梅山春晓大桥下层纵移开启桥架设计

Design of Lower-deck Longitudinal Movable Bridge Frame for Meishan Chunxiao Bridge

宁波梅山大桥为主跨336 m的中承式双层钢桁拱桥,采用人车上下分离及下层纵移开启的结构设计,上层为六车道一级公路,下层为慢行通道。在跨中108 m范围内设置下层纵移桥架,桥架闭合时可满足游艇全天候通航要求,打开后可满足500 t级海轮通航要求。现介绍春晓大桥下层纵移开启桥架的主要设计要点,供同行参考。

Meishan Chunxiao Bridge of Ningbo is a half-through double-deck steel truss arch bridge with a main span 336 m.Its structural design is the upper-lower separation of mancar and the lower-deck longitudinal moving mode.Its upper deck is a six-lane Class I highway and its lower deck is a slow-traffic channel.The lower-deck longitudinal movable bridge frame is erected within the 108-m range of midspan.The bridge frame when closed can meet all-weather navigation requirements of yachts,and when opened can meet the navigation requirements of Class 500-t seagoing vessels.The main design essentials of lower-deck longitudinal movable bridge frame of Meishan Chunxiao Bridge are introduced.