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Overturning of a crane-mounted truck while
carrying out work to load steel plate
|[Circumstances of Incident]
During work to load steel plate by using
a crane mounted on a truck, the vehicle overturned
and trapped the victim between an outrigger
and the railing of a bridge.
1. This construction work involved the installation
of sewer piping, and the only work remaining
prior to the day of the accident consisted
of leveling the height of the backfilled
sections and paving over the area where the
piping had been buried.
2. The work scheduled for the day of the
accident included the delivery of earth and
sand, surface rolling, cutting the paving
sections, and laying the brick pavement for
The victim drove the crane-mounted truck
to a leasing company to rent a concrete cutter.
3. After returning to the site, the victim
was instructed to remove three steel plates
that were laid over the portion of the trench
that had not yet been backfilled. The victim
started the work by himself, using the crane
mounted on the truck.
4. The victim stopped the crane-mounted truck
on a bridge, attached a sling to a steel
plate and prepared to hoist it onto the bed
of the truck. As he lifted the plate and
tried to swing the boom some 90 degrees to
place the plate on the bed of the truck,
the truck toppled over onto the victim who
was standing at the side and operating the
crane. The victim's left thigh was caught
between an outrigger and the railing of the
bridge, and he died about 11 hours after
The following can be cited as the causes
of this accident.
1. At the time the crane-mounted truck turned
over, the victim was operating the crane
from a narrow space between the bridge railing
and the outrigger.
2. When the crane-mounted truck turned over,
the outrigger was extended, but its length
wasn't enough. The angle of the jib boom
was 30 degrees, and the jib length was 5.61
meters. As the rated load of the crane in
that configuration was only 0.4 ton, the
victim was attempting to use the crane beyond
its rated capacity.
3. The operating method, work methods and
measures to prevent overturns had not been
specifically determined for cases involving
the use of a crane mounted on a truck to
carry out such work.
4. The victim had conducted the slinging
work on his own, despite the fact that he
was not qualified to perform slinging work.
|[Type of business] Construction
[Type of accident]Caught
[Number of victims]One fatality