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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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Ping RCM structural engineers...
Attention all bored structural engineers, I need assistance assessing the viability, and if viable refining the design of some heavy lift apparatus. I'm trying to design a lift system that can lift a loaded (up to 60k#) ISO intermodal cargo container 4'+ vertically so that a container chassis or regular flatbed trailer can be backed under it for loading/unloading similar to the way "slide in" truck campers are loaded and unloaded. A further complication is that the lift unit should be able to break down into components that are not more than about 150# each, and be able to be assembled and disassembled by one person in a reasonable amount of time, say 1hr. The lift unit can not get in the way of the lower corner points of the container so that it can be raised/lowered from a normal chassis with corner locks. I've worked up a rough concept that looks like it could meet these criteria: http://wpnet.us/container_lift.jpg Essentially is it two lift leg left/right pairs that attach to the top lift points on the container, and rest with an angle plate at the corners of the container perhaps a foot up from the bottom. The angle plates have tabs on them that connect to shackles and chain assemblies which use turnbuckle type load binders to pull the angle plates solidly against the container frame. The legs are set at a small angle (5 deg or less), to provide clearance for the trailer to be backed underneath. The chains and binders fit in the under 150# criteria. The lift legs should meet the weight criteria when disassembled into the outer tube, inner tube and hydraulic cylinder components, so that those components can be assembled while horizontal on the ground and then the unit raised into place using a ratchet chain hoist or similar. I own a 40' container and several friends of mine also own similar containers. Moving these containers typically requires an expensive crane and/or an expensive "Landol" style tilt bed trailer. With a lift system like this the savings in being able to readily load/unload from an ordinary flatbed trailer or container chassis would add up pretty quickly. Thoughts, comments, suggestions? Thanks, Pete C. |
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