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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 193–216
Epping Main Sewer Pipejack: Challenges and Resolutions
This paper will discuss a new installation of sewer pipeline utilising Microtunnelling/pipe jacking technique. The Epping Main Sewer project comprises 2.3km of 1600mm and 1800mm internal diameter sewer at depths ranging from 15m up to 42m. Five manholes will be installed after the completion of the tunnel drives. The…
Jiang Aizezi, Ashley Hamer · 2019
First Installation of a PE100 HSCR Pipe by Horizontal Directional Drilling in Yeppoon QLD
The Livingstone Shire located on Queensland’s Capricorn Coast is experiencing gradual population growth and is investing to augment the capacity of its potable water distribution infrastructure. The crossing of Causeway Lake estuary represents an important connection of which capacity expansion was limited as the…
Dr Jeroen Wassenaar · 2019
Geotechnical Investigations for Trenchless Projects: a Designer’s Perspective
Geotechnical site investigations, associated laboratory testing and reports are often commissioned by authorities or their representatives early in a project’s life. The report(s) often looks very much like the last one, particular for small to medium sized projects. The geotechnical report(s) are used for a large…
John Bower · 2019
Hawthorn Sewer Relining Program
As of May 2017, there was a total of 9,200km of gravity sewers located throughout the Yarra Valley Water (YVW) service area. Some of these gravity sewers are more than 100 years old and have been shown to be prone to sudden structural failure. To avoid the risks associated with structural failure, YVW operates a…
Alberto Vela, Jamie Lynch · 2019
Industry and Asset Owners – Engaging at a Deeper Level
Boring technology poses unique threats to gas transmission pipelines (GTPs), and GTPs have unique characteristics and risks which need to be understood. Ensuring we have appropriate engage between asset owners and industry is the key to keeping everyone safe, and maintain the standing of our relevant professions.…
Ross Larsen · 2019
Large Diameter vs. Small Diameter Sewers: the Case for a Multi-Dimensional Approach to Conduct Condition Assessment of 40-YEARS Old Sewer Pipeline Network
During past decades, new technologies and equipment have been introduced to underground infrastructure industry in order to provide easier, faster, and better performance on cleaning and inspection of sewer pipes. Although cleaning and inspection of sewer line is classified as regular maintenance and common practices…
Ardalan Mahshanianand Hamed Zamenian · 2019
Large Trunk Sewer Siltation Headaches; Working Towards a Cure
For decades water authorities around Australia have struggled with managing siltation problems in large trunk sewers (>3m diameter), and the difficulties in removing silt from these critical sewers whilst they are in operation at nearly peak capacity with difficult access and limited means for diverting flows. This…
Shariff Shockair · 2019
Microtunnelling Design Utilising All Significant Rock Properties
Although most microtunnelling machines (MTBMs) use slurry to support the face and transport the muck, they may also be used open faced when boring through soft to medium strength sedimentary rocks, in relatively dry states. Bamford Rock Testing Services (BRTS) has recently developed the capability to numerically model…
Dr Bill Bamford · 2019
Mitigating Inadvertent Returns in Horizontal Directional Drilling
Inadvertent returns during horizontal directional drilling (HDD) may occur when the downhole pressure is too high and can become a concern when the fluids reach the ground level or a enter a body of water. Bore planning is the first step in helping to avoid inadvertent returns. A well-crafted bore plan needs to…
Cory Mass, Tod Michael · 2019
New standards for testing and certifying cured-in-place pipe (CIPP) as watertight
The use of Cured-In-Place Pipe (CIPP) and other trenchless lining solutions have been an accepted method for pipe rehabilitation for over 40 years. Despite the requirement to submit sample pieces of liners or coupons with final video files from high resolution Closed-Circuit Television (CCTV) cameras, a growing number…
Chuck Hansen · 2019
Numerical Study on the Effect of Defects on the Performance of Spray Lined Cast Iron Pipes
Due to aging and deterioration, water pipelines, especially cast iron pipelines, are gradually approaching the end of their design life. To more effectively reline these deteriorated pipelines, water utilities have been seeking new solutions for pipe rehabilitation. Various technologies have been developed, among…
Guoyang Fu, Benjamin Shannon, Suranji Rathnayaka, Ravin Deo, Chunshun Zhang, Jayantha Kodikara · 2019
Phased geotechnical investigations for a long HDD crossing under a drowned valley estuary
A good understanding of ground conditions, through developing a detailed geotechnical model, is key to successful trenchless installation, particularly for long-distance crossings. Geotechnical investigations are undertaken for HDD projects to identify and manage risks such as steering issues, frac-out, blow-out and…
