控制管槽开挖深度,传统作法是在管道沿线上每隔10m 或20m 的槽口上设置一个坡度板,用坡度板顶高程与槽底设计高程之差作为下返数来控制开挖深度和管线坡度,由于下返数往往非整数,而且各坡度板的下返数值都不同,一是深度和坡度不易保证;二是施工数据过多,不便操作;三是施工检查很不方便。可采用预先确定相同下返数的方法 To control the depth of trench excavation, the traditional practice is to set a gradient plate every 10m or 20m along the pipeline, and use the difference between the elevation of the slope plate and the design height of the bottom of the trench to control the excavation depth and pipeline Slope, because the number of return is often non-integer, and the return value of each slope board is different, first, the depth and slope are not easy to guarantee; second, too much construction data, inconvenient operation; Third, construction inspection is inconvenient. You can use a method that predetermines the same number of returns