停工对转体T构悬臂梁线形的影响及调整措施研究  

Study on the Influence of Shutdown on the Alignment of Rotary T-cantilever Beam and Adjustment Measures

作　　者：景国旭 刘兆奇 杨晓强 张华 丁建刚 Jing Guoxu;Liu Zhaoqi;Yang Xiaoqiang;Zhang Hua;Ding Jiangang(Gansu Public Air Travel Tianzhuang Expressway Management Co.,Ltd.,Tianshui 741000,China;School of Highway,Chang’an University,Xi’an 710064,China;China Railway Seventh Bureau Group Co.,Ltd.,Zhengzhou 450016,China)

机构地区：[1]甘肃公航旅天庄高速公路管理有限公司,甘肃天水741000 [2]长安大学公路学院,陕西西安710064 [3]中铁七局集团有限公司,河南郑州450016

出　　处：《市政技术》2024年第12期137-144,共8页Journal of Municipal Technology

基　　金：甘肃省重点研发计划-工业类项目(22YF11GA304);陕西省地方标准项目(22-59B);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)。

摘　　要：依托西北地区某在建转体施工连续刚构桥,利用有限元软件进行了悬浇施工过程的模拟,研究了停工期间主梁实测位移变形与理论值之间的差异,探讨了不同停工位置和停工时间对梁段线形的影响,并对停工期间影响梁段线形的原因进行了分析,提出了事前调整措施。研究结果表明,停工位置和停工时间的变化对T构悬臂梁截面挠度有显著影响;墩柱柔度、边中跨预应力锚固齿块不对称、挂篮质量不平衡以及墩台基础不均匀沉降均会影响T构悬臂梁的线形变化;配重和预应力全张拉是有效应对冬季停工的调整措施。在桥梁施工过程中,建议根据具体情况利用仿真模型预测停工期间梁段的线形变化,并提前做好调整措施,从而确保连续刚构桥的线形平顺。Based on a rotary continuous rigid frame bridge construction in progress in Northwest China,finite element software was used to simulate the construction process of suspension casting.The difference between the measured displacement and deformation of the main beam and the theoretical value during the shutdown was studied,the influence of different shutdown positions and times on the alignment of the beam segment was discussed,and the causes were analyzed to put forward the pre-adjustment measures.The results show that the change of shutdown position and time have significant effect on the deflection of T-cantilever beam;All the flexibility of pier column,the asymmetry of prestressed anchor teeth,the unbalance of hanging basket mass and the uneven settlement of pier foundation will affect the linear change of T-cantilever beam;Counterweight and full prestressed tension are effective adjustment measures to deal with shutdown in winter.During the process of bridge construction,it is suggested to use the simulation model to predict the linear change of the beam section during the shutdown period according to the specific situation,and make adjustment measures in advance to ensure the smooth linear shape of the continuous rigid frame bridge.

关 键 词：连续刚构桥 T构悬臂梁 转体 停工 梁段线形 调整措施 

分 类 号：U445.4[建筑科学—桥梁与隧道工程]