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Case No.23
Trapped by a belt conveyor while trying to
retrieve a dropped tool during periodic incinerator
inspection and repair work
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[Circumstances of Incident]
The accident, which occurred during periodic
inspection and repair work at an incineration
facility, involved work to remove ash deposited
on the brick lining of the exhaust-gas cooling
tower.
On the day of the accident, the victim and
his foreman had assembled a scaffold inside
the cooling tower in order to carry out ash
removal work on the chute at a bottom of
the cooling tower. They were standing on
the scaffold and using chippers to remove
ash deposits. At the time, a screw fastening
the chisel blade to the working edge of the
chipper was loosened by the vibration of
the scraping work, allowing the blade to
fall under the belt conveyer located below.
The victim stepped down from the scaffold
to retrieve the dropped blade. As the workers
had left the belt conveyor running to carry
away the loosened ash deposits, however,
the victim was killed when he was caught
between the supporting framework and the
scraper blades of the belt conveyer.
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[Causes]
The following can be cited as the direct
causes of this accident.
1 It is assumed that the victim entered into
the conveyer area without stopping the belt
conveyor to retrieve the dropped chisel blade
that had fallen beneath the belt. As the
conveyer was being operated at slow speed,
he evidently was confident that he would
not be caught by the scrapers.
2 There had been other cases in the past
when tools such as chisel blades, etc., had
fallen during such work, and workers had
no other choice but to approach the belt
conveyor to retrieve such items. While the
manager of the general contractor and the
foreman in the victim's workplace had told
workers to "be certain to stop the belt
conveyor while working near it," specific
directions were not given to the workers
involved, nor had standard operating procedures
been drawn up.
3 Moreover, while the foreman was told that
the victim would be approaching the conveyer,
he did not instruct the victim to stop the
conveyer.
4 Despite the fact that the chisel blade
of the chipper was easily prone to come loose
because of the vibration and similar phenomena
occurred several times a day, no efforts
were made to improve the tool or to take
measures to prevent such items from falling
from the scaffold.
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[Type of business] Other construction
[Type of accident]Caught
[Number of victims]One fatality |
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