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A Agitator Motor driven mixing arm in the bottom section of the shield in front of the suction pipe for stirring the excavated material mixed
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Mud which is pressure injected into the cutting face is mechanically mixed and agitated with the soil to produce muck The volume of this muck is adjusted with the screw conveyor and it is filled between the cutting face and shield bulkhead then pressure is applied by the shield s propelling this earth pressure is applied to
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microtunneling is done by a small TBM usually a series of cutters at the face and a slurry pipe to remove the spoil pipe is jacked in behind the machine most jacking and boring operations are much more low tech put a metal shield on the lead pipe and start pushing use an auger or hand dig under the shield remove the dirt using buggies or
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