摘要
广西柳州凤凰岭大桥为(96+124+3×130+90)m连续钢-混组合梁桥,主梁为等高双箱单室钢-混组合梁,由槽形钢箱梁和混凝土桥面板构成,梁宽46.6 m,该桥竖曲线由3段圆曲线和2段直线组成。钢梁采用连续步履式顶推、跨间不设临时墩的方案施工,最大顶推跨度达130 m。由于该桥竖曲线线形复杂、顶推悬臂长度较大、桥面板及体外预应力束施工工序繁杂,为确保施工中结构安全、成桥线形和内力满足设计要求,从线形控制、导梁过墩控制、桥面板安装控制等方面进行施工控制。钢梁顶推施工时,采用几何状态传递法对各梁段安装线形进行预测与控制,确保成桥线形满足设计要求;分析临时拉索张拉、环境温度改变与导梁前端位移响应关系,计算临时拉索张拉力,通过张拉临时拉索实现导梁顺利过墩;桥面板施工时,对皮尔格铺装法进行优化,改变桥面板安装顺序,确保了钢梁及桥面板应力满足要求,并缩短了工期。通过以上施工控制,该桥钢梁顺利顶推完成,全桥线形平顺,实测主梁线形满足设计要求,成桥状态良好。
The Fenghuangling Bridge in Liuzhou,Guangxi Province,is a continuous steel-concrete composite girder bridge with spans(96+124+3×130+90)m.The superstructure,measuring 46.6 m wide,consists of constant-depth single-cell steel trough girders that act compositely with the overlaid concrete slabs.The bridge is composed of three circular curved axes and two straight axes.The steel trough girders were incrementally launched,with a maximum launching distance of 130 m,and no temporary piers were added to assist the construction.The complex vertical curves of the bridge,long incremental launching distance,complicated construction procedures of concrete slabs and external prestressing tendons posed great challenges for the construction.To ensure the safety of the structure during construction,as well as the alignment and internal forces of the bridge after completion could meet the design requirements,the alignment,the launching nose needing crossing piers,and the concrete slab installation were all brought under control.During incremental launching,the geometric state transfer method was used to predict and control the installation alignment of the girder segments to ensure the completed alignment of the bridge.The displacement response of the end of the launching nose to the tensioning of the temporary stay cables as well as the ambient temperatures was analyzed.The launching nose was guided to cross the piers via tensioning temporary stays.The concrete slabs were placed following a modified Pilger process,to ensure the required stresses in the steel girders and concrete slabs and shorten the construction schedule.The measured alignment of the superstructure after completion meets the design requirements,and the completed bridge is sound.
作者
严和仲
李林辉
楚民红
YAN Hezhong;LI Linhui;CHU Minhong(China Railway Major Bridge Reconnaissance&Design Institute Co.,Ltd.,Wuhan 430056,China)
出处
《桥梁建设》
EI
CSCD
北大核心
2023年第S02期156-162,共7页
Bridge Construction
关键词
连续梁桥
钢-混组合梁
复杂竖曲线
步履式顶推
线形
导梁过墩
桥面板安装
施工控制
continuous girder bridge
steel-concrete composite girder
complex vertical curve
incremental launching
alignment
launching nose crossing pier
concrete slab placement
construction control
作者简介
严和仲,1984—,男,高级工程师,2007年毕业于黑龙江工程学院土木工程专业,工学学士。研究方向:桥梁施工与控制,E-mail:303124043@qq.com;李林辉,1998—,男,助理工程师,2019年毕业于西南交通大学土木工程专业,工学学士。研究方向:桥梁施工与控制,E-mail:2651315335@qq.com;楚民红,1989—,男,工程师,2014年毕业于江西理工大学测绘工程专业,工学学士。研究方向:桥梁施工与控制,E-mail:670925952@qq.com
