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Suggestions please - Double wall culvert for concrete tube form

B

bczoom

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I have a 16' 4x6" post in the ground I'm going to use as a utility pole. It's already in concrete to nearly ground level.
I want to reinforce the bottom 2-3' as it's sort of in a driving area and don't want it knocked over.

I plan on taking a 3' piece of double-wall plastic culvert pipe and using that as a tube for when I'm pouring the concrete.

A couple questions:
I was going to cut the culvert in half vertically so I can get it around the post. I'd then ratchet strap it tight in place before pouring. Does this sound like a good plan?
What, if anything, should I coat the interior of the culvert with so I can easily remove once the concrete hardens? Fluid film, oil, grease, nothing?

The piece of culvert pictured is about 4'. I'm going to cut it down.Resized_20251016_120628.jpeg
 
Fluid film would be my choice for a release agent. But I have not tried it myself. It seems to coat rather well, and I doubt cement would adhere to it well. Your method should work I think as well.
Good luck!
 
If you can, I would recommend rebar pins into the existing concrete. Also. Be careful about putting a lip that Frost can lift the soil under. I purchased a house that someone had done this and over time it actually will push the concrete up in freeze thaw scenarios. Otherwise, sounds like you've got a great plan. I have used diesel as a release agent before. I don't know that I recommend it. But it does work. I used double wall culvert on my deck piers. The culvert is still on it as additional protection.
 
The current (below ground level) concrete is domed to pitch any water away from the post. I'll see if I can get some vertical rebar in that area coming up to the new pour.
I was also thinking of drilling through the 4x6 in a few places and running horizontal rebar criss-crossed into the new crete.
 
Kevlar said:
Why not just use a cardboard piling tube, only a few bucks and then just peel it off after?
Click to expand...
Being a 4x6" post, I wanted something around 18". Couldn't find any tubes in that diameter easily (e.g. the box stores).
I called our town's road supervisor inquiring if they had any 18" scrap. They did, so I'm going with that. ;)
 
You can get bigger diameter ones, this was just an example, but free is always better 😉. I would cut the culvert in two and ratchet strap them together around the post, it will come off no problem after if it's the same type of culvert I'm thinking of, smooth surface on the inside.
 
Kevlar said:
I would cut the culvert in two and ratchet strap them together around the post, it will come off no problem after if it's the same type of culvert I'm thinking of, smooth surface on the inside.
Click to expand...
That's exactly what I'm doing. Cut the culvert yesterday, just need to go out and get some Sacrete and start pouring.
 
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