| 发明名称 |
Core drilling in rock and ice - uses hydraulic breaker flat jacks as side cutters to enlarge boreholes and to remove debris |
| 摘要 |
Core drilling of large holes in rock and ice using side cutters in the form of hydraulic breaker flat jacks to complete the breaking of the cores. The flat jacks conform to the shape of the fissures cut out in the rock. USE/ADVANTAGE - The method allows deeper and longer shafts to be bored.
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| 申请公布号 |
DE3918799(A1) |
申请公布日期 |
1990.12.13 |
| 申请号 |
DE19893918799 |
申请日期 |
1989.06.06 |
| 申请人 |
DROZDOWSKI, FELIKS LEONARD, 5000 KOELN, DE |
发明人 |
VERZICHT DES ERFINDERS AUF NENNUNG |
| 分类号 |
E21B4/18;E21B7/00;E21B10/32;E21B25/00;E21B25/06;E21B25/10 |
主分类号 |
E21B4/18 |
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