| Case Name |
Working with the exceeding load, the crane turns sideways. |
| Pictograph |
|
| Date |
1983 |
| Place |
Aichi Prefecture. |
| Location |
River work fields. |
| Overview |
Because there was no place to post the outrigger, they suspended the steel sheet by the crane of 20t rated load without posting it and then the crane rolled sideways during rotation. A worker was died under the boom. |
| Incident |
The transportable crane turned sideways because they did not post the outrigger, and the worker who was working near died under the boom. |
| Sequence |
An operation to move the transported steel sheets down to the place under the bank by using a transportable crane(Rated load was 20t) driven by the secondary subcontractor's worker.The crane was put on the place directed by the foreman of the contractor. Because this place was the 4m width,they started the work by the sign of the organizer of the subcontractor,without posting the outrigger.The time the acciden happened was when the workers were directed to move the steel sheets to the place of 17m's distance from the crane. They gradually bent the boom of crane to 45° .The organizer suspended a steel sheet(192kg) and the crane began to roll, slightly before putting the sheet,the crane rolled sideways. So the boom of the 27m's length was crushed on the ground, a worker working near the crane died under the boom. |
| Cause |
The work was executed over the rated load.
Without posting the outrigger.
Worker in the crane's working range.
The danger was recognized by the driver of the crane but it was not told to the organizer. |
| Countermeasures |
Re-check the chain of commands and let everyone tell their opinions everytime.
Re-check the process of the work and think the safe work methods that suits the circumstance.
Keep workers out of the Crane's work range,and do the safety education and training to the workers. |
| Knowledge Comment |
Keep out of the crane's rolling range.
Works thought to be danger must not be done after the confirmation of the safety.
Works must be planned according to the safety before execution.
It is possible that a crane rolls sideways due to the miss operation. |
| Background |
The lack of the safety and sanitation education.
The atmosphere that the bottom person of the chain of commands feels the difficulty to show his opinion.
The shortness of the managemt of the foreman. |
| Sequel |
The driver of the crane felt danger but the direction was from the organizer, so he thought he can manage it. |
| Scenario |
| Primary Scenario
|
Insufficient Analysis or Research, Insufficient Prior Research, Ignorance, Insufficient Knowledge, Misjudgment, Misunderstanding, Organizational Problems, Inflexible Management Structure, Regular Operation, Nonobservance of Procedure, Usage, Operation/Use, Regular Operation, Nonobservance of Procedure, Malicious Act, Rule Violation, Failure, Large-Scale Damage, Bodily Harm, Death
|
|
| Sources |
Disaster case, KENSAIBOU Aichi. VOL.S58.3.1
|
| Number of Deaths |
1 |
| Field |
Civil Engineering
|
| Author |
IKAI, Seiji (ICHITEC CORPORATION)
BABA, Kanji (ICHITEC CORPORATION)
|
