既有现浇箱梁悬臂拼宽加固改造技术研究

Research on Cantilever Split-width Reinforcement of Existing Cast-in-place Box Girder

为了满足现状交通导改需求,避免因桥梁拼宽改造封闭施工对现有交通的影响,东坑湾海槽大桥采用带“钢斜撑”的钢隔板形式进行箱梁悬臂拼宽改造。文中详细介绍了桥梁拼宽改造关键细部设计及相应施工的注意事项,通过建立有限元计算模型,验证拼宽改造结构受力的合理性,可为类似桥梁拼宽改造项目提供参考。

In order to meet the needs of current traffic guidance and reform and avoid the influence of closed construction due to bridge widening transformation on existing traffic, Dongkengwan trough bridge adopts the form of“steel diagonal brace” steel structure for box girder cantilever widening transformation. This paper introduces the key details of bridge widening reconstruction design and corresponding construction precautions. Through the establishment of finite element calculation model, the rationality of the stress of the widening reconstruction structure is verified, which can provide reference for similar bridge widening and reconstruction projects.