| Case Name |
A worker was run over by the crawler of a crawler crane. |
| Pictograph |
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| Date |
September 14, 2002 |
| Place |
Hokkaido |
| Location |
the premises of S operation office of Hokkaido Railway Co. |
| Overview |
This accident occurred during a removal work of temporary footway between girders, following a removal work of girders, and the removal member was moved, whenever the removal member occurred, by a crawler crane in the 70m ahead stockyard in the opposite side of disassemble place. The girder was lifted by the 4.9t crawler crane, after it was cut off at transportable length, and the crane turned with 180 degrees counter-clockwise rotation. A worker corrected the direction of the hanging load, since the direction of the hanging load was bad. The operator confirmed that the direction of the hanging load was repaired, and drove the crane. Then the left leg of the worker was held in the caterpillar, and the worker was turned over. |
| Incident |
* The crawler crane rotated, holding the load. As soon as the direction of the load was repaired because of swing of the load, the operator drove the crane, and ran over the worker without noticing that he was near the crane. |
| Sequence |
* After morning gathering finished at 7:45 a.m., 4 persons including a foreman, a heavy machinery induction man, a heavy machinery operator did removal of a girder (H-400) of a temporary footway.
* The girder was lifted by the 4.9t crawler crane after it was cut at 3.1m long, and the crane rotated, and the worker corrected the direction of the hanging load.
* When the operator who confirmed that the direction of the hanging load was repaired made the crane moved, the worker's left leg was stuck in the caterpillar ( made of rubber ), and turned over.
* Immediately after the operator noticed that situation, he stopped the crane. However, the caterpillar was stopped, trapping his left leg below the crotch. |
| Cause |
* The worker intended to correct the swing of the hanging load while the crane was moving, and he carelessly entered in the operating radius.
* The heavy machinery induction man made the departure signal to the crane operator without noticing that the worker was in the path of the crane.
* Since the worker was on the opposite side from the cabin of the crane, he was not seen by the crane operator.
* The operator thought that the worker would have moved away from the crane.
* Though the worker knew that he had entered a blind area of the operator, he entered in the operating radius.
* The heavy machinery induction man could not confirm the position of the worker, since he was in the rear after the crane rotated.
* The rope for correcting the swing of the hanging load had not been installed.
* Measures related to the potential danger, and education of the standard knowledge were insufficient
* It was believed that prohibition of entering in crane operating radius was well known. |
| Countermeasures |
* A heavy machinery induction man signals and induces in the position where a crane operator can easily see him while turning and driving.
* A manager ( in charge of the safety ) carefully confirms the surroundings.
* Crane, carrier dump, handling machine shall be used jointly, and the driving distance of crane with hanging is changed into about 5m.
* The operational procedure is reexamined in the detail, and all workers are made aware of it. |
| Knowledge Comment |
* Admittance into the heavy machinery turning range is banned.
* A heavy machinery induction man signals it after confirming the surroundings.
* A crane operator operates after confirming the signal.
* A person is in the place where he is not seen.
* "Can" and "May" are the origin of accidents ! |
| Background |
* Since the removal members were few and light, it was the plan that each of the removal member was moved and transported.
* The hanging transportation was chosen, because the cycle of the disassembly/movementit was longer than the time of going back and forth.
* 25 lines were located in the premises of S operation office, and since trains always went in and out, many carts could not enter there. Therefore, these things led to the feeling that it wanted to also reduce the number of machines.
* The boom during running was almost horizontal, since it was influenced by the overhead wires, the load was light, and it was the hanging transportation at 30cm height from the ground.
* Swing of the load was controlled by rope during rotating when crossing line. |
| Sequel |
* The heavy machinery induction man was in the position where he was seen from the disassembly side, and intended to move in front of the movement side of the crane, after he signaled for lifting and rotating.
* Then, since the heavy machinery induction man moved to the left and rear of the crane, the worker right in front of the crane was not seen by him.
* The operator hung the load, and turned ahead by rotating 180-degrees . Then, since the prospect was good, he started the hanging transportation as it was.
* The operator could not see the worker, since the cabin and machinery was blocking the view of the worker. |
| Account of Concerned Parties |
* The worker knew that he shouldn't enter if the crane started to move, and that he entered the blind area from the operator. But he was quick to enter because of swing of the hanging load. |
| Reason for Adding to DB |
Since the same mistake is not repeated. |
| Scenario |
| Primary Scenario
|
Carelessness, Insufficient Precaution, Misjudgment, Misjudgment of Situation, Poor Value Perception, Poor Safety Awareness, Non-Regular Movement, Movement During Transition, Usage, Operation/Use, Malicious Act, Rule Violation, Bodily Harm, Injury
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| Number of Deaths |
0 |
| Number of Injuries |
1 |
| Field |
Civil Engineering
|
| Author |
KITAJIMA, Munekazu (TEKKEN CORPORATION)
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