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斜拉桥主塔索导管的安装定位是斜拉桥施工中的一个难点,其索导管的安装精度将直接影响到斜拉索的整个受力状态及桥梁整体合龙时的线形结构,从而影响到斜拉桥的正常使用寿命,结合四川省涪江五桥斜拉桥索导管施工测量控制实践,对索导管的安装测量高精度定位进行了分析研究,不同测量外部条件、不同精度的全站仪采用相对定位技术进行观测的误差大大降低,完全满足斜拉桥索导管定位精度要求,提高了定位效率、降低了观测成本,为类似工程提供参考。
The installation and positioning of the main cable duct of cable-stayed bridge is a difficult point in the construction of cable-stayed bridge. The installation accuracy of cable duct will directly affect the whole stress state of the stay-cable and the linear structure when the bridge is completely closed, thus affecting The normal service life of the cable-stayed bridge, combined with the practice of cable duct construction control survey of the fifth-suspension cable-stayed bridge of Fujiang River in Sichuan Province, the high-precision positioning of cable duct installation and measurement was analyzed. Different total external conditions, The error of observing using relative positioning technology is greatly reduced, which fully meets the requirements of positioning accuracy of cable duct of cable-stayed bridge, improves positioning efficiency, reduces observation cost and provides reference for similar projects.