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JICOSH Home > Case Studies > Case No.19
Case No.19


Overturning of a crane-mounted truck while carrying out work to load steel plate
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[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 a sidewalk.

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 accident.
[Causes]
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
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