One-time blasting demolition device for elevator shaft outside dam body

A one-time blasting demolition device for an elevator shaft outside a dam body is characterized in that a blast hole perpendicular to the bottom is formed in the surface of the elevator shaft, and thehole diameter d of the blast hole ranges from 75 mm to 100 mm; wherein the hole depth H1 is equal to H + h, H is the actual height of the elevator shaft outside the dam body, the blast hole ultra-deep h, the connecting position of the elevator shaft outside the dam body and the dam body is 12 rows of blast holes, when D2 is smaller than or equal to 0.6 m, arrangement of blast holes is not considered, D2 is larger than 0.6 m and smaller than or equal to 2.5 m, and 11 blast holes are drilled in the center of the wall; the explosive column is composed of an explosive cartridge, a fixing piece and a detonator, the explosive cartridge and the detonator are fixed to the fixing piece, the detonator and the middle explosive cartridge are fixed at equal intervals at the upper end and the lower end, the detonator is in com