刚构连续梁高温合龙处理措施与体会

研究目的：天津铁路枢纽南仓特大桥38 m＋62 m＋38 m刚构连续梁是在正常的合龙温度下进行设计的,但由于拆迁等特殊情况的影响,本桥主跨合龙进入夏季,高温合龙不可避免.针对本桥介绍一下高温合龙的特殊处理措施和体会,给相关结构设计、施工提供一些借鉴和帮助. 研究方法：结合该桥合龙时所处的温度环境,针对高温合龙方案进行经济技术比较,采用结构分析计算与现场实测相结合的方法进行研究. 研究结果：针对高温合龙提出一套成功的施工经验与针对性的技术措施. 研究结论：搭棚冰块降温与在中跨合龙段施加顶力的组合方案是一个典型的高温合龙的处理范例.该方案操作可行、效果良好,适合于中小跨度桥梁,但对于大跨度桥梁结构工作面较大的情况,应慎重选择.

Treatment Measures and Experience in Making High Temperature Closure of Rigid Framed Continuous Girders

Research purposes: The 38 m 62 m 38 m rigid framed continuous girders of Nan Cang extra-long bridge of Tianjin railway terminal was designed for the closure under normal temperature.However,due to the impacts of the special conditions of removal and resettlement work,the main span closure of the bridge was delayed until summer,making high temperature closure inevitable.Based the this bridge,this paper briefly introduced some treatment(measures) for and personal experience in bridge closure under high temperatures for the purpose of providing certain(reference) and help to similar structural design and construction.Research methods:Combined with the temperature environment when the closure of the bridge was made,a(techno-economic) analysis was performed based on the high temperature closure scheme.And the study was conducted by using the method of structural analysis and calculation in combination with field survey.Research results:This paper suggested a whole set of successful construction experience and technical measures based on the high temperature closure.Research conclusions:The combined scheme of temperature drop by shed-kept ice blocks and the application of(jacking) force to the mid-span closure section is a good example of treatment.This scheme is feasible in operation with good results and suitable for medium and minor span bridges,but should be carefully used for large span bridge(structures) attributable to the comparatively large working face.