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渠道纵断面测量的任务是测出中心线上各里程桩和加桩的地面高程,並绘出纵断面图;横断面测量的任务是按各中心桩测出垂直于渠线方向的地面坡度变化处的高程,並绘出横断面图,以供渠道设计和计算土方之用。一、纵断面测量的外业纵断面测量是以沿线测设的高程控制点(三、四等水准点)为依据,用水准测量的方法从一个控制点开始引测,测出一段渠线上各中心桩的地面高程后,附合到下一个控制点进行校核,其闭合差不得大于
The task of channel vertical section measurement is to measure the ground elevation of each mileage pile and pile in the center line and to draw a vertical section view. The task of cross section measurement is to measure the slope change of the ground perpendicular to the canal line according to each central pile Elevation and draw a cross-sectional view for the channel design and calculation earthwork purposes. First, the vertical section measurement of the vertical section measurement is based on measuring the height of the control points set (three, four and other level points) as the basis, the level measurement method from a control point to start the test to measure a canal line After the ground elevation of each center pile, attached to the next control point for checking, the closing difference shall not be greater than