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Showing: 1 to 10 of 146 matches for "jack leg"  Page   1   2   3   4   5   6   7   8   9  next TITLE Shortwall Mining - Potential And Problems  SUMMARY ... supporting it with a short hydraulic jack leg. This arrangement provides the additional strength required in the support. It should ... AUTHOR Stefanko, Robert, Ph.D. PUBLISHED 1981 TITLE Rapid Excavation - A Perpetual Goal  SUMMARY ... The introduction of jack-leg drills was accelerated when miners recog- nized that it was easier to complete drill rounds with the lightweight jack-leg drill ... AUTHOR Garfield, Lawrence A. PUBLISHED 1971 TITLE Interstate Route H-3 Alternative Dowel Testing Program  SUMMARY ... All holes were percussion drilled with a Gardner-Denver jack leg drill. The ... The bars were attached to the jack leg with a short-length coupler. ... AUTHOR Boyce, Glenn M. ; Abramson, Lee W. PUBLISHED 1991 TITLE Performance of Grouting Programin Cambridge Argillite at Inter-Island Tunnel  SUMMARY ... Typical drill patterns are described in Figure 3. The primary drilling equipment to advance individual grout holes included a jack leg. ... AUTHOR Page, Troy L. ; Crouthamel, David R. ; Fong, Francis L. PUBLISHED 1997 TITLE Field Performance Evaluation Of A Rock Drill Handle Design  SUMMARY ... This is in contrast to the steel handle, which is fixed, and control of the jack leg pressure is achieved by adjusting a thumbwheel located in one end of the ... AUTHOR De Souza, E. M. ; Moore, T. N. PUBLISHED 1994 TITLE Land Shaft Construction And Initial Station Development For Seabrook Station Cooling Water Tunnels  SUMMARY ... The north wall of the shaft was drilled horizontally with jack leg drills, three rounds were taken between elev (-)234 and (-)249, and the brow rounded off to ... AUTHOR Hulshizer, Allen J. ; Stuart, Jack C. ; Obradovic, Robert L. ; Stewart, Anthony J. PUBLISHED 1979 TITLE Metal Mining - Underground Mining Trends in the Great Swedish Export Iron Ore Mines  SUMMARY ... By thorough work and time studies there was de- signed, in collaboration with Atlas-Diesel Co., the well-known air-leg or jack-leg in combination with a number ... AUTHOR Hjortzberg-Nordlund, Borje PUBLISHED 1953 TITLE Underground Mining Trends In The Great Swedish Export Iron Ore Mines  SUMMARY ... By thorough work and time studies there was de- signed, in collaboration with Atlas-Diesel Co., the well-known air-leg or jack-leg in combination with a number ... AUTHOR Hjortzberg-Nordlund, Borje PUBLISHED 1952 TITLE Dexing Copper Project is Porphyry Bonanza  SUMMARY Page 1. Dexing Copper Project isPorphyry Bonanza A 10-kUd open pit precedes expansion plans at Dexing Perhaps the most significant ... PUBLISHED 1980 TITLE Mechanized Mining of Narrow Veins – Problems and Equipment Options  SUMMARY ... profitability of nar- row vein mines. In most cases, it is done by pneumatic jack- leg drills. Due to workforce safety reasons, as ... AUTHOR Paraszczak, Jacek PUBLISHED 1992 Showing: 1 to 10 of 146 matches for "jack leg"  Page   1   2   3   4   5   6   7   8   9  next Search Again