厦深铁路榕江特大桥主桥连续钢桁梁柔性拱施工关键技术  

Key Construction Techniques for Continuous Steel Truss Girder and Flexible Arch of Main Bridge of Rongjiang River Bridge on Xiamen-Shenzhen Railway

作　　者：鄢怀斌 周云 李慧明 

机构地区：[1]中铁科工集团有限公司,湖北武汉430066

出　　处：《世界桥梁》2014年第4期6-9,共4页World Bridges

摘　　要：厦深铁路榕江特大桥主桥为(110+220+220+110)m连续钢桁梁柔性拱桥。主桥钢梁由连续钢桁梁、V形加劲弦钢梁和柔性拱钢梁三部分组成,连续钢桁梁为N形结构,其正交异性整体钢桥面板顶面与下弦杆顶面平齐;柔性拱钢梁由箱形拱肋、吊杆和平联组成,拱肋按二次抛物线布置。针对主桥钢梁结构复杂、连续钢桁梁与柔性拱合龙难度大等技术难题,制定了将连续钢桁梁与柔性拱分层架设、分次合龙的架设方案,先施工连续钢桁梁,再施工柔性拱钢梁。连续钢桁梁用4台全回转架梁起重机,分4个架梁作业面进行架设,分别在两主跨的跨中进行合龙;2个柔性拱钢梁用2台全回转架梁起重机分别从2个柔性拱的外则向主桥中间架设,在主桥中墩处进行对接合龙。The main bridge of Rongjiang River Bridge on Xiamen-Shenzhen Railway is a contin-uous steel truss girder and flexible arch bridge with span arrangement of （110＋220＋220＋110） m .The steel girder of the main bridge is made up of the continuous steel truss girder ,the steel girder with V-shaped stiffening chords and the flexible arch steel structure .The continuous steel truss girder is an N-shaped structure and the top of its overall orthotropic steel bridge deck is flush with the top of the lower chords .The flexible arch steel structure consists of arch ribs ,hangers and lateral bracings and the arch ribs stretch along a parabolic line .The steel girder structure of the main bridge is complex and the closure of the continuous steel truss girder and the flexible arch exhibits great challenge .Due to these problems ,the scheme of making the erection of the continu-ous steel truss girder and the flexible arch on different levels and adopting the phased closure was formulated ,by which the construction of the continuous steel truss girder would be conducted pri-or to that of the flexible arch steel structure .The continuous steel truss girder was erected by four slewing derrick cranes and on four operation platforms ,and closed at the midspan of the two main spans .The flexible arch steel structure was erected by two slewing derrick cranes following the se-quence of from the outer edge of the two flexible arch ribs to the center of the main bridge ,and closed by way of butt joint at the intermediate pier of the main bridge .

关 键 词：铁路桥 连续钢桁梁 双柔性拱 分层架设 分次合龙 起重机 桥梁施工 

分 类 号：U448.22[建筑科学—桥梁与隧道工程] U445.4[交通运输工程—道路与铁道工程]