在混凝土桥梁平衡悬臂法施工过程中 ,最重要的一个方面是由倾覆引起失稳的极限状态。文中首先提出在这类桥梁施工中所包含的主要假设、荷载以及方法体系。基于可靠度的校准过程 ,就是确定一组分项安全系数 ,将其用在构件的设计中 ,以确保桥梁在施工过程中的稳定性。最后举例比较主跨为 12 0m桥梁在分别采用建议的分项安全系数和整体安全系数为 1.5时所使用的稳定构件的设计值 One of the most important aspects of the balanced bridge construction of concrete bridges is the limit state of instability caused by overturning. The paper first proposed the main assumptions, loads and methodologies involved in the construction of such bridges. Based on the reliability of the calibration process, is to determine a set of sub-items safety factor, which will be used in the design of components to ensure the stability of the bridge during construction. Finally, an example is given to compare the design values ​​of the stability members used when the main span is 12 0m bridge, respectively, when the proposed sub-item safety factor and the overall safety factor are 1.5