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1. 发明授权

US3865202A Water jet drill bit 失效
标题翻译：水喷枪钻头
公开(公告)号：US3865202A
公开(公告)日：1975-02-11
申请号：US36899973
申请日：1973-06-11
申请人： JAPAN NATIONAL RAILWAY
发明人： TAKAHASHI HIKOJI , MISAWA SEISUKE , TAKAHASHI AKINORI , YOSHIMURA HISASHI
IPC分类号： E21D9/10 , E21C25/60 , E21D9/11 , E21B9/35
CPC分类号： E21D9/11 , E21C25/60
摘要： A rock is excavated by the steps of forming at least one groove in the rock by a water jet, forcing a first single-bevel cutter into the rock while the cutter is moved along a line parallel to and spaced apart from the groove so that cracks formed by the cutter and reaching the groove are thereby formed mostly by tensile failure of the rock, further forcing the first cutter through the rock until a succeeding second single-bevel cutter moving along a path further from the groove than the first cutter is forced against the rock so that cracks starting from the second cutter and reaching the groove are thereby formed, and continuing this procedure similarly until all of several sequentially staggered and succeeding cutters act on the rock. The apparatus has an excavation head on which nozzles and cutters are so arranged that the above described method can be put into practice thereby.
摘要翻译：通过以下步骤挖掘岩石：通过水射流在岩石中形成至少一个凹槽的步骤，迫使第一单斜切刀进入岩石，同时切割器沿着平行于并与凹槽间隔的线移动，使得裂纹由切割器形成并到达凹槽由此主要由岩石的拉伸破坏形成，进一步迫使第一切割器穿过岩石，直到沿着比第一切割器更远离凹槽的路径移动的后续第二单斜切刀具被迫抵抗从而形成从第二切割器开始到达凹槽的裂纹，并且类似地继续该过程，直到所有几个顺序交错和后续的切割器作用在岩石上。该设备具有挖掘头，喷嘴和切割器布置成使得上述方法能够被实施。

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