In this paper, with the fault tree analysis of high altitude falling accidents in construction, we get three minimum cut sets and sort the events into four important levels on the basis of basic events importance. Then we create a reason pre-control model with five levels to avoid falling accidents in construction, which concludes organizational factors, unsafe supervision, unsafe operating conditions, provided that unsafe behavior and unsafe behavior. By combining the optimal feedback paths basic event importance sort, we proposed targeted risk control measures, so as to achieve pre-control of falling accidents in construction.
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