METHOD FOR CHARGING OF BOREHOLES WITH RUNNING WATER (MODIFICATIONS) Russian patent published in 2001 - IPC

FIELD: methods for charging of boreholes for blasting operations. SUBSTANCE: the method for charging of borehole with running water by nonwaterproof explosive consists in the following: sealing of borehole mouth, dipping of hose of film material with a weight at the end in the borehole, feed of it with gas under pressure exceeding the hydrostatic pressure of water column in the borehole and displacement of water from it. The upper end of the hose is fitted on a funnel, gas under pressure is fed to the hose, the hose is expanded pressed to the borehole surface, water from the borehole is displaced to the mass, gas pressure in the hose is reduced to the atmospheric one, and the hose is filled by a nonwaterproof explosive. At a charge of a borehole with an intensive water inflow the upper end of the hose is connected to the body of a drum feeder and squeezed in the borehole mouth by the body, gas under pressure is fed to the hose, and without reducing the gas pressure in the hose, it is filled by an explosive by the drum feeder, which at the same time serves as a gas seal creating a high pressure in the hose . When the water level in the borehole exceeds 1/3 of its depth, the lower end of the hose is connected to the end of an elastic and flexible support in the form of a rod or band, the obtained assembly is dipped in the borehole. The hose end is pressed by the end of the elastic support to the borehole face, the upper hose end is connected to the body of the drum feeder, and gas under pressure is fed to the hose, and without reducing the gas pressure in the hose, the hose is filled by an explosive to a height equal to or exceeding the water level in the mass. The flexible support is removed from the borehole, applying it on the drum, charging of the borehole by the drum feeder is continued. EFFECT: intensified displacement of water from the borehole to the mass and prevented contact of nonwaterproof explosive with water. 4 cl, 6 dwg