FIELD: blasting operations.
SUBSTANCE: borehole charge generation includes placing of explosive in well in the form of independent sections separated by gaps, installation of primer and triggering devices and stemming of the upper part of well with inert material. Blocks with foamed polyurethane solution or foamed polyurethane plugs are placed in well between independent parts of explosive. Blocks with foamed polyurethane solution are placed at ambient temperature above +5°C whereas foamed polyurethane plugs are placed at ambient temperature under +5°C. Foamed polyurethane is used in proportion of component volumes: polyol: isocyanate - 1:1.4÷1.5. Plugs from inert foaming material are formed on surface.
EFFECT: invention improves effectiveness of blasting operations due to maximum use of explosion power.
5 cl, 1 ex
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