A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Upper and Lower seams separated by shale split ranging with some of worst roof in Utah; 6-ft long bolts were installed about 4 ft apart in both directions and timber cross-bars added; 4000 ft of entry, 750 ft of cross cuts and 1300 ft of room work has been bolted; saving of approximately 550,000 lin ft of timber per year.
Upper and Lower seams separated by shale split ranging with some of worst roof in Utah; 6-ft long bolts were installed about 4 ft apart in both directions and timber cross-bars added; 4000 ft of entry, 750 ft of cross cuts and 1300 ft of room work has been bolted; saving of approximately 550,000 lin ft of timber per year.
Roof-bolting at Sunnyside
Coal Age
Peperakis, J. (author)
Coal Age ; 55
1950
4 pages
Illustrations
Article (Journal)
English
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| Engineering Index Backfile | 1953
| Engineering Index Backfile | 1952
| Engineering Index Backfile | 1951
| Engineering Index Backfile | 1950
| Engineering Index Backfile | 1957