安庆长江铁路大桥主墩基础围堰边锚改进
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摘要
安庆长江铁路大桥主桥采用双塔多跨连续钢桁梁斜拉桥。该桥3号、4号主墩基础采用双壁钢围堰施工,围堰采用无导向船的重锚锚锭系统定位。针对围堰接高过程中出现的部分边锚失效和大直径锚绳收放困难的问题进行原因分析及边锚改进。经分析,出现上述问题的主要原因为原边锚导缆器式马口设计存在缺陷(只能在锚绳共面情况下工作,在竖向外力作用下马口竖轴极难转动),为此将原导缆器式马口更换为辊轴式马口,原围堰顶固定滑移式转向马口增设转轮装置,消除了边锚崩断失效安全隐患,解决了大直径锚绳难以收放的难题。
The main bridge of Anqing Changjiang River Railway Bridge is a double-pylon and multi-span continuous steel truss girder cable-stayed bridge and the foundations for the main piers No.3 and No.4 of the bridge were constructed by the double-wall steel cofferdams that were positioned by the heavy anchor anchorage systems without utilizing the guiding barges.In the light of the problems that part of the side anchors of the cofferdams failed to work and the large diameter steel anchor ropes were difficult to be reeled in and reeled off in the process of height extending of the cofferdams,the causes leading to the problems were analyzed and the improvement of the side anchors were correspondingly made.The results of the analysis showed that the major cause leading to the problems was that the design of the original rope-guided fair leaders for the side anchors had defect,i.e.the anchor ropes could work only under the coplanar condition of the ropes and under the action of vertical external force,the vertical rollers of the fair leaders rotated very difficultly.The rope-guided fair leaders were thus changed into the roller fair leaders,the steering wheel devices were added to the sliding steering fair leaders originally fixed at the tops of the cofferdams and consequently the safety hidden peril that the side anchors might be broken and fail was eliminated and the difficulty of reeling of the anchor ropes was resolved.
The main bridge of Anqing Changjiang River Railway Bridge is a double-pylon and multi-span continuous steel truss girder cable-stayed bridge and the foundations for the main piers No.3 and No.4 of the bridge were constructed by the double-wall steel cofferdams that were positioned by the heavy anchor anchorage systems without utilizing the guiding barges.In the light of the problems that part of the side anchors of the cofferdams failed to work and the large diameter steel anchor ropes were difficult to be reeled in and reeled off in the process of height extending of the cofferdams,the causes leading to the problems were analyzed and the improvement of the side anchors were correspondingly made.The results of the analysis showed that the major cause leading to the problems was that the design of the original rope-guided fair leaders for the side anchors had defect,i.e.the anchor ropes could work only under the coplanar condition of the ropes and under the action of vertical external force,the vertical rollers of the fair leaders rotated very difficultly.The rope-guided fair leaders were thus changed into the roller fair leaders,the steering wheel devices were added to the sliding steering fair leaders originally fixed at the tops of the cofferdams and consequently the safety hidden peril that the side anchors might be broken and fail was eliminated and the difficulty of reeling of the anchor ropes was resolved.
