METHOD FOR EXTINGUISHING UNDERGROUND FIRES Russian patent published in 1995 - IPC

FIELD: mining. SUBSTANCE: method for extinguishing underground fires includes, first, drilling holes from the surface down to permeable overlying the fire-affected beds, injection of heat-resistant grouting mortar to produce gas-impermeable isolating screen overlapping in plan the entire area of fire-affected district. Then, extreme holes around the fire-affected district are deepened down to worked out or caved zones of bed, and holes are cased with casings having one-sided perforation directed towards fire seat. Injected under pressure grouting mortar forms shutoff circular curtain round the entire fire-affected district. EFFECT: higher efficiency in fire extinguishing and reduced costs for its execution. 2 dwg