衡山湘江大桥换索工程研究
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摘要
结合衡山湘江大桥斜拉索换索工程并基于最优化原理,介绍索力的优化理论,研究该桥的换索原则、方案及其施工工艺。研究结果表明:在换索工作中,主梁的弯矩、轴力,索塔根部弯矩、轴力均呈现周期性变化。拆除旧索,引起其它拉索产生内力重分布,索力变化明显。拆除某号拉索,影响最大的是与之相邻的2根索,索力均增大,其次影响最大是索塔背面相近拉索,索力均减小。而其他有关拉索在被更换时,该索的索力所受到的影响相对较小。拆除旧索,主梁线形及塔顶位移发生变化,近似呈现周期变化。根据最优化原理,调索最终(实测)索力与理论索力基本一致,最大误差约1%。
Based on an optimization theory, the optimization theory of cable force is introduced first. Take Hengshan Xiangjiang bridge as an example, the cables' replacement plan and principle and construction technology are detailed introduced. During the construction period of cables replacement, bending moment and axial force of main girder appear periodic changes as well as bending moment and axial force at the bottom of cable tower. When demolishing one old cable, other cables' tension has obvious redistribution. Replacement of a cable has the greatest influence on the adjacent two cables, their cable forces increase. It has the second greatest influence on similar cables on the back of cable tower, their cable forces are reduced. Other relevant cables are replaced, the impact of the cable is relatively small. During the construction period of cables replacement, the girder alignment and displacement at the top of the tower approximate change periodically. According to the principle of optimization, the finally completed cable force that is measured is basic consistent with its theoretical value, the maximum error is about 1%.
Based on an optimization theory, the optimization theory of cable force is introduced first. Take Hengshan Xiangjiang bridge as an example, the cables' replacement plan and principle and construction technology are detailed introduced. During the construction period of cables replacement, bending moment and axial force of main girder appear periodic changes as well as bending moment and axial force at the bottom of cable tower. When demolishing one old cable, other cables' tension has obvious redistribution. Replacement of a cable has the greatest influence on the adjacent two cables, their cable forces increase. It has the second greatest influence on similar cables on the back of cable tower, their cable forces are reduced. Other relevant cables are replaced, the impact of the cable is relatively small. During the construction period of cables replacement, the girder alignment and displacement at the top of the tower approximate change periodically. According to the principle of optimization, the finally completed cable force that is measured is basic consistent with its theoretical value, the maximum error is about 1%.
引文
[1]李宏江. PC斜拉桥拉索使用现状及其养护技术进展[J].公路工程, 2014(5):165-169.LI Hongjiang. The current service status and maintenance advances of stay cables in prestressed concrete cable-stayed bridges[J]. Highway Engineering, 2014(5):165-169.
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[9]张恒.基于切割放张法的快速更换拉索技术研究[J].公路交通技术, 2015, 6(5):60-62.ZHANG Heng. Research on stayed cables quickreplacing technique based on cutting pay-off method[J].Highway Traffic Technology, 2015, 6(5):60-62.
[10]孙全胜,于海营.卡尔曼滤波法在斜拉桥换索中的应用[J].中外公路, 2009, 29(6):153-156.SUN Quansheng, YU Haiying. Application of Kalman filtering method in cables replacement in cable-stayed bridges[J]. Journal of China&Foreign Highway, 2009,29(6):153-156.
[11]施洲,蒲黔辉,夏招广.犍为岷江大桥换索前后检测及荷载试验的比较与分析[J].公路, 2007, 6(6):7-11.SHI Zhou, PU Qianhui, XIA Zhaoguang. Comparison and analysis of inspection and loading tests before and after cable replacement of Qianwei Minjiang great bridge[J]. Highway, 2007, 6(6):7-11.
[12]李劭晖,黄林根,翁思熔.西樵大桥换索工程施工监控技术研究[J].城市道桥与防洪, 2010, 2(2):92-94.LI Shaohui, HUANG Lingen, WENG Sirong. Research on construction monitoring techniques of cable replacement of Xiqiao bridge[J]. Urban Roads Bridges&Flood Control, 2010, 2(2):92-94.
