Trenchless technology is a type of subsurface
construction work that requires few trenches or no continuous trenches. It is a
rapidly growing sector of the construction
and civil engineering industry. 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
Trenchless construction includes
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 drilling and blasting techniques are larger versions of subsurface construction.
The difference between trenchless and other subsurface construction techniques
depends upon the size of the passage under construction.
The method requires considering soil
characteristics and the loads applied to the surface. In cases where the soil
is sandy, the water table is at shallow depth, or heavy loads like that of
urban traffic are expected, the depth of excavation has to be such that the pressure
of the load on the surface does not affect the bore, otherwise there is danger
of surface caving in.
Trade associations[edit]
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 (NASSCO) was established in 1976 and is the oldest such association with a trenchless focus. The North American Society for Trenchless Technology (NASTT) was established in 1990. The Indian Society for Trenchless Technology or 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 national trenchless technology societies associated with it. Several organizations bring out technical Journals for sensitizing the readers about such techniques. No Dig India is the official Journal of IndSTT.
Trenchless rehabilitation includes
such construction methods as sliplining,
thermoformed
pipe, pipe bursting,
shotcrete,
gunite, cured-in-place pipe (CIPP), 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. Mechanical
spot repair is applied where damaged pipelines
require the re-instatement of structural integrity. Sliplining, CIPP, and
thermoformed pipe lining involve pulling or inverting a new liner into an
existing pipe, then applying heat and/or pressure to force the liner to expand
to fill the pipe. CIPP technologies combine a carrier (felt or fibreglass)
impregnated with heat, ultraviolet light, or ambient curable resin to form a
"pipe within a 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.
The other methods are primarily for fixing spot leaks. Trenchless
rehabilitation methods are generally more cost-effective than traditional
exhume (dig) and replace methods.
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