Yes, my rebar cage was made of weldable rebar and hot dipped galvanized
as well. Tashjian does good work. If you check the Tashjian cage to
tower interface you will see the most reasonable and practicable
approach is welding. Just off hand I can't think of an alternative that
is as good.
Forgive my ignorance of US Tower designs as I have never studied their
approach.
Patrick NJ5G
On 5/4/2017 3:10 PM, Wes Stewart wrote:
IMHO, the rebar in steel-reinforced-concrete is there to constrain the
concrete under tension. It's not there to anchor the tower. Generally
speaking, welding isn't a good idea either, unless rebar graded for
weld-ability is used (Grade "W"). The stuff you buy at Home Depot is
probably Chinese made and of questionable quality.
If the OP would simply download the instructions from US Tower, the
foundation is fully described.
http://www.ustower.com/wp-content/uploads/2014/05/TMM-433HD.pdf Three
anchor bolts go in the concrete and the rebar is placed at the sides
and corners of the foundation. There is no connection between them
and a footnote specifically states: "No welding allowed." Tie the
bars and be done with it.
Wes N7WS
On 5/4/2017 11:22 AM, Patrick Greenlee wrote:
A rebar cage is not rocket surgery or brain science! To give you
better advice you need to give some details on the tower to rebar
cage connection. There are several methods of connecting the
concrete to the tower base. My Tashjian 70 foot crank-up/tilt-over
has bar stock protruding vertically downward from all three legs of
the tower. The bar stock is 3 inches wide and each of the 3 pieces of
bar has 6 holes on 2 1/2 inch centers. Similar steel bars with
matching holes for 3/4 inch bolts are set in concrete and bolt to the
tower. The bars in the concrete are welded to the rebar cage.
Having fairly recently become a "bionic man" (pacemaker
defibrillator) I'm not supposed to weld so bought the cage built from
Tashjian (excellent materials and workmanship) but if I had it to do
over I would have hired a local welder to do the welding and I would
have done the assembly in prep for that myself. My foundation (as
per Tashjian drawings) is 4'x4' square and 8 ft deep. I formed up an
8x10 ft rectangle centered on the 4x4 hole using 2x6 lumber (5 1/2
inches wide) to give me extra tilt resistance and a nice place to
stand when doing anything at the tower base. I used significant
quantities of rebar to tie the 8x10 slab to the 4x4 central core of
the composite foundation.
There are numerous other tower to foundation designs. To offer
additional assistance I think most of us here would need more info
about your specific tower mating system to be able to give actionable
advice. I am happy to offer more assistance if you can supply more
details and maybe someone else has some good ideas for you too.
If you don't weld and have no access to a good welder then buy the
cage pre-built.
Patrick NJ5G
On 5/4/2017 11:37 AM, Joe Partlow wrote:
I need to pour a base for a TMM-433HD tower but first I need a rebar
cage.
Do it myself or hire someone and who would I hire?
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