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We built a 60'x104' horse riding arena barn 4 years ago almost by ourselves (some help on the roofing). We don't have a concrete floor, but you set the poles in the same manner whether concrete is added or not. I rented a bobcat with an 18" auger bit, and dug 36 holes 48" deep along a plumb line. We then nailed 2'x6' "windstay" blocks onto all 4 side of the bottom of the 6'x6' posts, and set them into the ground with 3 bags of concrete/water/couple inches of dirt. The wind stays are in place to prevent a strong wind/tornado from sucking the smooth posts out of the ground. That barn is complete now, and strong as hell, along with being perfectly straight looking down the sides.
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