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Occupational Safety and Health Administration OSHA

Accident Report Detail

Accident: 202447413 - Employee Injured When Crushed By Collapsing Concrete Wall

Accident: 202447413 -- Report ID: 0950633 -- Event Date: 08/09/2007
InspectionOpen DateSICEstablishment Name
31059987308/10/20071622Washington Group International Obayashi Corporatio
At approximately 7:15 a.m. on August 9, 2007, Employee #1 and a coworker were stripping the interior form work of a 15 ft long by 8 ft deep by 3 ft wide by 8 in. thick, type G-2 drainage inlet structure. They were doing this while the cement slurry backfill was being poured between the excavation wall and the north wall of the inlet structure. Two trucks, each carrying 10 cubic yards of the slurry, had already poured in their contents. When the third truck pour was in progress, the north wall developed vertical cracks and pushed toward the south wall of the inlet structure, crushing Employee #1 against the south wall. He sustained numerous bodily injuries. The coworker was able to climb out safely.
Keywords: concrete form work, excavation, wall, concrete truck, unsecured, pinned, work rules, construction, vibrations, crushed
End Use Proj Type Proj Cost Stories NonBldgHt Fatality
Highway, road, street New project or new addition $50,000 to $250,000
Employee # Inspection Age Sex Degree Nature Occupation Construction
1 310599873 Hospitalized injury Fracture Brickmasons and stonemasons apprentices FallDist:
Cause: Backfilling and compacting
FatCause: Collapse of structure

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