Thank you Steve, well thought out and logical questions to the ORIGINAL
post from Byron W5FH expressing his tower leg bolt concerns and then
followed by my flippant answer questioning that the tower leg bolts
quality were really the least of his concerns.
Wherein Dick W1KSZ cited this 120' R-25 calamity experience. Steve your
message/response is fact, experience and logical driven thank you
much. w5mc
On 2/9/2019 11:45 AM, k7lxc--- via TowerTalk wrote:
We had a local back in the Boston area who put up 120' of Rohn 25.
He didn't know about Rohn putting the bolts in the tower legs so he went out
and bought stove bolts.
The tower didn't make it through the winter.
120' of Rohn 25 falling in a 1/4 acre lot is not a pretty sight !!
Ouch!
But I'm not following you. What exactly was the failure mode? High winds?
Ice loading? I'm skeptical that is was because of joint bolt failure.
The top ends of 25G legs are swagged so that even if there were no bolts
in there, the tower leg would only go down as far as the swagging would let it. This is
not catastrophic. The legs would be jammed together. Even if the bolts sheared, the
downward travel of the leg would be less than an inch or so.
I've had lots of experience with 25G and the legs are surprisingly strong.
I don't see how the compressive forces on 120' of 25G would be enough to drive the legs
down enough to split and be fatal. What am I missing?
Cheers,Steve K7LXCTOWER TECH -Professional tower services for amateur and
commercial installations
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