摘要
某高速铁路连续刚构-拱组合桥地处峡谷汇风区,基本风速达24.8 m/s,主跨跨径为220 m,主拱肋为钢管混凝土结构,采用等高度哑铃形截面。针对该桥结构特点和桥址处的地质、环境条件,本文提出了支架原位拼装方案、原位支架卧拼并竖转合龙方案与异位支架拼装并纵向滑移施工方案,从工期、技术可行性、经济性、安全性4个方面进行探讨。结果表明:该方案在山区峡谷汇风区9级烈风作用下最大横向偏位为48.06 mm,最大拉应力为92.24 MPa,最小整体稳定性安全系数为12.69,均满足规范要求;且大桥钢管拱顺利合龙验证了该方案适用于跨度大、墩高、桥址风速较大的钢管拱桥的施工,最终选择支架原位拼装施工方案。
The continuous rigid frame-arch of a high-speed railroad is located in the canyon wind convergence area,the basic wind speed reaches 24.8 m/s,the main span is 220 m,and the main arch rib is a steel pipe concrete structure with equal height dumbbell section.In view of the structural characteristics of the bridge and the geological and environmental conditions at the bridge site,the in-situ bracket assembly scheme,the in-situ bracket assembly and vertical rotation assembly scheme,the heterogeneous bracket assembly and longitudinal sliding construction scheme are proposed,four aspects of duration,technical feasibility,economy to safety are discussed.The results show that the maximum lateral deflection is 48.06 mm,the maximum tensile stress is 92.24 MPa,and the minimum overall stability safety factor is 12.69 under the effect of level 9 gale in the mountain canyon wind convergence area,all of which meet the requirements of the specification;and the smooth assembly of the bridge steel pipe arch verifies that the scheme is suitable for the construction of steel pipe arch bridge with large span,high pier,and large wind speed at the bridge site,and the bracket in-situ assembly construction scheme is finally chosen.
作者
汤宇
田仲初
刘云龙
凌涛
吴广
TANG Yu;TIAN Zhongchu;LIU Yunlong;LING Tao;WU Guang(The First Engineering Co.,Ltd.,Railway WUJU Group,Changsha 410117,Hunan China;School of Civil Engineering,Changsha University of Science&Technology,Changsha 410114,Hunan,China)
出处
《工程建设》
2022年第3期66-72,共7页
Engineering Construction
基金
宁夏回族自治区重点研发计划资助项目(2021BEG02021)。
关键词
连续刚构-拱
铁路桥
钢管拱
方案比选
continuous rigid frame-arch
railroad bridge
steel pipe arch
scheme comparison
