Research On Optimization Of Video Monitoring Points Placement In Construction Site Of Subway Station

With the rapid development of China’s urban construction,subway construction is developing rapidly.The subway construction is a complex system engineering,which has the characteristics of many risk factors,complex construction technology and complex construction environment.As an effective means of risk monitoring,video monitoring system can be used to find the risk factors in time,which is widely used in the safety supervision of the subway station construction site.At present,there are some problems in the construction of subway station,such as the incomplete identification of risk factors and the insufficient coverage monitoring of construction site,which makes it difficult for the video surveillance system to fully monitor the dynamic risk factors.Therefore,the thesis takes open-cut method of subway station construction site with internal support system as the research scope,and studies the problem of video monitoring point placement for dynamic identification of risk factors.Firstly,this thesis constructs the work breakdown structure(WBS)and the risk breakdown structure(RBS)of open-cut method of subway station construction by means of expert experience and literature search.The RBS risk system is established based on WBS by the coupling of the WBS and the RBS.Then,the video monitoring point placement model that satisfies the full coverage of the construction site space area is established by the idea and method of the set covering theory,which is based on the visibility analysis of the construction site in the case where the video monitoring point is blocked by the foundation pit and the support structure.Finally,the genetic algorithm is used to solve the placement model by heuristic improvement of infeasible solution processing method in genetic variation.The thesis takes placement scheme solution of floor construction stage,medium plate construction stage and roof construction stage as examples,verifies and analyzes the placement model.The results show that the placement model proposed in this thesis can provide a monitoring point placement scheme to meet the full coverage of the construction site for different construction stages.In this study,the optimization scheme of monitoring point placement is proposed,which has important theoretical significance and practical significance for the monitoring and management of the subway station project.