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Occupational Safety and Health Administration OSHA

Accident Report Detail

Accident: 200203271 - 19 Employees Are Injured When Canopy Walk Collapses, One Die

Accident: 200203271 -- Report ID: 0418200 -- Event Date: 12/19/2008
InspectionOpen DateSICEstablishment Name
31277009212/19/20081771Southern Decorative Concrete Inc.
InspectionOpen DateSICEstablishment Name
31277029001/12/20093299Forta Corporation
InspectionOpen DateSICEstablishment Name
31277009212/19/20081771Southern Decorative Concrete Inc.
InspectionOpen DateSICEstablishment Name
31277028212/19/20081799Pioneer Concrete Pumping Service, Inc.
InspectionOpen DateSICEstablishment Name
31277030812/19/20081791Williams Erection Company
InspectionOpen DateSICEstablishment Name
31277009212/19/20081771Southern Decorative Concrete Inc.
At approximately 9:00 a.m. on December 19, 2008, Employees were pouring concrete onto a metal decking (walking area) structure for the Atlanta Botanical Garden Canopy Walk construction project. They were working from an elevated structure approximately 400 ft long (compose of several 30 ft sections) and approximately 35 ft from the ground. After pouring approximately 25 to 30 yd of concrete, the structure suddenly collapsed, killing Employee #1 and injuring 19 others, 10 of those employees were hospitalized. Based on the onsite investigation and interviews, noncompliance with the shoring tower design caused the accident. The shoring contractor failed to comply with the design, because three of the steel beams used in shoring towers number 6 and 9 did not meet structural design requirements, and the helical anchor was inadequately embedded in the soil and not braced for shoring towers of 20 ft or greater in height requirement. Additionally, the shoring contractor did not provide the required diagonal cable bracings between the anchors. Anchors with shallow depths would make them highly susceptible to differential settlement and lateral movements. This created the collapse hazard. The shoring contractor had received instructions to provide lateral bracings. Seven anchors under tower number 7 and 8 had embedment depths that varied from 43 in. to 17 in., but none were braced.
Keywords: anchor, shoring, tower, collapse, walk platform
End Use Proj Type Proj Cost Stories NonBldgHt Fatality
Bridge New project or new addition $5,000,000 to $20,000,000 35 X
Employee # Inspection Age Sex Degree Nature Occupation Construction
1 312770092 Hospitalized injury Fracture Concrete and terrazzo finishers FallDist:
FallHt:
Cause: Pouring or installing floor decks
FatCause: Collapse of structure
2 312770092 Hospitalized injury Fracture Carpenters FallDist:
FallHt:
Cause: Pouring or installing floor decks
FatCause: Collapse of structure
3 312770092 Fatality Fracture Carpenters FallDist:
FallHt:
Cause: Pouring or installing floor decks
FatCause: Collapse of structure
4 312770092 Non Hospitalized injury Bruise/Contus/Abras Occupation not reported FallDist:
FallHt:
Cause: Pouring or installing floor decks
FatCause: Collapse of structure
5 312770092 Hospitalized injury Fracture Concrete and terrazzo finishers FallDist:
FallHt:
Cause: Pouring or installing floor decks
FatCause: Collapse of structure
6 312770092 Non Hospitalized injury Cut/Laceration Occupation not reported FallDist:
FallHt:
Cause: Pouring or installing floor decks
FatCause: Collapse of structure
7 312770092 Hospitalized injury Fracture Construction laborers FallDist:
FallHt:
Cause: Pouring or installing floor decks
FatCause: Collapse of structure
8 312770092 Hospitalized injury Fracture Concrete and terrazzo finishers FallDist:
FallHt:
Cause: Pouring or installing floor decks
FatCause: Collapse of structure
9 312770290 Non Hospitalized injury Fracture Occupation not reported FallDist:
FallHt:
Cause:
FatCause:
10 312770092 Non Hospitalized injury Cut/Laceration Occupation not reported FallDist:
FallHt:
Cause: Pouring or installing floor decks
FatCause: Collapse of structure
11 312770092 Non Hospitalized injury Bruise/Contus/Abras Occupation not reported FallDist:
FallHt:
Cause: Pouring or installing floor decks
FatCause: Collapse of structure
12 312770092 Hospitalized injury Fracture Concrete and terrazzo finishers FallDist:
FallHt:
Cause: Pouring or installing floor decks
FatCause: Collapse of structure
13 312770092 Non Hospitalized injury Strain/Sprain Occupation not reported FallDist:
FallHt:
Cause: Pouring or installing floor decks
FatCause: Collapse of structure
14 312770092 Hospitalized injury Fracture Concrete and terrazzo finishers FallDist:
FallHt:
Cause: Pouring or installing floor decks
FatCause: Collapse of structure
15 312770092 Non Hospitalized injury Fracture Occupation not reported FallDist:
FallHt:
Cause: Pouring or installing floor decks
FatCause: Collapse of structure
16 312770092 Non Hospitalized injury Bruise/Contus/Abras Occupation not reported FallDist:
FallHt:
Cause: Pouring or installing floor decks
FatCause: Collapse of structure
17 312770092 Hospitalized injury Fracture Carpenters FallDist:
FallHt:
Cause: Pouring or installing floor decks
FatCause: Collapse of structure
18 312770282 Hospitalized injury Fracture Occupation not reported FallDist:
FallHt:
Cause: Pouring or installing floor decks
FatCause: Collapse of structure
19 312770308 Non Hospitalized injury Bruise/Contus/Abras Occupation not reported FallDist:
FallHt:
Cause: Pouring or installing floor decks
FatCause: Collapse of structure
20 312770092 Hospitalized injury Cut/Laceration Carpenters FallDist:
FallHt:
Cause: Pouring or installing floor decks
FatCause: Collapse of structure

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