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嘉绍大桥主航道桥几何合龙控制

, PP. 87-93

Keywords: 桥梁工程,多塔斜拉桥,几何合龙控制,成桥线形误差分析,顶推力

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Abstract:

嘉绍大桥主航道桥是世界上首座六塔、双幅、空间四索面斜拉桥,全桥共有7个合龙口,合龙方案复杂。针对传统温度合龙工艺所存在的问题,基于几何控制法理论,首先给出了一种新的合龙工艺———几何合龙;其次介绍了合龙口姿态调整的计算方法及主航道桥选择几何合龙的原因;最后介绍了几何合龙工艺在嘉绍大桥实施时的操作要点。几何合龙技术可消除合龙时的温度附加效应,保证既定的合龙时间。实测数据表明采用几何合龙方式的嘉绍大桥主航道桥合龙后主梁线形平顺,误差较小,施工控制工作取得了较好的成果。

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