摘要
徐盐高速铁路新洋港大桥采用(72+96+312+96+72)m双塔双索面钢桁梁斜拉桥,对大桥施工控制的原则、方法及监控监测手段进行了介绍。以无应力状态法基本原理为基础,对结构制造及安装线形、钢梁悬拼线形、斜拉索初张拉拔出量、二次调索等重难点问题进行了研究。结果表明:新洋港斜拉桥宜采用无应力状态法+几何补偿法确定构件的制造及安装线形,钢梁悬拼线形宜采用线形精确控制+索力近似控制的方式,采用零点索力法或等效弹性法可以对斜拉索初张拉进行有效控制,宜采用无应力状态法结合实际索力进行二次调索。根据研究成果对新洋港斜拉桥进行施工控制,监测结果表明结构的线形、内力状态均满足设计要求,提出了钢桁梁斜拉桥的设计优化建议。
Xinyanggang bridge on Xuzhou-Yancheng high speed railway adopts(72+96+312+96+72)m double pylons and double cable planes steel truss cable-stayed bridge.The principles,methods and monitoring means of bridge construction control were introduced.Based on the basic principle of stress-free state method,the key and difficult problems such as structural manufacturing and installation alignment,steel girder suspension alignment,cable initial tension pull-out length and secondary cable adjustment were studied.The results show that the stress-free state method+geometric compensation method should be used to determine the manufacturing and installation alignment of components of Xinyanggang cable-stayed bridge.The alignment precise control+approximate control of cable force should be used for the suspension alignment of steel girder.The zero-point cable force method or equivalent elasticity method can effectively control the initial tension of cables.The stress-free state method combined with the actual cable force should be used for secondary cable adjustment.According to the research results,the construction control of Xinyanggang cable-stayed bridge is carried out.The monitoring results show that the structural alignment and internal force state meet the design requirements,and the design optimization suggestions of steel truss cable-stayed bridge are put forward.
作者
李方柯
邹孔庆
王冰
LI Fangke;ZOU Kongqing;WANG Bing(China Railway Fifth Survey and Design Institute Group Co.Ltd.,Beijing 102600,China;Steel Structure Construction Co.Ltd.of China Tiesiju Civil Engineering Group,Hefei 230022,China)
出处
《铁道建筑》
北大核心
2021年第3期32-37,共6页
Railway Engineering
基金
中铁第五勘察设计院集团有限公司科技研发课题(T5Y2015-B05)。
关键词
铁路斜拉桥
钢桁梁
施工控制
设计优化
线形
初张拉
零点索力法
等效弹性法
railway cable-stayed bridge
steel truss girder
construction control
design optimization
alignment
initial tension
zero-point cable force method
equivalent elasticity method
