Gary, I think I would ask the tower company for engineering specs.
Now you mention a tilt over base/ginpole. Not gonna happen in a 2
by 2 by 2 base. I cannot find any information on the tower on line
other than a brief description in that they just started producing
after Dayton 2016. No manual, no drawings, no detailed specs to
speak of.
Question to consider: When it is extended at 31 feet and you have
your 45 pounds of rotor and antenna (windload area not known) waving
in a brisk, pre-wx-front breeze...what forces will be exerted 31 feet
down the unguyed tower to the 700 pond base. Overkill is the
preferred build method. Keep Redy-Mix in business.
W5RH
Rick Hiller
/The Radio Hotel/ -- W5RH
On Fri, Apr 7, 2017 at 5:44 PM, Scott Medbury via BVARC
<bvarc@bvarc.org <mailto:bvarc@bvarc.org>> wrote:
Normal weight concrete is about 145 lb per cu.ft. That is wet
weight. Concrete sold at home centers is dry weight so the yield
will be less than one cu.ft. Straight sack concrete is generally
easier than using flyash if you are creating at home.
If mixing materials by hand from bulk, the old 1,2,3 rule works
well to give 3000 psi or greater. using one bucket or container
of portland cement to 2 containers of sand to 3 containers of
coarse aggregate. Of course if you need air entrainment or want
to use a water reducing, set retarding admixture or super
plasticizer you are better off using redi-mix concrete and
ordering it. Air entrainment is not necessary in this climate if
the bulk of concrete is in the ground.
Scott KD5FBA
Scott Medbury
16802 Aprilmont Drive
Sugar Land, TX 77498-1941
smedb...@windstream.net <mailto:smedb...@windstream.net>
*From:*BVARC [mailto:bvarc-boun...@bvarc.org
<mailto:bvarc-boun...@bvarc.org>] *On Behalf Of *Mike Brannan via
BVARC
*Sent:* Friday, April 07, 2017 5:13 PM
*To:* BRAZOS VALLEY AMATEUR RADIO CLUB
*Cc:* Mike Brannan; gasit...@comcast.net
<mailto:gasit...@comcast.net>; Rick Hiller
*Subject:* Re: [BVARC] Need Concrete/Hole work done for a light
Tower Base??
Carefully check the sack yield.
Normal weight concrete is roughly 145 lbs/cu ft.
Use greater than 3000 psi strength concrete.
Do not add excess water. Rod the stiff mix into place.
Note the 2 x 2 x 2 should be measured at least 6 inches below
grade and so all surfaces are against firm to stiff soil.
That means you will need extra concrete to finish above grade.
Sent from my iPhone
On Apr 7, 2017, at 4:46 PM, Rick Hiller via BVARC
<bvarc@bvarc.org <mailto:bvarc@bvarc.org>> wrote:
8 cu ft X 90 lbs per = 720 lbs.
31 foot lever moving 720 lbs.....doesn't take much moment.
Where's KG5KV when you need him?
RH
Sent from my i-Thingamajig
On Apr 7, 2017, at 4:30 PM, Scott Medbury via BVARC
<bvarc@bvarc.org <mailto:bvarc@bvarc.org>> wrote:
A sack of sackrete is less than 1 cubic foot. It weighs
about 80 pounds and a cubic foot of concrete weighs from
90 to 96 pounds before water is added.
Scott KD5FBA
/Sent from my Verizon 4G LTE Droid/
On Apr 7, 2017 2:04 PM, Gary Sitton via BVARC
<bvarc@bvarc.org <mailto:bvarc@bvarc.org>> wrote:
Rick,
ALM-31 is new product so I don't have the specs.
yet, but it's extruded 6061-T6 Alum. and will weigh
~200 lbs. with the beam and rotator. I would not
need or want to fold it over fully extended! My
handy guy said he'll do it for $500: materials, hole,
frame, re-bar and pour. Seems a bit high, but it's
turn-key and he's very meticulous. I probably could
save some money by having a less skilled person
dig and prepare the square hole. Bell-bottoming
is a great idea however! Attached is picture of my
homebrew common mode coax choke for the beam.
73s,
Gary Sitton, K5AMH
gasit...@comcast.net <mailto:gasit...@comcast.net>
On 4/7/2017 12:59, Rick Hiller via BVARC wrote:
Gary,
I'm
surprised that a crank up fold over only specifies 2x2x2.
Yards maybe but
not feet. Heck, Rohn 25 needs more than that.
GL.....Rick
W5RH
Sent
from my
i-Thingamajig
On Apr 7, 2017, at 12:46
PM, Bruce via BVARC<bvarc@bvarc.org>
<mailto:bvarc@bvarc.org>
wrote:
might want a
little extra redi mix in case you bell bottom the hole or
come above the
ground level.
73...bruce
Sent
from my iPhone
On Apr 7,
2017, at 12:30 PM, Sam Neal via BVARC<bvarc@bvarc.org>
<mailto:bvarc@bvarc.org>
wrote:
Hello,
I'm
too far and too old to assist. Just a pointer - if you buy
sacks
of
readi-mix for your cement, each bag ( should be
marked on the bag ) is one
cubic foot. Eight bags
should fill the 2X2X2
hole.
A cubic yard would
take 27 sacks at one cubic foot
each.
73,
Sam
Neal
N5AF
____________________________________________________________________
Tower
guys:
I'm seriously contemplating and soon buying
a
US Towers ALM-31,
crank-up, fold-over
tower
for my Tex Hex beam
which requires a 2' x 2' x
2'
(about a cubic
yard) of concrete base.
Does
anyone have a
suggestion regarding
someone
to dig and fill
the
hole?
I will have anchor bolt forms and all re-bar
work
done ahead of the
dig/pour. I'm 77 and just had
a
double (yes!) hip joint
replacement and can't
really
dig such a hole
nice and square. Also, I have
no
concrete experience
and you only get one
chance
at a good
pour.
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