EXTRA-THICK COAL SEAM UPPER LAYER OLD GOAF ROOF RECONSTRUCTION METHOD AND CONSTRUCTION METHOD

Disclosed is an extra-thick coal seam upper layer old goaf roof reconstruction method. The method comprises: step 1, providing roadway filling holes (2), wherein the roadway filling holes are provided along a center line of the extension of a roadway (1) with a spacing of 80-100 m therebetween, and the distance between the roadway filling holes and an end of the roadway is not larger than 20 m, and after drilling of the roadway filling holes, the roadway filling holes are filled, and the filling comprises aggregate pouring and grouting; and step 2, providing goaf filling holes, wherein the goaf filling holes are provided at intervals in a row as a unit in a manner in which holes of adjacent rows are staggered with a spacing of 40-60 m between the holes, and a spacing of 20-30 m between rows, and a row of goaf filling holes are filled after being drilled, and the filling comprises aggregate pouring and grouting. Further disclosed is an extra-thick coal seam upper layer old goaf roof reconstruction construction