#41  
Old 06-29-2012, 03:47 PM
Gulf's Avatar
Il Pizzaiolo
 
Join Date: Sep 2011
Location: Mississippi
Posts: 1,660
Default Re: Very tall free-standing pole (for stove-pipe support)

kebwi,
If you are thinking about putting mutiple poles in the breeze, How about the structure pulling double duty.

You probably wouldn't want it to pump water, but a little help on the electric bill would be nice. Even if it isn't funtional a rustic wind mill might look good, hide, and brace your chimney .
__________________

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.



To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #42  
Old 07-09-2012, 10:00 PM
WJW WJW is offline
Journeyman
 
Join Date: Jan 2012
Location: Camarillo, CA
Posts: 367
Default Re: Very tall free-standing pole (for stove-pipe support)

Gulf is a genius!

Many, many jurisdictions around the U.S. have laws intended to promote alternative energy solutions like windmills. A place as militantly liberal/green as Seattle is bound to have such laws. (I'm can call your town "militantly liberal" because I live in Southern California and we are every bit as looney in that department as you guys. )

So you put a windmill at the top of a 20 foot metal pole next to your oven and call it green energy. A few weeks later you put up your chimney and tie it to the pole.

The reason I think it's important to have some legal cover for the pole is that your crazy neighbor is probably going to find a reason to complain about the tall pole next door. Interferes with butterfly migrations...or some other highly legitimate concern.

All kidding aside...you really should look into what the local codes will allow with respect to a structure like your twenty foot pole. Are you allowed to put up a twenty foot flag pole in your yard? A twenty foot tall ham radio antennae?


I'm no engineer, but I do think you'll need a stout metal pole to do the job. Maybe four or five inch diameter with relatively thick walls, sunk three or so feet down. I have no idea what the lateral loads would be with sixty knot gusts hitting that chimney, but they must be significant. If I were you I'd make some determinations as to what the likely peak winds are going to be during any given twenty year period...do the calcs on the lateral loads imparted...and then decide what you need...and build in a safety margin. I think you'll find you need metal and that it needs to be stout.

I also think you are going to find that there are building codes which come into play...and that your neghbor is going to force you to get acquainted with them.

Bill

P.S.: I know you're tired of the "Kill the neighbor" jokes...but I'm just saying.
Reply With Quote
  #43  
Old 07-09-2012, 11:34 PM
kebwi's Avatar
Il Pizzaiolo
 
Join Date: Aug 2009
Location: Seattle, WA, USA
Posts: 1,010
Default Re: Very tall free-standing pole (for stove-pipe support)

So today I bought this off Craigslist. It's an old lamp post that the previous guy got from some Seattle surplus source. He was using it as a CB antenna tower (it went several sections above this piece on various extensions for his purpose).

It's aluminum so it weighs practically nothing. It's 14'2" including the base, 1/8" thick, 2-7/8" OD at top, 4" OD at bottom, 12-1/2" OD at base. He mounted it by sliding it over a 3" pipe in the ground, so I think I'll do something similar, embed some sort of pipe in the concrete sticking up a few feet and slide this over the top...so I guess I need another piece of pipe. Ergh.

I'm not quite sure whether I should "fix" it to the pipe-footing. I can't imagine how I would do that without drilling holes through it, which would be a shame. The mounting brackets at the bottom of the base are completely broken off so the base can't be mounted in a conventional manner (bolts).

And then I need to figure out how to attach the boom. Again, it would be nice to not drill through the pole. A clamp around the outside seems obvious except that the pole is not cylindrical, so any clamp could loosen if it works its way up the pole. Hmmm...

Also, the top is open, so I need a cap of some sort, probably not hard to find (fingers crossed).

I also still haven't ruled out adding a second pole just for the sake of redundancy...but they would never match, so, I dunno.

Cheers!
Attached Thumbnails
Very tall free-standing pole (for stove-pipe support)-lamppost.jpg  
__________________

Website:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

WFO Webpage:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Thread:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


Last edited by kebwi; 07-10-2012 at 08:28 PM.
Reply With Quote
  #44  
Old 07-09-2012, 11:59 PM
kebwi's Avatar
Il Pizzaiolo
 
Join Date: Aug 2009
Location: Seattle, WA, USA
Posts: 1,010
Default Re: Very tall free-standing pole (for stove-pipe support)

To make a pipe foot to slide a pipe pole over, one would conventionally use, say, a heavy steel pipe of OD just slightly less than the ID of the pole. Such a pipe is probably really expensive (I can't find any second-hand for example).

