30m预制T梁临时支座设计对比与应用

DESIGN COMPARISON AND APPLICATION OF 30 M PREFABRICATED T-BEAM TEMPORARY SUPPORT

曲靖三宝至昆明清水高速公路(曲靖段)土建2标预制T梁采用架桥机架梁施工,施工方法为简支体系转换连续体系,转换过程中临时支座的稳定性和合理性是施工关键,通过计算对比分析确定全线采用砂筒作为临时支座,实践证明砂筒式临时支座是最优的临时支座方案。

The prefabricated T-beam of No.2 civil engineering bid section of Qujing Sanbao to Kunming Qingshui Expressway(Qujing section)is constructed by erecting bridge frame beam.The construction method is simple support system conversion continuous system.The stability and rationality of temporary support in the conversion process is the key to this construction process.Through calculation and comparative analysis,sand cylinder is used as temporary support in the whole line.It is proved by practice that the sand cylinder temporary support is the most important one in this project,the temporary bearing scheme is preferred.