FIELD: mines, particularly means to prevent dust-laden air-gas explosions in goaf and adjoining mine excavations.
SUBSTANCE: method involves periodically supplying foam in goaf behind powered support to create isolating strips. Isolating strips are made of construction foam based on liquid pre-polymer with propellant to create hard polyurethane. Initial construction foam pouring height is equal to half of excavated seam thickness m. Minimal isolating strip width Ls is equal to excavated seam thickness.
EFFECT: increased mechanical strength of isolating foam strips, decreased labor inputs for isolating strip creation, increased simplicity and improved mining safety.
1 dwg
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