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  1. kfc510

    Minimum width #7 hairpin

    Here's the tag from the delivery last October, for S's and G's. The 11" is outside-to-outside, the manager at the fabricator always says the true bar diameter is 1/8" greater than nominal diameter.
  2. kfc510

    Minimum width #7 hairpin

    That's the current story from the fabricator, BridgeSmith, though it is contradicted by the previously delivered U bar shown in the first pic which was #7 with a 9" inside-to-inside dimension. Also, Ron posted above that the minimum 12d was a crsi requirement, but I haven't seen the citation...
  3. kfc510

    Minimum width #7 hairpin

    The last pic is a single 180, hence the Michaelangelo work at the footing... The first pic is twin 90s. It's also the same bar wrapped snugly around the blue column.
  4. kfc510

    Minimum width #7 hairpin

    The weird thing is last october they delivered the pair in the first pic, with two 90 degree corners and ~9" spread. Either they cheated on the corner diameter that time (I didn't check, and those pieces are buried like Jimmy Hoffa now), or they found a trick, or something. Now in 2021...
  5. kfc510

    Minimum width #7 hairpin

    PhamENG, that's my guess as well, but it's just a guess. They're a legit operation, I should probably just listen to them. Here's a couple of their monster bending tables
  6. kfc510

    Minimum width #7 hairpin

    The last time this came up the fabricator wanted to do a 180 with a 9" pin, which worked fine in that case as the column was far away from the existing footing. When the column is located very close to the existing footing the extra protrusion of the single bend U exacerbates a loud...
  7. kfc510

    Minimum width #7 hairpin

    Dik, it's meant to fully surround a moment column embedded in a grade beam. Full disclosure- I'm not the engineer, I'm the ditch-digger.
  8. kfc510

    Minimum width #7 hairpin

    I understand the minimum diameter (5 1/4" in this case) pin for the corner bends, I just don't understand the 12d minimum width across. I'm conceptually struggling with the idea that the bend from one corner is somehow continuing along the "belly", or short piece, on the end past the radii...
  9. kfc510

    Minimum width #7 hairpin

    Rebar fabricator is saying I need a minimum inside dimension of 10 1/2" (2x the corner bend diameter) for a set of #7 hairpins with 90 degree bends at the belly. I'm trying to understand why they're saying that. Any pointers? Similar bars shown in pic. thanks...

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