镇雄三孔景观桥拱架水袋预压施工技术

Water Bag Preloading Construction Technology of Arch Frame of Zhenxiong Three Holes Landscape Bridge

云南镇雄县南部新区新型城镇化综合建设项目三孔景观桥主拱圈设计跨径115 m,采用悬拼拱架现浇法施工,拱架采用水袋法进行预压。通过水袋预压,有效地检验了钢拱架拼装质量及承载能力,确保施工过程中钢拱架的安全性,同时消除了拱架的非弹性形变,并获取了拱架的弹性形变值,确保混凝土箱拱成形后的线形与质量。实践证明,水袋预压施工技术是一种高效、经济、节能环保的现浇支架预压施工技术,在我国类似工程中具有较强的借鉴、推广价值。

The design span of the main arch ring of the three holes landscape bridge of the new urbanization comprehensive construction project in the southern New Area of Zhenxiong County,Yunnan Province is 115 m,which is constructed by the cast-in-situ method of suspended arch frame,and the arch frame is preloaded by water bag method.Through water bag preloading,the assembly quality and bearing capacity of steel arch frame are effectively tested to ensure the safety of steel arch frame in the construction process.At the same time,the inelastic deformation of arch frame is eliminated,and the elastic deformation value of arch frame is obtained to ensure the linearity and quality of concrete box arch after forming.The practice proves that the water bag preloading construction technology is an efficient,economic,energy-saving and environmental protection in-situ support preloading construction technology,which has strong reference and promotion value in similar projects in China.