Clifton Thompson · 2019
Planning and Delivering Successful Trenchless Projects
Due to aging infrastructure in our cities, the increase of urban densities and heightened environmental awareness the use of Trenchless Technology is being considered more and more for the installation of new utility assets as well as the need to augment/replace/upgrade existing assets. Even though there are…
Adam Shayler · 2019
Pressure-Based Leakage Characterisation of Water Pipes
A significant amount of research has been done on the behaviour of leakage from water pipes with changes in pressure. It is now widely accepted that the areas of most leaks are not fixed, as is assumed in the orifice equation, but vary with pressure. In addition, the variation in leakage area has been shown to be a…
Prof Jakobus van Zyl · 2019
Sliplining and grouting - how hard can it be
Designers, Contractors and Principals push the boundaries of trenchless technology in pursuit of greater lengths and diameters, to achieve stretched technical and financial objectives. This pressure for continuing performance improvements has widened the application of horizontal directional drilling (HDD),…
Maurice Lubbock, Punam Halai · 2019
Sliplining Tyers River Conduit Tunnels – Gippsland Water
This project involved the sliplining of two 60 year old prestressed concrete tunnels with Glass Reinforced Polymer (GRP) pipe. The two tunnels are part of the Tyers River Conduit (TRC), the main transfer pipeline from the Moondarra Dam to the Latrobe Valley. The tunnels; Boola and Blairs are 1520mm internal diameter…
Sirimath Dep · 2019
Smart Linings for Longer Pipe Life
Water Services Association of Australia (WSAA) is leading a $24 million international project investigating innovation into smart lining for pipes and infrastructure. The Australian Government, through the Cooperative Research Centre (CRC), has funded $3 million to this partnership, comprising of over 30 project…
James Gardner · 2019
Tauranga Southern Pipeline - Harbour Crossing
The Tauranga Southern Pipeline Harbour Crossing is one of the largest HDD crossings completed in the region in recent times. It involved the completion of a 1560m long HDD crossing to accommodate a 914mm diameter steel casing. a DN800 HDPE pipe was then installed within the steel casing. The project required the…
John Stuart-Robertson · 2019
Testing Regime for Fit-For-Purpose Semi-Structural and Structural Pipe Lining
Deterioration of buried water and sewer pipes is an emerging concern among many utilities in Australia. For critical water pipes, economical methods of pipe rehabilitation, reduced replacement time resulting in minimum water interruption are priorities for water utilities. Rehabilitation of old water pipes by…
Benjamin Shannon, Suranji Rathnayaka, Guoyang Fu, Ravin Deo, Chunshun Zhang, Jayantha Kodikara · 2019
The process and benefits of direct pipe for the Army Bay ocean outfall (NZ)
In 2017, the Army Bay Ocean Outfall was a standout project for New Zealand. Technically complex, it pushed the boundaries of what is possible with the Direct Pipe® method and set a record for the longest Direct Pipe® installation at just under 2 km of DN1200 steelpipe, in a single drive. Watercare’s planning for the…
Paul Cooper, John McCann · 2019
Trenchless Rehabilitation of City of Gold Coast’s DN600 Sewer Rising Main
Rehabilitation of the Eastern Force Main for the City of Gold Coast (City) saw the Southern Hemisphere’s first installation of a kevlar reinforced Primus Line pressure liner in a sewer rising main. The City experienced a failure of the critical DN600 mild steel, cement lined main running under Biggera Creek just…
Will Zillmann, Christian Truscott, Geoff Spencer · 2019
Trenchless Rehabilitation of the Upper Hobsons Bay Main Sewer
Rehabilitation of the 110-year-old Upper Hobsons Bay sewer in Melbourne saw the completion of one of the world’s largest UV-cured fibreglass CIPP lining projects. The project included 32 lengths of ovoid sewer with internal dimensions of up to 1200m x 825mm over a total of some 3.5 kilometres. In addition, 1,100…
Matthew Pratt, John Monro · 2019
Utility Location Skill Development an Eyeglass Into New Zealand
Many of us that have been involved on the ground floor of Underground Utility Location, Damage Prevention, Asset Management, and Subsurface Geospatial Survey and Mapping, anywhere around the world, can hopefully all agree on this one fact: *We need to come together as a global industry/community, to encourage the…
Elle Archer · 2019
A Guide to Quality Assurance Programs for Contractors
Trenchless projects can be challenging to implement, since they often use technologies at the forefront of current practice, which are less familiar to clients and contractors than more conventional pipe construction techniques. However, the outcome may be put at additional unnecessary risk if the project plan does…
Maurice Lubbock · 2017