跨新港四号路立交桥设计

Design of Grade Separation Bridge Overcrossing Xingang Road No.4

介绍津滨轻轨工程以斜交 19°跨越新港四号路立交桥的桥式方案比选、连续刚构桥的设计比选、设计对施工的考虑等内容。结论是 :快速轨道交通线路以斜交小夹角跨越城市道路时 ,将桥墩设在分隔带上 ,桥梁斜交正做 ,可减小桥梁跨度 ,简化桥梁设计 ;采用连续刚构方案 ,3个刚壁墩共同承受纵向水平力 ,可减小中主墩内力 ;在合龙段中施加顶力 ,可抵消混凝土收缩、徐变对刚壁墩产生的次内力 ,墩底约束按 2倍基础刚度取值 。

An introduction is given to bridge types and continuous rigid frame bridge alternatives for the grade separation bridge overcrossing Xingang Road No. 4 at an angle of 19°. Conclusion is: in the case that rapid rail overcrosses urban road at small oblique angle, to locate piers at lane separator and make the frame piers at right angle to the bridge may reduce bridge span and simplify bridge design; in the case of continuous rigid frame bridge, 3 rigidI-wall piers jointly bearing longitudinal horizontal force may reduce the internal force of middle main pier; applying jacking force to the closure section may counteract the secondary internal force on rigid--wall piers caused by concrete shrinkage and creep. Constraining force at the bottom of piers adopting 2 times foundation rigidity conformed to the actual forcing situation of the bridge.