Research On The Risk Assessment Of Falling Accidents At Heights In Building Engineering Based On LEC Improved Model

Falls from heights are the safety accidents with the highest frequency in my country’s construction industry and cause the most casualties and property losses.How to effectively reduce the occurrence of falls from heights and carry out targeted preventive measures is an urgent problem to be solved in the construction industry.At present,the analysis and research on the causes of falls from heights mainly focus on a single risk factor.There are few studies on the impact of the coupling of multiple risk factors on accidents,and there is also a lack of scientific and reasonable research on fall from height accident plans.Therefore,it is particularly urgent to study the multi-factor coupling risks that cause accidents,and to formulate preventive measures for falls from heights based on comprehensive risk analysis of multiple factors.This paper takes the fall from height accident as the research object,uses the N-K model and the coupling model to explore the coupling relationship between different risk factors,and solves the comprehensive coupling risk value of the fall from height accident caused by construction activities.Based on the high subjectivity of the traditional LEC model and the lack of comprehensive coupling analysis of risk factors,the three key parameters of L,E and C in the model were improved,and the L was adjusted to the probability value corresponding to different construction activities in the accident report;The E value is adjusted to the risk value of the construction personnel exposed to danger;the C value is adjusted to the comprehensive evaluation value of the impact of the accident using the TOPSIS-entropy weight method,and the comprehensive coupling risk value H is introduced into the improved model.The improved LEC model is used to evaluate the accident risk,and the accident risk value after taking different preventive measures is recalculated,and the optimal preventive measures are selected based on the analysis of the calculation results.The research results have certain theoretical and practical guiding significance for the prevention and risk assessment of falls from heights.