International Journal of Engineering and Technology

A variety of perspectives and opinions on the causes of construction machinery-related accidents were collected through a questionnaire survey and direct interviews with management supervisors, operators, etc. The accident causes will be analyzed using 5Whys technique for major construction machinery disaster case. Improvement ideas will be suggested with an aspect of technical training, management system in the study. In the case of tower cranes, some of the risk factors are being neglected in formal inspections. The reliability of the maintenance performed by rental companies is low. Moreover, in the case of big cranes, unsatisfactory installation and dismantling teams with insufficient expertise can be assigned to sites. There is no process for checking this onsite and management supervisors may just neglect the safety supervision of the installation/dismantling work due to insufficient experience. Excavator accidents cannot be eradicated, e.g. with buckets falling due to the lack of fixing of the bucket's safety device during operation. Crashing and jamming accidents involving workers and excavators have occurred due to the lack of placement of full-time guiders and the lack of excavator control around the sites.