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Search the ASTT technical archive.
Papers, case studies, standards and webinars covering trenchless methods across Australia and New Zealand.
459 results (298 ASTT documents, 161 ISTT technique descriptions) · showing 73–96
Sustainable Pipeline Rehabilitation: Evaluating the Carbon Footprint/Inventory of CIPP Technology
Taiwan faces an exceptionally high risk from overlapping natural disasters, with over 70% of its population and territory exposed to multiple hazards. This study addresses the urgent need for resilient, sustainable infrastructure by proposing a circular economy-based life extension strategy for urban water mains,…
Li-Hsien Chen, Wei-Cheng Chen, Bo-Yi Li, Shubham S. Kolhe, Yan-Ting Kuo, Yu-Ping Wang, Yu-Chin Lin, Pei-Ying Chan, Kai-Ping Chang · 2025
The Capital Line project - Microtunneling Construction
The Capital Line project is part of the early works for the Capital Line South LRT Extension. Managing stormwater runoff from 23 Avenue and the future 111 Street underpass is critical to keeping the extension on schedule. The project includes a storage tunnel for groundwater and surface drainage, along with a lift…
Jason Liang · 2025
The Effect of Porosity and Degree of Cure in Needled Felt CIPP on Short-Term and Long-Term Flexural Properties
The life extension capabilities of CIPP for pipe rehabilitation are well established. The measured long-term flexural modulus creep retention factor (CRF) of CIPP has been employed to design numerous installations where the actual life extension has later been demonstrated. The CRF is determined by the CIPP system…
Tony Araujo, Bruce Yao, James Vandervelde, Kirsten Kjosness, Shekinah Grace King · 2025
The Evelyn Street Trunk Stormwater Upgrade Project
The Evelyn Street Trunk Stormwater Upgrade project consists of approx. 220m of DN1200 concrete drainage pipe to be installed via microtunnelling methods in Newstead, QLD. The project includes modifications to existing pit structures at the upstream location, the construction of a large custom maintenance structure,…
Tim Crawley · 2025
The Evolution and Comparative Assessment of Flexible Close-fit Liner Design Approaches based on North American and Global Practice
Since Insituform released their first Design Manual in North America in 1983 (based on UK research), the design of close-fit flexible liners has been continuously evolving to better capture liner performance in various geometrical configurations with enhanced confidence. While there was little change in liner design…
Chris Macey, Amin Tara · 2025
The Future is Fitted: How PMA Is Redefining Maintenance Hole Rehabilitation with PVC Panel Lok
In a market dominated by traditional coatings like epoxy, calcium aluminate cement (CAC), polyurea, and polyethylene, there was a requirement for alternative rehabilitation techniques. Panel PVC is setting a new benchmark in maintenance hole rehabilitation. A factory-manufactured, tight-fitting PVC panel system known…
Ian McNab, John Adamo · 2025
The Role of Flexural Strength in CIPP Liner Design and the Correct Means to Estimate its Long-Term Values
Understanding time-dependent material properties such as flexural modulus and flexural strength is essential for design and to ensure the longevity of CIPP liners. Flexural strength adjustments over time are commonly estimated by many designers as being proportional to creep retention of the flexural modulus in a…
Kay Awe, Chris Macey, George Bontus · 2025
The Tale of Two Cities and a Large Diameter Deteriorated Pipe with In-Line Geometric Transitions Continued….
At last years No-Dig North 2024 conference in Niagara Falls, Ontario, GEI Canada Consultants Inc. (GEI) presented on how we overcame significant constructability challenges to identify and prepare detailed designs for rehabilitation of the 1,500mm Lakeshore Sanitary Trunk, a 1,524mm bitumen steel pipe bridge crossing…
Jayne Harris, Taylor Vanderhoeden, Hassan Sadruddin · 2025
The Variability of Flexural Properties Within CIPP Field Samples
A critical component of CIPP installation quality assurance is the accurate measurement of flexural properties from field samples. This study quantifies the extent of property variation within typical CIPP field samples and compares results against well-controlled manufacturing processes. Testing of resin-felt and…
Bruce Yao, Tony Araujo, Jasmine Yang, James Vandervelde · 2025
Tibitoc-Casablanca water pressure pipeline: the most important drinking water line in Latin America using trenchless system
Bogotá is one of the biggest American continent capitals with 10 million residents including its metropolitan area and one of the most traffic-congested cities worldwide. In recent years, the city’s population has continued to grow annually, resulting in significant urban development and infrastructure expansion…
Juan José Hoyo Rodríguez · 2025
Tunneling or Tunnelling? Back to the basics on international trenchless vocabulary.
