You could cut just pour a slab with this piece hanging half way in it. Drill a plate (thick steel) that you have drilled to suit your mount, and bolt it to the top using the existing flange. Simple, and pretty cheap.
It looks like 6 inch diameter pipe with plain flanges welded on, so with any real weight it will be a bit flexy. But, if it's cheap, and you're not hanging too much off it, it should be worth the effort.
Cheers,
Jason.
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