One other thing:
I'm sure some folks worry that they might find, after plopping a self
support tower down on *level* bottom nuts, that their pride and joy is
not plumb. Not to worry, if the tower is a Pirod, or Nello, or Valmont,
or Rohn, or whatever well know tower - that does not happen.
-Steve
On 7/22/2017 20:36 PM, Steve Maki wrote:
OK, but since Pirod's design spec, or instructions as it were, (and I
love Pirod, believe me) is already faulty as you know, we are seeking
after-the-fact solutions.
First, there is no need for the bottom nut to be 1.5" above the concrete
for leveling purposes. Unless your concrete is slanted severely for some
reason. Put all your nuts down to the concrete. Find the highest one.
Bring the others up to that level. You know where I'm going, right?
That's going to save you at least an inch or more.
Next, get rid of the lock washers. They are useless.
Next, disabuse yourself of the need for the 3" of threads showing on top
of everything for *leveling*. Not needed. If your bottom nuts are level,
you can get by with a 1/2" on top.
The critical task is to get the bottom nuts level. A laser level, or
just a long straight edge and bubble level is all you need.
-Steve K8LX
On 7/22/2017 20:06 PM, Paul Christensen wrote:
Several folks want to know why there's 12" of exposed bolt above the
surface. That's Pirod's design spec., but also keep in mind that a
self-supporting tower base foot does not rest on concrete. It actually
rests on a nut as a leveling device. The nut under the foot is
adjusted to
level a self-supporting tower. So, here's the actual length needed:
First, the nuts are all 2" in height and the bottom nut is spun to 1.5"
above the concrete surface -- again to allow for leveling. Next, add a
high
strength flat washer, lock washer, followed by the height of the tower
foot
which is 3.0". We then add more hardware and another nut to the top.
All
the washers together are 0.5" in height. So we end up with:
1.5+0.25+2.0+0.25+3.0+0.25+2.0 = 9.0 inches, leaving 3 inches at the top.
Probably the most I'd ever cut is maybe 1 inch off the top and that means
cutting 1 inch off of four extra-high-strength steel bolts is almost
certainly not worth the effort.
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