Check out the latest foundation plans on the US Tower web site. They have
recently changed the drawings for their foundations and now require 16
pieces of vertical rebar, two in each corner and two in the center of each
side. Unfortunately, there are multiple mistakes in the drawings so it is
unclear what size they want. The drawing for the HDX-572 foundation shows
16 - #6 vertical bars while the material list show 16 - #7 bars. Also,
instead of 10 horizontal rebar loops, there are now 20 of them. 10 of them
are wrapped around the corner rebar and 10 are wrapped around the rebar in
the center of each side. Again there are mistakes in the material list
since those two sets of 10 rebar loops have different dimensions and the
only size given is for the loops that wrap around the corner rebar. There
are similar mistakes on the HDX-589 foundation drawings. Personally, I'd
fire any Engineering firm that doesn't catch mistakes this obvious before
sending them to the client. Also, US Tower should be smart enough to catch
this stuff before they publish it on the web site.
73,
Clay W7CE
----- Original Message -----
From: "Tod -MN" <tod@k0to.us>
To: "'Bill NY9H'" <ny9h@arrl.net>; <towertalk@contesting.com>
Sent: Monday, May 24, 2010 9:05 AM
Subject: Re: [TowerTalk] re installing my hdxmdpl72 question on rebar
> Bill:
>
> I recall from last Autumn that not only is the requirement for #9 rebar,
> but
> it is for TWO such elements in each corner of the foundation. I do believe
> that the spec is set up for earthquake locations. Here in Idaho, on the
> Snake River Plain, it turns out that proximity to Yellowstone Park [100
> miles] meant that I was in an Earthquake zone. We get lots of very little
> tremors apparently and the dome in the center of the Yellowstone Caldera
> is
> rising a couple of inches each year.
>
> In any event, the #9 was available locally -- presumably because everyone
> needs specially reinforced foundations. The people who installed the rebar
> and poured the concrete were more frustrated by trying to bend #4 at right
> angles without a special bending assembly [which they eventually did go
> off
> and arrange] than by the locating and handling of the #9.
>
> Tod, K0TO
>
>
>
>> -----Original Message-----
>> From: towertalk-bounces@contesting.com
>> [mailto:towertalk-bounces@contesting.com] On Behalf Of Bill NY9H
>> Sent: Monday, May 24, 2010 8:41 AM
>> To: towertalk@contesting.com
>> Subject: [TowerTalk] re installing my hdxmdpl72 question on rebar
>>
>> planning the rebar cage for the 72 footer,,,so I
>> downloaded from UST the california engineering drawing.
>>
>> Went to acquire the rebar,,, the spec calls for some # 4(1/2 )
>> ok & qty 8 # 9 (1 1/4") wow.....
>> Nowhere can I find stuff that big.... the contactor supplier
>> suggested that might be because of CA earthquakes,,,,&@$#@ ....
>>
>> While I'm trying to follow the factory spec ,,,,is that way
>> overkill....???
>> I plan on calling UST when CA awakes.
>>
>> bill / 3
>>
>> _______________________________________________
>>
>>
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