[TowerTalk] ELEVATED GUY

Thu Oct 20 01:24:32 EDT 2005

Chet:

I have in one of my towers (the biggest, 135ft) 3 elevated guy anchors,  was the only way to put this tower, i have several  buildings in the proporty, is a city lot, other things   like trees and some fences give not much clearence for the guys.
here is my case,   i need some good  and strong  anchor , my area is very popular for earthquakes  the separation less than 80% from the tower base.  i use   pipes 6.5 inch diameter  1/4 inche wall .  17  and 15 ft long each., i put 2  pipe welded at the tallest anchor pipe (17),  5 ft deep  in a big hole, in a inverted mushroom shape, 2 cubic meter at least in each hole of concrete , several rebars welded in the pipe to give structural strengt  to the concrete , this works in 2 anchors, in the 3rd i use a big H beam , 10x18x10 inches  7/16 inch wall    12 ft long  reinforced   with a smaller  7 ft H  and 1.5 inch steel bar  to gives  strengt just in case,  to this i add another 2 cubical  meters of concrete  5ft deep,  this beam was not at 90 deg, was installed at 75 degrees   (contrary to the pull action of the guys)
i hope to be clear in my installation , this have several years and have no problems , i sleep well in bad weather.  all the pipes are concrete filled ,  a single piple will bend tensioning the wires,  double gives good strength  one behind the other  , other thing i don't mention , i joint my anchor concrete base to  the wall basement ,  adding extra weight and support in case the ground gets very wet (extreme case) 

i think the over kill is the best to rest and sleep well

On 19 Oct 2005 16:44 PDT you wrote:

> 
> 
> After watching the PVRC contesting  tape by W3LPL I decide to take " Take off angle" seriously.   I recently put up a C4 at 45 feet below my C31XR at 90 feet. .  I chose 45 feet because........that gave me the most clearance for the C4 to turn underneath the top guy at 70 feet.... and using the EYEBALL method...it ALMOST clears.  Measured it today and we need another 20 inches for the reflector ( C-4 is on a side mount) to turn under the guy wire.
> 
> I had my navsys engineer over here today (n4baa) and we determined that if we put a piece of   I (eye) beam in the ground with 7 feet sticking up out of the ground and move the present guy back 4 feet (as far as I can go and still keep it on my property,  with the guy attached at 7 feet the C4  will clear the guy wire by a couple of feet..
> 
> I'm guessing I need a 10-12 foot section  of eye beam with 4-5 feet buried in the ground to have 7 feet exposed. Is there a rule of thumb or does Anyone really know , how much do i have to put in the ground and do I need rebar in the hole and how much cement is required to make sure the I beam stays put??  Tower is AB-105 Presently guyed at 40  and 70 feet, 2 el shorty XM 240 mounted at 72 feet on a second sidemount. 
> 
> Thanks
> 
> 73
> 
> Chet N6ZO
> 
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