客运专线双线64m PRC简支梁节段预制3200t造桥机整孔架设施工技术

研究目的:为了研究大跨双线铁路64mPRC简支箱梁施工技术,研究钢桁架现浇挠度大和收缩徐变的影响,确保大跨混凝土简支梁成桥质量。研究结果:温福铁路白马河大桥双线64m简支混凝土箱梁,采用节段预制,3 200t造桥机整孔架设、现浇湿接缝和张拉控制达到了设计目的,控制了张拉时钢桁架梁对混凝土梁体反作用力的影响,成功实现了双线铁路大跨简支梁施工技术。

Construction Technology of Erecting the Unified Opening of 64m PRC Simple-supported Beam for Railway Passenger Dedicated Double Line with Segment Prefabrication and 3200t Bridge Girder Erecting Machine

Research purposes:The analyses of influences of big deflection caused by casting steel truss in place and the slow change of contraction are made for the purpose of doing researches on the construction technology for long span double line 64 m PRC simple-supported beam to ensure the bridging quality made up by long span concrete simple-supported beam. Research results:To the double line 64 m concrete simple-supported box beam of Baimahe Bridge on Wen- zhou-Fuzhou Railway Line,the expected goals are achieved through adopting the methods and technologies of segment prefabrication,erection of unified opening with 3 200 t bridge girder erecting machine,casting wet joints in place and control of tension.The construction technology for double railway line simple-supported beam can be applied successfully as long as the influence on the concrete beam body by the reacting force of steel truss is controlled well while tensioning.