In a couple weeks, I'll be taking down a 58' Rohn 25 foldover for a 3 mile
move to this QTH. Since I've never been involved with the disassembly of a
tower, I'd like to make a couple inquiries:
I'm assuming that I will run into some sections that won't come apart
easily on this 15 year old tower. I plan to spray all bolts/joints with
penetrating oil about 3 days before disassembly time and again a day
before. I would like some comments on the use of a propane torch to heat
the 'stuck' joints. With most metal components, I've found that a
combination of heat and lubricants will generally do the trick. Outside of
damaging any paint, will a propane torch do any damage to the galvanized
coating and/or general strength of the steel at the coupling point? I can
also take up a small scissors jack, but the crossmembers on #25 are so
thin, I'm concerned about warping or breaking the welds if a jack is used.
Assuming I can get things off down to the hinge section, is it feasable to
bolt the hinge together (Rohn literature refers to a 'shipping tab' of some
sort used for this purpose), and then lower the entire boom assembly with
the gin pole?
I don't think I'll have any assistants climbing up with me. Hopefully the
40lb 25G sections will be manageable, but I'm not sure about that boom
If I survive the takedown, I plan on general cleaning, wire brushing if
required, painting or galvanizing spray, new hardware, new guys/turnbuckles
and anchors. Am I missing anything?
About the guying.. Rohn seems less than their usual conservative opinions
when it comes to guy specifications. 4ft by 6in screw anchors? (Although
I am told by a local installer that with our soil, these things will hold
well beyond their 2500 lb ratings). And even for a heavier/taller #45
foldover, the guy placement recommended is only 30 ft from the tower base?
Granted, this is a four guy arrangement rather than the usual 3, but
still.. I'm tending towards a traditional anchor/equalizer plate using a
3x3x1' concrete block. Or do the screw-in anchors work? I'd also prefer
to get the anchors out at least 40' from the tower base, unless the 4 vs 3
guys at hinge and apex really gives enough advantage to get by with the
Final question.. can somebody forward an address or telephone number for
WB0W (the gin pole man). $495 for the Rohn EF2545 gave me a bit of sticker
shock. And as an FYI, Rohn no longer supplies adapters for #55 (I plan a
55 installation next spring), and may cease production on the EF2545 soon.
Apparently there is a liability factor that is scaring off most of the
Mark Shaum K9TR
Central Illinois Grid EN50
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Administrative requests: towertalk-REQUEST@contesting.com