摘要
长寿长江二桥地处三峡库区V型河谷处,水流湍急、航道狭窄,传统钢箱梁吊装工艺无法满足现场实际需求。为了保证施工顺利进行,依托Midas有限元分析软件平台,建立长寿长江二桥悬索桥模型,针对对称与非对称吊装工艺下结构响应结果进行对比分析,探讨实际施工中采用的主梁不对称架设方式的合理性。研究结果表明:两种方案下主索鞍与成桥位置的里程差接近,竖向压力值、主缆平切角变化趋势基本一致;吊装前期索夹两侧主缆折角较大,最大值均为3.7°,后期逐步减小;主缆高程整体变化趋势相同且钢箱梁吊装完成后的主缆高程一致,对于钢箱梁后期焊接工作无影响。两种方案下结构计算结果基本一致,说明了不对称吊装方案的可行性,同时此方案大大加快了施工工期,节约项目支出成本。
The Changshou Yangtze River Second Bridge is located in the V-shaped valley of the Three Gorges Reservoir.The water flow is turbulent and the channel is narrow.The traditional steel box girder hoisting technology cannot meet the actual needs of the site.In order to ensure the smooth progress of the construction,this paper relies on the Midas finite element analysis software platform to establish the Changshou Yangtze River Second Suspension Bridge model,compares and analyzes the structural response results under symmetric and asymmetric hoisting techniques,and discusses the reasonableness of the asymmetric erection method of the main girder used in actual construction.The research results show that the mileage difference between the main cable saddle and the bridge position under the two schemes is close,and the vertical pressure value and the main cable flat cutting angle change trend are basically the same;the main cable bending angle on both sides of the cable clamp in the early lifting stage is relatively large,with the maximum value of 3.7°,which will gradually decrease in the later period;the overall change trend of the main cable height is the same and the main cable height after the completion of the steel box girder hoisting is the same,which has no effect on the later welding work of the steel box girder.The structural calculation results under the two schemes are basically the same,which illustrates the feasibility of the asymmetric hoisting scheme.At the same time,this scheme greatly speeds up the construction period and saves project expenditure costs.
作者
蹇宏
JIAN Hong(CRCC Harbour&Channel Engineering Bureau Group Co.Ltd.,Zhuhai Guangdong 519000,China)
出处
《铁道建筑技术》
2021年第9期88-91,101,共5页
Railway Construction Technology
基金
中国铁建港航局集团有限公司科技研究开发计划项目(2020-A05)。
关键词
非对称吊装
索鞍顶推
主缆平切角
主缆折角
主缆线形
asymmetric hoisting
cable saddle pushing
flat cutting angle of main cable
main cable bending angle
main cable shape
