- Trenchless technology
Trenchless technology, as the name implies, stands for subsurface construction works where less trenches or no continuous trenches are required to be dug. It is a rapidly growing sector of the
constructionand civil engineeringindustry. It can be defined as "A family of methods, materials, and equipment capable of being used for the installation of new or replacement or rehabilitation of existing underground infrastructure with minimal disruption to surface traffic, business, and other activities." [ http://www.nastt.org/ North American Society for Trenchless Technology]
Trenchless construction refers to such construction methods as
tunneling, microtunneling(MTM), horizontal directional drilling(HDD) also known as directional boring, pipe ramming(PR), pipe Jacking(PJ), moling, horizontal auger boring(HAB) and other methods for the installation of pipelines and cables below the ground with minimal excavation. Large diameter tunnels such as those constructed by a tunnel boring machine( TBM), and drill-and-blasttechniques are larger versions of subsurface construction. The difference between trenchless and other subsurface construction techniques depends upon the size of the passage under construction. If a subsurface construction does not permit human entry it is termed as trenchless.
Trenchless rehabilitation refers to such construction methods as
sliplining, thermoformed pipe, pipe bursting, shotcrete, gunite, cured-in-place pipe, grout-in-place pipe, mechanical spot repair, and other methods for the repair, rehabilitation, or replacement of existing buried pipes and structures without excavation, or at least with minimal excavation. Sliplining and thermoformed pipe lining involve pulling a new liner through an existing pipe, then applying heat and/or pressure to force the liner to expand to fill the pipe. Pipe bursting fractures a pipe from the inside and forces the fragments outwards while a new pipe is drawn in to replace the old. [cite paper
publisher=U.S. Army Corps of Engineers Engineering Research and Development Center
author=Simicevic, Jadranka and Sterling, Raymond L.
title=Guidelines for Pipe Bursting,TTC Technical Report #2001.02 ] The other methods are primarily for fixing spot leaks.Trenchless rehabilitation methods are generally more cost-effective than traditional exhume (dig) and replace methods.
The trenchless technology industry is represented by several industry associations in addition to standing committees within almost every water and sewer related industry association. The National Association of Sewer Service Companies was established in 1976 and is the oldest such association with a trenchless focus. The
Indian Society for Trenchless Technologyor IndSTT is the apex organization to promote Trenchless Technology in South Asia. It was established in 1995 with its head office at New Delhi. The International Society for Trenchless Technology, established in 1986, has 25 active [http://www.istt.com/index.cfm?menuID=32 national trenchless technology societies] associated with it. Several organizations bring out Technical Journals for sensitizing the readers about such techniques. [http://www.indstt.org/ndi.html No Dig India] is the official Journal of IndSTT.
* [http://www.redzone.com/trenchless Trenchless Technology, what is it anyway?]
* [http://www.indstt.org/ Indian Society for Trenchless Technology]
* [http://www.ukstt.org.uk/ United Kingdom Society for Trenchless Technology]
* [http://www.cuire.org/ Center for Underground Infrastructure Research and Education CUIRE]
* [http://www.perco.co.uk/ Perco - The UK leader in trenchless technology]
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Trenchless technology — Este artículo o sección sobre tecnología necesita ser wikificado con un formato acorde a las convenciones de estilo. Por favor, edítalo para que las cumpla. Mientras tanto, no elimines este aviso puesto el 11 de junio de 2008. También puedes… … Wikipedia Español
International Society for Trenchless Technology — The International Society for Trenchless Technology or ISTT is an organization founded in 1986 to promote and advance Trenchless Technology.ISTT encourages the formation and affiliation of societies sharing its objectives world wide. There are… … Wikipedia
China Hong Kong Society for Trenchless Technology — The China Hong Kong Society for Trenchless Technology or CHKSTT was established in 1999 and is one of the societies affiliated to the ISTT. Other societies in the Greater China region include those in Shanghai (SSTT), Beijing (BJSTT), Guangdong… … Wikipedia
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National Association of Sewer Service Companies — The National Association of Sewer Service Companies or NASSCO is a North American trade organization, established in 1976 to improve the success rate of everyone involved in the pipeline rehabilitation industry through education, technical… … Wikipedia
Directional boring — A small directional boring unit in action Directional boring, commonly called horizontal directional drilling or HDD, is a steerable trenchless method of installing underground pipes, conduits and cables in a shallow arc along a prescribed bore… … Wikipedia
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Microtunneling — As the name implies, microtunneling is a digging technique used to construct small tunnels. These small diameter tunnels make it impossible to have an operator in the machine itself. Instead, the microtunnel boring machine (MTBM) must be operated … Wikipedia
Túnel — Para otros usos de este término, véase Túnel (desambiguación). Túnel para ferrocarril en Sant Pol de Mar, (Barcelona,España) … Wikipedia Español