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 <[email protected]> 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 > > [email protected] > > > > *From:* BVARC [mailto:[email protected]] *On Behalf Of *Mike > Brannan via BVARC > *Sent:* Friday, April 07, 2017 5:13 PM > *To:* BRAZOS VALLEY AMATEUR RADIO CLUB > *Cc:* Mike Brannan; [email protected]; 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 <[email protected]> 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 <[email protected]> > 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 <[email protected]> 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 > [email protected] > > 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 <[email protected]> > <[email protected]> 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 <[email protected]> > <[email protected]> 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. > > > > > > _______________________________________________ > > BVARC mailing list > > [email protected] > > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org > > Message delivered to [email protected] > > _______________________________________________ > > BVARC mailing list > > [email protected] > > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org > > Message delivered to [email protected] > > > > > > > > _______________________________________________ > BVARC mailing list > [email protected] > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org > Message delivered to [email protected] > > _______________________________________________ > BVARC mailing list > [email protected] > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org > Message delivered to [email protected] > > > _______________________________________________ > BVARC mailing list > [email protected] > http://mail.bvarc.org/mailman/listinfo/bvarc_bvarc.org > Message delivered to [email protected] > >
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