Annular decoupling device for deep hole presplitting blasting

The invention discloses a circumferential decoupling device for deep hole presplitting blasting, and relates to the technical field of geotechnical engineering blasting. The device comprises explosives, a circular ring type air spacer, a detonator (detonating cord), an energy gathering cavity and a plug. During blasting operation, the circular ring type air spacer wraps the periphery of the explosive column at intervals, the circular ring type air spacer is fixed after being inflated to enable the explosive to be located in the center of a blast hole, and the pre-splitting blasting charging structure is obtained. The device does not need to be fixed by bamboo canes and the like. The bottom end of the explosive is provided with the energy-gathering cavity, detonation waves can be gathered in the axis direction, energy-gathering flow is formed, and the local damage effect of the energy-gathering cavity end is enhanced. The pre-splitting blasting charging structure is simple to manufacture, and the annular air s