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Prestressed, preloaded concrete pillars give better roof control
To prevent roof settlement and caving when replacing rock pillars, preloaded and prestressed concrete pillars have been developed which minimize settlement of roof; although expensive these pillars can be used to safeguard important installations and have been designed up to strengths of 6417 psi.
Prestressed, preloaded concrete pillars give better roof control
To prevent roof settlement and caving when replacing rock pillars, preloaded and prestressed concrete pillars have been developed which minimize settlement of roof; although expensive these pillars can be used to safeguard important installations and have been designed up to strengths of 6417 psi.
Prestressed, preloaded concrete pillars give better roof control
Eng Min J
Reed, J.J. (author) / Mann, C.D. (author)
1960
6 pages
Article (Journal)
English
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