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Downhole drilling assemblies
| Глоссарий по проходческим щитам (тоннелингу) |
Mud motors and mechanical downhole motors used primarily to excavate hard soils and rock.
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Mechanical, английский
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Ground penetrating radar, английский
Nondestructive method for detecting subsurface structures, voids, discontinuities, and changes in material. gpr uses radar pulses transmitted into the ground to image the subsurface by recording electromagnetic signals reflected back to the gpr system.
Microtunnel boring machine (mtbm), английский
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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