OSHA Accident Investigation · Summary #14438964
REPAIR,COLLAPSE,UNSECURED,TOWER CRANE,WORK RULES,MOBILE CRANE,CONSTRUCTION,OVERTURN
Event description
Employee injured when crane tips over
Investigation abstract
On February 19, 1990, Employees #1 through #4 were making a minor repair to a mo he tower fell forward it caught the slack in the cable, resulting in shock loadi ng 30,000 lb, which caused the crane to tip over and collapse. Employee #1 was h ospitalized. bile tower crane that had collapsed. They were attempting to reset a hydraulic a ssist arm for the gantry back into the track where it belonged. To perform this task, the gantry had to be unpinned and raised. The boom-down control is also us ed to lower the tower when the gantry is raised and repinned. The owner's manual is clear that when the gantry is unpinned, the stay-back arms must never be unp inned. Employee #2, the operator, told Employees #1, #3, and #4 to remove the st ay-back arm pins and then unpin the gantry. When Employee #2 went to raise the g antry, by using the boom-down control, the tower started to fall forward. When t
Victims (4)
-
#1 Hospitalized Age 31 M
- Nature of injury
- 12
- Part of body
- 3
- Event type
- 6
- Source
- 24
- Occupation code
- 999
- Human factor
- 9
- Environmental factor
- 8
- Task assigned
- 2
-
#2 Non-hospitalized injury Age 40 M
- Nature of injury
- 21
- Part of body
- 31
- Event type
- 14
- Source
- 24
- Occupation code
- 999
- Human factor
- 9
- Environmental factor
- 8
- Task assigned
- 1
-
#3 Non-hospitalized injury Age 29 M
- Nature of injury
- 20
- Part of body
- 16
- Event type
- 5
- Source
- 24
- Occupation code
- 999
- Human factor
- 9
- Environmental factor
- 8
- Task assigned
- 2
-
#4 Non-hospitalized injury Age 30 M
- Nature of injury
- 20
- Part of body
- 5
- Event type
- 6
- Source
- 24
- Occupation code
- 999
- Human factor
- 9
- Environmental factor
- 8
- Task assigned
- 2
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