发明名称 |
METHOD OF AN APPARATUS FOR CRUSHING EARTH UNDER THE GROUND |
摘要 |
<p>Method and apparatus for crushing the earth under the ground by boring a hole; inserting a drill head having radially directed water jet thereon down the hole to the desired stratum; rotatingly moving the drill head upwardly while jetting water radially to form a cylindrical crushed area; lowering the drill head to the original depth; extending a water jet extender arm radially to a projecting position; again rotatingly moving the drill head upwardly while jetting water from the nozzles on the radial outward portions of the extender arm to radially enlarge the cylindrical crushed area, the rotation of the extender arm also stirring the already crushed area; returning the extender arm to an original waiting position; and lifting the drill head out of the hole.</p> |
申请公布号 |
CA1264658(A) |
申请公布日期 |
1990.01.23 |
申请号 |
CA19850482328 |
申请日期 |
1985.05.24 |
申请人 |
KAJIMA CORPORATION |
发明人 |
IKEDA, TARO;YAHIRO, TERUO;YOSHIDA, HIROSHI;NISHI, KENJI;ISOBE, TAKAHISA;HAMANO, HIDENOBU;KUME, YOICHI |
分类号 |
E21B7/18;E21B43/29;(IPC1-7):E21B7/18 |
主分类号 |
E21B7/18 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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