某铁路架梁会车平台稳定性分析

Stability Analysis of a Railway Beam Assembly Platform

摘要: 为保障高铁桥梁架设过程中的作业安全，本文以新建某铁路标段架梁会车平台为研究对象，针对运梁车行进过程中的受荷稳定性问题，基于设计与施工资料，建立三维有限元数值模型，对桥墩、挡墙及其与回填体之间的协同作用机制进行系统分析。通过设置四种典型不利工况，模拟运梁车及预压箱梁荷载作用，提取平台结构关键部位的位移变化和应力响应。分析结果表明：受预压箱梁和重载运梁车共同作用，320墩在最不利工况下的竖向沉降达11.00  mm，顺桥向最大水平偏移量达6.00  mm，承受的最大主压应力为14.24  MPa；挡墙与桥墩连接处为应力集中区，320墩侧挡墙最大Von Mises应力达2.30  MPa，接近材料强度极限。由于墩身、挡墙与填料之间存在显著刚度差异，连接区域的受力不均加剧，应作为设计与施工中的重点控制部位。研究成果可为类似工程中会车平台结构设计优化与施工安全控制提供理论支撑与实践依据。

Abstract: In order to ensure the safety of operations during the construction of high-speed railway bridges, this paper takes the newly built railway section’s beam assembly platform as the research object. Based on design and construction data, a three-dimensional finite element numerical model is established to systematically analyze the collaborative mechanism between bridge piers, retaining walls, and backfill materials in response to the stability of the load during the operation of the beam transport vehicle. By setting up four typical unfavorable working conditions, simulating the load effects of beam transport vehicles and preloaded box girders, the displacement changes and stress responses of key parts of the platform structure are extracted. The analysis results show that under the combined action of preloaded box girders and heavy-duty beam transport vehicles, the vertical settlement of 320 piers under the most unfavorable conditions reaches 11.00 mm, the maximum horizontal displacement along the bridge direction reaches 6.00 mm, and the maximum principal compressive stress borne is 14.24 MPa. The connection between the retaining wall and the bridge pier is a stress concentration zone, and the maximum Von Mises stress of the retaining wall on the 320 pier side reaches 2.30 MPa, approaching the material strength limit. Due to significant stiffness differences between the pier body, retaining wall, and filling material, the uneven stress in the connection area is exacerbated, and it should be a key control area in design and construction. The research results can provide theoretical support and practical basis for the optimization of assembly platform structure design and construction safety control in similar projects.