| 摘要 |
A mine roof support is provided having a roof engaging member 10 and at least two interconnected load bearing members 19 and 21, one of which 19 is pivotally connected to the roof engaging member 10. The use of such interconnected load bearing members makes it possible to make use, in a very effective and versatile manner, of a combination of support techniques such as forepoling and spragging in such a manner that it is possible to cope with adverse conditions where the required strata control could not otherwise be achieved without resorting to drilling and dowelling. <IMAGE> |
