Questions of safety of load-lifting cranes structural connections

Abstract

Introduction. The article presents an analysis of accidents of lifting cranes, the causes of which are the destruction of load-bearing structural connections during the designated service life, caused by structural and technological deficiencies, with operational loads not exceeding the passport specifications.Problem Statement. The objective of the study is to analyze the causes of accidents of different types of lifting cranes and the features that connect these accidents.Theoretical Part. A review of statistical data on accidents on lifting cranes has shown that the destruction of load bearing structures occurs not only due to fatigue strength during long-term operation, but also due to insufficient bearing capacity of the hinge joints, violations of technological processes of structural elements welding in conditions not exceeding the passport specifications during the service life.Conclusions. It is established that the destruction occurs in the design elements of metal structures associated with the crane mounting at a relatively high level of operating stresses and insignificant loading cycles, which indicates errors in the design and violations of welding processes during their manufacture.