摘要
针对高地下水位泥岩地基软弱、施工不当等引起的高层建筑地基不均匀沉降的病害,进而导致上部结构倾斜的工程案例,通过现场勘察研究制定了纠倾加固技术方案并实施,纠倾加固过程中运用沉降观测和倾斜观测研究了大楼的变形特征。结果表明:“锚杆静压桩结合钢筋混凝土灌注桩止倾加固,井形巷道钻孔取土结合锚索加压调控纠倾”的综合纠倾加固方案对该纠倾加固工程切实可行,工程实施后高层建筑倾斜率由3.99‰降低至1.21‰,满足规范及正常使用要求;高层建筑纠倾加固过程中沉降观测结果和倾斜监测结果可以相互验证,监测结果的及时分析反馈可以实现“动态化设计,信息化施工”以便及时适当调整纠倾加固方案,保障大楼结构安全;对高层建筑纠倾加固工程,采取先止倾加固再纠倾加固的方式,纠倾过程及结果会比较理想。
In view of a practical engineering case that the uneven settlement of high-rise building foundation caused by weak mudstone foundation under high underground water level and improper construction,which leads to the inclination of the upper structure,through on-site investigation and research,a technical scheme for rectification and reinforcement was developed and implemented.During the rectification and reinforcement process,settlement observation and inclination observation were used to study the deformation characteristics of the high-rise building.The results show that the comprehensive inclination correction and reinforcement scheme of"anchor static pressure pile combined with reinforced concrete cast-in-place pile for stop-overturning and reinforcement,borehole soil extraction in well shaped roadway combined with anchor cable pressure regulation and correction"is feasible for this inclination correction and reinforcement project.After the implementation of the project,the inclination rate of high-rise buildings is reduced from 3.99‰to 1.21‰,meeting the requirements of the specification and normal use.During the process of rectifying and strengthening high-rise buildings,the settlement observation results and inclination monitoring results can be mutually verified.The timely analysis and feedback of the monitoring results can achieve"dynamic design and informatization construction",so as to adjust the rectification and reinforcement scheme timely and appropriately and ensure the safety of the building structure.For the rectification and reinforcement of high-rise buildings,adopting the method of first stop-overturning and then correcting and strengthening,the rectification process and results will be ideal.
作者
牛文庆
张小兵
郑静
NIU Wenqing;ZHANG Xiaobing;ZHENG Jing(China Academy of Railway Sciences,Beijing 100081,China;Northwest Research Institute Co.,Ltd.of China Railway Engineering Corporation,Lanzhou 730000,China;Gansu Construction Engineering Limited Company of China Railway Engineering Corporation,Lanzhou 730000,China;Key Scientific Research Base of Research of Technology in Integrations and Application of the Grottos Conservation,State Administration for Cultural Heritage,Lanzhou 730000,China;Gansu Engineering Technical Research Centre in Geotechnical Cultural Relics Protection,Lanzhou 730000,China)
出处
《建筑结构》
北大核心
2023年第10期122-127,133,共7页
Building Structure
基金
中铁科研院项目“既有建筑改造与病害处理工程动态安全保障关键技术研究”资助(2016-KJ005-Z005-03)
中铁科研院项目“西北地区建筑纠倾加固成套技术研究”资助(中铁科研院(科研)字2018-KJ018-Z014-XB)。
关键词
高层建筑
纠倾加固
监测
止倾
回倾
high-rise building
rectification and reinforcement
monitoring
stop-overturning
rectifying
