Anchor rod threads too high
Anchor rod threads too high
(OP)
A contractor installed the anchor rods too high such that the threads extend way above the base plate (by almost 3 inches). These were F1554 rods, but they bought them too long and installed them too high in the slab. He wants to install a stack of washers above the base plate to just above where the threads start. I've search and can't find any guidance on this problem.
Curt Fortenberry
Curt Fortenberry






RE: Anchor rod threads too high
RE: Anchor rod threads too high
RE: Anchor rod threads too high
Curt.
RE: Anchor rod threads too high
If all the other bases are covered (capacity, embedment length, geometry, clashes with other items,...) I would accept the use of washer plates, but with conditions. I would use only one, maximum two plates (not 15), I would specify a minimum dimension (idally square, each sided twice the height plus hole size) I would weld them to the columb base plate so that they are secure and they do not shift and I would make sure that the anchor bolts are tighten as required.
RE: Anchor rod threads too high
RE: Anchor rod threads too high
RE: Anchor rod threads too high
If there is no shear, moment or tension reaction on the plate, then I wouldn't be too upset over using a 3" high stack of plate washers to space up to the nut. I agree with kelowna as noted above: limit the number of individual shims they can use to 2 or 3 total, weld them to the base plate and to each other. But otherwise, the concept would be OK.
If there is shear, moment or tension on the plate, then things get a lot trickier.
RE: Anchor rod threads too high
Assuming embedment is OK
RE: Anchor rod threads too high
RE: Anchor rod threads too high