All,
This looks very much like my 4-section, tilt-over, Tristao Tower, 71 feet high
(20-foot sections). The shelves are identical. The lifting cable pulley cages
are identical. The rungs are identical. Even the welds look identical. However,
my Tristao has only horizontal rungs (but no diagonal bracing), and it does
have guy loops (three chain links) welded on at each section. It does require
guying, at the 20', 37', 54', and 71' levels.
I'd guess that diagonal braces would be added for an unguyed, self-supporting
tower. Just my guess.
Tristao intended that safety bars be installed as this tower is cranked up.
Three bars under each of the three upper sections. As you crank up, the top
section (lightest) shoots up first, and so on. After the third section is
fully "up", the last set of safety bars is inserted, and the tower is lowered a
couple of inches onto the safety bars, and taking the load off the lifting
cable. Then, the guy tension is taken up. I think Tristao recommend 75 lbs
tension on each of three guys (at 120-degress spacing)for each of the four
levels. Don't use this figure unless you verify it with me: I'll actually look
it up.
I think that Tristao Towers was sold to U.S.Towers c1980.
I have some pictures of my tower I can send if it will help: shoot me an email
address.
Dennis, K6IFB
(510) 219-9212 MDT
-----Original Message-----
>From: David Thompson <thompson@mindspring.com>
>Sent: Mar 17, 2010 5:17 PM
>To: towertalk@contesting.com
>Subject: Re: [TowerTalk] Help with tower ID
>
>May be a Tristao or Towermaster. I don't see any guy hooks welded to the
>top of each sectiom. So probably a self supporting model.
>
>Ron I have all the material on older tristao towers. First, look on the
>plate holding the winch for a possible model #. Then measure the top and
>bottom section (any side) and I'll look them up in my material.
>73 Dave K4JRB
>
>----- Original Message -----
>From: "ronald schmid" <rollie4x4@sbcglobal.net>
>To: <towertalk@contesting.com>
>Sent: Tuesday, March 16, 2010 8:31 PM
>Subject: [TowerTalk] Help with tower ID
>
>
>I was told to look here. Someone has seen this tower here before.I am
>looking for any info or pics specs for a Tri-ex model HZ-354. Not sure this
>is the model or not.
>
>http://chat.qth.com/viewtopic.php?t=7530
>
>Thank for any info
>RON, N6DCN
>
>
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