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US 7,073,869 B2Granted
Shield tunneling machine
AssigneesNakakuro Construction Co., Ltd., Tokyo Metropolitan Sewerage Service Corporation
InventorKenichi Nakakuro
Life of this patent
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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.
Claims11
A shield tunneling machine comprising:
- a shield body;
- and
- a cutter head provided at a forward end of said shield body in an excavation direction, said cutter head being rotatable relative to said shield body,
- said cutter head comprising an enclosure that extends in a radial direction of said cutter head, a nozzle head disposed in said enclosure, at least two radially spaced abrasive jet spray nozzles supported by said nozzle head for spraying abrasive jet water,
- wherein said nozzle head is radially movable, and said enclosure is always supplied with cleaning water during operation of said cutter head so that said nozzle head is immersed in the cleaning water.
2 more elements
Dependencies are inferred from the claim text.