OSHA Accident Investigation · Summary #14296347
TRUSS,INSTALLING,COLLAPSE,WORK RULES,CONSTRUCTION,FALL,BRACING,FALLING OBJECT
Event description
Employee struck by falling trusses in townhouse
Investigation abstract
At about 10:00 a.m. on July 2, 1986, Employee #1 was part of a crew that was con t wooden trusses installed, each weighing 218 lb, and having a 6:12 pitch. They were designed in compliance with the Truss Plate Institute's specification, TPI 1978. An investigation revealed that during the erection and bracing of the trus ses the employer had not complied with the recommendations of the Truss Plate In stitute for installing wooden roof trusses, specifically lateral and diagonal br acing of the three places of reference in a roof system to ensure stability: top chord, web member, and bottom chord. The collapse of the trusses is directly at tributable to the failure to comply with the bracing recommendations of the Trus s Plate Institute. The employer does provide ppe as needed. structing an 8-unit townhouse. The units, from west to east, were numbered 49 th rough 56. Employee #1 was on a truss on unit 51, and two coworkers were on a tru ss on unit 50. Employees were installing pieces of lateral bracing in preparatio n for the installation of roof sheeting. One of the coworkers on the unit 50 tru ss and Employee #1 saw the north (roof) wall of unit 51, the bearing support for the trusses, fall to the ground. This caused all the trusses of units 51 throug h 56 to collapse to the second floor in a domino effect. Employee #1 fell to the second floor and was struck by the falling trusses. Each unit had eleven 34 foo
Victim
-
#1 Non-hospitalized injury Age 20 M
- Nature of injury
- 21
- Part of body
- 31
- Event type
- 1
- Source
- 8
- Occupation code
- 567
- Human factor
- 1
- Environmental factor
- 13
- Task assigned
- 1
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