I spoke with another tower manufacturer who recommends the coring/epoxy
method and has an engineer who will approve that installation on my
existing base.
This is going to be expensive, but a brand new tower should last as long as
I will, with good maintenance.
Thanks, folks for all the input. As requested, when I decide exactly what
to do, I'll post back.
73,
Mickey N4MB
On Fri, Jun 21, 2013 at 2:08 PM, John Lemay <john@carltonhouse.eclipse.co.uk
> wrote:
> When the tower is vertical the wind will exert a force, in which the
> critical factors are wind speed and area of steelwork presented to the
> wind.
>
> When the tower "lays over" gravity exerts a force on the mass of the tower
> (plus aerials, rotators etc).
>
> Given the variables of wind speed, tower size, aerial array etc, the
> original question can't be answered without much more info.
>
> However, I have a Versatower here which "lays over" at about the 6ft
> height,
> and it is held down by four epoxy anchors. It's been in position for around
> 15 years.
>
> I chose the epoxy anchors when I learned that the same fixings were used by
> the highway authority to fix safety fence (crash barrier) to bridges.
>
> It's tough work drilling the holes (you should worry if it is not), and
> crucial to make sure the hole is free of dust and moisture.
>
> John G4ZTR
>
> -----Original Message-----
> From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf Of
> K7LXC@aol.com
> Sent: 21 June 2013 18:26
> To: towertalk@contesting.com; wk1w@ivanshapiro.com
> Subject: Re: [TowerTalk] Tower Replacement - what would you do?
>
> >> K7LXC wrote:
>
> >> Installing just about any kind of base in an existing base is easy.
> Just
> rent a rotary hammer and coring bit and drill new holes for your new
> anchor
> bolts. Use industrial epoxy to glue them in and you're good to go.
>
> > I wanted to ask Steve the following about this post:
>
> > Steve: I imagine you would not recommend the above for a tower that
> lays
> down, like a US TOWER HDX series. The vector forces would be quite
> different from a strictly vertical that doesn't lay down. Am I correct?
>
> No. Not being an engineer I can't comment authoritatively. But I
> suspect the forces on a tower that's being lowered from vertical to
> horizontal
> is significantly less than the same tower vertical in a big wind. The
> anchor
> rod epoxy is stronger than the concrete so I don't see any reason why you
> couldn't do it.
>
> I've used the above technique many times and I think that all of the
> towers of interest for this were crank-ups.
>
> Cheers,
> Steve K7LXC
> TOWER TECH -
> Professional tower services for amateurs
> _______________________________________________
>
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--
Mickey Baker, N4MB
Fort Lauderdale, FL
*“Tell me, and I will listen. Show me, and I will understand. Involve me,
and I will learn.” *Teton Lakota, American Indian Saying.
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