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特大跨径三塔悬索桥首次运用塔梁固结体系,即钢箱梁在中塔位置设计为塔梁固结结构,体系转换施工时存在钢箱梁弯曲应力及扭转剪应力较大、中塔顶主缆的不平衡水平力较大的情况。为了解决上述问题,优化钢箱梁吊装及合龙顺序对整体结构受力的影响、索鞍顶推对塔柱的影响,明确塔梁固结前后施工流程、全过程线形监控措施等,结合马鞍山长江公路大桥左汊三塔悬索桥塔梁固结施工实践,对钢箱梁施工进行了详细的介绍说明,并总结出各施工工序的精细化措施,保证了大桥钢箱梁的顺利合龙和桥面线形的平顺性要求。
For the first time, the tower girder consolidation system is used for the super large-span three-tower suspension bridge, that is, the steel box girder is designed as the tower-girder consolidation structure in the mid-tower. The bending stress and torsional shear stress of the steel box girder are large during conversion. The unbalanced level of force larger situation. In order to solve the above problems, the influence of hoisting and closing sequence of steel box girders on the force of the whole structure, the influence of cable saddle pushing on tower pillars, the construction flow before and after consolidation of tower girder and the linear monitoring measures during the whole process are optimized. The construction of the tower girder of the suspension bridge of the left bridge and the tower of the third bridge of the highway bridge has been carried out. The construction of the steel box girder has been described in detail. The refinement measures of each construction procedure have been summarized to ensure the smooth closure of the steel box girder The ride comfort requirements.