|To:||Dave <VO1AU@rac.ca>, towertalk <firstname.lastname@example.org>|
|Subject:||Re: [TowerTalk] Concrete base for self-support tower|
|Date:||Wed, 20 Aug 2003 23:10:53 -0500|
The volume you propose, 5 X 5 X 3, is more than adequate. It will resist much more overturning moment than the 4 X 4 X 4. Put a rebar cage in the concrete. Next problem: can you get the concrete to the hole? It should be a continuous or nearly continuous pour for strength. More steel can make up some deficiency in the concrete.
Putting the base under ground effectively 'floats' it in earth and reduces the tendency for the earth to flow away from the base, permitting it to sink or tilt. Soil, even rocky soil, must be considered liquid. Some soils flow faster than others. Bedrock is solid.
I understand the principles of the usual designs for self supporting tower bases, but am not qualified to judge the burial question, especially without knowing more about the soil. However, 5 X 5 X 3 is over the requirement for a 48 ft tower with a typical load of antennas and other equipment in 80 mph wind and I would risk it if there is nothing for the tower to fall onto.
73 de WOØW
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions and ask for Sherman, W2FLA.
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