[TowerTalk] sorry for multiple mails, but had another idea

Sat Dec 13 16:35:19 EST 2008

Thanks for the response.

I live in north Texas about 70 miles north of Dallas. There is a strip of land from here to south of Dallas that is very unstable. We have clay and black gumbo that goes down as deep as 20'. In the hot Texas summers it drys and shrinks. Then when it rains, it swells and moves again. The foundation leveling companies love this area.
I could use an inverted top section of tower as you suggested and weld a 2 5"16" trailer hitch ball onto it. I would then have to come up with some type of socket to bury in the concrete. Also welding would burn the galvanized finish off causing me to have to paint it every few years.

I also looked at just using Rohn's single pier pin but I think that if the concrete foundation shifts too much it will start causing the tower to move out of plumb ( because the steel base plate that the tower is mounted on will start to contact the concrete base on the high side). Hope that that makes sense! In other words the guys will be holding the tower plumb but the concrete will move and contact the bottom of the steel plate. This defeats the purpose of a floating pier pin.
(BTW my current tower installed in 1992 is out of plumb by an entire bubble on my torpedo level and this is at GROUND level. At the top it might be off 10 or more degrees.)

Also I don't much like the idea of just depending on guys to hold the tower up. If they fail the tower comes down. If I mount the steel base plate on three bolts at least it won't come down.

I plan on mounting the steel base a inch or more above the concrete so that I have plenty of room for adjustment. If need be I can "over engineer" it and use 3/4" bolts.

You are right, Rohn sticks it too you. They are reasonable on the straight tower sections and give you the shaft on everything else.

73

Donald W5DWH

From: w9rma at charter.netTo: electroubleshooter at hotmail.comSubject: RE: [TowerTalk] sorry for multiple mails, but had another ideaDate: Sat, 13 Dec 2008 15:13:03 -0600

Check out some used towers and see if you can get a tower with a ball mount on the bottom.  If you look at commercial
Towers many are mounted this way.  You might check with someone who who mounts towers commercially and see if they
Make such a unit.  You might call Rohn Tower and check with them.  Be careful about ordering  from Rohn they are 
Very expensive as a friend found out.  (12 bolts 46”,$595.00)  A thought went through my mind… I am wondering if one
Could weld a support collar on a over turned 25G top section and mount it on a ball mount….hmmmm have to think on 
That one for a while.  

Your idea about the plates would also work.  I like that idea.  I have a 100 ft. self supported tower in the yard behind the 
House and it sits on 12 bolts and can be adjusted if the earth ever moved.  What part of the world do you live that the
Earth moves?  Another way to keep the tower from tilting is to have a broad base  4 x4x4 or is it the soil in your area?
There you would have to ask a engineer about that for the weight of the tower plus concrete, cables etc.
Ron W9RMA

From: Donald Hofmann [mailto:electroubleshooter at hotmail.com] Sent: Saturday, December 13, 2008 14:16To: w9rma at charter.netCc: towertalk at contesting.comSubject: RE: [TowerTalk] sorry for multiple mails, but had another idea

Thanks for the response. Referring to my current leaning tower I have decided that I am better off starting from scratch v.s. trying to level the old one for several reasons. One, if I move it I can guy it at the correct distance from the tower and two, I can fix the out of plumb tower. So my next questions: If I put in a new tower I want the base to be adjustable for out of plumb problems.Any thoughts on how to do this?I am considering the 25GSSB self supporting base plate. I propose to sink three 5/8" galvanized bolts into a concrete foundation. I would then put a nut on each bolt then the base plate and then double nuts. The idea being that if the ground shifts, I could loosen the guys a little, then adjust the nuts until plumb and then retighten the nuts. Any comments or better ideas?Also what size concrete base for this installation? I can't find out what Rohn recommends for this base plate. Thanks> From: w9rma at charter.net> To: electroubleshooter at hotmail.com> Subject: RE: [TowerTalk] sorry for multiple mails, but had another idea> Date: Sat, 13 Dec 2008 11:43:57 -0600> > Don:> First of all if you have a fifty foot tower you only have to be 80% for your> guy points that is if they go to the ground. If you move the guy points up> 4' that means can can come closer to the tower by a few points. Second I> used commercial garage coil spring rollers that had been taken out of> service and get thrown away.> I put them 4' in the ground cemented in with about a yard of concrete and> also fill the tube with cement. I well on tabs for the turnbuckles to> attach too.> > The towers which some are over 75' ft. have gone through tornados with winds> from> 90 - 110 mph and only the mast has bent. Poor choice of mast (water pipe)> Use a good mast such as moleychromium. Expensive but worth it in the long> run.> Ron W9RMA> > -----Original Message-----> From: towertalk-bounces at contesting.com> [mailto:towertalk-bounces at contesting.com] On Behalf Of Donald Hofmann> Sent: Friday, December 12, 2008 18:40> To: 'jim Jarvis'> Cc: towertalk at contesting.com> Subject: Re: [TowerTalk] sorry for multiple mails, but had another idea> > I was thinking that the top plate would act as a stabilizer to keep the> tower from twisting, similar to a "star" assembly.> > > -----Original Message-----> From: jim Jarvis [mailto:jimjarvis at optonline.net] > Sent: Friday, December 12, 2008 6:13 PM> To: Donald Hofmann> Subject: sorry for multiple mails, but had another idea> > > You know, for guy attachment, you can just form a loop and drop it over> a > tower leg, as you erect things? You may WANT the flat top, as a place> to> stand--but you don't need it for guy attachment.> > sorry for the fragmented responses, but I've been juggling waaaay too> many> balls here, this week. > > n2ea> > > Jim Jarvis, MBA> President - Executive Coach> The Morse Group, LLC> 732 548 5573 office 908 410 9130 cell> www.themorsegroup.net> > People-Process-Strategy: Achieving Results in a Changing World> > > No virus found in this incoming message.> Checked by AVG - http://www.avg.com > Version: 8.0.176 / Virus Database: 270.9.16/1843 - Release Date: 12/12/2008> 9:02 AM> > _______________________________________________> > > > _______________________________________________> TowerTalk mailing list> TowerTalk at contesting.com> http://lists.contesting.com/mailman/listinfo/towertalk> 

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