【摘要】 地下贯通工程的控制测量导线多为加测陀螺方位角的导线，本文讨论了地下贯通工程导线加测陀螺边的个数、位置，以及提高其可靠性、经济性的有关问题更多还原

【Abstract】 In most underground joint up projects,the gyro controlled traverse is used.The paper discusses the total number of the gyro side and their positions used in the joint up project.And it also deals with their reliabilities,economic value and practicabilities.更多还原