大跨度拱桥吊装施工线形控制研究
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摘要
以某大桥为例,探讨大跨度拱桥吊装施工线形控制方法。根据拱肋预制节段吊装就位过程的特点,提出刚性-弹性索法结合正装迭代法进行吊装过程理论分析,以得到拱肋就位坐标;通过事先在拱肋预制节段中布设坐标观测点对拱肋吊装过程和拱上建筑加载过程中的变形状况进行现场监测。监测结果表明:该大桥各圈拱肋的合拢线形与理论线形吻合良好,其高程误差符合相关规范的要求。通过对该桥施工过程进行严密监控,确保工程质量和施工安全。该桥的成功建成表明上述方法具有较好的适应性,可供类似桥梁参考。
The configuration controlling measures of large span arch bridges were discussed by taking the construction of certain bridge as an example.According to the actual lifting and assembling process of the precast segments of the arch ribs,a theoretical analysis method is called rigid-elastic cable method was proposed for acquiring the installing coordinates of precast arch rib segments.Observation points for three dimensional coordinates gauges were installed prior to the lifting and assembling of the precast arch rib segments in order for in situ monitoring of the deformation of the arch during its lifting and assembling process as well as the construction process of the up-arch superstructure.The monitoring results show that the closure curves of all the arch ribs are in a good accordance with the theoretical ones,and the elevation errors of the arch ribs meet the demand specified by the relevant codes,and the deformation induced in the construction of up-arch superstructure develops evenly in the whole arch within safety limits.Through such a severe monitoring of its construction process,the quality and construction safety of the bridge are ensured,and the successive construction of the bridge illustrates the favorable applicability of the proposed methods,which can be adopted in the construction of similar structures.
The configuration controlling measures of large span arch bridges were discussed by taking the construction of certain bridge as an example.According to the actual lifting and assembling process of the precast segments of the arch ribs,a theoretical analysis method is called rigid-elastic cable method was proposed for acquiring the installing coordinates of precast arch rib segments.Observation points for three dimensional coordinates gauges were installed prior to the lifting and assembling of the precast arch rib segments in order for in situ monitoring of the deformation of the arch during its lifting and assembling process as well as the construction process of the up-arch superstructure.The monitoring results show that the closure curves of all the arch ribs are in a good accordance with the theoretical ones,and the elevation errors of the arch ribs meet the demand specified by the relevant codes,and the deformation induced in the construction of up-arch superstructure develops evenly in the whole arch within safety limits.Through such a severe monitoring of its construction process,the quality and construction safety of the bridge are ensured,and the successive construction of the bridge illustrates the favorable applicability of the proposed methods,which can be adopted in the construction of similar structures.
引文
[1]杨小礼,王金明,眭志荣.基于Hoek-Brown屈服准则的隧道围岩稳定性分析[J].铁道科学与工程学报,2008,5(5):37-40.YANG Xiao-li,WANG Jin-ming,SUI Zhi-rong.Stabilityanalysis of tunnel surrounding rock based on Hoek-Brown yield criterion[J].Journal of Railway Scienceand Engineering,2008,5(5):37-40.
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[7]邹中权,贺国京,吴再新.大跨度拱桥吊装过程计算方法[J].铁道科学与工程学报,2007,4(3):27-31.ZOU Zhong-quan,HE Guo-jing,WU Zai-xin.Researchon computation methods for long-span arch bridge inconstructing process while its precast segments are assem-bled with cables[J].Journal of Railway Science and En-gineering,2007,4(3):27-31.
[8]袁海庆,范小春,范剑锋,等.大跨度钢管混凝土拱桥拱肋吊装预测的迭代前进算法[J].中国公路学报,2003,16(3):48-57.YUAN Hai-qing,FAN Xiao-chun,FAN Jian-feng,et al.Iterative go-ahead method of rib-assembling predictingfor long-span concrete filled steel tubular arch bridge[J].China Journal of Highway and Transport,2003,16(3):48-57.
[2]杨小礼,眭志荣.应力剪胀对浅埋隧道稳定性系数的影响[J].中南大学学报:自然科学版,2008,39(1):190-195.YANG Xiao-li,SUI Zhi-rong.Influences of stress dilat-ancy on stability factors of shallowtunnels[J].Journal ofCentral South University:Science and Technology,2008,39(1):190-195.
[3]郑皆连.特大跨径RC拱桥悬拼合拢技术的探讨[J].中国公路学报,1999,12(1):42-49.ZHENG Jie-lian.Discussion on technology of suspendingand connecting for the RC bridge with an unusual bigspan[J].China Journal of Highway and Transport,1999,12(1):42-49.
[4]张开银,刘三元,何雨微.大跨度钢管混凝土拱桥线形动态控制技术[J].武汉交通科技大学学报,2000,24(1):1-4.ZHANG Kai-yin,LIU San-yuan,HE Yu-wei.Dynamiccontrol of the arch rib alignment for long span concrete-filled steel-tube arch bridge[J].Journal of WuhanTransportation University,2000,24(1):1-4.
[5]周水兴,江礼忠,曾忠,等.拱桥节段施工斜拉扣挂索力仿真计算研究[J].重庆交通学院学报,2000,19(3):8-12.ZHOU Shui-xing,JIANG Li-zhong,ZENG Zhong,et al.Simulate calculation study of cable-stayed force for archbridge segmental construction[J].Journal of ChongqingJiaotong Institute,2000,19(3):8-12.
[6]杨小礼,罗恒,李老三.应单拱四车道公路隧道地震响应研究[J].中南大学学报:自然科学版,2008,39(6):1314-1318.YANG Xiao-li,LUO Heng,LI Lao-san.Dynamic re-sponse of single arch tunnel with four lanes induced byearthquake[J].Journal of Central South University:Sci-ence and Technology,2008,39(6):1314-1318.
[7]邹中权,贺国京,吴再新.大跨度拱桥吊装过程计算方法[J].铁道科学与工程学报,2007,4(3):27-31.ZOU Zhong-quan,HE Guo-jing,WU Zai-xin.Researchon computation methods for long-span arch bridge inconstructing process while its precast segments are assem-bled with cables[J].Journal of Railway Science and En-gineering,2007,4(3):27-31.
[8]袁海庆,范小春,范剑锋,等.大跨度钢管混凝土拱桥拱肋吊装预测的迭代前进算法[J].中国公路学报,2003,16(3):48-57.YUAN Hai-qing,FAN Xiao-chun,FAN Jian-feng,et al.Iterative go-ahead method of rib-assembling predictingfor long-span concrete filled steel tubular arch bridge[J].China Journal of Highway and Transport,2003,16(3):48-57.
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