Dave,
I'm not a structure engineer either, but an easy short term, or long term
fix, depending on how you feel about it, is to U bolt on a piece of 1/4" or
larger by 1 1/2 in to 2 1/2 in angle iron over the bent area. If you use
enough U bolts, around the leg and over the angle iron, you may be able to
almost straighten the bent part. You could also use a large strip of flat
steel between the leg and U bolts so not to crush the leg. It would help to
tap on the diagonal cross support to help straighten the vertical leg too
as you tighten the U bolts..
I did this same thing on a 120 ft of R25 tower. This piece angle iron was
left on the leg and lasted until the tower was taken down.
Ray,
N6VR
On Fri, Oct 21, 2016 at 11:09 AM, Hardy Landskov <n7rt@cox.net> wrote:
> Dave,
> Just a FYI, the bolts you are using are not for Rohn tower. The correct
> bolts are made for Rohn by someone and supplied when you buy the tower
> sections and the bolt package so that the threads that stick through are
> not
> in the shear plane of the bolts. They are galvanized, not stainless steel.
> They are very close tolerance also. Not your ACE hardware overpriced junk.
> I had a professional tower erector here to tell me the good, the bad, and
> the ugly and we got it right when I put up my 110 footer. He used to put up
> 1500 foot TV transmitting towers in Tampa. If you want his email I can send
> it. He can help you.
> Hardy N7RT/4
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
> Dave
> Leisman
> Sent: Friday, October 21, 2016 12:05 PM
> To: towertalk@contesting.com
> Subject: [TowerTalk] Rohn 45 Bent Leg
>
>
> I need some advice. I have a 70' Rohn 45 and had a guy with a tractor back
> into and damage one of the legs. As well, the leg was hit hard enough to
> bend the diagonal cross support. I could probably, with assistance of a
> come along, bend the leg back into place and bend the diagonal support back
> into place as well, but that would not resolve the huge indentation which
> resulted from the contact with the tractor., e.g., the leg's strength would
> still be compromised. There is no antenna on top of the tower; I was just
> getting ready to place my TH-11. The tower is guyed at 30' and 50' at the
> current time.
>
> My thought is to rent a mobile crane with a boom long enough and
> significant
> enough to lift the 6 sections above the damaged section, in total (still
> bolted together) from the damaged section; then cut the damage away from
> the
> damaged section, and then lower the 6 sections down to the now repaired
> section, drill all the holes and bolt everything back together. Is this
> possible? I am concerned about climbing the tower, because of the damage
> done to the leg - because somehow I need to strap the 6 undamaged sections
> to the boom of the crane.
>
> Another question is whether the stainless steel bolts holding the 6
> sections
> together are sufficiently strong enough to hold the 6 sections together
> while I work on the damaged section.
>
> I really don't want to start over because that means another hole to dig,
> expense of more concrete, placement of additional guy wire anchors (and
> more
> concrete), and waiting until late spring.
>
> Any advice would be appreciated.
> _______________________________________________
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