Trenchless technologies have become an integral part of constructing pipelines and tunnels across the world. As technologies are developed, piloted and become standards of practice they are expanded into new and emerging areas for practical use. In many cases, the applications are lost in translation between regions…
Maureen Carlin · 2025
Under Pressure: Trenchless Renewal Solutions for Pressure Pipelines
This paper examines Australia’s looming ‘infrastructure cliff’ – the challenge posed by ageing water pipelines and the urgent need for sustainable, cost-effective renewals. As much of the nation’s water infrastructure nears the end of its lifecycle, traditional dig-and-replace methods are increasingly unsustainable.…
Will Zillmann · 2025
Using Intelligent Desktop Assessment Methods to Match Advanced Condition Assessment Tools to Sewer Interceptor Network Vulnerabilities
Sewer Interceptor networks are typically comprised of large diameter critical pipes. In mature cities, the networks span pipes from centuries old brick, cast-in-place and precast concrete, clay tile to more modern materials including both thermoplastics and thermosetting composites. Older vintage pipes also often…
Chris C. Macey, Marya Jetten · 2025
Utilizing Artificial Intelligence to Support the City of Miami Beach SSES & Biscayne Bay Water Quality Improvement Program
This paper presents the City of Miami Beach’s transition to an innovative approach for assessing and rehabilitating its sanitary sewer system as part of its Sanitary Sewer Evaluation Survey (SSES) requirements. Traditionally, sewer condition assessments involved lengthy processes and redundant steps, which caused…
Samer Alkhatib, Patricia Rendon, Marya Jetten · 2025
Utilizing HDD and Finite Element Modeling to Achieve Seismic Resilience for the Golden Ears Forcemain River Crossings
Metro Vancouver (MV) recently constructed new sewer forcemain crossings under the Fraser River. The river crossings were installed using Horizontal Directional Drilling (HDD) method and forcemains in the north riverbank were installed using open cut and trenchless methods. The new sewer forcemains are classified as…
Yuxin “Wolfe” Lang, York Liao · 2025
Vacuum Microtunnelling: Creating a New Trenchless Horizon
Vacuum microtunnelling is reshaping the future of pipeline installation. Traditionally, trenchless methods have been reserved for specialist crossings, while open cut dominated broader pipeline works. However, advances in systems like AdaptX and modified AXIS machines — which combine the use of vacuum extraction to…
Stuart Harrison · 2025
Validating HDD Pull Force Predictions Through Real-Time Monitoring: CDS New Zealand’s Taihiki River Crossings
Specialist HDD contractor CDS New Zealand Limited recently completed the successful installation of three polyethylene water pipelines beneath the Taihiki River, linking Glenbrook Beach and Clarks Beach in Auckland. Commissioned by Watercare Services Limited, the project replaced a failed marine-laid watermain serving…
Sam Rowdon · 2025
Value of a Progressive Design Build vs. Design Bid Build Delivery Model for Rehabilitation Projects
In the civil construction industry, the choice between a Progressive-Design-Build (PDB) contract and a Traditional Design-Bid-Build (DBB) contract can significantly impact project outcomes. This paper explores two sewer rehabilitation project case studies in the Pacific-Northwest (Washington, USA) for King County: a…
Ann Fowler, Craig Vandaelle, Daniel Buonadonna, Matthew Tooley · 2025
Which Method Should We Use for Estimating the Pmax in HDD? Let’s Figure This Out Together Once and for All!
River crossing projects using the horizontal directional drilling (HDD) method often require drilling underneath embankment dams and levees, which are crucial infrastructures for flood control. In recent years, the U.S. Army Corps of Engineers (USACE) updated their Engineer Manual/Engineer Regulation related to…
Inshik Park, Alireza Bayat · 2025
“Entering a new dimension! The first GRP-Liner DN 2000 cured with UV-Light worldwide”
In the year 2020 IMPREG started with the planning and organization of an expanded product portfolio. Regarding the positive elements of curing for bigger diameter, the goals was to implement IMPREGLiner GL16 in the production and in the market worldwide. In the same with building up a new and improved impregnation…
2023
27 Ian Moore White Paper
Various sprayed repair systems are available to rehabilitate drainage infrastructure. These include epoxy, polyurea, and polyurethane sprays used on the inner surface of reinforced concrete maintenance holes to seal against leakage and to protect the concrete from biogenic corrosion. It also includes cementitious…
Ian D. Moore · 2023
39 Andrea Edney White Paper
Like other construction, trade and heavy industry sectors, the trenchless industry is a male dominated world. However, as with other traditionally male industries, female participation is growing, and increasingly women are making a positive contribution to the industry in various roles. This paper will present the…
Andrea Edney · 2023
A simplified theoretical prediction of vertical bending behaviour of structural pipe repair systems
Internal replacement pipe (IRP) system is an emerging trenchless pipeline repair technology. Vertical bending caused by surface loads from vehicular traffic is considered to be the worst condition for IRP systems, particularly for host pipes with circumferential discontinuities. However, available studies on the…
Shanika Kiriella, Allan Manalo, Cam Minh Tri Tien, Warna Karunasena, Hamid Ahmadi, Ahmad Salah · 2023
Aging Tanks Do Have Value – the Arcadia Vale Water Tank Strengthening Story
As critical water infrastructure ages, conditions deteriorating and with a need to maintain community service with minimal disruption, how do we rehabilitate and strengthen structures in a seismically active region? This is the challenge facing a 35m diameter by 10m high 9-megalitre (ML) prestressed concrete water…
Matthew Tooley · 2023