重庆鹅公岩轨道交通悬索桥边跨钢箱梁顶推施工技术
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摘要
根据大桥结构特点及桥址处施工条件,重庆鹅公岩轨道交通专用悬索桥边跨钢箱梁施工采用步履式顶推方案。根据顶推施工需要,在两边跨设置临时墩、导梁等临时设施。顶推过程中,通过控制顶推装置起顶力调整临时墩支撑反力,通过设置配重等措施保证主梁抗倾覆稳定性,通过增大梁底支撑面积保证钢箱梁腹板局部稳定性。经研究和实际施工验证,通过提高顶推装置同步性精度和选取适当的临时墩纵向刚度,可减小顶推过程中的水平力。为避免竖向反力过大,施工时需严格控制各顶推装置起顶力。
Based on structural characteristics and construction conditions of the bridge,the walking-type incremental launching scheme was used in side span steel box girder of E'gongyan suspension bridge of Chongqing urban rail transit. According to the requirements of incremental launching,temporary pier and guiding beam were set up at both side spans. In the process of incremental launching,support reaction of the temporary pier was adjusted by controlling incremental launching force of the incremental launching device. Counterweight was used in order to ensure the antioverturning stability of the girder. The support area of girder bottom was increased to guarantee the local stability of steel box girder web plate. It was verified by research and actual construction that,through enhancing synchronization accuracy of the incremental launching device and selecting the appropriate longitudinal stiffness of temporary pier,the horizontal force in the process of incremental launching can be reduced. To avoid the too large vertical reaction,the incremental launching force should be strictly controlled during construction.
Based on structural characteristics and construction conditions of the bridge,the walking-type incremental launching scheme was used in side span steel box girder of E'gongyan suspension bridge of Chongqing urban rail transit. According to the requirements of incremental launching,temporary pier and guiding beam were set up at both side spans. In the process of incremental launching,support reaction of the temporary pier was adjusted by controlling incremental launching force of the incremental launching device. Counterweight was used in order to ensure the antioverturning stability of the girder. The support area of girder bottom was increased to guarantee the local stability of steel box girder web plate. It was verified by research and actual construction that,through enhancing synchronization accuracy of the incremental launching device and selecting the appropriate longitudinal stiffness of temporary pier,the horizontal force in the process of incremental launching can be reduced. To avoid the too large vertical reaction,the incremental launching force should be strictly controlled during construction.
引文
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[9]中华人民共和国住房城乡建设部.GB 50017—2017钢结构设计规范[S].北京:中国建筑工业出版社,2017.
[10]陈绍蕃.钢结构稳定设计指南[M].北京:中国建筑工业出版社,2004.
[2]涂满明.洪山庙大桥钢梁顶推施工技术[J].铁道建筑,2003,43(6):13-15.
[3]付永乐.通惠河桥钢箱梁顶推施工技术[J].铁道建筑,2007,47(3):11-13.
[4]韩胜利.大跨高墩钢箱梁多点同步顶推技术[J].世界桥梁,2012,40(6):24-28.
[5]陈永宏.平胜大桥自锚式悬索桥钢箱梁顶推施工[J].桥梁建设,2006,36(增1):33-35.
[6]周水兴,何兆益,邹毅松.路桥施工计算手册[M].北京:人民交通出版社,2001.
[7]徐君兰,项海帆.大跨度桥梁施工控制[M].北京:人民交通出版社,2000.
[8]董国祯,郭辉.鹅公岩城轨专用桥边跨钢箱梁顶推施工整体受力分析[J].铁道建筑,2016,56(9):26-30.
[9]中华人民共和国住房城乡建设部.GB 50017—2017钢结构设计规范[S].北京:中国建筑工业出版社,2017.
[10]陈绍蕃.钢结构稳定设计指南[M].北京:中国建筑工业出版社,2004.