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一座桥梁施工时,需要施工放样与复核检测,平面与高程精度要求严格。不仅如此,在施工的设计图上给出的数据往往是整体性的,如坡度、节点标高(设计系统高程)、距离等,而具体放样点的坐标需要自己细化换算。在一座约100 m跨度的桥梁中,第一跨经过一条小河,且小河与桥纵向成一定的角度(非垂直),第二座桥墩平行于小河。桥墩在桥下坡,这样就形成了双向坡度。这种情况下,施工容易引起标高差错,造成不必要的损失。为应对这一问题,本文总结出较为完整有效的解决方案。
Construction of a bridge, the need for construction stakeout and inspection, plane and elevation accuracy requirements. Not only that, the data given in the design of the construction is often a whole, such as the slope, node elevation (design system elevation), distance, etc., and the coordinates of the specific stakeout points need to refine their own conversion. In a bridge spanning about 100 m, the first span crosses a stream that runs at an angle (not vertical) to the longitudinal axis of the bridge. The second pier is parallel to the stream. Pier in the bridge downhill, thus forming a two-way slope. In this case, the construction easily lead to elevation error, resulting in unnecessary losses. In response to this problem, this article summarizes a more complete and effective solution.