Trenchless Technologies - Pipe Jacking, Horizontal Directional Drilling, Pipe Rehabilitation

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Trenchless Technologies and their Impact

Author            :Prof. R L Sterling/ Mr. John Castle

Designation    :Chairman

Company        :International Society for Trenchless Technology

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Synopsis

'Necessity is the mother of Invention.' The 'necessity' for society in urban areas to take responsibility for public health and to deal with rampant cholera and typhoid epidemics in major Europen cities such as Hamburg, London and Paris arose in the first half of the 19th century and led first to the “invention” of modern piped filtered water supplies. This was followed, in the second half of the century, by the “invention” of modern sewer systems to remove waste water. And the cycle repeated its self a century later, in the mid-to-late 1900s, when the same necessity drove civil engineers to find ways of refurbishing and extending their original, but now ageing networks. Trenchless technologies, for the installation, upkeep and renovation of underground utility services with minimal excavation (No-Dig) became established as an increasingly important civil engineering technique in the late 1970s leading to the formation of the ISTT in 1986. The paper introduces the four main categories of trenchless technologies - pipe jacking, horizontal directional drilling, pipe rehabilitation and pipe replacement, and introduces top level considerations for their use for urban utility systems such as social costs, underground space utilisation, planning issues and “whose space is it anyway?” It concludes that too much work is still undertaken “because we always do it that way” and that decision makers are still largely unaware that there are now alternative ways to work on underground utilities which are both cheaper and more environmentally sustainable.

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