大跨度连续钢桁架拱桥半悬臂拼装临时墩合理标高计算

The Calculation of Temporary Pier Elevation of Long-span Steel Trussed Arch Bridges with Semi-cantilever

当大跨度连续钢桁架拱桥采用支架法施工时,其临时支墩标高的合理设定对大桥的拼装线形和安全顺利拼装具有重要影响。本文结合钢桁梁桥的制造线形和架设过程中的钢梁线形变化,较系统地研究了临时墩的标高计算,推导了实用的计算公式,并将该法应用于某大跨度钢桁梁柔性拱组合结构桥梁,由现场拼装和拆除结果表明本文考虑预留50mm的设置方法,能更方便临时墩拆除,同时验证了本文方法的合理性和可靠性,从而为类似桥梁施工计算提供借鉴。

The temporary pier elevation has significant influence on construction line and safety of long-span steel trussed arch bridges with semi-cantilever. The temporary pier elevation was studied systematically by the paper, and the practical function was deduced. Then, the calculation method was applied to one long-span steel trussed arch bridge. The obtained result presents that 50mm preserving consid- ered by the paper method is reasonable and reliable ,which can provide convenience for removing the temporary pier.