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利用经纬仪在地面定向,通过两个瞄准器控制井内楔子方位,进行分枝孔钻进.共施工47个灌浆孔,取得了较好效果.
Using the theodolite to orientate on the ground and controlling the position of the wedge in the well through two sights, the branch holes were drilled. A total of 47 grouting holes were constructed and good results were obtained.