钢筋混凝土箱形拱桥现浇施工分环方案比较

Comparision of Plans by Rings for in Place Casting Box Arch Bridge of Reinforced Concrete

混凝土箱型拱桥在无支墩拱式拱架上现浇施工时,若跨度较大,拱圈一般采用分环分段的施工方法。采用该方法施工时,已形成的拱环与拱架的横向联合作用明显。通过对比分析,采用一个最优分环方案,可以利用已形成的拱环与拱架在横向的联合作用,增加横向刚度,有利于提高施工过程中的横向稳定性。

When concrete box arch bridge is cast in place on the centering without buttress, if the span is bigger, the ring course usually adopts the construction methods by ring and segmentation. During construction by present method, the formed lateral combined action of arch ring with centering is evident. By analysis of contrast, it known that utilizing the combined action of already formed arch ring with centering in lateral direction could add the lateral rigidity which is favourable to increasing the lateral stability in the process of construction.