曲线钢箱梁步履式顶推施工组织与实践

Organization and Practice of Incremental Launching Construction for Curved Steel Box Girders

摘要:

曲线钢箱梁顶推施工是跨线桥梁建设中的关键环节，尤其在小半径曲线段，其线形控制难度大、同步精度要求高，对工程的质量与安全具有决定性影响。现以扶余市公铁立交桥为背景，开展步履式顶推施工组织设计与实践研究。通过液压同步顶推与全过程监测，并结合顶推线形实时纠偏、顶推稳定性控制、跨铁路安全施工、温度控制与地基沉降防控等综合措施，形成一套高精度顶推施工方案。工程实践表明，该方案实现梁体轴线偏差3 mm、竖向偏差5 mm的高精度控制，显著缩短铁路封锁时间，提升施工效率，并节约工程成本约15%，为同类跨线桥梁施工提供可靠的技术借鉴与实践范例。

Abstract:

The incremental launching construction of curved steel box girders is a key link in the construction of overpass bridges. Especially in small-radius curve sections, its linear shape control is difficult and the synchronization accuracy requirements are high, which has a decisive impact on the quality and safety of the project. Taking the highway-railway overpass in Fuyu City as the background, the organizational design and practical implementation of incremental launching construction are studied. Through hydraulic synchronous incremental launching and full-process monitoring, combined with real-time alignment correction of incremental launching, stability control of incremental launching, safe construction across railways, temperature control, foundation settlement prevention and control and other comprehensive measures, a set of high-precision incremental launching construction scheme is formed. The engineering practice shows that this scheme can achieve the high-precision control with a girder axis deviation of 3 mm and a vertical deviation of 5 mm, which significantly reduces the railway closure time, enhances the construction efficiency, and saves the engineering cost about by 15%, providing a reliable technical reference and practical model for the construction of similar overpass bridges.