发明名称 |
Collapsible crib mining support column |
摘要 |
A roof support column used as a support between the roof and floor of a mine comprises a stacked series of hollow roof support cribs containing a mixture of light-weight aggregate such as volcanic lava, tuft, or pumice, and a chemical foam contained in a double-walled high density paper tubing. The combination of these materials results in a roof support crib which has the yielding characteristics of wood. Such cribs called variable yielding cribs are stacked and locked on top of one another to form a vertical cylindrical cribbing support column.
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申请公布号 |
US5342150(A) |
申请公布日期 |
1994.08.30 |
申请号 |
US19930023618 |
申请日期 |
1993.02.26 |
申请人 |
MOUNTAINLAND SUPPORT, INC. |
发明人 |
KITCHEN, CHRIS D. |
分类号 |
E21D15/00;E21D15/12;(IPC1-7):E21D11/00 |
主分类号 |
E21D15/00 |
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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