40m铁路简支箱梁运架过程支承梁体安全性分析

Safety Analysis for Support Girder During Transport and Erection of 40 m Simply Supported Box Girder of Railway

在高墩、复杂地质条件下的铁路桥梁建设中,规模化地应用预制架设方法施工的40m预应力混凝土简支标准梁能显著减少基础工程造价,具有重要的经济价值。然而,其运架过程的安全性尚待评估。本文以新建郑州至济南高速铁路工程为依托,对运架40m铁路简支箱梁通过(40+64+40)m混凝土支承梁体时的安全性进行分析。采用MidasFEA等有限元软件对运架过程中(40+64+40)m连续梁整体和局部应力进行详细的计算分析,并对运架设备的支腿布置提出建议和要求,研究成果可为同类工程提供借鉴。

In the erection of railway bridges characterized by high piers and complex geological conditions,40 m prestressed concrete simply supported standard girder constructed by large-scale application of precast erection method can significantly reduce the construction cost of foundation and has important economic value.However,the safety of transport and erection remains to be assessed.Based on the case of new Zhengzhou-Jinan High-speed Railway,this paper analyzes the safety of transport and erection of 40 m simply supported box girders of railway through(40+64+40)m concrete support girders.Detailed calculation and analysis of the overall and local stresses of(40+64+40)m continuous girder during transport and erection were carried out using finite element software such as Midas FEA,and recommendations and requirements were put forward for the leg arrangement of the transport and erection equipment.The study results can provide a reference for similar projects.