杨房沟水电站导流隧洞工程施工测量

Construction survey of diversion tunnel of Yangfanggou Hydropower Station

以杨房沟水电站导流洞工程为实例,对该导流洞施工控制测量、施工放样测量、内业处理及工程量计算等施工测量技术进行了详细介绍、提出利用地面高精度控制点在洞壁上补设低一级的控制点,结合边角后方交会测量方法,应用洞内相对坐标系统开展洞内直线段测量。该测量方式在保证隧洞现场放样和断面验收精度符合要求的同时提高了工作效率,对类似水电站洞室施工测量工作具有一定参考价值。

Taking the diversion tunnel construction of Yangfanggou Hydropower Station as an example, construction survey techniques including control survey, lofting measurement, indoor work and engineering quantity calculation are introduced in detail. It is proposed that one - level lower control points could be set on the tunnel wall by using high - accuracy control points on the ground, and the measurement inside the straight tunnel was carried out by using in - tunnel relative coordinate system combined with side - angle resection measurement. The proposed measurement method ensured that the accuracy of in - situ lofting and cross - section measurement met the check acceptance requirements and at the same time improved the work efficiency, which could provide reference for construction survey of similar diversion tunnels.