At the Waste Treatment Plant during a recent attempt to extract a cylinder trench shield from a backfilled excavation, the forklift rigging assembly failed due to excessive stress on the welded hook attachment. Although the techniques used had been successful in the past, the cylinder trench shields overall weight was compounded by compacted soil and friction from the inside. The end result was that the effective loading on the rigging assembly exceeded its capacity. LESSON LEARNED: Failure to pause and reassess when the initial lifting attempt did not work resulted in damaged equipment (i.e., forklift tine support bar, rigging apparatus) and could have also caused injury to personnel.
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