Bridge building advice wanted

[lincolnboy]

If you use steel I beams, I would weld in runners and use extruded metal grate

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you will want to brace those i beam jusy the black said, weld a frame on top of the beM

[lincolnboy]

one thing i dont know about is if the ibeams come with a load bearing or not, meaning will the beam come with an arch so when you put all the load on top of them the ibeam start to straighten out slme

[SOLOW55]

What about using a old mobile home frame ?