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甲、隧洞测中心线及检查断面一、一般测中心线及检查断面情况、存在问题隧洞开挖首先要有中心线及腰线（高程线），根据中心线来布眼、放炮，过去给中线是用经纬仪用红铅油划在洞顶及掌子面，或予先在洞顶设中心控制点（在洞顶凿一孔放入木桩钉），有支衬时可将中心钉设在横梁上，至少2个，间距约15公只左右，用小垂球法以目测三点成一直线，划在掌子面上，腰线是用水准仪以红铅油划在洞两侧或掌子面上，有支撑时
A, tunnel survey center line and inspection section I. General survey center line and inspection section situation, existing problems Tunnel excavation must first have a centerline and waistline (elevation line), according to the centerline to clothe, blasting, in the past to the midline It is to use the theodolite to use red lead oil to draw on the top of the hole and the face of the hand, or to set a central control point on the top of the hole (put a stake in the hole at the top of the hole). When there is a backing, the center pin can be set at On the crossbeam, at least 2, spaced about 15 km apart, using a small vertical ball method to visually measure three points in a straight line, on the face of the hand, the waistline is a level indicator with red lead oil on both sides of the hole or hand On the surface, when there is support