苏通大桥主桥上部结构施工及控制技术研究

苏通大桥是目前世界上已建成的最大跨径斜拉桥,其主桥上部结构施工,主要包括边跨辅助跨以及索塔区大块梁段安装,标准梁段安装以及中跨合龙几个阶段.其中大块梁段采用浮吊整体吊装,标准梁段采用桥面双吊机系统进行吊装,中跨合龙采取顶推辅助合龙方法.同时在施工过程中采用了全过程自适应几何控制方法,通过全过程精确控制结构构件的无应力尺寸与形状,以及实现控制系统和被控制系统相适应来达到控制桥梁结构最终线形和内力的目标.为了解决长悬臂主梁风致振动条件下的测量问题,采用了包括基于GPs和基于全站仪的两种动态几何监测系统.对上部结构施工期风致振动进行了深入研究,对最大单、双悬臂状态进行了抖振响应分析,对最大单悬臂状态的主梁抗风安全性进行了分析评估,并提出了相应的抗风措施.成桥状态几何线形误差和索力误差均在设计范嗣之内.

Sutong Bridge--construction and control technology of the superstructure

Sutong Yangtze Highway Bridge is the longest span cable-stayed bridge completed in the world nowadays.The construction of superstructure of the main bridge was composed of several stages including erection of big block girders for side span,assistant span and tower area,erection of standard girders and middle span closure.The big block girders were hoisted as integer by floating crane.The standard girders were hoisted by double cranes system at the deck.Pushing assistant method was adopted in middle span cl...