Keep in mind that concrete is very strong in compression but weak in tension. Steel reinforcements are added to concrete to carry the tension loads and prevent the concrete from pulling apart. Look where the concrete is most likely to pull apart and add steel to those locations, (most likely where it is bending in tension and around the perimeters).
A pier will likely be carrying a vertical compression load pushing it down into the ground rather than any vertical tension trying to pull it out of the ground. So there should be little need for vertical reinforcement, mostly for horizontal reinforcements and just enough vertical supports to keep the horizontal rings in position during concrete pouring.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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