在役公铁桁架桥梁加宽改建结构安全与线形监测技术研究

以松浦大桥改建为背景,分析了桁架梁桥改建的施工监控特点,建立了老桥施工监控以结构安全控制为主,新、旧结构的适配性控制为辅的总体控制思路,研究了相应的监测与控制方法.针对支座更换施工阶段,对支座反力和主桁架动力特性进行识别,并与理论计算结果进行对比,验证与评估结构总体的技术状况.此外,开发应用了基于“互联网+”的监控数据与信息交互平台工作模式,为国内外同类桥梁的施工监控提供理论参考依据与借鉴.

Studies on Structure Safety and Alignment Monitoring Technique of Widening and Reconstruction of In-service Rail-cum-Road Truss Bridge

The construction monitoring characteristics of truss beam bridge reconstruction are analyzed by taking the reconstruction of Songpu Bridge as the background. The overall control idea of the construction monitoring of old bridge mainly based on the safety control of structure and supplemented by the adaptive control of new and old structures is established to study the relevant monitoring and control methods. Regarding the construction phase of the support replacement, the reaction force of the support and the dynamic characteristics of the main truss are identified, and are compared with the theoretical calculation results to verify and evaluate the overall technical status of structure. In addition, the working mode of monitoring data and information interaction platform based on "Internet+" is developed and applied, which provides the theoretical referring basis for the construction monitoring of the similar bridges at home and abroad.