大跨度组合梁斜拉桥中跨合龙技术  

Mid-span Closure Techniques for Long-spanComposite Girder Cable-stayed Bridge

作　　者：孔艺达 郑万山[2] KONG Yida;ZHENG Wanshan(Chongqing Architectural Design Institute Co.,Ltd.,Chongqing 400015;China Merchants Chongqing Communication Technology Research&Design Institute Co.,Ltd.,Chongqing 400067)

机构地区：[1]重庆市设计院有限公司,重庆400015 [2]招商局重庆交通科研设计院有限公司,重庆400067

出　　处：《公路交通技术》2023年第6期43-47,56,共6页Technology of Highway and Transport

基　　金：国家重点研发计划项目(2020YFF0217801);重庆市技术创新与应用发展专项重点项目(cstc2019jscx-fxydX0038)。

摘　　要：为保证双河特大桥中跨顺利合龙、减少合龙施工措施,对中跨合龙方案进行了分析和优化,根据现场条件,双河特大桥采用了温度配切合龙方案,对合龙温差和优化方案建立有限元模型进行计算分析。结果表明:1)合龙温差在5℃以内时,不会影响结构安全,优化后的合龙方案减小了混凝土板的拉应力,使得组合梁机构受力更为合理;2)温度配切合龙方案在环境气温稳定、合龙口姿态测试数据详实的条件下能保证大桥中跨的顺利合龙。In order to ensure the mid-span closure of Shuanghe bridge,and reducing closure construction measures,the closure schemes were analyzed and optimized.According to the on-site conditions,the Shuanghe bridge adopted a temperature matching and cutting scheme,and analysis was conducted on the temperature difference and the optimization scheme.The results show that when the temperature difference of the closure is within 5℃,it will not affect the structural safety.The optimized closure scheme reduces the tensile stress of the concrete slab.The temperature matching and cutting scheme can ensure the closure of the middle span of the bridge under the condition of stable ambient temperature and detailed closure posture test data.

关 键 词：斜拉桥 组合梁 合龙 温度配切 施工技术 

分 类 号：U455.4[建筑科学—桥梁与隧道工程]