A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Roof bolting cost per lineal foot of haulage is less than one-tenth cost of conventional timbering in Sotesbury No. 8 mines, Raleigh County, W Va; practice includes using 8-bolt channels and installing four short bolts per channel when grading bottom, and shooting down some bolted roof few months after installation and then re-bolting.
Roof bolting cost per lineal foot of haulage is less than one-tenth cost of conventional timbering in Sotesbury No. 8 mines, Raleigh County, W Va; practice includes using 8-bolt channels and installing four short bolts per channel when grading bottom, and shooting down some bolted roof few months after installation and then re-bolting.
Bolting beats bad top
Coal Age
Edwards, J.H. (author)
Coal Age ; 38
1953
6 pages
Article (Journal)
English
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| Engineering Index Backfile | 1953
Online Contents | 1997
| Engineering Index Backfile | 1963