[TowerTalk] Tower Replacement - what would you do?

[John Lemay]

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 at contesting.com] On Behalf Of
K7LXC at aol.com
Sent: 21 June 2013 18:26
To: towertalk at contesting.com; wk1w at 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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