Shield tunneling machine
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United States of America Patent
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Jul 11, 2006
Grant Date -
Apr 14, 2005
app pub date -
Sep 16, 2004
filing date -
Sep 22, 2003
priority date (Note) -
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Abstract
A shield tunneling machine has a shield body and a cutter head rotatably provided at the forward end of the shield body in the excavation direction. Abrasive jet spray nozzles for spraying abrasive jet water are movably provided on the cutter head. Obstacles encountered during excavation can be broken efficiently with high cutting quality by properly controlling the movable abrasive jet spray nozzles according to the size and configuration of each particular obstacle.
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