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Closed circuit television (cctv)
| Глоссарий по проходческим щитам (тоннелингу) |
Video cameras mounted on small tractor devices or sleds and driven or pulled through a pipeline commonly used to inspect repairs and to assess the condition of the pipe.
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Thrust pit, английский
Working shaft at the beginning of the jacked section of pipeline in which the specialist equipment is installed, and from which jacking operations are carried out.
Earth pressure balance machine (epbm), английский
Type of microtunnelling machine in which mechanical pressure is applied to the material at the face and controlled to provide the correct counter-balance to earth pressure to prevent heave or subsidence. the term is usually employed where the pressure originates from the main jacking station in the drive shaft or to systems in which the primary counter-balance to the earth pressure is supplied by pressurised drilling fluid or slurry.
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