铜陵公铁两用长江大桥桁片式钢桁梁立体试拼装工艺  

Techniques for Trial Vertical Assembly of Steel Truss Girder of Tongling Changjiang River Rail-cum-Road Bridge

作　　者：邵天吉 余本俊[2] 

机构地区：[1]中铁山桥集团有限公司,河北秦皇岛066205 [2]中铁大桥局集团有限公司,湖北武汉430050

出　　处：《世界桥梁》2014年第6期31-35,共5页World Bridges

摘　　要：铜陵公铁两用长江大桥为五跨连续钢桁梁三索面斜拉桥,钢桁梁采用板桁结合形式,由3片主桁、上层正交异性公路板式桥面、下层正交异性铁路钢箱桥面及横联构成。钢桁梁采用整体焊接式桁片结构,每2个节间的主桁上、下弦杆,斜杆,竖杆通过整体节点焊接成桁片上桥安装。为验证制造工艺和精度并指导实桥施工,选取3.5个连续节间钢桁梁在工厂内一次完成立体试拼装。由于主桁桁片采用水平拼装制作工艺,采用800t龙门吊机2×200t吊钩提升加横移对桁片进行90°转体翻身后试拼装。试拼装过程中设置了抗推拉刚性斜撑增强桁片与铁路桥面的稳定性;在斜杆件加垫片,通过调整间隙控制桥梁预拱度。试拼装过程中设置了测量控制网,检测结果满足设计和验收标准,达到了立体试拼装目的。The Tongling Changjiang River RailcumRoad Bridge is a fivespan continuous steel truss girder cablestayed bridge with three cable planes .The steel truss girder is the combined orthotropic steel plates and steel trusses structure ,containing three main trusses ,the upper orthotropic steel plate deck for vehicles ,the lower orthotropic railway steel box deck and lateral bracings .The steel truss girder is a integrallywelded truss structure ,the upper and lower chords ,diagonal struts and vertical struts of the main trusses in every two blocks are welded by integral nodes to be truss block for assembling on the bridge .In order to verify the manufacturing technique and precision and to direct the construction of the real bridge ,the steel truss girder in 3 .5 continuous blocks were selected to conduct onetime trial vertical assembly in the factory .The main truss blocks were fabricated by the horizontal assembling technique ,the 800 t overhead lifting gantry with two lifting hooks of 200 t was adopted to lift and horizontally move the truss blocks and complete their 90°rotation and turning ,and then conduct the trial assembly .During the trial assembly ,the rigid diagonals resisting pushing and pulling forces were added to strengthen the stability of the truss blocks and the railway bridge deck .At the inclined members ,shims were wedged to control the precamber of bridge via adjusting the spacing .The survey control network was programmed as well during the assembling process ,the results of the inspection meet the design and acceptance standard ,achieving the goal of vertical assembly .

关 键 词：斜拉桥 公铁两用桥 钢桁梁 试拼装 整体焊接 转体翻身 抗推拉刚性斜撑 

分 类 号：U448.121[建筑科学—桥梁与隧道工程] U445[交通运输工程—道路与铁道工程]