地铁施工邻近桥梁安全风险管理研究

研究目的:地铁施工造成邻近建(构)筑物危害及其保护是一个重要问题。本文针对地铁施工对邻近桥梁的安全影响问题,分析地铁施工邻近桥梁安全风险管理流程,构建地铁施工邻近桥梁安全风险管理体系,为不同风险等级的邻近桥梁安全管理控制提供可靠依据。研究结论:结合桥梁基础的型式、深度及桥桩与地铁结构的空间位置关系等因素,将桥梁邻近等级划分为五个等级;根据桥梁下部和上部结构的现状外观、工作状态以及动力特性等进行检测和诊断,评估桥梁现状承载能力状况;基于桥梁与地铁结构的邻近等级划分、桥梁现状评估结果等因素,将地铁施工邻近桥梁的安全风险划分为"Ⅳ、Ⅲ、Ⅱ、Ⅰ"四个等级,采取相应风险等级的应对保护措施;在武汉地铁施工邻近现有轻轨桥的工程实例中取得良好效果。

Study on Safety Risk Management in Construction of Metro Adjacent to Bridge

Research purposes: The damage to the adjacent buildings caused by metro construction and its prevention attract more attention nowadays.Aiming at the impact of the metro construction on the adjacent bridge,this paper analyzes the safety risk management process in construction of metro adjacent to bridge and presents a complete set of the risk management system for providing the scientific and effective reference to the adjacent bridge with the different risk levels. Research conclusions:Taking the form and depth of the foundation and the relation between the bridge pile and the spatial location of metro into account,the adjacent grade of the bridge to metro can be divided into 5 levels.The present bearing capacity of the adjacent bridge can be assessed by checking and diagnosing the current appearance,working state and dynamics characteristics of the bridge structure.Based on both of the adjacent grade and reliability evaluation results,the safety risk of adjacent bridges to metro construction can be classified into the 4 levels: Ⅳ,Ⅲ,ⅡandⅠ.For the different safety risk levels,the corresponding measures should be taken.It has been applied in construction of the Wuhan metro adjacent to bridge,obtaining good result.