[13] Powers T, Price K, He E, et al. Reconstruction of North Avenue Bridge over the Chicago river, Chicago,Illinois[C]//6th International Bridge Engineering Conference, Boston, 2005:459-464.
[2]成永强.既有斜拉桥换索状况综述[J].山西建筑, 2015,36(25):332-334.CHENG Yongqiang. Overview on cable replacement condition of existing cable-stayed bridge[J]. Shanxi Architecture, 2015, 36(25):332-334.
[3]孙全胜,吴桐. BP神经网络法在斜拉桥换索施工控制中的应用研究[J].中国安全科学学报, 2010, 20(7):21-25.SUN Quansheng, WU Tong. Application of BP neural network in the cable-replacing construction control of cable-stayed bridge[J]. China Safety Science Journal,2010, 20(7):21-25.
[4]孙全胜,杨建喜.参数增量变化分析在斜拉桥换索施工控制中的应用[J].世界桥梁, 2010(1):53-55.SUN Quansheng, YANG Jianxi. Application of parameter increment variation analysis to construction control of cable replacement of cable-stayed bridges[J]. World Bridge, 2010(1):53-55.
[5]兰建雄.独塔单索面斜拉桥换索施工[J].中国市政工程, 2014, 112(6):33-36.LAN Jianxiong. Construction of cable exchanging for cable-stayed bridge with one pylon and single cableplane[J]. China Municipal Engineering, 2014, 112(6):33-36.
[6]田波,梁健.涪陵长江大桥换索设计[J].四川建筑,2016, 36(2):247-249.TIAN Bo, LIANG Jian. Design of cable replacement in Yangtze River bridge Fuling[J]. Sichuan Architecture,2016, 36(2):247-249.
[7]唐继舜,代璞.斜拉桥换索施工监控技术探讨[J].桥梁建设, 2005(1):65-68.TANG Jishun, DAI Pu. Research of construction monitoring techniques for cable-stayed bridge cable replacement[J]. Bridge Construction, 2005(1):65-68.
[8]朱战良.广东九江大桥换索技术[J].中外公路, 2003,23(5):20-24.ZHU Zhanliang. Guangdong Jiujiang bridge’s cables replacement technology[J]. Journal of China&Foreign Highway, 2003, 23(5):20-24.
[9]张恒.基于切割放张法的快速更换拉索技术研究[J].公路交通技术, 2015, 6(5):60-62.ZHANG Heng. Research on stayed cables quickreplacing technique based on cutting pay-off method[J].Highway Traffic Technology, 2015, 6(5):60-62.
[10]孙全胜,于海营.卡尔曼滤波法在斜拉桥换索中的应用[J].中外公路, 2009, 29(6):153-156.SUN Quansheng, YU Haiying. Application of Kalman filtering method in cables replacement in cable-stayed bridges[J]. Journal of China&Foreign Highway, 2009,29(6):153-156.
[11]施洲,蒲黔辉,夏招广.犍为岷江大桥换索前后检测及荷载试验的比较与分析[J].公路, 2007, 6(6):7-11.SHI Zhou, PU Qianhui, XIA Zhaoguang. Comparison and analysis of inspection and loading tests before and after cable replacement of Qianwei Minjiang great bridge[J]. Highway, 2007, 6(6):7-11.
[12]李劭晖,黄林根,翁思熔.西樵大桥换索工程施工监控技术研究[J].城市道桥与防洪, 2010, 2(2):92-94.LI Shaohui, HUANG Lingen, WENG Sirong. Research on construction monitoring techniques of cable replacement of Xiqiao bridge[J]. Urban Roads Bridges&Flood Control, 2010, 2(2):92-94.
[13] Powers T, Price K, He E, et al. Reconstruction of North Avenue Bridge over the Chicago river, Chicago,Illinois[C]//6th International Bridge Engineering Conference, Boston, 2005:459-464.