摘要
主要对大纵坡柔性高墩出现偏位病害原因进行分析,将偏位墩柱纠偏至最佳状态,更换支座后使支座恢复至理想工作状态,以消除病害危险因素;纠偏前需先将原有支座拆除,更换为临时滑动支座后实施纠偏;主要采用PLC多点同步控制液压系统对多台千斤顶进行油压控制进而对反力架实施顶推,反力架受力后通过精轧螺纹钢拉动反力底座,反力底座受拉力作用于盖梁侧壁,形成一个循环受力系统,最终将发生偏位的墩柱拉至最终复位状态(经计算及现场监测情况确定);纠偏完成后,针对纠偏最终状态制订墩柱加固方案,墩柱加固采用墩柱底部增大混凝土截面法。纠偏加固完成后,经长期观测,桥梁支座已恢复正常工作状态。
This paper mainly analyzes the causes of deflection disease of flexible high pier with large longitudinal slope.During the treatment process,the deviation pier column is rectified to the best state,and the support is restored to the ideal working state after the support is replaced,in order to eliminate the dangerous factors of the disease.Before rectification,the original support should be removed firstly,and then the temporary sliding support should be replaced to correct the deviation.In rectifying deviation process,the hydraulic system of PLC multi-point synchronous control is mainly used to control the hydraulic pressure of multiple jacks,and then push the counter-force frame.After the reaction frame is stressed,it pulls the reaction base by finishing rolling thread steel,and the reaction base is affected by the pull force on the side wall of the cover beam.Forming an integral cyclic force system,it will eventually be issued when the deviation correction is completed,the reinforcement scheme of pier column is made according to the final rectification state,and the concrete section method is used to strengthen the pier column at the bottom of pier column.After the completion of rectification and reinforcement,after long-term observation,the bridge support returned to normal working state.
作者
刘强
张廷慧
LIU Qiang;ZHANG Tinghui(No.1 Engineering Co.,Ltd.of FHEC of CCCC,Beijing 102205,China)
出处
《施工技术》
CAS
2019年第17期44-50,共7页
Construction Technology
关键词
桥梁工程
刚构桥
纠偏
柔性高墩
截面法
方案
bridges
rigid frame bridges
deviation correction
flexible high piers
section method
scheme
