Re[2]: [TowerTalk] How much concrete??

[pramey@smtplink.ram.com]

     You mite try your city engineer.  Ask the city for the spec.'s they 
     use to install light poles of the same size.  They install them all 
     the time.
     
     Paul
     WG0G/W2
     Jackson, NJ


______________________________ Reply Separator _________________________________
Subject: Re: [TowerTalk] How much concrete??
Author:  "Bill Simpson" <Bill.Simpson@MCI.Com> at SMTPLINK-rammob
Date:    10/9/97 10:30 AM


Gary K9GS wrote:
     
A local ham is giving me a 27 foot steel light standard.  It is tapered, 
going from about 8 inch diameter at the base, to about 3 inches at the 
top.  It is octagonal in cross section and has a wall thickness of 
approximately 3/16 inch. They are originally designed to be free standing.
     
I want to use this strictly for supporting VHF verticals for packet and 
perhaps small 6M and 2M yagis. Since I live on a hill, the height is 
perfect for this application.
     
I have two questions:
     
1) How does one determine the proper size concrete base?  The manufacturer 
is unknown.
     
2) Does anyone have any ideas on how to best mount this thing?  I have 
thought of setting a suitable sized (8 inch OD) piece of well casing in 
concrete, with perhaps 2 feet sticking out, and bolting the light standard
to the well casing after lowering the light standard over it.  I will probably 
have to fabricate some type of shims to take care of the taper.  
Any other ideas?
     
73,
Gary K9GS 
   __________________
     
     
Perhaps make four brackets that will provide a tab to mount it to anchor 
bolts in a concrete base and straps for two or three bolts to secure it
to the light standard. Don't scrimp on the straps. Use like 1 1/4 or 1 1/2 
by 1/4 inch hot rolled bar. These would work with 1/2 or 5/8 anchor bolts.
     
As far as size of the concrete base there are soil conditions to consider
and the actual load you are going to have on this mast. Also what wind 
conditions
     
it would subjected to. 
     
Let's hear from all the mechanical engineers for base size. I would guess 
2x2x3 foot would work as there is not much load on it.
     
Bill N5CMI
Plano, TX
     
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