Design of Underground Installations in Rock: Space Layouts and Excavation Methods |
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22 ft high 31 ft wide bench blast doors Bottom Heading cars concrete cross section described in paragraph diameter diamond drills Diamond-Drill Hole Drill Hole drilling and blasting dumping EQUIPMENT FOR SINKING equipment for widening EXCAVATION COSTS Full Face Full-face fumes Grade ground Grout Gunite hard rock HIGH CHAMBERS hoist horizontal installations in rock lb/ft Leyner drills mounted Lin ft Long Holes manual material mechanical ventilation METHODS AND EQUIPMENT mucker mucking machine Needle Beams openings operations overbreak paragraph 3-58 percent personnel pillar pioneer heading placed planning portal pressure Principal equipment pumped rectangular shafts Refer to figure Ring Drilling rock bolts roof secondary entrances Section A-A SHAFT RAISING shotcrete shown in figure Spiling stage steel sets stopers storage surface timber tion track U. S. Army underground excavations underground installations Up-and-over loader ventilation vertical shafts walls wellpoints wide by 22 Widened by Ring width