The International Society for Trenchless Technology

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Microtunnel Boring Machine (MTBM)

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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