Trenchless technology - the future of construction OTrenchless technology is increasingly accepted worldwide as being more efficient, less disruptive, environmentally friendly and more cost effective than traditional methods. The UKSTT (United Kingdom Society for Trenchless Technology) is a registered charity involved in the development and promotion of trenchless techniques, sometimes termed no-dig techniques. Trenchless technology is the science of installing, repairing or renewing underground pipes, ducts and cables using techniques that minimise or eliminate the need for excavation. The use of such techniques can reduce environmental impact, social costs and at the same time provide economic alternatives to traditional open cut methods of installation, renewal or repair. The techniques themselves can be broken down into three areas: • Repair and Renovation – including cleaning, localised repair • techniques and lining techniques. • Replacement – including pipebursting, pipe splitting, pipe eating and • lead extraction & replacement systems • New Installation – including impact moling, pipe ramming, auger • boring & thrust boring, pipe jacking, micro tunnelling, guided rod • pushing, guided boring & directional drilling, rock boring, cable • pulling and cable blow in systems. Essential to the success of such methods are training, thorough site survey, planning, material and equipment choice. The aims and objectives of UKSTT are: • To advance the science and practice of trenchless technology
• for the public benefit. • To promote education, training, • study and research in the science and practice. • To encourage the use of trenchless systems for the installation and • repair of underground pipelines, utilities and services. • To promote the location and mapping of underground services. • To encourage the development of new trenchless techniques. • To assist members to maintain and enhance their knowledge, skills • and capabilities in the field of trenchless technology. R • For further information visit www.ukstt.org.uk.
World’s first application of latest pipeline rehabilitation technology OPortland, in Dorset, recently saw the world’s first commercial application of the latest development in pipeline rehabilitation technology – the new Melt-In-Place Pipe (MIPP™) system, known as Aqualiner, was installed for Wessex Water by its main rehabilitation contracting partner OnSite Central Ltd. Whilst the project may not be the largest, it was significant for both Portland and Aqualiner Ltd. Using the latest ‘third generation’ commercial system, it was the first ever to be undertaken on a ‘paid for’ basis. The lining comprised the rehabilitation of just 23m of existing 225mm diameter clay sewer pipe which runs beneath Castle Road at between 1.5 and 2m deep. The work, scheduled to last one day working between manholes with a full traffic flow allowed alongside, would have taken 7-10 days of traditional open cut trenching with huge and unacceptable disruption. In the event, the lining installation process took just over 2 hours. The Aqualiner process, whilst similar to existing relining systems, differs in some significant aspects. It does not utilise resins or chemicals as part of the lining process, rather it uses a liner material which comprises a combination of glass fibres, for stiffness and strength, and thermoplastic polymer fibres which, after processing, becomes the matrix that surrounds the reinforcing fibres. This absence of chemicals in the liner process and its standard material content and strength means the Aqualiner system is not only suitable for installation in sewer systems but also pressure pipes, including potable water pipes. The process is even reversible. By heating the liner to the correct temperature the liner can be removed if required with all the materials being fully recyclable. R
Environment UK Directory and Magazine