The invention relates to a goaf foam fixed-point
injection air leakage stoppage device and method, the air leakage stoppage device comprises two foam generating devices and a foam injection
pipe, the two foam generating devices are arranged in an air inlet roadway and an air return roadway respectively and connected with forepoling hydraulic supports in the air inlet roadway and the air return roadway, and the foam injection
pipe is connected with the forepoling hydraulic supports in the air inlet roadway and the air return roadway. The forepoling hydraulic support can drive the foam generating device to move forwards;
coal wall
pipe grooves extending in the front-back direction are formed in the protective
coal pillars on the left side and the right side of the goaf, foam injection pipes are laid in the
coal wall pipe grooves, the output end of the foam generation device communicates with the ends, away from the goaf, of the foam injection pipes, and a plurality of foam release openings are formed in the foam injection pipes at equal intervals in the length direction; and an old channel can be automatically closed and a new
injection point can be opened along with collapse of overlying strata. According to the air leakage stoppage device, the foam injection pipe is laid on the coal wall of the protection
coal pillar, the construction cost is low, the air leakage stoppage device cannot be crushed by fallen rocks, and meanwhile, the released foam can effectively block an air leakage channel in a triangular area.