椒江特大桥主桥设计研究

椒江特大桥是杭州经绍兴至台州客运专线的控制工程,主桥采用(84+156+480+156+84)m钢桁斜拉桥,具备四线、宽桁、大跨、高速等特征。为保证该桥设计方案合理可行、经济美观,本文就该桥的桥梁结构型式、主梁结构类型、桥面系构造等进行综合比选。研究结果表明:(1)主跨采用480m1跨跨越习惯航迹线,满足通航、防洪要求和受力景观需要,减小船撞风险;(2)桥面布置采用四线双桁同层布置,优化线间距,节省引桥投资,减少建设规模;(3)桥面采用密横梁正交异性复合钢板桥面系,有效降低二恒大小,减小主桁宽度。

Research on Design of Main Bridge of Jiaojiang Long Span Bridge

Jiaojiang bridge is the key project of Hangzhou-Shaotai-Taizhou passenger dedicated line,(84+156+480+156+84)m steel truss cable-stayed bridge is used for the main bridge.This bridge contains characters such as four tracks,wide truss,long span and high speed. In order to ensure the project to be feasible,practical and economical,this paper conducts series of comparison and selection on structural style of the bridge,designs of the main girder and structure of the deck. Research conclusions show:(1)The main span using 480m span crossing the customary track line meets the requirements of navigation,flood control and the stressed landscape needs,and the risk of boat collision is reduced;(2)The layout of bridge deck is four line double truss and same layer arrangement,the line space is optimized,the approach bridge investment is saved,the scale of construction is reduced;(3)The dense cross beam orthotropic composite steel deck is adopted for bridge deck,the secondary dead load is effectively reduced,and the width of main truss is reduced.