连续刚构桥主梁线形施工控制因素分析

Analysis of the controlling factor on the line shape of the continuous rigidfram bridge

连续刚构桥主梁悬臂施工节段较多、工期较长,主梁线形受多种因素影响,容易出现较大的悬臂标高误差,甚至出现两相对悬臂端标高相对误差太大,造成合龙困难的情况。如果为保证线形而采取强迫合龙,必将在结构中产生不利的附加内力,影响结构受力安全,所以对主梁线形控制的影响因素进行全面分析,确保成桥线形和内力状态符合设计与规范要求显得非常重要。

The cantilever construction for a continuous rigid frame bridge has more segments with long time and more stages.The main bridge line shape always is affected by many factors with large cantilever elevation error,or even elevations relative error of two cantilever end is too large,resulting in closure of a difficult situation.If taken to ensure line shape to close with force,will inevitably increase adverse and additional stress in the structure,and affect the mechanical safety of structure.The influencing factors on the line shape of bridge were analyzed in this paper to ensure that line shape and internal force state compliance with design and specification.