重庆朝天门长江大桥扣索施工工艺

重庆朝天门长江大桥主桥为三跨连续中承式钢桁系杆拱桥。主桥钢桁梁采用悬臂架设,中跨主拱采用架设扣塔安装。其扣索采用高强度、低松弛钢绞线,单根穿挂、单根张拉工艺施工。扣索的施工主要包括施工准备工作、钢绞线下料、施工平台搭设、固定端穿索、张拉端穿索、张拉、索箍和减振器安装、扣索拆除等工序。采用MIDAS/Civil有限元软件中的空间梁单元、索单元、桁架单元建立空间杆系模型,对扣索的各根钢绞线张拉力精确计算,所有钢绞线逐根一次张拉到设计值,所有扣索最后无须调索。

Construction Technology of Fastening Stays Used for Chaotianmen Changjiang River Bridge in Chongqing

The main bridge of Chaotianmen Changjiang River Bridge in Chongqing is a 3-span half-through continuous steel truss tied arch bridge.The steel truss girder of the bridge was erected by the cantilever method and the truss arch over the central span was erected in the aid of the fastening stay tower.The fastening stays of the tower were made up of the high-strength and low-relaxation steel wire strands,and were installed by the construction technology of threading and tensioning of the wire strands in each in...