The invention relates to a down
coal face goaf water dredging structure. The structure includes a
fish scale net covering a collapsed top plate, after top plate
gangue collapses, a goaf is no longer filled freely, and the
fish scale net is used for covering to achieve the effects of protecting the top plate and catching the
gangue; a nog shaped like a Chinese character 'Jing' is erected below the collapsed top plate and used for supporting the collapsed top plate; a water-
retaining wall is built at the lower side of the nog shaped like a Chinese character 'Jing', and the goaf and the water-
retaining wall are used for building a weir to form a water
sump. The structure further includes a
water discharge pipe, the water-
retaining wall is provided with at least one
water discharge pipe to connect space outside the water-retaining wall and the water
sump. The invention further provides a down
coal face goaf water dredging method. The down
coal face goaf water dredging structure has the advantages that water dredging is conducted from a source, water and coal are separated, water blasting of a tunnel is avoided, and the production security hidden danger is eliminated; the discharged water is few in
impurity, damage to a drainage
system is reduced, and the
electric charge is saved; the dredging project is reduced, manpower is reduced, and the work efficiency is improved; the
operating environment is purified, and the production efficiency and the quality
standardization level are improved.