为了加速平巷的掘进,使所打巷道早日投入生产,地下巷道經常需要对向貫通。一般設計的方法是先规定了貫通的允许偏差,然后规定各项測量的方法及精度要求,根据地面与地下控制图形进行誤差予計,这会使某几項測量精度规定得过高,而另一些又规定得过低,以致返工浪費。为了使各項測量工作的精度要求更合理,各項操作规定得更适当,采用反算法来設計。反算的計算过程是: In order to speed up the roadway heading, the hit roadway as soon as possible into production, often require underground tunnel through. The general design method is to prescribe the allowable deviation through, and then provides the measurement methods and accuracy requirements, according to the ground and underground control graphics error is expected, which will make certain measurement accuracy is too high, and the other Some of them are too low to be reworked. In order to make the requirements of the accuracy of the measurement more reasonable, the operation rules are more appropriate, the use of anti-algorithm to design. The calculation of the inverse calculation is: