大型V构桥梁转体关键问题研究

Research on Key Problems of Large V-Structure Bridge Rotation

转体施工对跨越线路干扰少,是近年来桥梁工程领域热点问题。但该技术起步较晚,在结构施工控制、转体过程监控及后期姿态调整等方面仍存在不成熟之处,解决这些问题是保障桥梁结构安全与精准转体的关键。本文基于312国道苏州东段改扩建工程昆山段大型V构桥梁转体工程项目,针对转体桥梁施工控制、临时支撑拆除监测、称重试验、转体过程监控、桥梁姿态调整等转体施工全过程关键技术问题进行方法与试验研究。相关测试数据及结果分析表明:V型刚构桥梁称、配重之后具备较好整体平衡性,转体牵引全过程平稳,姿态调整后成桥状态位置与设计位置基本符合。本文研究方法及结论可为同类型桥梁转体施工、过程监控及姿态调整提供参考。

Turning construction has become a hot issue in bridge engineering field in recent years because of its advantages of low interference to crossing lines.On the other hand,the construction technology of rotating body started late,and there are still immature aspects in structural construction control,rotating process monitoring and posture adjustment.Solving these problems is the key to guarantee the safety and precision of rotating body.Based on the large V-structure bridge rotating project of Kunshan section of Suzhou Eastern section reconstruction and expansion project of National Highway 312,this paper conducts method and experimental research on key technical issues in the whole process of rotating bridge construction,such as construction control of the rotating bridge,temporary support removal monitoring,weighing test,monitoring of the rotating process,and bridge posture adjustment.The test data and result analysis show that the V-shaped rigid frame bridge has a good overall balance after weighing and balancing,the whole process of rotation and traction is stable,and the status position of the bridge is basically consistent with the designed position after posture adjustment.The methods and conclusions of this study can provide reference for the same type of bridge rotation construction,process monitoring and posture adjustment.