Excavation HandbookMcGraw-Hill, 1981 - 1000 halaman |
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Halaman 11-39
... hole . For the slanted hole inclined at 22.5 ° and of 47.9 - ft total length , spacing is 21 ft and burden is 21.6 ft . Total yield to grade is 672 yd3 or 14.0 yd3 / ft per foot of total length of hole . In the case of the slanted hole ...
... hole . For the slanted hole inclined at 22.5 ° and of 47.9 - ft total length , spacing is 21 ft and burden is 21.6 ft . Total yield to grade is 672 yd3 or 14.0 yd3 / ft per foot of total length of hole . In the case of the slanted hole ...
Halaman 11-123
... Hole Drill The down - the - hole percussion drill uses an air hammer which works in the bottom of the hole . The hammer imparts blows directly to the bit instead of to the top of the drill - rod assembly as in the case of the regular ...
... Hole Drill The down - the - hole percussion drill uses an air hammer which works in the bottom of the hole . The hammer imparts blows directly to the bit instead of to the top of the drill - rod assembly as in the case of the regular ...
Halaman 11-124
... hole air hammer . Rotary holes may be drilled up to maximum size for blasthole work . Percussive holes by down - the - hole air hammer may be drilled to about a 8 - in diameter . Such a drill is excellent for exploratory drilling where ...
... hole air hammer . Rotary holes may be drilled up to maximum size for blasthole work . Percussive holes by down - the - hole air hammer may be drilled to about a 8 - in diameter . Such a drill is excellent for exploratory drilling where ...
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ROCK WEATHERING | 3-4 |
LANDFORMS AND GEOMORPHOLOGY | 4-4 |
OPENCUT EXCAVATIONS | 5-3 |
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Istilah dan frasa umum
alluvium average axles backhoe blasthole borrow pit brake horsepower bucket bucket loader bulldozer calculated California capacity clearing and grubbing cofferdam compaction compactor compressor conveyor cost of ownership crawler-tractor cubic yard cybm cybm/h cysm depth diameter diesel engine dipper Direct job unit dragline dredge dumping efficiency electric embankment equation estimated explosives factor fill freeway friction ft/min ft/s gal/min grade granite haul road haulage head loss heavyweight hoist hole horsepower hourly production igneous igneous rock illustrates job unit cost lb/in² length limestone loading machine machinery material maximum medium metamorphic rocks mi/h off-the-road open-pit mining ownership and operation percent pipe pump quarry r/min rock excavation rock formation rock haulers rock-earth rolling resistance scraper sedimentary rock shovel shown in Figure slope soft specifications Table tare weight tire tons tow-type tractor tractor-bulldozer tractor-rippers truck valve velocity water wagon weight wellpoint wheels-tires width Work-cost indicator yd³