OSHA Accident Investigation · Summary #744912
JOIST,ROOF,POURING,BOOM,CONSTRUCTION,WELDING,LACERATION,PUMP,CONCRETE,CONTUSION
Event description
FOUR EMPLOYEES INJURED WHEN BAR JOISTS DISLODGE
Investigation abstract
On October 13, 1989, a second-level subcontractor and a first-level subcontracto did not weld them to the support beams. The joists were mostly spaced 4 ft thus plumbing and welding could have preceded the pour. The ironworkers declined to w ork above them. On the morning of the pour, the first-level subcontractor remove d enough roll bars to move one joist in each bay to increase the opening for the concrete hose, which had a flanged coupling 10 ft from the discharge end. The b oom operator was on the same floor but at a distance from the concrete crew. Mov ing the hose discharge end for about two hours, the pour had reached the center of the floor. The hose either bounced or was being raised and, as a result, thre e adjacent 20-feet joists were dislodged, 140 lb each, and one end dropped the o ther partly supported by roll bars. Three subcontractors sustained light injurie r for installing the Hambro D-500 Concrete Floor Roof System were pouring and fi s and one subcontractor sustained a bit more serious injury, so the work stopped . The concrete set before concrete removal began on another day. The ironworkers reset, plumbed, and welded all the joists in about two hours. nishing one wing of the fifth floor on a five-story office building. This wing w as 140 ft by 80 ft. The columns and reams for the roof were set dividing the are a into two bays and two outside rows of seven bays 20 ft by 30 ft and a center r ow of seven bays 20 ft by 20 ft. The subcontractors were using a concrete pump t ruck with boom and hose from above. Before the pour started, the other second-le vel subcontractors, ironworkers, had set all the roof bar joists. The workers sp aced and locked the roof bar joists with a Hambro roll bar at each end but they
Victims (4)
-
#1 Hospitalized Age 38 M
- Nature of injury
- 3
- Part of body
- 21
- Event type
- 1
- Source
- 8
- Occupation code
- 588
- Human factor
- 1
- Environmental factor
- 6
- Task assigned
- 1
-
#2 Hospitalized Age 41 M
- Nature of injury
- 7
- Part of body
- 9
- Event type
- 1
- Source
- 8
- Occupation code
- 588
- Human factor
- 1
- Environmental factor
- 6
- Task assigned
- 1
-
#3 Hospitalized Age 60 M
- Nature of injury
- 3
- Part of body
- 2
- Event type
- 1
- Source
- 8
- Occupation code
- 588
- Human factor
- 1
- Environmental factor
- 6
- Task assigned
- 1
-
#4 Hospitalized Age 32 M
- Nature of injury
- 9
- Part of body
- 2
- Event type
- 1
- Source
- 8
- Occupation code
- 869
- Human factor
- 1
- Environmental factor
- 6
- 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.