发明名称 |
DEVICE FOR WIDENING BORE-HOLES IN GROUND |
摘要 |
FIELD: construction engineering. SUBSTANCE: increased drilling speed and simplified mounting and operation are achieved due to making shoulder movable in axial direction relative to body of pneumatic puncher and possibility of its fixing in any required position. Shoulder is provided with surface which embraces smaller stage of longitudinal sections of widener. Aforesaid surface can be made cylindrical or tapered. This embodiment of device simultaneously ensures optimization of bore-hole driving speed depending on density of ground, prevents radial or axial displacement of widener relative to body of pneumatic puncher, simplifies erection of widener on pneumatic puncher and removal of device from bore-hole. EFFECT: higher efficiency. 4 cl, 5 dwgi
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申请公布号 |
RU2109910(C1) |
申请公布日期 |
1998.04.27 |
申请号 |
RU19960110829 |
申请日期 |
1996.05.29 |
申请人 |
INSTITUT GORNOGO DELA SO RAN |
发明人 |
KURLENJA M.V.;SKACHKOV K.B.;TKACH KH.B.;KURLENJA M.V.;SKACHKOV K.B.;TKACH KH.B. |
分类号 |
E21B7/28;(IPC1-7):E21B7/28 |
主分类号 |
E21B7/28 |
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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