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Reinforced concrete roof bolts
Experience with use of roof bolting in drill holes 18 mm in diam and 0.4 m deep in solid limestone of Mirglimsai lead-zinc mine; costs of reinforced concrete bolts is less than that of bolts with ribbed inserts.
Reinforced concrete roof bolts
Experience with use of roof bolting in drill holes 18 mm in diam and 0.4 m deep in solid limestone of Mirglimsai lead-zinc mine; costs of reinforced concrete bolts is less than that of bolts with ribbed inserts.
Reinforced concrete roof bolts
Zhelezobetonnaya shtangovaya krep
Ivanov, V.P. (author) / Lipovoi, A.I. (author)
1962
3 pages
Article (Journal)
Russian
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