METHOD FOR LAYING IMPERVIOUS LAYER, IMPERVIOUS LAYER, DEVICE FOR LAYING IMPERVIOUS LAYER AND DEVICE FOR LAYING IMPERVIOUS LAYER

摘要

PROBLEM TO BE SOLVED: To obtain a method for laying impervious layers capable of efficiently laying planar drain sheet materials and impervious sheets, the impervious layers and a device for laying the impervious layers. SOLUTION: This method for laying the impervious layers comprises a planar drain sheet material 20 laying stage for rotatably hanging the rolled planar drain sheet materials 20 on hangers 24 and laying these materials in parallel on the sections laid with the impervious layers while allowing a laying work car 11 to travel, a impervious sheet laying stage for rotatably hanging the rolled impervious sheets on the hangers 24 in a manner as to position the connecting parts of the planar drain sheet materials 20 in the sections exclusive of both side parts and laying the impervious sheets in a manner as to superpose the ends on each other while allowing the car to travel without trampling the planar drain sheet materials 20 and a fixing stage for fixing the superposed parts of the impervious sheets to a sealing state by using welding machines on tacky adhesive tapes.