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钻孔超线
为确保隧道的设计断面,并为下一步的钻孔作业创造条件,沿开挖轮廓线钻凿的周边炮孔,其钻孔方向应略向外侧偏斜,使孔底处于设计轮廓线外的钻孔方法。在这种情况下,不易掌握周边炮孔的平行钻孔精度,所以操作时要特别仔细
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