What is Trenchless Excavation ?
Definition of Trenchless excavation in Construction
Technique being used by utility contractors to install or replace utility lines, without the need to excavate a trench. The equipment used is called a directional drilling machine, that has the capability of laterally exerting a tremendous pushing pressure on a drill bit, which excavates a boring hole, that will accept a utility line. This has now become a popular trend for utility installation. The ability to install utilities without the need to open trenches, is understandably important, however its application for roadways, railroads, stream beds is extremely valuable. The use of trenchless excavation is a growing industry, and the equipment and techniques are constantly being improved.
Another method of trenchless utility installation is a method of utilizing the existing utility line, and pulling a new flexible synthetic line through it. This method is used to replace water and sewer lines and is being improved and developed quickly. Another operation that has been introduced and falls into the category of trenchless excavation, is the ability to line pipes that have been compromised. A latex or epoxy material is introduce into the pipe to be lined as a sleeve which is inserted into the original line. This sleeve is either filled with air, hot steam or water, to push the material against the inside walls of the original pipe. This application is allowed to remain with pressure within the line, until the coating against the inside of the utility line has cured. The pressure is removed from the pipe and normally a camera is inserted to inspect the inside of the line. Once the camera has confirmed a proper coating has been installed and there are no compromises, the line is returned to full service.