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A subterranean excavator that moves forward by utilizing the reaction force of segments assembled in the back of the machine while pressing and rotating (vibrating) its cutter head onto underground layers.
There is a delivery record of accomplishment of a machine with a large diameter as large as 7.75 m used for a distance as long as 5000 m with 10-m-long radical curves.
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A tunneling machine that moves forward by utilizing the reaction force of a vertical shaft installation (e.g., a bottom-end pushing device) and a jacking pipe pushed underground. This method differs from the automatic tunneling method of shield machines. |
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