州河特大桥合龙方案改变可行性分析研究

Analysis of Closure Scheme Change for Zhou River Bridge

连续刚构桥合龙方案的选择决定了桥梁结构的内力及线形,州河大桥为满足施工工期的要求,在原有设计基础上,改变合龙顺序,对比分析得出合龙过程最佳顶推力,同时,对运营3年后成桥结构是否满足设计要求进行验算.结果表明:在合理顶推力作用下,施工过程中对结构预拱度值进行局部调整能够准确满足在施工及成桥状态下线形及应力设计要求,为类似桥梁施工提供一定的借鉴.

The different closure program of continuous rigid frame bridge determines the structure＇s internal force and linear.To meet the requirements of the construction period for Zhou River Bridge,the closure program has been changed.The original closure program is analysed to contrast to the last closure program for figuring out the best jacking force.At the same time,the bridge after operation for three years has been analysed to check the carrying capacity.The result showed that partial adjustment of pre-camber of bridge in construction period can accurately satisfy linear and stress design requirements in construction and bridge under the reasonable horizontal jacking force.It＇s providing a reference for a similar bridge construction.