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.
Production waste and other material that accumulates in sewers or manholes.