disruption as much as possible.
With the support of SECA – a leading Australian supplier of equipment for the cleaning, inspection and rehabilitation of sewers and drains – Allpipe Technologies has been promoting and installing more than 1,000 QUICKLOCK systems throughout WA in the last year.
Allpipe Technologies utilises the latest technology and methods to deliver tangible value for its customers.
A cost-effective repair
Allpipe Technologies recently assisted with inspection services for the City of Subiaco, a suburb located in Perth. The suburb manages more than 100 km of pipeline, representing significant value for both the city and the thousands of residents and businesses within its boundaries.
On 10 March 2020, Allpipe Technologies deployed its CCTV inspection team to survey a storm water pipe located on a main road in one of the busiest intersections in Perth – which presented a void in the pipeline under the road reserve.
Allpipe Technologies Business Development Manager Morgan Caffrey says the inspection showed a visible void that, if left unnoticed, would cause the potential for a sink hole and environmental impact or disaster would be imminent.
“Subiaco City Council engineers investigated various rehabilitation technologies presented by Allpipe Technologies and decided that the QUICKLOCK was the most suitable to repair the defect in the most cost-effective way,” says Mr Caffrey.
“The QUICKLOCK is fast to install and has Australian approvals including a life expectancy in excess of 50 years.”
The following morning, Allpipe Technologies had already installed the DN300 QUICKLOCK with minimal disruption and traffic flowing as normal.
By using QUICKLOCK, Allpipe Technologies was able to avoid an environmental disaster in Western Australia.
A dedicated pipeline rehabilitation team
The Allpipe Technologies team is trained by SECA to install the QUICKLOCK, ensuring a quality service and product every time.
Dedicated to safety and employee development, all crews have experience working at heights, confined space entry, gas test atmospheres, first aid and traffic management to ensure project delivery that clients can always trust.
This article was featured in the June 2020 edition of Trenchless Australasia. To view the magazine on your PC, Mac, tablet or mobile device, click here.
Adept Civil has continually proved itself as one of the most knowledgeable and reliable contractors on Australia’s east coast. Fully accredited and massively experienced in the delivery of major projects, the company specialises in the supply and installation of water and sewerage drainage pipelines, pump stations and associated services.
In October 2019, Adept Civil was engaged by Longford Civil to carry out the boring works for the construction of a 4 km gravity sewer main to service the NEXUS Industrial Precinct in NSW. Located 10 km north of Albury, the site is zoned to support large or heavy industrial development and spans the Hume Freeway and the main Melbourne-Sydney rail corridor.
The hub is an extremely busy area, with a common user rail hub operating on site and businesses functioning at the location 24 hours a day, seven days a week. Longford was originally awarded the contract for works from the City of Albury.
The scope of the project included a trenchless pipe installation of 1.6 km of glass-fibre reinforced plastic (GRP) jacking pipe at a depth of up to 9 m and the construction of 38 sewer manholes, as well as the installation of 375 mm diameter ductile iron (DICL) DICL pipe for the open trench sections.
For the boring operations, Adept Civil chose to use a Vermeer axis guided laser boring system, chosen because of its laser feature that determines the line and grade of the bore, resulting in grade accuracy throughout the duration of the bore.
The closed-circuit camera built into the drill head allows the operator to constantly monitor line and grade, while the vacuum excavation method removes spoils efficiently without the need for manual labour. Additionally, the system’s modular design can be configured and modified in several ways to match any constraints imposed by the job site.
By employing a trenchless construction method for part of the project, operators have been able to protect the surrounding environment and cause less disruptions to businesses in the area. In particular, the trenchless portion of the project is taking place in close vicinity to a road with a significant and consistent level of traffic, so minimising disruption is extremely desirable.
With an expected total project length of 8 months, Adept Civil anticipates works will be completed in the second third of 2020.
This article was featured in the June 2020 edition of Trenchless Australasia. To view the magazine on your PC, Mac, tablet or mobile device, click here.
