|M.Sc Thesis||Department of Civil and Environmental Engineering|
|Supervisor:||Assoc. Prof. Shapira Aviad|
Any construction site with tower cranes is doubtlessly a hazardous workplace. This research revealed that for every severe accident (life and bodily injuries) involving a tower crane - an incident that requires that a report be filed with the authorities - dozens of minor accidents occur (damage to property) and many thousands of "close calls" ("almost accidents").
The research constitutes the manifestation of a novel, comparative and quantitative approach to the treatment of hazards involved in the use of cranes. The approach calls for a proactive treatment of safety issues: identification, during the pre-execution stages, of weak points (i.e. safety hazards) in the project's safety setup, thus enabling optimal advance preparation considering the resources available to the construction company. For this end, 22 safety hazards were identified, which together form a picture of the safety situation at the construction site in all that pertains to managerial-organizational considerations. Using these hazards, a specific construction site that includes one or more tower cranes can be characterized vis-a-vis safety, and comparisons can be made between different sites. For the purposes of this research, a safety hazard was defined as a factor that can influence the chance of an accident occurring and/or the expected severity of such an accident involving a tower crane.
In addition to identifying the hazards, the present research performed a comprehensive review of the factors identified: description, analysis, comparison of properties, and the degree of influence on the chance of accident. Major hazards, from the point of view of their influence on the chance of accident, were "Crane operator's experience and skill" and "Safety management on the site level". The resultant by-product was an analyzed and catalogued collection of safety events in which tower cranes are involved.