Casting Columns in Cardboard Tubes

[micsor]

Hi, does anyone know how much (how high) you can pour into a cardboard tube above ground before you have to let the concrete cure? I have cast bases on which I have placed 120cm tubes (diameter 19cm, 4mm cardboard thickness) and now it's time to fill the tubes. I guess they won't hold if filled in one go and you have to let the concrete cure after filling a few dm.

 

[Daniel 109]

The pipes can withstand a lot of internal pressure. They are unlikely to break, the question is what it looks like at the end. Is it buried?

 

[micsor]

The pipes withstand a lot of pressure from the inside. They probably won't break, the question is how it looks at the end. Is it buried?

We pushed them down a few centimeters into the base when we cast it, so it shouldn't leak underneath. It is possible to backfill 10-40cm of material outside the pipes; we thought of doing that once we've poured enough concrete.

 

[rävlyan]

With such long posts, you need to have iron in them, it's best if you can secure them in the base. Now that you have already set the pipes, insert 2 pieces of 10 or 12 iron that go from the bottom and stop about 5 cm from the top. Vibrate well so all the air escapes, using a hammer drill against the pipe (just hold it) and add a little concrete at a time, so you see it wetting the surface.

 

[micsor]

With such long posts, you need to have iron in them, it's best if you can get them attached to the base. Now you have already set the pipes. Put in 2 pieces of 10 or 12 iron that go from the bottom and stop about 5 cm from the top. Vibrate well so all air goes out. It works well with a hammer drill against the pipe (just hold it) and add a little concrete at a time so you see it waters on the surface.

Great! Thanks! We already had a 16 iron in the base but will complement with a 12.