内河航道受限空间下钢桁梁桥顶推施工关键技术研究

Research on Key Technologies for Incremental Launching Construction of Steel Truss Girder Bridge in Confined Spaces of Inland Waterways

摘要:

为解决受限空间下碍航桥梁改造难题，打通水陆交通堵点。结合上跨太仓杨林塘航道沪宜高速（S48）上关键节点工程苏昆太高速公路桥改建工程，分析总结了复杂受限空间下跨航高速公路钢桁梁桥分节段步履式顶推施工关键技术和工艺，同时根据受力复杂的水中临时支架及最不利工况下钢桁梁的受力和稳定性计算结果，验证了方案的合理性，并通过施工监控数据及实施效果进一步验证了方案的可行性，为今后城建交通受限空间下桥梁及线路改造提供了参考。

Abstract:

To address the challenges of reconstructing the bridge impeding navigation in confined spaces, the bottlenecks in water and land transportation are eliminated. In combination with the reconstruction project of the Suzhou-Kunming-Taiyuan Expressway Bridge as a key node project on the Shanghai-Yichang Expressway (S48) crossing the Yanglintang Channel in Taicang, the key technologies and processes for segmental step-by-step incremental launching construction of steel truss girder bridges in complex confined spaces are analyzed and summarized. At the same time, based on the calculation results of the force and stability of the steel truss girder under the most unfavorable constructing conditions and the temporary support in the water with complex forces, the rationality of the scheme is verified. The feasibility of the scheme is further verified through the construction monitoring data and implementation effects, providing a reference for the reconstruction of bridges and lines in confined spaces of urban construction traffic in the future.