The Modern Technique of Rock BlastingWiley, 1978 - 438 halaman |
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Halaman 78
... steels . These series begin with a bit gage between 42 and 34 mm ( 1.7 and 1.35 in ) . The lengths of the drills in a series are 0.8 m , 1.6 m , 2.4 m and so on . For every new length the bit gage is 1 mm less than for the previous one ...
... steels . These series begin with a bit gage between 42 and 34 mm ( 1.7 and 1.35 in ) . The lengths of the drills in a series are 0.8 m , 1.6 m , 2.4 m and so on . For every new length the bit gage is 1 mm less than for the previous one ...
Halaman 79
... steels the diameter of the bits is more than 37 mm ( 1.5 in ) and the swell condition ( 3 : 6 ) must be regarded when it is a question of multiple - row rounds . For those drill steels the maximum burdens are found in table 3 : 1 for ...
... steels the diameter of the bits is more than 37 mm ( 1.5 in ) and the swell condition ( 3 : 6 ) must be regarded when it is a question of multiple - row rounds . For those drill steels the maximum burdens are found in table 3 : 1 for ...
Halaman 100
... steel plate . a ) 35 % NGl . b ) 50 % NGI . d . Practical experience The pneumatic cartridge loader has been in ... steels . Holes up to 40 m ( 135 ft ) long 100 Practical experience.
... steel plate . a ) 35 % NGl . b ) 50 % NGI . d . Practical experience The pneumatic cartridge loader has been in ... steels . Holes up to 40 m ( 135 ft ) long 100 Practical experience.
Isi
Symbols used | 16 |
Calculation of the charge General part | 28 |
Calculation of the charge Practical application | 69 |
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Istilah dan frasa umum
advance per round Ammonit ammonium nitrate AN-oil angle of breakage bench blasting bench height blasting gelatine bottom charge burn cuts calculations cartridges cm/m column charge concentration of charge connection corresponding cracks cylinder cuts damage degree of packing detonators deviation diagram distance dm³ drill hole drilled depth drilling cost drilling pattern dynamite effect electric empty hole energy example faults flash-over fragmentation frequency gives greater ground vibrations ignition pattern increased indicated instantaneous interval kg/m kg/m³ Langefors-Kihlström lb/cu.ft lb/cu.yd lb/ft loading tube lower maximum burden meter multiple-row rounds Nabit Nitroglycerin Nonel number of holes obtained ordinary delay parallel hole cuts practical burden presplitting pressure reduced risk rock blasting rock factor row of holes shock wave slope smooth blasting specific charge sq.ft stoping Sweden swelling Täby throw tion tunnel underwater blasting V₁ velocity vertical weight strength width