Excavation HandbookMcGraw-Hill, 1981 - 1000 halaman |
Dari dalam buku
Hasil 1-3 dari 96
Halaman 7-13
... drill will put down the following hourly footages of 11⁄2 - in - diameter hole with drilling efficiency at 33 percent : Class of rock Speed , ft / h Soft Medium Hard 14-20 8-14 0-8 In most blasting work the drilling is done by ...
... drill will put down the following hourly footages of 11⁄2 - in - diameter hole with drilling efficiency at 33 percent : Class of rock Speed , ft / h Soft Medium Hard 14-20 8-14 0-8 In most blasting work the drilling is done by ...
Halaman 7-14
... drill steel . Not shown is the single - chisel bit for short holes in soft to medium rock . ( Timken Roller Bearing Company . ) drilling speeds would be significant for making drilling and blasting plans for the job under investigation ...
... drill steel . Not shown is the single - chisel bit for short holes in soft to medium rock . ( Timken Roller Bearing Company . ) drilling speeds would be significant for making drilling and blasting plans for the job under investigation ...
Halaman 7-17
... drill , the rotary drill using either drag bit or tricone bit furnishes valuable data anticipatory to future drilling and blasting . This is especially true if use of the rotary drill with tricone bit is planned for the blasthole drilling ...
... drill , the rotary drill using either drag bit or tricone bit furnishes valuable data anticipatory to future drilling and blasting . This is especially true if use of the rotary drill with tricone bit is planned for the blasthole drilling ...
Isi
ROCK WEATHERING | 3-4 |
LANDFORMS AND GEOMORPHOLOGY | 4-4 |
OPENCUT EXCAVATIONS | 5-3 |
Hak Cipta | |
26 bagian lainnya tidak diperlihatkan
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