首都水厂铁矿石为磁铁矿石,一般f=8～12,由于有大块矿石,影响铲装作业时间.采用常规爆破,飞石远,达不到安全要求,故改用水封爆破.首先,用浅孔凿岩机在大块中心打一个深为大块厚度1/2的炮孔,然后将2号岩石炸药和毫秒导爆管装入乳胶防水套.把口扎紧,加工成药包,放入炮孔底部.为防止炮孔灌水后药包上浮,将导爆管打一个活结再放入孔内或者在孔口用石块将导爆管轻轻地压住,使药包固 The iron ore of Capital Waterworks is magnetite ore, generally f = 8-12, because of large ore, affecting shovel operation time.Using conventional blasting, flying stone far, not up to the safety requirements, so the switch to the water seal blasting. First, use a shallow hole rock drill to hit a center hole in the center of a large thickness of 1/2 of the hole, and then No. 2 rock explosives and millisecond detonating tube into the waterproof casing. Tighten the mouth, processed into kits, Into the hole at the bottom of the gun.In order to prevent the gun bag floating up after irrigation, the detonator to play a living knot and then placed in the hole or hole in the stone with a detonating tube gently pressed, so that the drug package