|To:||Dino Darling <firstname.lastname@example.org>, email@example.com|
|Subject:||Re: [TowerTalk] Roof Mounted Self Supporting Tower...|
|From:||Jim Lux <firstname.lastname@example.org>|
|Date:||Wed, 12 Nov 2003 10:20:44 -0800|
At 10:02 AM 11/12/2003 -0800, Dino Darling wrote:
What about building a rigid pyramid to support a free standing tower. Because the members are rigid they can carry both compression and tension loads (as opposed to tension only guys). The members could be something like pipe, and probably wouldn't need to be all that tall, and might be invisible from the ground (particularly if there's a parapet around the roof)
What you're really looking to do is to carry the overturning forces on the tower to multiple roof members.
This would be a lot lighter weight (for a given strength) than a flat plate platform.
The other approach would be to make the platform a truss, supported some small distance off the roof, which is anchored to the beams under the roof at the appropriate places. The design would be a big more sophisticated, but, think of it in these terms:
A 40 foot freestanding tower can transmit all the bending loads to the base and isn't particularly huge. Now, imagine that tower laid on its side. Assume a perfectly rigid tower sticking up and attached perfectly rigidly to your laying down tower. The loads on the laying down tower are basically the same as they were in the previous case, and you could transmit the entire bending load to the other end of the tower without failure.
In reality, your truss wouldn't need to be anywhere as big as the tower: you've got multiple places of support, for one.
If you have mounted a tower on a roof, I'd like to hear what you have to say and any tower manufacturer recommendations you may have! I was thinking about aluminum in order to keep the weight down to a minimum. Another option was a guyed Rohn 25G.
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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