REPAIR METHOD OF EXISTING WATER SHIELDING SHEET AND WATER SHIELDING SHEET FOR INTERMEDIATE JOINING

摘要

PROBLEM TO BE SOLVED: To provide a repair method of an existing water shielding sheet for joining a polyethylene water shielding sheet to an existing vinyl chloride water shielding sheet, and a water shielding sheet for intermediate joining used therefor.SOLUTION: The repair method of the existing water shielding sheet includes steps of: making an existing water shielding sheet SS remain at a part of natural ground G and removing it; press-fixing and joining, to an end edge of the existing water shielding sheet SS, an end edge 22 of a first water shielding sheet of a water shielding sheet 10 for intermediate joining for which end edges of a vinyl chloride first water shielding sheet 20 and a polyethylene second water shielding sheet 30 are formed into an overlapping junction and a silicone sheet 50 covering a required range including the end edge of one of the water shielding sheets exposed at the overlapping junction is bonded; and laying a polyethylene water shielding sheet PS for repair onto the natural ground G by press-fixing and joining the end edge of the polyethylene water shielding sheet SS for the repair to an end edge 32 of the second water shielding sheet of the water shielding sheet 10 for the intermediate joining.