I made a fence from logs. In the future, this place is planned for keeping one piglet.
I had some logs, I shaved the bark off them, concreted two old iron channels into the ground, welded a gate, then drilled these channels and logs and screwed them with steel studs onto nuts. Although the main mass of the fence is not held on the channels, but on the lower log, which lies on a concrete base near the channels. I don't know how long this fence will last, but it cost me absolutely nothing.
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The channels are buried more than a meter into the ground, so the fence should not fall.