地铁上方大跨径、变宽钢箱梁节段拼装施工关键技术

Key Technologies for Segmental Assembly Construction of Long-span Variable-width Steel Box Girders above Metro Lines

摘要:

金海路（杨高中路—华东路东侧）改建工程2标工程涉及一座大跨径、变宽钢箱梁桥的施工。该桥梁横跨复杂的城市地理条件及轨道交通设施，施工难度高。工程中最具挑战性的是最大跨径达121 m、宽度由25 m急剧扩展至54 m的钢箱梁的节段拼装和吊装施工。为应对这一挑战，通过精细化模拟和多项创新技术的应用，成功解决了施工过程中的结构稳定性、吊装精度和安全性问题。首先，利用BIM技术和有限元分析法，对钢箱梁的拼装过程进行三维建模与模拟，优化吊装顺序和受力分析，确保拼装过程的精确性与稳定性；其次，采用SPMT短驳模块车组、计算机控制液压同步提升装置等先进施工设备，提高施工效率和安全性；最后，结合智慧监测技术，实现对施工全过程的实时监控与精细化管理。工程的顺利推进，为同类工程的施工提供了技术参考和实践经验。

Abstract:

The Section 2 of the Jinhai Road (Yanggongzhong Road ~ East Side of Huadong Road) Reconstruction Project involves the construction of a long-span variable-width steel box girder bridge. This bridge spans the complex urban geographical conditions and rail transit facilities, making the construction challenging. The most challenging part of the project is the segmental assembly and hoisting construction of the steel box girder with the maximum span reaching 121 m and the width expanding from 25 m to 54 m sharply. To address this challenge, through refined simulation and the application of multiple innovative technologies, the problems of structural stability, hoisting accuracy and safety during the construction process are successfully solved. Firstly, by using BIM technology and finite element analysis, the assembly process of the steel box girder is modeled and simulated in three dimensions to optimize the hoisting sequence and force analysis, which ensures the accuracy and stability of the assembly process. Secondly, the advanced construction equipment such as SPMT short-distance shuttle module vehicle sets and computer-controlled hydraulic synchronous lifting devices are adopted to improve the construction efficiency and safety. Finally, combined with smart monitoring technology, the real-time monitoring and refined management of the entire construction process are achieved. The smooth progress of this project provides the technical references and practical experience for the construction of similar projects.