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Abstract

In this study, the cause of the failure of the fastening bolts

which led to the mobile crane-related industrial accident was

investigated. At the time of the accident, the fastening bolts of

the bucket-type work platform attached to the end of the boom

head of the mobile crane were failed and the bucket-type work

platform fell down to 6 m resulting in two deaths while two

workers were carrying out the work of attaching some steel

parts to the ceiling in the tunnel on the bucket. The process of

the accident and the situation of the accident site were

identified through the investigation of the industrial accident

site and the possibilities of failure of the fastening bolts were

checked by using the finite element analysis of the buckettype work platform and the bolts. In the accident, it was

judged that the two upper bolts loosely fastened to the nuts

were failed first, then, the two lower bolts were failed and the

bucket-type work platform fell to the ground through the

investigation of the industrial accident and the finite element

analysis which confirmed that the bolts would not have failed

if the bolts had properly installed between the end of the boom

head and the bucket-type work platform but only the two

lower bolts could not withstand the loads applied at the time

of the accident also.

Through this study, the necessities for preventing improper

fastening of bolts and damaging to the bolts at the time of

detaching and attaching a bucket-type work platform to a

mobile crane by prohibiting the use of a mobile crane illegally

installed a bucket-type work platform as an aerial work

platform and forcing to use a legally certified aerial work

platform instead, and the necessities for checking the proper

fastening of bolts and the preventing measures against

loosening of bolts and nuts were identified.
 

Keywords: Industrial accident; Mobile crane; Failure of bolt;

Finite element analysis;