Assuming you using a SB25G5 base section or tower base section, the Rohn
catalog specifies a 2 foot square or round hole 4 feet deep with at least 6
inches of compacted sand and gravel below for drainage. Place concrete form
so that top of base is 4 inches above ground. Place base section in center
of hole so that the lower legs protrude at least 2 inches into sand and
gravel.
I order 4000 lb concrete for all tower foundations. This job should require
a bit less than a yard, depending on actual hole size.
73, Keith NM5G
-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Dave NØRQ
Sent: Wednesday, November 09, 2005 9:23 AM
To: Towertalk Reflector
Subject: [TowerTalk] base for very short Rohn 25G
I don't believe Rohn gives specs for something this short, so I'm asking for
advice (not PE specs) for a short Rohn 25G.
This will be for satellite antennas: a couple of beams, total of roughly 6-7
square feet. The Rohn 25G will be 20' tall, and will have a mast out of the
top of about 5-7'. It will be one normal section and one flat-top (25AG4)
section, sitting on top of a hinged short base (SBH25G).
The tower will also be attached to the house at about 8' off the ground.
What size hole do I need for the base? (I know to have plenty of gravel in
the bottom for drainage.) Other suggestions welcome as well.
Thanks & 73,
Dave N0RQ
_______________________________________________
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.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
_______________________________________________
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.
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|