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在露天矿的钻孔过程中,当遇到矿岩较破碎时,卡钻情况时有发生。有时,通过多种方法仍不能取出,只好反转钻杆,丢弃冲击器。爆破时,由于应力波的作用,冲击器多被破坏报废。实践证明,若采用一定的保护措施,冲击器往往还能回收使用。根据我矿的实际情况,我们采取的保护措施是:在废孔的侧前方另钻一孔(尺寸见图1,单位米),之后,往废孔中填渣把孔填满。这样,爆破时应力波对冲击器的影响就大为减小了。若冲击器在台高中部以上,只要保证另钻孔的装药高度在冲击器下水平,冲击器回
In the open-pit mine drilling process, when the rock is more broken, the stuck situation occurs. At times, it is still not possible to remove it by any number of methods. Instead, the drill pipe is reversed and the impactor discarded. Blasting, due to the role of stress waves, the impactor is destroyed and scrapped. Practice has proved that if the use of certain protective measures, the impactor can often be recycled. According to the actual situation in our mine, we take the protective measures: drill another hole in the side of the waste hole (the size is shown in Fig. 1, unit: m), and fill the hole with the waste hole to fill the hole. In this way, the impact of stress waves on the impactor during blasting is greatly reduced. If the striker above the middle of Taiwan, as long as the other to ensure that the drilling height of the charge under the impact of the device, the impact of the back