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 technology methods (TT) can be classified into 2 main divisions:
Trenchless Construction methods (TCM)
It involves different techniques that are related to the commencement of a new work or new project in underground. It may be a new conduit or pipeline installation in the site or any other new utility.
2. Trenchless Renewal Methods (TRM)
This method facilitate already existing utilities. It may be renewing or rehabilitation or renovation. This work is applied on old, existing utility or pipeline systems that may have some problem with their performance.
Irrespective of the type of construction project, the trenchless construction or renewal methods depends upon certain factors or parameter. They are:
Type of application
Range of work in diameter
Maximum lenght of installation