Workers Crushed While Unloading Waste Container Hazard Alert

Topic: Workers Crushed While Unloading Waste Container
Date Issued: April 1, 2005 Date Revised:

Two operators of waste compacting units were injured, one fatally, in separate incidents when they were crushed by a container being unloaded. During normal operation, the truck backs up to the waste container and attaches a cable to the container. A winch pulls the container toward the truck so that its trunnion bar drops into the holding brackets located at the rear of the unit. The safety bars are then locked in place to hold the trunnion bar in position. As the winch raises the container, the container pivots on the trunnion bar and the garbage is transferred from the container to the compacting unit.

In both cases, our investigations concluded that the trunnion bar on one side of the container escaped its holding bracket. Unsupported on one side, the container dropped to the ground. The container rotated on the fallen trunnion bar, releasing the second trunnion bar. The container then swung freely and struck the side of the garbage truck. In one case, the trunnion bar on the container had appropriate washers welded to the end of the trunnion bar; however, the safety bars had not been engaged.

In the case of the fatality, the safety bars were engaged; however, there were no washers on the end of the trunnion bars. A severe jolt, caused by a heavy drum unloading into the truck, raised one side of the washerless trunnion bar high enough that it escaped the safety bar, resulting in the operator being crushed.

Recommended Preventive Action

  1. Never try to empty the container into the compacting unit unless:
    1. The safety bars are locked in place.
    2. The container trunnion bar has appropriate washers or other safety devices to prevent the bar from escaping the holding brackets during unloading.
  2. Both the truck and compacting unit require regular maintenance to ensure proper equipment operation. This should include, but not be limited to, the winch, cable, hook, safety bars, hydraulic system and any attachments.
  3. Operators must inspect their unit daily and must report equipment deficiencies to their employer.
  4. Operators of such equipment must receive training on the unit as per the operator’s manual.
  5. Operators should look out for overhead power lines when dumping or moving large containers.
  6. Operators should inspect container contents to verify for distribution of waste and large objects.

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