Could I achieve a similar effect by using a piece of PVC, dropping several pieces of rebar in it (maybe even lengths of smaller easier-to-source pipe), and filling the thing with concrete? This would extend into the concrete anchor at ground level down about three feet, but would then project upward from the ground a few feet.

Would that work?
__________________

Website:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

WFO Webpage:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Thread:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Reply With Quote
  #45  
Old 07-10-2012, 11:17 PM
kebwi's Avatar
Il Pizzaiolo
 
Join Date: Aug 2009
Location: Seattle, WA, USA
Posts: 1,010
Default Re: Very tall free-standing pole (for stove-pipe support)

Did anyone have any thoughts on the last post w.r.t. a PVC, rebar, and concrete column as a foot to slide a pole over?...as opposed to a piece of steel pipe? I also posted a photo of the aluminum pole I got two posts up the thread. It's 1/8" thick.

Cheers!
__________________

Website:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

WFO Webpage:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Thread:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Reply With Quote
  #46  
Old 07-17-2012, 06:23 AM
countryboy's Avatar
Apprentice
 
Join Date: Jun 2010
Location: Central South Carolina
Posts: 157
Default Re: Very tall free-standing pole (for stove-pipe support)

Do you have a scrap metal salvage yard around?

We have a metal recycling place nearby that has a yard for the 'nice' culls out of the scrap. I go and browse looking for what I want then pay deep discount over new... They'll have what you are looking for and likely will cut to length and sell by the pound. Best route, hands down.
__________________
CB

____________________
My 42" WFO/outdoor kitchen build thread:


To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #47  
Old 07-17-2012, 07:01 AM
kebwi's Avatar
Il Pizzaiolo
 
Join Date: Aug 2009
Location: Seattle, WA, USA
Posts: 1,010
Default Re: Very tall free-standing pole (for stove-pipe support)

There are a bunch a scrap yards around here, but I think they are mainly for recycling, so they want to take people's stuff but never advertise much interest in selling back. I'll call around and see what's up.

Cheers!
__________________

Website:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

WFO Webpage:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Thread:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Reply With Quote
  #48  
Old 07-17-2012, 02:54 PM
kebwi's Avatar
Il Pizzaiolo
 
Join Date: Aug 2009
Location: Seattle, WA, USA
Posts: 1,010
Default Re: Very tall free-standing pole (for stove-pipe support)

So, a few posts up I showed a photo of a pole I bought and gave some basic specs on it and since I didn't receive any glaring objections, so I assumed it was a good pole for this project. I've been building my design toward using this pole for a while now, but some subsequent research has me second-guessing my design. For example, I keep reading that for a given thickness, aluminum is 1/3rd as strong as steel, so a 1/8" aluminum pipe is worse than a 1/16th steel pipe (it's no better than 1/24th" steel in fact!!!). Intuitively, this seems ridiculous to me. A 14', 1/24" steel pipe would flop over like a noodle but this 14', 1/8" aluminum pipe is confidently sturdy -- it was obviously intended to be used as a vertical pole (it's a lamp post of some sort), whereas you would never see a 1/16" (much less 1/24") steel pole for such a purpose.

So I'm very confused. Is this a strong pole or not. The fact of its existence and original purpose would suggest yes, but the math makes no sense.

Furthermore, some looking online suggests that schedule 40 aluminum pipe at the diameter of this pole would be .2" thick at the top and .226" thick at the bottom. Like I said, it's .125" thick.

Is this thing a dud? Do I need to start over with a different pole? I don't understand how it can be so weak, yet so seemingly strong at the same time.
__________________

Website:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

WFO Webpage:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Thread:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Reply With Quote
  #49  
Old 07-17-2012, 04:51 PM
Laborer
 
Join Date: Mar 2008
Location: antelope california
Posts: 62
Default Re: Very tall free-standing pole (for stove-pipe support)

the diameter of the material has more bearing on strength than wall thickness.
as long as you don't overload it with extra weight at the top, and make sure to properly
attach it at the base it will be fine.
Reply With Quote
  #50  
Old 07-17-2012, 09:28 PM
Neil2's Avatar
Il Pizzaiolo
 
Join Date: Oct 2006
Location: Vancouver Island
Posts: 1,374
Default Re: Very tall free-standing pole (for stove-pipe support)

Here is what you want:
Attached Thumbnails
Very tall free-standing pole (for stove-pipe support)-250px-gres-2.jpg  
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 09:38 PM.

Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
2006/10 Forno Bravo, LLC