• Dropped Objects (DROPS)

  Worker Fatality During Trench Box Dismantling

  Posted by Nigel on 19 December 2020 at 4:14 pm

  Energy safe Canada reported a work crew was on location to dismantle a high arch trench box and then transport the disassembled box from one project work site to another.

  The disassembly process did not follow the manufacturer’s instructions for the safe removal of the strut support pins holding the box together.

  Consequently, when the last strut support pin was removed from the box, it collapsed, causing a support arch to strike and fatally injure a worker.

  Lessons Learned:

  Trench boxes are a protective system used to protect workers from the pressure and weight of soil in the event of a cave-in. It is critical to ensure that processes are followed to prevent unexpected movement of trench box panels which can cause serious harm or death. Not all trench boxes are the same – identify and know the specifications for the equipment that is being used.

  What did they learn? What were the recommendations:

  Ensure supervisors, workers and inspectors are trained in the use and inspection of the specific trench box being used. All trench box systems come with assembly, use and disassembly instructions. Always follow the manufacturer’s instructions.

  The installation, removal, assembly and disassembly of any trench box must only be done by a competent and qualified person(s) including workers, supervisors and inspectors.

  Never stand in the line of fire and before starting any job, make sure everyone on site is positioned in an area away from the task to avoid contact with moving objects, vehicles, pressure releases and potential dropped objects

  

  Nigel replied 3 years, 4 months ago 1 Member · 0 Replies
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