OSHA Accident Investigation · Summary #690958
ERECTION PROCESS,STEEL,CONSTRUCTION,STEEL ERECTION,TOWER
Event description
FALL FROM STEEL TOWER
Investigation abstract
EMPLOYEE #1 WAS PART OF THE ERECTION CREW WHOSE JOB IT IS TO CONNECT A TOWER OF E #1 WAS MAKING THE DOWN AISLE SUPPORT ARM CONNECTIONS WHENSHE UNDONE THE NUTS O N THE SUPPORT ARM ABOVE HER, THE ARM WAS ONLY CONNECTED ON THE END WHERE THE NUT S WERE REMOVED. THIS ALLOWED THE 30-50LBS ARM TO FALL. THE EMPLOYEE WAS WORKING 25' ABOVE THE GROUND AND HADNOT TIED HER SAFETY BELT AND LANYARD OFF. SHE FELL T O THE CONCRETE FLOORBELOW BREAKING HER ARMS, FEET AND PELVIS AN AUTOMATED RETRIEVAL SYSTEM. A TOWER IS TWO SETS OF UPRIGHTS 80 FEET TALL WITH 12 DOWN AISLE SUPPORT ARMS THAT ARE ERECTED ON SITE. THE UPRIGHTS WITH THE DOWN AISLE ARMS ARE SET IN PLACE WITH A CRANE. WHILE THE UPRIGHTS ARE STILL SUPPORTE D BY THE CRANE, T HE ERECTION CREW CONNECTS SOME OF THE DOWN AISLE SUPPORT ARMS TO THE UPRIGHTS THAT ARE SET. WHEN THE UPRIGHT IS SECURED IN PLACED THE CRANE IS UNHOOKED SO THAT IT CAN PICK UP ANOTHER UPRIGHT. AT THIS TIME THE ERECTION CREW WILLCONNECT THE DOWN AISLE SUPPORT ARMS THAT WERE NOT CONNECTED THE FIRST TIME. THE DOWN AISLE ARMS ARE CONNECTED TO THE UPRIGHTS BY 6" BOLTS AND NUTS. EMPLOYE
Victim
-
#1 Hospitalized Age 32 F
- Nature of injury
- 12
- Part of body
- 19
- Event type
- 5
- Source
- 8
- Occupation code
- 597
- Human factor
- 20
- Environmental factor
- 5
- 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.