Two comments from my perspective,
1. Are you sure the crankup you have is designed for guys? The UST
crankups with guys have mechanical locks when each section is extended.
They must be released to lower the tower. The UST HDX-589 provided PE
calcs and done by my PE show slim (IMO) safety margin in the hoist
cable, so guying it above the bottom section would be a bad idea. The
sum of all the vertical components of guy tensions (9 guys for your
tower) plus the tower dead load must be within the cable and pulley
assembly load capacities at the maximum rated wind speed. A tall order
IMO again.
2. Each tower is different but pivoting equalizers are not used on all
towers. The Rohn R65 concrete anchors guy attach plates are welded to
the rods that go into the 4x6x2' buried concrete dead men. In that case
the rods are set at a specific angle w.r.t ground and each guy then
pre-tensions equally. There is little tension interaction since the
plate can move only by bending the rod. Not so with a pivoting
equalizer. It isn't clear to me why a pivoting equalizer is good for
the tower in high winds. Can other tower-talkians explain how?
Grant KZ1W
On 8/2/2018 13:43 PM, David Aslin G3WGN wrote:
Hi Towertalkians,
I have a pair of telescopic towers that are similar in size to a US Tower
HDX-589. The manufacturer specifies guying at 3 levels, but does not provide
equalizer plates. I'm mindful of the Towertalk prime directive, but as the
manufacturer is no longer in business, I can't consult them on this topic.
Seems to me that equalizer plates are a wise precaution at this high wind
location, but I'm open to the wisdom of the Towertalk crowd.
In order to fabricate some 3-way equalizer plates I need dimensions of, for
example, the Rohn equalizer plates. Would any kind soul care to measure theirs
or provide a specsheet that shows plate thickness, hole sizes and placements?
The Rohn catalog is silent on the key points!
73, David G3WGN M6O
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