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用吊罐法掘进天井,当凿岩装药作业结束时,要将吊罐下放到下部中段,将重锤、通讯电缆提到上部中段,移动绞车之后再通知下部中段的爆破工进行点火起爆。但是由于通讯电缆上提,上下联系不便,特别是在高天井作业时,这个“通知”难以下达。1980年初,我矿三坑口掘进一个高80米的通风天井。这么高的天井再用喊话联系是行不通的,敷设专用电话线路需6000多米,不仅麻烦,而且费用太高。于是,我们采用了乒乓球联系法:当上部中
When the drilling operation is completed, the hanging pot shall be lowered into the middle of the lower part, the weight and telecommunication cables shall be raised to the middle of the upper part, and after the winch is moved, the blasting workers in the lower part shall be informed of the ignition initiation. However, due to the communication cable, up and down the inconvenience, especially in the high-pit operation, this “notice” is difficult to release. In early 1980, I mined a pit of 80 meters high ventilation patio pit. It is not feasible for such a high patio to use propaganda links. It takes more than 6,000 meters to lay a dedicated telephone line, which is not only troublesome but also costly. So, we used the ping pong contact method: when in the upper part