Research On Development Of Safety Monitoring Equipment And Comprehensive Analysis Method For Construction Work At Heights

The construction environment of the heights works is complex and there are many risk factors.The current safety supervision technology is relatively backward.The assessment of the site situation relies on expert experience for qualitative analysis.It is difficult to quantitatively consider the influence of the construction personnel's own changes and environmental factors.It makes it difficult to make reasonable prediction of some sudden dangerous situations,so that timely and effective measures can not be taken.The emergence of intelligent monitoring technology provides new ideas and new methods for real-time supervision of building construction.This paper establishes a safety quantitative index evaluation system for the heights works of building construction.According to human body factors and construction environment variables,an intelligent safety monitoring device and monitoring system are designed and developed,and the corresponding comprehensive analysis and evaluation methods are established.Finally,the intelligent monitoring equipment and comprehensive evaluation and analysis methods are applied to the specific construction for monitoring,analysis and evaluation.The specific research contents and conclusions are as follows:(1)Based on the theory of Heinrich Accident-causing theory,biological rhythms theory,4M1 E method,Path Overlapping theory,etc.,a quantitative evaluation index system for safety of the heights works of building construction was established,and the risk threshold of each factor was determined.Two first-level indicators and nine second-level indicators were determined.(2)Aiming at the established safety quantitative evaluation index system of the heights works of building construction,an intelligent safety monitoring equipment is developed,which can monitor the physical and environmental factors of workers at high altitude in real time.The functions of wireless transmission monitoring data,real-time display of data on Web pages,timely warning of dangerous situation are realized.(3)The weights of risk factors were analyzed by analytic hierarchy process(AHP),setpair theory and entropy weight method.The results showed that the order of importance of physical factors was skin temperature,heart rate and blood pressure;the order of importance of environmental factors was scaffold vibration,wind speed,environmental temperature,noise,PM2.5 and environmental humidity.Principal Component Analysis,Ordered Logistic Regression Analysis and Fuzzy Comprehensive Evaluation are used to classify the results of risk factors monitoring into four grades: excellent,good,medium and poor,which can be used to judge the physical signs of workers and the state of each monitoring day of construction environment.(4)Applying the intelligent monitoring equipment and comprehensive evaluation method to the construction process of the actual construction project,the analysis results show that the operator and the working environment as a whole are in good condition.Further analysis of the workers and the construction environment indicates that the risk-prone period of time is 11:00-17:30.The monitoring results of the construction workers showed that when the skin temperature factor exceeded the threshold,the skin temperature and blood pressure reached the threshold or all three factors were close to the threshold,the danger was more likely to occur;the results of monitoring and analysis of working environment show that when the vibration amplitude of scaffolding exceeds the threshold value or when both the vibration amplitude of scaffolding and PM2.5 reach the threshold value,it is more likely to be dangerous.