大跨度钢桁拱桥吊索塔架施工技术  

Construction Technology of Fastening Stay Tower of Long⁃span Steel Truss Arch Bridge

作　　者：齐东建 QI Dongjian(Railway Engineering Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院集团有限公司铁道建筑研究所,北京100081

出　　处：《铁道建筑》2022年第4期90-93,115,共5页Railway Engineering

摘　　要：以明珠湾大桥为背景,研究了百米级吊索塔架在大跨度钢桁拱桥施工中的应用,详细介绍了塔架结构组成、拼接工艺以及内力传递原理。施工中通过采用3D激光扫描技术实现吊索塔架拼装过程线形的实时测控,保证了吊索塔架拼装精度,满足了拼装需求;设置三层风缆,保证台风期吊索塔架的安全性,并通过张拉风缆在拼装过程中调整塔架垂直度;设置三层斜拉索,实现斜拉扣挂法悬臂安装主跨钢梁。通过有限元数值模拟及实体仿真计算分析表明:在最不利荷载条件下,吊索塔架整体强度、刚度均满足规范要求。With the Mingzhu bay bridge as the background,the application of 100-meter-level sling tower in the construction of long-span steel truss arch bridge was studied,and the structure,splicing process and internal force transmission principle of the tower were introduced in details.During the construction,the 3D laser scanning technology was used to realize the real-time measurement and control of the alignment of the fastening stay tower assembly process,which ensures the assembly accuracy and meets the assembly requirements.Three layers of wind cables are set up to ensure the safety of the fastening stay tower during typhoon periods,and the verticality of the tower can be adjusted during the assembly process by tensioning the wind cables.At the same time,three layers of cables are set up to realize the cantilever installation of the main span steel beam with the cable-stay buckle hanging method.Through the finite element numerical simulation with solid elements,it is shown that under the most unfavorable load condition,the overall strength and stiffness of the fastening stay tower meet the requirements of the specification.

关 键 词：明珠湾大桥 钢桁拱桥 吊索塔架 3D扫描技术 仿真计算分析 

分 类 号：U445.466[建筑科学—桥梁与隧道工程]