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?
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|