Research On Io T-based Suspended Platform And Cantilever Casting Construction Monitoring System

Cantilever pouring construction with suspended platforms is currently a common method for bridge construction.This technology can improve construction efficiency and quality,but it also poses some safety hazards that require monitoring during the construction process.Traditional monitoring methods often use manual inspections or handheld instruments for measurement.However,this method has problems such as low efficiency,inability to monitor in real-time,and insufficient use of monitoring data,which cannot meet the requirements of modern construction.With the continuous development of Internet of Things(Io T)technology,it is possible to establish a suspended platform cantilever pouring construction monitoring system based on Io T using wireless sensors and cloud storage technologies.This system can achieve real-time monitoring of the construction process and timely warnings with data permanently stored in the cloud.The system reduces monitoring costs,improves construction safety and quality,and has significant application value.The main research content and conclusions of this article are as follows:(1)Research on the bridge construction process and construction monitoring.With Yunmengshan Extra-large Bridge as the reference project,a finite element model of the bridge was established using Midas Civil,and the construction process was simulated and analyzed,focusing on the variation of main girder stress and shape in each construction stage.Based on the results,the construction monitoring contents of the bridge were determined,including foundation settlement,main girder geometric shape,pier and main girder stress.According to the principle of monitoring point layout,the layout scheme for each monitoring content was formulated.(2)Research on monitoring thresholds for measuring points.Sensitivity analysis was conducted on construction control parameters to study their effects on the main beam’s shape and stress.The results show that when the concrete unit weight,concrete elastic modulus,and prestress are decreased and increased by 2%,6%,and 10% respectively,the resulting differences in the maximum deflection of the main beam are:(2.5mm,7.5mm,12.5mm,-2.5mm,-7.5mm,-12.5mm),(-0.6mm,-2.0mm,-3.5mm,0.6mm,1.8mm,2.8mm),(-1.7mm,-5.3mm,-8.8mm,1.7mm,5.2mm,8.6mm).The variations in concrete unit weight and prestress cause differences in the maximum stress of the main beam:(0.3MPa,0.9MPa,1.4MPa,-0.3MPa,-0.9MPa,-1.4MPa),(0.5MPa,1.5MPa,2.4MPa,-0.5MPa,-1.4MPa,-2.4MPa).However,the influence of variations in concrete elastic modulus on the main beam stress is negligible and can be ignored.Based on the above analysis results and in conjunction with current regulations and past engineering cases,the monitoring thresholds for measuring points for this bridge were determined.The measured shape error does not exceed 20 mm compared to the theoretical value,and the stress error does not exceed 2MPa.Additionally,as the construction progresses,the threshold interval for each stress measuring point also changes accordingly.(3)Design of the monitoring system for hanging basket cantilever pouring construction.In order to achieve functions such as real-time monitoring and timely warning of the monitoring system,the monitoring system is divided into five parts: sensor subsystem,data acquisition subsystem,data transmission subsystem,data storage and management subsystem,and structural warning and evaluation subsystem.The design includes the implementation path of the software system,technical solutions for data transmission and storage,and automatic warning scheme for the structure.(4)Implementation and testing of monitoring system.The development process of the system is introduced from the system platform mode,development environment,and technical architecture.After completion,users can view real-time monitoring data and warning information through the web end,realizing real-time monitoring and timely warning of the construction site.The system is subjected to performance testing and field testing,and the results show that the system’s processing capacity,response speed,warning function,scalability,real-time performance,stability,and reliability meet the requirements of construction monitoring.Therefore,the system can be used for monitoring the hanging basket cantilever pouring construction and can effectively reduce the monitoring cost of construction,improve construction efficiency and quality,and ensure the safety of workers.