#1  
Old 07-12-2012, 12:15 AM
kebwi's Avatar
Il Pizzaiolo
 
Join Date: Aug 2009
Location: Seattle, WA, USA
Posts: 1,010
Default Steel pipe vs. rebar-concrete-filled-PVC for a column

To make a short sturdy column, embedded about three feet deep and extending three to five feet above ground, and of diameter approximately three to four inches (to be a "foot" over which to slide the end of a tall vertical pole) one might conventionally use a piece of steel pipe...but I think that's expensive and troublingly difficult to source.

Another way is to use a PVC pipe, drop a bunch of rebar in it, and fill the whole thing with concrete.

Such pipes are common in other uses (telescope pier mounts for example). Non PVC concrete pillars are, of course, a basic staple of construction, but those primarily bear a vertical load whereas the purpose of the column in my application is to provide lateral resistence to a "balancy" vertical pole (plus additional lateral forces, see other thread for more on that). An all-concrete column would obviously be a bad candidate for a "sideways-pushing" (lateral) requirement since it could simply break...but with the flexible yet strong PVC holding it all in place and with sufficient rebar to skeletonize the whole thing, I think it has potential.

Do you think this would work? Would it adequately support a vertical pole in the same basic fashion as a steel pipe? If so, how would you trade off the amount of rebar vs. the amount of concrete?...or would you never in a million years go near this insane idea?
__________________

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
  #2  
Old 07-12-2012, 02:50 AM
Laborer
 
Join Date: Mar 2008
Location: antelope california
Posts: 62
Default Re: Steel pipe vs. rebar-concrete-filled-PVC for a column

I would go with the steel pipe, the concrete will want to break away from the rebar when it flexes, and the pvc gets brittle over time.

you should be able to source a short piece of pipe without to much trouble


mike
Reply With Quote
  #3  
Old 07-12-2012, 07:16 AM
kebwi's Avatar
Il Pizzaiolo
 
Join Date: Aug 2009
Location: Seattle, WA, USA
Posts: 1,010
Default Re: Steel pipe vs. rebar-concrete-filled-PVC for a column

Yeah, for $100. Dammit.

Okay, thanks.
__________________

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
  #4  
Old 07-12-2012, 07:24 AM
Tscarborough's Avatar
Il Pizzaiolo
 
Join Date: Oct 2009
Location: Ausitn
Posts: 3,076
Default Re: Steel pipe vs. rebar-concrete-filled-PVC for a column

A fence post shouldn't cost a hundred bucks. Buy the thin gauge fence post and fill IT with concrete (no rebar needed).
Reply With Quote
  #5  
Old 07-12-2012, 08:14 AM
kebwi's Avatar
Il Pizzaiolo
 
Join Date: Aug 2009
Location: Seattle, WA, USA
Posts: 1,010
Default Re: Steel pipe vs. rebar-concrete-filled-PVC for a column

Thanks Tscarborough.
__________________

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
  #6  
Old 07-12-2012, 03:36 PM
deejayoh's Avatar
Il Pizzaiolo
 
Join Date: Jul 2010
Location: Seattle
Posts: 1,346
Default Re: Steel pipe vs. rebar-concrete-filled-PVC for a column

I've got some cyclone fencing I need to cut down. You can have a post
__________________

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
  #7  
Old 07-14-2012, 11:33 PM
kebwi's Avatar
Il Pizzaiolo
 
Join Date: Aug 2009
Location: Seattle, WA, USA
Posts: 1,010
Default Re: Steel pipe vs. rebar-concrete-filled-PVC for a column

So, the primary pole is about 3-1/2" inner diameter at the bottom and I will slide that over anchor pole a few feet high (embedded in concrete). I got some thin-walled (1/16") fencing conduit 2-3/8" wide, which is about as wide as can be easily found. If I slide the primary pole over that, it's going to have a lot of freedom to flop around. I think I should "thicken" the inner pole somehow. Not to mention, if I place something nonmetalic between the two poles they won't clank too loudly. A piece of 3" PVC is 3-1/2" outer diameter, which is perfect to fit inside the primary pole, but it's still too lose relative to the inner pole (2-3/8").

What would you do about this? How would you tighten up this gap so the two poles fit together more snuggly?
__________________

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
  #8  
Old 07-15-2012, 06:48 AM
Tscarborough's Avatar
Il Pizzaiolo
 
Join Date: Oct 2009
Location: Ausitn
Posts: 3,076
Default Re: Steel pipe vs. rebar-concrete-filled-PVC for a column

Have you ever used a cheap Christmas tree stand?
Reply With Quote
  #9  
Old 07-15-2012, 08:23 AM
kebwi's Avatar
Il Pizzaiolo
 
Join Date: Aug 2009
Location: Seattle, WA, USA
Posts: 1,010
Default Re: Steel pipe vs. rebar-concrete-filled-PVC for a column

Hmmm, the kind I'm familiar with puts screws through the stand to touch the (and even penetrate) the tree. I was hoping not to drill holes in the nice aluminum pole. When we all discussed this method of anchoring the primary pole by sliding over a shorter thinner pole, was that the intention all along? --that I would bolt through both poles? I could do that, I just hate to ruin a nice pole. :-)

Was that the idea?

I guess I could just place some bolts through the inner pole which achieve an "outer diameter" of the inner diameter of the outer pole.
__________________

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
  #10  
Old 07-15-2012, 09:06 AM
Tscarborough's Avatar
Il Pizzaiolo
 
Join Date: Oct 2009
Location: Ausitn
Posts: 3,076
Default Re: Steel pipe vs. rebar-concrete-filled-PVC for a column

You just need one, and you could do it low if you like, although you will get more noise if you do so.
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
Steel pipe anchor plate importance/purpose? kebwi Tools, Tips and Techniques 1 10-20-2009 05:01 PM
Rebar set in concrete foundation Michael L Smith Newbie Forum 4 05-27-2009 06:51 PM
Alternative to concrete block foundation ekah Getting Started 6 12-02-2008 06:56 AM
Should rebar or steel poke thru foundation Dino_Pizza Getting Started 17 11-12-2008 11:00 AM
Casting vent wlively Pompeii Oven Construction 29 03-30-2007 07:17 PM


All times are GMT -7. The time now is 05:16 AM.

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