丁字口无测量仪器定测量线的变向方法

MINING & PROCESSING EQUIPMENT(2008)

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Abstract
在巷道掘进时,经常会遇到这种情况(见图1):已知AC为已掘巷道,方位角为αAB,点C为巷道中点,BD为未掘巷道,方位角为αBD;当掘进到B点时.就要开始变向掘进巷道BD,而此时要进行变向,就需要一个基准线,如果没有测量仪器定的基准线该如何操作?
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