横琴二桥主桥钢桁拱架设施工关键技术

发布时间：2018-02-27 07:14

本文关键词： 拱桥钢桁拱斜拉扣挂悬臂法体系转换线形控制合龙钢梁安装桥梁施工　出处：《桥梁建设》2016年06期 　论文类型：期刊论文

【摘要】：珠海横琴二桥主桥为主跨400m的三跨连续中承式钢桁系杆拱桥,边跨钢桁梁采用架梁吊机悬臂法吊装,中跨钢桁拱采用斜拉扣挂悬臂法、先拱后梁法架设。施工中对结构体系进行多次转换,并在边、中支点设置了三向调位装置,以确保施工过程中结构受力满足要求;斜拉扣挂系统扣锚索张拉采用"等值法"控制索力,以确保索力的均匀性;中跨主拱合龙采用预偏位移补偿+顶落梁法,避免了复杂调索和整体大吨位移梁施工;刚性系杆合龙采用限位中支座法,避免了架设临时系杆,合龙方便快捷;采取了栓孔重合度控制、拱度控制、轴线偏差控制等线形控制措施,以确保拼装拱度和轴线满足要求。实践表明,该桥施工采取的关键技术有效解决了一系列施工难题、确保了大桥施工安全、缩短工期和节约成本。
[Abstract]:The main bridge of Hengqin No. 2 Bridge in Zhuhai is a three-span continuous through steel truss arch bridge with a main span of 400m. The side span steel truss beam is hoisted by the cantilever method of beam crane, and the mid-span steel truss arch adopts the method of cable-stayed buckling and hanging cantilever. During the construction, the structure system is changed many times, and the three-way adjusting device is set up at the side and middle fulcrum to ensure that the structural force can meet the requirements in the construction process. In order to ensure the uniformity of the cable force, the cable tension in the cable tension system is controlled by "equivalent method" to ensure the uniformity of the cable force, and the pre-offset displacement compensation method is used in the closing of the middle span arch to avoid the complex cable adjustment and the construction of the whole large-tonnage moving beam. The rigid tie bar closure adopts the method of limited middle support, which avoids the temporary tie bar erection and is convenient and quick to close, and adopts linear control measures such as bolting hole coincidence control, arch control, axis deviation control and so on. Practice shows that the key technology adopted in the construction of the bridge effectively solves a series of construction problems, ensures the construction safety of the bridge, shortens the construction period and saves the cost.
【作者单位】：中交第二航务工程局有限公司;长大桥梁建设施工技术交通行业重点实验室;公路长大桥建设国家工程研究中心;
【分类号】：U445.4

【相似文献】