| Case Name |
A dump trailer crashed into bridge girder when moving with its dumper raised |
| Pictograph |
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| Location |
The river improvement works field |
| Overview |
The distance from the excavation point to the unload point was about 2.5 km, and a national road (second grade, 8 m width) was 0.5 km short of the unload point. The truck travelled with its dumper raised after unloading its burden, and crashed into the bridge girder. |
| Incident |
A dumper trailer crashed into bridge girder when moving with its dumper raised. |
| Sequence |
* The road was in such a good condition, being 10 m width and its surface having been improved, that the dump trailer could go at the speed of about 40 km/h.
* Though the colleague gave him some signal just before the accident occurrence, he did not notice it and continued regardless.
* The dump trailer crashed into the bridge girder and was damaged. On another front, the driver fractured his chest, and, as a result, he lost 4-weeks worktime. |
| Cause |
* The victim started driving without confirming the letdown of the dump trailer's bed.
* He missed his colleague's signal.
* He was using his cellar phone.
* He did not accustom himself to the field because he had entered the field just 4 days before.
* The driver was 56-year-old, and he was a little deaf.
* There was no such facilities telling "the vessel rising", just as a lamp, buzzer or rotation light.
* No signboard or portal gate in the dangerous place was installed. |
| Countermeasures |
* Drivers should set off after confirming the letdown of the trailer's dumper by pointing at it and calling it, etc.
* Warning equipment informing drivers of the raised dumper such as a warning sound and lamps are required.
* We should set a gate and an operator who is suposed to inform drivers of the condition of the dumper |
| Knowledge Comment |
* We should establish a sufficient system of surveillance in case of the work by constructional machineries.
* The use of the cellar phone while driving must be prohibited. |
| Background |
In this site, the fundamental operational procedure was not observed. For example, the workmanship instruction to the new worker was exactly the same as the worker who has done the same work for a long time, the notices for the work through the day were not given in morning gathering, and so on. At both the loading point and unloading point, there was a tendency to start too early when crowded. The management system throughout the site is essential |
| Reason for Adding to DB |
This is a typical case caused by human careless absentmindness. |
| Scenario |
| Primary Scenario
|
Carelessness, Insufficient Precaution, Carelessness, Insufficient Understanding, Ignorance of Procedure, Disregard of Procedure, Poor Value Perception, Poor Safety Awareness, Organizational Problems, Poor Management, Regular Operation, Nonobservance of Procedure, Regular Movement, Dangerous Movement, Failure, Fracture/Damage, Bodily Harm, Injury
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| Number of Injuries |
1 |
| Physical Damage |
Dump trailer |
| Financial Cost |
About 4,500,000 yen for repairing |
| Field |
Civil Engineering
|
| Author |
HOJO, Tetsuo (Institute of Technologists)
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