大跨钢箱梁上跨既有线辅助措施关键技术研究

Research on key technology of auxiliary measures for long span steel box girder crossing existing line

以青岛市新机场高速连接线(双埠—夏庄段)工程主线上跨既有铁路线钢箱梁转体桥为工程背景,研究了临时索塔对大跨度T构转体时梁端下挠的改善和对梁高的优化,为铁路净空受限的项目提供一种方法,也为临时索塔的施工提供参考依据。

Taking the steel box girder swivel bridge which is part of Qingdao new airport high-speed connecting line(Shuangbu-Xiazhuang section)project spans the existing railway line as the engineering background,this paper studies the improvement of the beam end deflection and the optimization of the beam height when the large-span T-frame is rotated with the help of the temporary cable tower.And it provides a method for the project with limited railway clearance and a reference for the construction of the temporary cable tower.