海珠桥悬吊体系拆除施工工艺研究

Study of Demolition Technology for Suspension System of Haizhu Bridge

为保证广州海珠桥悬吊体系拆除施工的安全,运用有限元仿真建模方法对该桥各拆除工况进行验算分析,并对其受力状态进行跟踪观测,提出先卸载桥面及附属结构荷载后再拆除悬吊体系的拆除原则以及吊杆与背索交替对称进行的拆除方法。由现场跟踪监测及分析结果可知,在悬索体系拆除时,钢梁应力变化和变形情况、桥塔偏位等与理论计算结果基本吻合,均在控制范围内。该桥整个拆除过程安全、高效且对环境影响较小。

In order to ensure the demolition safety of the suspension system of Haizhu Bridge in Guangzhou, the finite element method was used to carry out checking analysis of various demolition load cases, and the associated load bearing condition of the bridge during the demolition was traced and observed on site. The demolition principle of unloading the bridge deck and the subsid- iary structures first and demolishing the suspension system later and the method of alternate and symmetrical demolishing of hangers and the back stay cables were proposed. The on-site follow- up observation and analysis results indicated that when the suspension system was being demolished, the stress variation and deformation of the steel girder and the tower offsetting all agreed with the calculated results and were within the controllable range. The whole demolishing process of the bridge was safe, efficient and friendly to the environment.