Many explosive slips according to helix fixed up the asphalt felt cylinder in water, the ends of explosive slips are located in the same horizontal plane, under synchro-detonated condition of explosive slips, the shock waves are engendered and reflected by the steel cylinder which is laid inside, then this reflected shock wave shall break off the certain point of adjacent explosive slip which is not detonated yet just now. so this adjacent explosive slip is detonation-out.
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