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SECTION III: MATERIAL HANDLING ACCIDENTS
Summary No. 5 - Defective Spreader Bar
Employees were exposed to the hazard of being struck by the I-beam spreader bar that disengaged from a bridge crane.
A bridge crane with an I-beam spreader bar is used to load bags of grain into a lash barge.
Activity at time of incident:
Longshoremen in the barge were re-hooking synthetic slings to the crane's spreader bar. The slings had been used to secure bags of grain during loading into the barge.
A lash barge is moored to the dock and a crew of longshoremen is loading bags of grain (corn-soy blend) into the barge. The crew consists of a crane operator, a forklift operator, and one laborer working on the loading dock, and five laborers working inside the barge positioning the cargo. The operation is supervised by a superintendent and the crew foreman.
A 15-ton bridge crane, equipped with a 2,500-pound I-beam spreader bar, is used to transfer the bags of grain from the dock into the barge. The spreader bar is constructed of 3/8-inch plated steel, and is 18.5 ft long and 21 inches high. It is rigged with eight wire ropes, which are each eight feet long and fitted with hooks. The forklift operator places the 55-pound bags of grain onto the dock, where they are stacked in groups of 40 bags and secured in synthetic slings. The synthetic slings around each stack are then hooked to the wire ropes on the crane's spreader bar, and the crane loads eight stacks at one time into the barge. Each load contains a total of 320 bags and weighs 17,636 pounds. Once the stacks are placed in the barge, the crew in the hold removes the synthetic slings around the stacks, first unfastening the snaps on the synthetic slings and then reattaching the slings to the crane's spreader bar hooks on just one side. The crane operator then raises the hoist, and the synthetic slings are pulled away from the cargo.
One set of synthetic slings had been successfully removed from a stack and three of the laborers in the barge were setting up the spreader bar to remove another set of slings. The laborers were rehooking the synthetic slings to the spreader bar, when the spreader bar fell from the crane's hoist. The spreader bar landed on top of one laborer and struck a second laborer in the head and torso as he attempted to run out of the way. Both employees struck by the spreader bar were killed. The third longshoreman was able to move out of the way of the spreader bar and was not injured.
The crane had not been subjected to daily or monthly inspections. No designated individual conducted inspections of the crane or the crane's components. Supervisory accident prevention training was not provided. The investigation revealed that a 5/8-inch wire rope (presumably rigged to the crane) was completely severed and both ends were badly frayed, attributed to progressive wear-and-tear rather than sudden breakage. Additionally, the top of the crane block was damaged and the sheaves on the block were out of alignment.
The company's safety rules warned the crane operator not to perform lifts over people's heads, and numerous signs posted at the site warned employees of the dangers of the overhead crane.
Signs indicating telephone numbers of emergency personnel were not posted in a conspicuous location. Additionally, not all of the areas around the barges were protected with safety nets or other fall protection, exposing employees to fall and drowning hazards.
Applicable Standards and Control Measures
Moreover, the employer should have established and enforced crane safety rules, such as the guidelines set forth in ANSI B30.2, Overhead and Gantry Cranes.
This hazard may have been prevented if an appropriately qualified individual had been designated to perform regular daily inspections of each crane in use, as set forth in 29 CFR 1917.45(k)(1), and to perform crane inspections at monthly intervals, as set forth in 29 CFR 1917.45(k)(2). Defects, such as the frayed wire rope, may have been identified during the course of such an inspection and repaired before creating a serious hazard. In the case of defects that could affect the safe operation of the crane, the crane should have been taken out of service until the defect was corrected.
Page last updated: 04/13/2010