摘要
针对传统监测方式难以保证桥梁施工安全的问题,建立钢箱梁桥施工安全智能监测系统。以振弦式表面应变计感知钢箱梁受力变化,通过智能采集仪获取监测数据,采用无线智能网关控制器中的Lora模块建立局域网,4G模块实现数据远程无线传输,并应用于某钢箱梁立交桥施工监控。通过对跨中钢箱梁焊接前、焊接后、防撞栏施工、撤临时支撑等关键施工工序的应力变化监测,得出:钢箱梁下底板整体受拉明显,且拉应力越来越大,拉应力分布在28.8~64.2 MPa;上顶板受压应力越来越大,压应力分布在-78.1~-21.3 MPa;中腹板应力分布在-10.3~5.8 MPa,表明中腹板参与受力不明显。钢箱梁应力变化符合实际工程发展和基本力学规律,未达到预警值,表明钢箱梁受力稳定,尚未出现异常。研究结果显示,钢箱梁桥施工安全智能监测系统能够揭示不同阶段的受力特征,指导施工计划顺利开展,可为类似工程提供借鉴和参考。
In view of the traditional monitoring method was difficult to ensure the safety in bridge construction stage,therefore,an intelligent monitoring system of steel box girder bridge for construction safety was established and applied to a steel box girder overpass in the paper.The vibration strain gauge was used to monitor the stress of steel box girder,which was connected by intelligent data collection device.The local area network(LAN)was established by Lora wireless communication module,and the data transmission was remotely sent by remote 4G wireless module.By monitoring the stress in key construction processes such as the initial state,after welding,anti-collision bar construction and temporary support removal of steel box girder,it is found that the overall tensile stress of the bottom plate of steel box girder is increasing,which is distributed from 28.8 MPa to 64.2 MPa.Similarly,the compressive stress of the upper roof is also increasing,and distributed from-78.1 MPa to-21.3 MPa.Moreover,the stress distribution of the middle web is from-10.3 MPa to 5.8 MPa.Hence,the load share ratio of the middle web is not obvious,and the stress variation of steel box girder conformes to the actual engineering development.Furthermore,the stress stability of steel box girder is well.The above analysis indicates that the intelligent monitoring system of steel box girder bridge for construction safety can reveal the stress characteristics of different stages,which can guide the smooth implementation of the construction plan,and provide reference for similar projects in future.
作者
乔升访
肖时辉
唐文彬
刘小林
李高堂
唐孟雄
胡贺松
朱毅
陈航
QIAO Shengfang;XIAO Shihui;TANG Wenbin;LIU Xiaolin;LI Gaotang;TANG Mengxiong;HU Hesong;ZHU Yi;CHEN Hang(Guangzhou Institute of Building Science Group Co. , Ltd. , Guangzhou 510440, China;School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510640, China;Zhuhai Da Heng Qin Co. , Ltd. , Zhuhai, Guangdong 519000, China;China Railway 20th Bureau Group Co. , Ltd. , Xi’an 710000, China;Guangzhou Construction Engineering Co. , Ltd. , Guangzhou 510000, China)
出处
《中国科技论文》
CAS
北大核心
2021年第10期1061-1067,共7页
China Sciencepaper
基金
中国博士后科学基金资助项目(2019M662917)
住房和城乡建设部科技计划项目(2020-K-130)
广州市建筑科学研究院有限公司科技进步资金资助项目(2020Y-KJ02,2020Y-KJ03)。
关键词
健康监测系统
钢箱梁
施工监测
无线传输
云平台
health monitoring system
steel box girder
construction monitoring
wireless transmission
cloud platform
