中承式系杆拱桥施工控制关键技术

Key Technologies for Construction Control of Half-through Tied Arch Bridge

大跨系杆拱桥施工复杂,为保证结构成桥状态满足设计要求,需要对施工全过程进行施工控制。文章以沈阳动漫桥为工程背景,采用有限元软件Midas Civil建立空间模型,分析了顶推力及对拉力对拱梁区结构线形和受力的影响,确定了合适的顶推参数;对于高而薄且侧向刚度较小的吊杆横梁,分析了施工过程中的稳定问题,并采用设置平联等措施保证T形吊杆横梁在施工过程中的稳定性;对于双吊杆结构,分析了后期恒载引起的横向双吊杆索力误差,并对定位标高进行修正以控制成桥索力和标高。结果表明:对于本桥关键施工工序进行施工控制,各项指标均满足设计要求,控制效果良好,可为同类工程提供参考。

The construction of long-span tied arch bridges is complicated. In order to ensure that the structure of the bridge meets the design requirements,construction control is required for the entire construction process. In this paper,taken Dongman Bridge in Shengyang as the engineering background,the general finite element software Midas Civil is used to establish a spatial model to analyze the effects of the jacking force and the pulling force on the structural alignment and force of the arch beam area,and the appropriate jacking parameters are determined. Suspension member transversal girder with small lateral rigidity is analyzed for stability problems during construction,and the stability of the T-shaped boom beam is ensured by the measures such as setting the flat joint. For the double boom structure,lateral double boom cable force error caused by late dead load is analyzed,and the cable tension and elevation is controlled by correcting the positioning elevation. The analysis results show that all indicators in the construction control of the key construction procedures of the bridge meet the design requirements and the control effect is good. The key technologies can be used as references for similar engineering.