Ammunition and explosive-charge making – Loading fireworks and bursting charges – Placing – tamping – or priming charge in blast hole
Patent
1996-03-22
1996-12-17
Nelson, Peter A.
Ammunition and explosive-charge making
Loading fireworks and bursting charges
Placing, tamping, or priming charge in blast hole
102312, 102313, F42B 300
Patent
active
055842224
ABSTRACT:
A method for charging explosives in substantially horizontal bore-holes, with a loading density reduced in relation to that corresponding to the complete fill up of the bore-hole diameter with the explosive in bulk form, comprising that a charging hose with an end opening is introduced into at least one bore-hole of a blasting round, that a pumpable and coherent bulk explosive is pumped through the charging hose at a controlled rate, that simultaneous with the pumping of explosive the hose is withdrawn at a controlled rate, that the pumping and withdrawal rates are adjusted to form a coherent string exiting from the hose end opening, said exiting string only partially filling up the bore-hole diameter. An apparatus for charging explosives in bore-holes in controlled volume amount per bore-hole length unit comprises, a vessel (31) containing a pumpable and coherent bulk explosive (32), a charging hose (45) adapted for insertion into the hole-hole, a conduit (38) connecting the vessel with the hose, pumping means (33,34) for moving the explosive from the vessel through the conduit and the hose at a controlled rate, hose moving means (44,48) allowing forward movement of the hose and withdrawal of the hose at a controlled rate and adjusting means (34,48) for setting the ratio between the pumping rate and the hose withdrawal rate.
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Engsbraten, New Blasting Method For Horizontal Holes Underground, World Mining Congress, 1994, pp. 655 et seg.
Engsbr.ang.ten Bjorn
Magnusson Rolf
Nelson Peter A.
Nitro Nobel AB
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