悬臂浇筑连续梁合龙方式的优化调整

On the Optimization and Adjustment of the Closure Ways for Cantilever-Cast Continuous Beams

水阳江特大桥跨水电站库区连续梁施工中为减少水中搭设膺架体系的不利影响,通过设计方案优化,减小边跨现浇段长度、调整梁体合龙顺序。对优化方案进行有限元建模仿真,计算分析各工况下梁体的应力、变形情况及最不利工况所在的施工阶段,对桥梁施工过程中的几个不利阶段采取了相应的施工控制措施。成桥结果显示该连续梁在施工过程中的各个阶段控制良好,合龙偏差及梁体线形均满足规范要求。

In the course of the construction of the continuous beams of the Shuiyangjiang River Mega Bridge crossing the reser-voir district of the water power station, the unfavorable effects of building scaffolding systems in water are decreased by optimi-zing the original design scheme, reducing the length of the site-cast section of the side span and adjusting the closure sequence of the beam bodies. The optimized-scheme-related beam bodies are modeled and simulated with the help of the finite element a- nalysis software, with the stress and the deformation circumstances of the beam bodies in various construction conditions, and the construction stages in the most unfavorable construction conditions calculated and analyzed,upon the basis of which the corresponding control measures are taken for the stages in unfavorable construction conditions in the course of the bridge con-struction. The result of bridge formation shows that the continuous beam is well controlled at various stages of the bridge con-struction, and both the closure error and the alignment of the beam body are found up to requirements of the Technical Specifications.