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Occupational Safety and Health Administration OSHA

Accident Report Detail

Accident: 200997484 - Employee Is Killed When Struck By Matted Bridge

Accident: 200997484 -- Report ID: 0551800 -- Event Date: 04/01/2009
InspectionOpen DateSICEstablishment Name
31265585504/02/20091623Sheehan Pipeline Construction
On April 1, 2009, Employee #1, a machine operator, was directing the placement of equipment mats along a wetland area. Each mat weighs between 2,500 lbs to 3,500 lbs and is constructed from timbers measuring approximately 18 feet long by 4 feet wide. Additionally, each mat contains four to six timbers, which are secured together by the use of a one inch bolt/rod. The bolts/rods are placed at four locations, spaced along the length of the mat. An exposed section of the bolt/rod is left at the end of the mats to assist with their placement through the use of a hook. The mats were to be used to support a John Henry drill machine, which Employee #1 was intended to use to drill holes for explosive charges in rocky areas. While Employee #1 was directing the placement of the mats, a Caterpillar excavator, Model Number 330D, was being used to transport and place the mats. The excavator was also equipped with a standard bucket, Type 269-2693, with a four tip constructed bite width of 42 inches, and a weight capacity of 1.54 cubic yards. On the backside of the bucket, an eyelet, with a load rating of approximately 20 tons, existed where a 10-inch Crosby shackle (rated at 17 tons) was fastened. Then attached to the 10-inch shackle was an 8.5 inch Crosby shackle, rated at 12 tons. Finally, a swivel hook with a working load of 11 tons, Model Number S-3322, is then attached to the 8.5 inch shackle. Five out of six mats were successfully put into place; however, as the fifth mat, the sixth mat required to be lifted up and over a slit fence that was located near a ditch. As the excavator operator transported the last mat, the equipment bounced, causing the mat to come into contact with the ground. The mat disengaged from the hook and struck Employee #1, killing him. The accident investigation revealed that other workers, in addition to Employee #1, were exposed to the suspended load created during the transporting and placing of the mats while attaching and detaching the hooks.
Keywords: hoisting mechanism, unsecured, equipment operator, suspended load, back, crushed, excavator, mech mat handling, struck by, unstable load
End Use Proj Type Proj Cost Stories NonBldgHt Fatality
Pipeline New project or new addition $20,000,000 and over X
Employee # Inspection Age Sex Degree Nature Occupation Construction
1 312655855 Fatality Other Occupation not reported FallDist:
FallHt:
Cause:
FatCause: Struck by falling object/projectile

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