S20外环高速泰和路高架桥整体换梁关键问题研究

Analysis on Key Issues of Integrated Beam Replacement of Taihe Road Elevated Bridge in S20 Outer Ring Expressway

摘要:

泰和路高架桥位于S20外环高速北段，根据近年桥梁检测成果，空心板梁存在较大安全隐患。为确保桥梁结构安全，计划利用S20外环隧道全封闭施工窗口期对泰和路高架桥进行修复。根据桥检报告及现场情况调研，开展病害成因及规律分析，最终确定上部结构整体更换的修复方案，为国内少见的整体换梁案例。工程边界条件复杂，工期紧张，设计、施工、交通组织及BIM方面均进行了精心策划，工程实施效果良好。总结工程实施过程中的关键问题，可为类似项目提供参考。

Abstract:

The Taihe Road Elevated Bridge is located in the north section of the S20 Outer Ring Expressway. Based on the bridge inspection results in recent years, there are the significant safety hazards in its hollow slab beams. In order to ensure the structure safety of the bridge, it is planned to carry out the repair of the Taihe Road Elevated Bridge during the fully enclosed construction window period of the S20 Outer Ring Tunnel. Based on the bridge inspection report and on-site situation investigation, the causes and patterns of the diseases are analyzed. Finally, the repair scheme for the integrated replacement of the superstructure is determined, which is a rare case of integrated beam replacement in China. The engineering boundary conditions are complex and the construction period is limited. The meticulous planning is carried out in terms of design, construction, traffic organization and BIM. The effects of engineering implementation are good. The key issues in the engineering implementing process are summarized, which can be referenced for the similar projects.