Method and apparatus for charging boreholes with explosives

F - Mech Eng,Light,Heat,Weapons – 42 – D

Patent

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F42D 1/10 (2006.01)

Patent

CA 2291670

A method and a device for charging boreholes (11) with explosives. One end of a charging hose (3) is introduced to a substantially predetermined distance from the bottom of the borehole. Subsequently, a pumpable explosive is pumped through the charging hose at a controlled rate and substantially simultaneously with the pumping of the explosive the charging hose is withdrawn from the borehole at a controlled rate. The explosive is caused to flow out from a nozzle (13), arranged on said end of the charging hose (3), in the form of a hollow cone (18) and at high pressure, so that the outflowing explosive is given increased viscosity and by virtue of the high outflow rate cohesively adheres to the entire cylinder-shaped wall portion (19) of the borehole (11), upon which the explosive impinges in connection with said outflowing. With the aid of a centring device (14), the nozzle (13) is centred in the borehole (11).

L'invention concerne un procédé et un dispositif permettant de charger des explosifs dans des trous de mines (11). Une extrémité d'une tuyauterie de ravitaillement (3) est introduite jusqu'à une distance sensiblement déterminée du fond du trou de mine. Ensuite, un explosif pompable est pompé par la tuyauterie de ravitaillement avec un débit contrôlé. Sensiblement simultanément au pompage de l'explosif, la tuyauterie de ravitaillement est retirée du trou de mine à une vitesse contrôlée. L'explosif est pulvérisé sous forme de cône creux (18) par une buse (13) placée sur l'extrémité de la tuyauterie de ravitaillement (3) et à haute pression, de telle manière que l'explosif pulvérisé ait une viscosité accrue et, par ce haut débit, adhère sans discontinuité sur toute la partie paroi cylindrique (19) du trou de mine (11), sur laquelle l'explosif est projeté avec ce haut débit. La buse (13) est centrée dans le trou de mine à l'aide d'un dispositif de centrage (14).

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