[TowerTalk] Tower Base JA style

[NPAlex at aol.com]

Lately there has been discussion of tower  bases and installations as in 
Greg's message below, and I am also in the process of relocating a tower with the 
attendant problems of digging the hole, stabilizing the hole (sandy soil), 
rebar framing and finally pouring the concrete.   

I thought that was a lot of work and expense until I ran across the following 
series of pictures of a Japenese ham's tower installation.  Suke JM7OLW must 
have one of the most expensive tower support systems ever constructed.  Take a 
look at his site - http://www.geocities.jp/jm7olw_suke/KT35SR.html  Albeit it 
is a big tower, that is a lot of concrete work.  He also has an outstanding 
signal on 40m CW most mornings.

Regards,
Norm W4QN
===============================================
 
Message: 8
Date: Sat, 7 Oct 2006 17:19:48 -0700
From: "AB7R" <ab7r at cablespeed.com>
Subject: [TowerTalk] Tower base advise
To: <towertalk at contesting.com>
Message-ID: <NPEPLDGLIFKDGPHGAGOMMEHJEOAA.ab7r at cablespeed.com>
Content-Type: text/plain;    charset="iso-8859-1"


Not sure if I over did this or not.  My neighbor brought his backhoe over
this afternoon to dig the foundation for my HG-70HD tower and raising
fixture.

The specs only call for a 4x4x8 hole.  While we did not quite hit 8ft (a bit
over 7 in the middle), the dimensions came to 6.5 x 6.5.  Thats 270 cubic ft
vice 128.  Is the slightly shallower depth going to make a big difference?
I attached a couple pics.

I hope to schedule the concrete pour for this week.  4000 psi and gonna have
it poured pretty wet.  Do I need to get one of those vibrating things or is
pouring it wet sufficient?


Thanks
Greg