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Thread: spreader bar help

  1. #1
    Associate Engineer
    Join Date
    Mar 2016

    spreader bar help

    Just wondering if anyone could help me with the design of this lifting frame . see attached.
    It is for lifting boats. Will be used below a 4 leg chain. The drawing shows the opposing chain legs at 90 degrees I can use longer chains and reduce that angle to 60 degrees if it would significantly reduce steel section I need and overall weight of the frame. vertical force on each of the 4 corners is 8 metric tonnes, total lift of 32 tonnes. frame size 4M x 3M.
    Any help much appreciated
    Attached Images Attached Images

  2. #2
    Technical Fellow jboggs's Avatar
    Join Date
    Mar 2011
    Myrtle Beach, SC
    You will get a better response with specific questions rather than a general request for assistance. Do you know how to calculate the actual loading on the various segments of steel and cable?

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