摘要
某跨铁路独塔斜拉桥索塔高85 m,左右塔柱内倾81.22°,采用翻模+平面转体法施工,逆时针转体93°,转体质量约18 500 t。因此,针对该桥塔因转体质量大、重心高所带来的水平转体施工安全问题,开展了独塔斜拉桥索塔平转施工技术分析、实桥跟踪测试,得到了称重、配重、姿态监测与调整等技术要点。得出的主要结论包括:沿桥塔下横梁与0号梁段上对称平衡配重50 t,可降低桥塔重心;平转过程受不平衡力矩和偏心距的影响较为敏感,桥塔称重与配重误差需严格控制;索塔姿态调整前移出配重,并通过临时支墩锁定索塔姿态;转体前、后垂直度应尽量保持一致。
A cable-stayed railway bridge has pylons of 85 m,inward inclination of 81.22°for the left and right piers.The construction method employed is the combination of formwork construction with planar rotation,which has a counterclockwise rotation of 93°and the rotation weight of approximately 18500 tons.In order to address safety concerns the horizontal rotation during construction because of large weight and high gravity of the pylon,a technical analysis and on-site testing were conducted to obtain the key technical points of weighing,counter weighting,attitude monitoring and adjustment.The main conclusions include:that balancing symmetric counterweights of 50 tonnes along the lower crossbeams and segment 0 beams can reduce the center of gravity;The rotation process is sensitive to unbalanced torque and eccentricity so that pylon weighing and counter weighting errors should be strictly controlled;Before the attitude adjustment,the counterweights are moved out and the pylon’s attitude is locked by temporary supports.The verticality should keep consistent before and after rotation.
作者
郝磊磊
刘书宏
余雪平
褚少康
程高
Hao Leilei;Liu Shuhong;Yu Xueping;Chu Shaokang;Cheng Gao(China Railway 17th Bureau Group Second Engineering Co.,Ltd.,Xi’an 710005,China;Department of Highway,Chang’an University,Xi’an 710064,China;Dongguan Construction Engineering Testing Center Co.,Ltd.,Dongguan 523819,China;Xi’an Chang’an University Engineering Design and Research Institute Co.,Ltd.,Xi’an 710064,China)
出处
《市政技术》
2024年第7期161-166,174,共7页
Journal of Municipal Technology
基金
陕西省秦创原交通基础设施融合与智能建造“科学家+工程师”队伍建设项目(2022KXJ-036)
甘肃省重点研发计划-工业类项目(22YF11GA304)。
关键词
独塔斜拉桥
索塔
平面转体法
称重试验
姿态监测
single-tower cable-stayed bridge
tower
planar rotation method
weighting test
attitude monitoring
