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Flat jacks pre-load massive mine supports
Construction, testing, and preloading of 10 large prestressed concrete mine pillars show that roof over and around pillar should be pattern bolted, and bolts should be retightened several times; pillar should be built monolithically of high grade concrete, and prestressed with external banding; second set of flat jacks should permit high ultimate loading after first set eliminated excess structural slack.
Flat jacks pre-load massive mine supports
Construction, testing, and preloading of 10 large prestressed concrete mine pillars show that roof over and around pillar should be pattern bolted, and bolts should be retightened several times; pillar should be built monolithically of high grade concrete, and prestressed with external banding; second set of flat jacks should permit high ultimate loading after first set eliminated excess structural slack.
Flat jacks pre-load massive mine supports
Pennsylvania State Univ -- Mineral Experiment Station -- Bul
Reed, J.J. (author) / Mann, C.D. (author)
1961
8 pages
Report
English
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