Casting walls in concrete ??

[skotten111]

Hi!

New here and almost fainting when I start reading all the threads,,,, It will take me 14 days just to look at the surface haha

Question 1

Why don’t they cast walls in new constructions? Like I'm going to build a garage where half will be below ground and the rest above. It will connect to an old garage where the walls are cast from the 40s. These walls are completely dry and have never attracted moisture.

Question 2

If one were to decide to do it this way, how much can you cast at once without everything collapsing and going to hell? There will be quite a bit of weight if it's supposed to be like a 2-meter wall...

Question 3

Did you understand what I want to know??

 

[Donwoody]

1. would probably guess the price, it can get quite expensive to cast if you can't wheelbarrow or tip with the concrete truck into the form,

2. depends on how well you've nailed the form together, and how stable it stands

3. think so

 

[LLLVäxjö]

There is a heck of a pressure when casting at height. The highest I've cast in place is a 1.2m high wall, and it was close to the formwork (homemade) holding up. I did it in two rounds, and the problem then was that the formwork gave a little during the second casting, so the upper part became a bit thicker and some concrete ran along the lower part. However, it turned out decent in the end.

This is what the professionals' formworks look like:

http://www.betongbanken.com/index.aspx?s=2983

You probably need something similar if you want a nice result.

 

[zankan]

you use svemastag to maintain the shape, allowing you to cast up to 6 m in height. And the reason loose formwork and casting are seldom nailed is due to cost and drying times. Prefab eliminates a lot of drying time, which means the surfaces can be finished earlier... meaning you earn money sooner...

Max form pressure occurs with full-flow concrete, as well as depending on the rise height. Meaning how much you pour in.

 

[skotten111]

Fun with answers thanks!!

How does it hold up from an energy standpoint then??

there isn't much air in a cast wall directly...

 

[anaitis]

Fun with answers thanks!!

How does it stand from an energy point of view then??

there's not much air in a cast wall directly..

One can really disregard any insulation contribution from concrete.
However, it is an excellent material when considering thermal inertia, i.e.
heat storage that smooths out temperature fluctuations.

 

[BosseHansson]

http://www.swelet.se/gallery1_48.html
Saw it a couple of days ago. Have only seen those Lego cubes with the same principle before.

 

[mycke_nu]

http://www.byggahus.se/forum/stenhus/86997-gjuta-prefabvaeggar-sjaelv.html

Check out especially the post about http://www.maskinisten.net/viewtopic.php?t=5586