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Microtunnel boring machine (mtbm)
| Глоссарий по проходческим щитам (тоннелингу) |
Mtbm has a closed faced shield from which excavated soil is removed using a slurry, which also counterbalances groundwater and earth pressures. the machine is guided by a laser or other survey device mounted in the jacking shaft, which projects a beam onto a target in the articulated steering section of the mtbm. the mtbm is steered by extending or retracting remotely controlled steering jacks.
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Groundwater, английский
- Water within the earth that supplies wells and springs.
- Water from an aquifer or subsurface water source.
- Water stored beneath the surface in open pore spaces and fractures in rock.
- Water beneath the earth`s surface in the spaces between soil particles and between rock surfaces [compare with surface water].
- Water, near the surface of the ground, which passes through the subsoil.
- Грунтовые воды; подземные воды
- Water found underground as a result of rainfall, ice and snow melt, submerged rivers, lakes, and springs. this water often carries minerals. these minerals can accumulate in the remains of buried organisms and eventually cause fossilization.
- All subsurface water, as distinct from water on the surface.
- Water that seeps through soil and fills pores of underground rock formations; the source of water in springs and wells.
Articulated, английский
- With reference to a vehicle, hinged at the center for turning, as with a wheeled skidder (24).
- Шарнирный, шарнирно-со- членённый
Retracting, английский
- Уборка (напр, шасси) 481
- Уборка (напр, шасси)
Controlled, английский
- Управляемый; регулируемый
- Управляемый
- Подконтрольный (о предприятиях)
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Downhole drilling assemblies, английский
Mud motors and mechanical downhole motors used primarily to excavate hard soils and rock.
Condition assessment, английский
Methods for identifying and locating features that may affect the integrity and performance of a utility including defects, obstructions, leaks, infiltration, inflow, etc.
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