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Many fatal accidents due to falling from height have happen at construction sites in Japan. The purpose of this study is about to seek new prevention methods of fatal accidents due to falling. For the first step, this study was carried out to find out "cause of death" in labor accidents by using past statistics data and was analyzed it. For the second, Butt dropping tests were carried out to measure impact load and acceleration of human head and neck by using simplified human model. After that, relationship between the human injury probability and the fall height was discussed by comparing with experimental results and some impact tolerance values for human. From the results of this study, impact force might be able to head trauma involved not only skull fracture but also cervical spinal cord injury. These results suggest needs to explore new protection equipment for head and cervical injuries prevention.

Fundamental study on relationship between human injury probability due to fall and the fall height