OSHA Accident Investigation · Summary #745430
PPE,WORK RULES,UNTRAINED,FRACTURE,TRUSS,INSTALLING,COLLAPSE,CONSTRUCTION,BACK,FALL PROTECTION
Event description
Two employees injured in fall with collapsing trusses
Investigation abstract
Employees #1 and #2 were installing scissor roof trusses. The crane had been poo he floor-to-truss brace fractured and the plywood strip bracing the top chord br oke away from the nails. Employee #1 and trusses #1 and #2 fell approximately 31 ft from the side of the building to a soft backfilled area. Employee #2 fell ap proximately 12 ft to the second floor level. Employee #1 suffered from a fractur ed thoracic vertebra and a fractured wrist. Employee #2 was transported to the h ospital with minor injuries. Causal factors included: failure to install the end wall truss; failure to install temporary lateral bracing of the bottom chord; i nadequate temporary lateral bracing of the top chord plane (they should have use d at least 2 by 4s), and failure to install a lateral brace in the opposing dire ction from that of the floor-to truss-brace. None of the employees had received rly positioned and could not raise the plywood sheathed end truss into place. Tr hazard recognition training or training in the Truss Plate Institute's standards recommendations. None of the employees wore hard hats or were provided with or wore safety belts and lanyards. uss #1, placed approximately 23 in. from the end wall, was nailed to the front a nd rear walls and a brace (two overlapping 2 by 6's) was attached to the center vertical web member and the floor. Truss #2 was also attached to the front and r ear walls, and a top chord lateral brace, consisting of 3/4 in. thick plywood 3 in. wide by 25 1/2 in. long, was nailed to truss #1 and #2 near the peak. Employ ee #1 was standing on the truss and Employee #2 was probably standing on the flo or-to-truss brace. While trusses #3 and #4 were being unhooked from the crane, t
Victims (3)
-
#1 Hospitalized Age 27 M
- Nature of injury
- 12
- Part of body
- 19
- Event type
- 5
- Source
- 8
- Occupation code
- 567
- Human factor
- 1
- Environmental factor
- 6
- Task assigned
- 1
-
#2 Non-hospitalized injury Age 25 M
- Nature of injury
- 20
- Part of body
- 16
- Event type
- 1
- Source
- 8
- Occupation code
- 567
- Human factor
- 1
- Environmental factor
- 6
- Task assigned
- 1
-
#981 Degree 0 Age 0
- Nature of injury
- 0
- Part of body
- 0
- Event type
- 0
- Source
- 0
- Occupation code
- 0
- Human factor
- 0
- Environmental factor
- 0
- Task assigned
- 0
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.