"BobK207" wrote in message
...
On Feb 27, 2:04 pm, "SteveB" meagain@rockvilleUSA wrote:
I need to pour three anchors (I'll call them that) for a 32' long x 12"
wide
lean to metal awning. The frame will be made of 14 ga. 8" and 6" C
purlin
materials. Covered by 26ga. steel sheets. Corners 3" x 3" x .120"
posts.
Three posts will go on an existing slab, the top purlin will be attatched
to
the house. At the downhill edge, I will have the three posts that Ill
need
anchoring.

I have caliche there. I do not want to spend the time and money
jackhammering out caliche. So, I want to form and pour concrete. I
would
like to make it square, and to a dimension that will allow it to be tiled
in
most any configuration of 6" multiples.

In your expert estimation, how much mass do you think I would need to act
as
these anchors? I was thinking of 12 cubic feet, a 3' square with a 3'
tall
square or Snotube column coming up the steel to stave off rust at ground
level.

They will also be two staged, that is a small cube sitting on top of a
larger one, or a Sonotube going down into a larger diameter base. I
really
don't want them to come up too high, so will probably go with the two
step
idea. It will have rebar throughout, and the rebar will be welded to the
legs in the concrete.

My Pocket Ref does not give approximate weight of dried concrete per
cubic
foot.

TIA

Steve

~150 lbs/ cubic ft

Some comments.......

wind uplift forces on your awning

I'm not a big fan of welding rebar...usually too much carbon.

How about "after pour" drilled & epoxied studs or threaded inserts

cheers
Bob

It's all in the planning stage right now, and I did find the 150# figure in
my pocket ref when looking under weight of materials. 1800# (12 x 150) x 3
should hold down most anything. I do like your idea about the bolting,
though. I could even use threaded J bolts on a plate, and that would give a
little adjustment. Then build a cover for the base/bolt assembly.

I was pleasantly surprised today when my steel man came back with a price of
HALF what I had figured, and that's cut and delivered on site.

Steve