The method by which access is gained to the required level underground for the installation, maintenance or inspection of a pipe, conduit or cable. The excavation is then backfilled and the surface restored. See Conventional TrenchingMethod in which access is gained by excavation from ground level to the required level underground for the installation, maintenance or inspection of a pipe, conduit or cable. The excavation is then backfilled and the surface reinstated..
ShieldA steel cylinder at the face of a utility tunnel or casing, which may sometimes employ the use of a mechanical excavator and may be steerable, and provide hazard protection from the area covered. in which manual excavation is carried out from within a steel tube at the front of a pipe jack.
Term referring to one mode of operation of a traditional TBMSee Tunnel Boring Machine..
A control or mechanism designed so that operator presence is necessary to activate a specific function.
OrangeburgOrangeburg is a bituminized fiber pipe. Manufactured as an alternative to metal pipe in response to a metal shortage due to World War II. The life expectancy from experience is about 25 years. This type of pipe has been known to collapse often necessitating replacement. is a bituminized fiber pipe. Manufactured as an alternative to metal pipe in response to a metal shortage due to World War II. The life expectancy from experience is about 25 years. This type of pipe has been known to collapse often necessitating replacement.