引文
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[8]罗瑞华,于祥君.芜湖长江大桥双壁钢围堰锚锭系统设计与施工[J].铁道标准设计,2002,(9):32-35.(LUO Rui-hua,YU Xiang-jun.Design and Construc-tion of Anchorage System for Double-Wall Steel Cof-ferdam of Wuhu Changjiang River Bridge[J].RailwayStandard Design,2002,(9):32-35.in Chinese)
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[10]陈骑彪,陈玉川,雷江洪,等.长江上游超大直径钢围堰下沉施工技术[J].重庆建筑大学学报,2006,(10):66-69.(CHEN Qi-biao,CHEN Yu-chuan,LEI Jiang-hong,et al.Construction Techniques of Ultra Large Diame-ter Steel Cofferdam Sinking in Upper Stream YangtzeRiver[J].Journal of Chongqing Jianzhu University,2006,(10):66-69.in Chinese)
[2]肖海珠,徐伟,高宗余.安庆铁路长江大桥设计[J].桥梁建设,2009,(5):6-8,20.(XIAO Hai-zhu,XU Wei,GAO Zong-yu.Design ofAnqing Changjiang River Railway Bridge[J].BridgeConstruction,2009,(5):6-8,20.in Chinese)
[3]刘爱林,农代培.安庆长江铁路大桥3号墩围堰锚锭系统设计与施工[J].桥梁建设,2011,(6):1-5,41.(LIU Ai-lin,NONG Dai-pei.Design and Constructionof Mooring System for Cofferdam of Pylon Pier No.3of Anqing Changjiang River Railway Bridge[J].BridgeConstruction,2011,(6):1-5,41.in Chinese)
[4]宋伟俊.南京大胜关长江大桥主墩深水基础施工关键技术研究[J].桥梁建设,2009,(2):1-4,8.(SONG Wei-jun.Research of Key Techniques forConstruction of Deep Water Foundations of Main Piersof Dashengguan Changjiang River Bridge in Nanjing[J].Bridge Construction,2009,(2):1-4,8.inChinese)
[5]铁道部新建铁路工程总局武汉大桥工程局.武汉长江大桥技术总结[M].北京:人民铁道出版社,1958.(Wuhan Major Bridge Engineering Bureau,Adminis-tration of Newly-Built Railway Engineering,the Min-istry of Railways.Technical Summary of Wuhan Yan-gtze River Bridge[M].Beijing:China Railway Pub-lishing House,1958.in Chinese)
[6]于祥君.南京大胜关长江大桥7#墩双壁钢吊箱围堰精确定位施工技术[C]//京沪高速铁路南京大胜关长江大桥工程技术论文集(上册).北京:中国铁道出版社,2009.(YU Xiang-jun.Construction Techniques for AccuratePositioning of Double-Wall Steel Boxed Cofferdam forPier No.7of Dashengguan Changjiang River Bridge inNanjing[C]//Proceedings of Engineering Techniquesof Nanjing Dashengguan Changjiang River Bridge onBeijing-Shangai High-Speed Railway(Volume I).Bei-jing:China Railway Publishing House,2009.in Chi-nese)
[7]铁道部大桥工程局.九江长江大桥技术总结[M].武汉:武汉测绘科技大学出版社,1996.(Major Bridge Engineering Bureau,the Ministry ofRailways.Technical Summary of Jiujiang ChangjiangRiver Bridge[M].Wuhan:Press of Wuhan TechnicalUniversity of Surveying and Mapping,1996.in Chi-nese)
[8]罗瑞华,于祥君.芜湖长江大桥双壁钢围堰锚锭系统设计与施工[J].铁道标准设计,2002,(9):32-35.(LUO Rui-hua,YU Xiang-jun.Design and Construc-tion of Anchorage System for Double-Wall Steel Cof-ferdam of Wuhu Changjiang River Bridge[J].RailwayStandard Design,2002,(9):32-35.in Chinese)
[9]刘洋,何茂文,曾昭东.双壁钢围堰锚锭系统的设计与施工[J].市政技术,2010,(5):82-84.(LIU Yang,HE Mao-wen,ZENG Zhao-dong.Designand Construction of Anchorage System for Double-Wall Steel Cofferdam[J].Municipal EngineeringTechnology,2010,(5):82-84.in Chinese)
[10]陈骑彪,陈玉川,雷江洪,等.长江上游超大直径钢围堰下沉施工技术[J].重庆建筑大学学报,2006,(10):66-69.(CHEN Qi-biao,CHEN Yu-chuan,LEI Jiang-hong,et al.Construction Techniques of Ultra Large Diame-ter Steel Cofferdam Sinking in Upper Stream YangtzeRiver[J].Journal of Chongqing Jianzhu University,2006,(10):66-69.in Chinese)
目录
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