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桥梁结构设计时,参数的选取、施工状况的确定和结构分析模型等诸多因素的影响,以及混凝土材料的非均匀性和不稳定性,大跨度预应力混凝土连续梁、T型刚构、连续刚构等梁桥施工过程中结构的实际状态与设计状态很难完全吻合。因此在桥梁施工过程中,必须对施工预拱度、主梁梁体内的应力等进行严格的施工控制。分析了大跨度连续梁桥施工控制的方法、对箱形截面的温度场进行了观测,并用观测结果剔除温度对施工控制的影响。同时还提出了大跨度预应力混凝土桥梁施工应力监测的一些具体概念,并分析了在监测中应注意的一些相关问题。
Bridge structure design, parameter selection, construction status determination and structural analysis model and many other factors, as well as the heterogeneity and instability of concrete materials, long-span prestressed concrete continuous beams, T-shaped rigid frame, continuous Structural beam bridge construction process in the actual state of the design and design is difficult to completely match. Therefore, in the process of bridge construction, it is necessary to strictly control the construction camber, the stress in the main girder and so on. The method of construction control of long-span continuous girder bridge is analyzed. The temperature field of box-section is observed and the effect of temperature on construction control is eliminated by observation results. At the same time, some concrete conceptions of construction stress monitoring of long-span prestressed concrete bridges are also proposed, and some related problems to be noticed in monitoring are analyzed.