OSHA Accident Investigation · Summary #707331
OUTRIGGER,WORK RULES,MOBILE CRANE,CONSTRUCTION,CRANE,OVERTURN,UNSTABLE POSITION
Event description
CRANE OVERTURNED; OUTRIGGERS NOT FULLY EXTENDED
Investigation abstract
A GROVE 35 TON MOBILE CRANE HAD BEEN SET UP TO MOVE PLYWOOD SHEETS INTO AN EXCAV HE CRANE WEDGED ITSELF AGAINST AN EXISTING BUILDING, WHICH KEPT IT FROM FALLING INTO THE EXCAVATION. IF TIME HAD BEEN TAKEN TO CLEAR THE AREA OF MATERIALS, AND THE OUTRIGGERS HAD BEEN FULLY EXTENDED, IT IS DOUBTFUL THAT THE ACCIDENT WOULD H AVE OCCURRED. THE EMPLOYER WILL BE CITED FOR FAILURE TO COMPLY WITH MANUFACTURER 'S OPERATING PROCEDURES. ATION. THE BOOM HAD TO BE EXTENDED 85 TO 90 FEET (OUT OF A POSSIBLE 104 FEET) TO DO THE WORK. ON THE FIRST LIFT, THE CRANE WAS LIFTING 6 SHEETS OF PLYWOOD WITH THE BOOM AT ABOUT A 60 TO 65% ANGLE. THE OUTRIGGERS WERE EMPLACED, BUT NOT FULLY EXTENDED. THE CRANE OPERATOR EXPERIENCED A "CREEPING" SENSATION, WHICH CAUSED H IM TO DISMOUNT THE CRANE AND CHECK THE OUTRIGGERS. HE FOUND THAT THEY WERE ALL I N CONTACT WITH THE GROUND. HE RESUMED THE LIFT, BUT AGAIN EXPERIENCED THE CREEPI NG SENSATION. HE STARTED TO PULL THE BOOM IN, BUT WITHIN 30 SECONDS THE CRANE TI PPED OVER TOWARD THE EXCAVATION. THE OPERATOR JUMPED FREE AND WAS NOT INJURED. T
Victim
-
#1 Non-hospitalized injury Age 31 M
- Nature of injury
- 14
- Part of body
- 14
- Event type
- 14
- Source
- 14
- Occupation code
- 424
- Human factor
- 4
- Environmental factor
- 8
- Task assigned
- 1
Codes shown verbatim from OSHA's accident-investigation database. A human-readable decoder is coming in a future release once the accident_lookup2 dictionary is loaded.