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Occupational Safety and Health Administration OSHA

Inspection Detail

Inspection: 312770282 - Pioneer Concrete Pumping Service, Inc.

Inspection Information - Office: Atlanta West

Nr: 312770282Report ID: 0418200Open Date: 12/19/2008

Pioneer Concrete Pumping Service, Inc.
1345 Piedmont Ave Ne
Atlanta, GA 30309
Union Status: NonUnion
SIC: 1799/Special Trade Contractors, Not Elsewhere Classified
NAICS: 238990/All Other Specialty Trade Contractors
Mailing: 4791 Wright Dr., Smyrna, GA 30082

Inspection Type:Prog Related
Scope:Partial Advanced Notice:N
Safety/Health:Safety Close Conference:06/15/2009
Close Case:06/15/2009

Related Activity:TypeIDSafetyHealth

Accident Investigation Summary
Summary Nr: 200203271Event: 12/19/200819 Employees Are Injured When Canopy Walk Collapses, One Die
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
Inspection Degree Nature Occupation
1 312770282 Hospitalized injury Fracture Occupation not reported

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