Lightweight Cap for 36" Concrete Pipe

Started by waggin, November 22, 2015, 08:26:26 PM

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waggin

Can anyone give me ideas for how to cover a 36" diameter concrete pipe with something lighter than the normal concrete cap?  It's being used as a spring box with the bell end down and is in an inaccessible location.  I have no clue how they got the 3' long section of pipe down there in the first place, but it must have been exciting unless there was some sort of boom truck involved.  In other words, it would be a crazy amount of work to get a standard concrete cap with inspection port to it, so I'm hoping there's some sort of poly/PVC/ABS, etc. cap available.  Thanks in advance.
If the women don't find you handsome, they should at least find you handy. (Red Green)

Redoverfarm

Maybe something like a septic tank riser cap.

https://www.google.com/search?sourceid=navclient&ie=UTF-8&rlz=1T4TSNA_enUS401US438&q=septic+tank+riser+cover

Or make one out of Marine Grade plywood and then put auto body fiberglass covering it.


rick91351

Well we did one such as you are asking about - we poured it about 3 inches think concrete reinforced with rebar.  In the center we placed a 3 or 4 inch piece of PVC to pass a riser through.  Three or four of us man handled in to place.  If I was to do over I would have formed it on place using a piece of sheet metal for the bottom used sheet metal to form the circle   Use a torch and cut out for the riser fasten in the PVC pass through and reinforce with rebar and mix the cement and carry it in buckets and fill the form very carefully..... 
Proverbs 24:3-5 Through wisdom is an house builded; an by understanding it is established.  4 And by knowledge shall the chambers be filled with all precious and pleasant riches.  5 A wise man is strong; yea, a man of knowledge increaseth strength.

waggin

Quote from: rick91351 on November 22, 2015, 10:01:32 PM
Well we did one such as you are asking about - we poured it about 3 inches think concrete reinforced with rebar.  In the center we placed a 3 or 4 inch piece of PVC to pass a riser through.  Three or four of us man handled in to place.  If I was to do over I would have formed it on place using a piece of sheet metal for the bottom used sheet metal to form the circle   Use a torch and cut out for the riser fasten in the PVC pass through and reinforce with rebar and mix the cement and carry it in buckets and fill the form very carefully..... 

Hoping to avoid the weight, as I'd like to be able to access the inside for cleaning and some future upgrades, but thanks for the idea.

Quote from: Redoverfarm on November 22, 2015, 09:19:31 PM
Maybe something like a septic tank riser cap.

https://www.google.com/search?sourceid=navclient&ie=UTF-8&rlz=1T4TSNA_enUS401US438&q=septic+tank+riser+cover

Or make one out of Marine Grade plywood and then put auto body fiberglass covering it.

I've been Googling like a fiend tonight, and the largest poly lid I found was a 36" OD, and I need just a hair more.  It has to cover about 38" OD to allow water to run off.  Granted, it's not household water, but I'd at least like to keep it sort of clean.  Right now, it's covered with a 6-panel door and a couple of pieces of rotten paneling, so anything would be an improvement!  A few years ago, I looked into this with the local concrete tank manufacturer, (who also sells poly tanks) and they didn't have anything.  Maybe I'll try them again.  If that doesn't work, I was thinking of looking for a granite, quartz, or other stone remnant from one of those countertop cutting places.  I could put that on with some of the canopy sealing foam tape.  Thanks for the brainstorming!
If the women don't find you handsome, they should at least find you handy. (Red Green)

flyingvan

Reminds me of the time we had to make some domes for the set of a play....We cut a 40" circle out of a sheet of 3/4" plywood then tacked a square of fabric loosely over the hole.  The plywood was supported off the floor on the corners.  We saturated the fabric with resin and let it set overnight--the fabric sagged into a perfect dome shape and set up solid.  Then we just ran a knife along the edge of the circle, popped it out, and repeated the process
Find what you love and let it kill you.


busted knuckles

Quote from: flyingvan on November 23, 2015, 11:05:57 PM
Reminds me of the time we had to make some domes for the set of a play....We cut a 40" circle out of a sheet of 3/4" plywood then tacked a square of fabric loosely over the hole.  The plywood was supported off the floor on the corners.  We saturated the fabric with resin and let it set overnight--the fabric sagged into a perfect dome shape and set up solid.  Then we just ran a knife along the edge of the circle, popped it out, and repeated the process

This sounds like a good idea. I am wondering about concrete with vermiculite or strofoam beads. Maybe add some chicken wire. Just throwing some ideas into the pot.
you know that mugshot of Nick Nolte? I wish I looked that good.

rick91351

Tossing the concrete lid in to the mix again because of an unexplained reason that being - grandkids. The couple concrete pipes buried down into the ground making a sort of spring box was a death trap.  We decided that the wooden lid with the sheet metal cover which held up well for about twenty years was no longer an option.  So we poured the concrete lid and got it in place instead of the wooden lid. No way are they going to get it off.  We now are thinking of digging out the concrete pipes and restoring the site as really it is no longer is serving any purpose. (Well and two much better positioned springs.)     
Proverbs 24:3-5 Through wisdom is an house builded; an by understanding it is established.  4 And by knowledge shall the chambers be filled with all precious and pleasant riches.  5 A wise man is strong; yea, a man of knowledge increaseth strength.