深中通道中山大桥超宽钢箱梁悬臂拼装横向变形分析及对策措施

Transverse Deformation and Countermeasures of Cantilever Assembly of Super-Wide Steel Box Girder of Zhongshan Bridge over Shenzhen-Zhongshan Link

针对斜拉桥超宽幅钢箱悬臂拼装过程中存在横向变形问题,该文根据深中通道中山大桥双向八车道超宽钢箱梁施工特点,分析超宽钢箱梁悬拼安装过程中横向变形产生的主要原因,结合目前国内外宽幅箱梁悬拼施工中匹配高差调整工艺,创新性地提出“一字梁锁定+挂索初张拉匹配”工艺,较好地解决了中山大桥超宽钢箱梁悬臂拼装横向变形差问题。

In view of the transverse deformation of super-wide steel box girders of cable-stayed bridges during the cantilever assembly,the construction characteristics of the two-way eight-lane super-wide steel box girder of Zhongshan Bridge over Shenzhen-Zhongshan Link were analyzed,and the main causes of the transverse deformation during the cantilever assembly of the super-wide steel box girder were investigated.According to the matching height difference adjustment technology in the cantilever assembly construction of the wide box girder in China and abroad,this paper innovatively proposed a matching process of straight beam locking+initial tension of hanging cables,which better solved the problem of poor transverse deformation during the cantilever assembly of the super-wide steel box girder of Zhongshan Bridge.