I'm going to have an iron. But what is the difference between hot and cold formed hollow sections

[Staffans2000]

Hello.

My newly built basement wall is being visited by the fill masses on the outside. They are pressing so much that the concrete blocks have cracked and are slowly starting to push the wall in.
Therefore, I plan to support it with square steel tubes.
There are both cold and hot-formed profiles. What is the difference?

Staffan

 

[Fredrik K]

Take a look here and you'll find a pretty good explanation:

https://www.begroup.se/produkter/stal-stalror/halprofiler/

 

[Rickard.]

Cold-formed are shaped cold and therefore become more precise in form and dimension.

 

[Autodidak1]

Hello.

My newly built basement wall is being visited by filler masses on the outside. They are pressing so much that the concrete blocks have cracked and are about to, albeit slowly, push the wall in. Therefore, I'm thinking of reinforcing it with square steel tubes. There are both cold and hot-formed profiles. What's the difference?

Staffan

A slightly under-dimensioned wall? Good to reinforce it. Is it possible to replace the filler masses with LECA pellets or Styrofoam lids? That's also a feasible way to reduce the problems.

 

[Staffans2000]

Thanks to all three..

 

[Staffans2000]

Slightly undersized wall? Good to reinforce. Is it possible to replace the filler materials with leca balls or polystyrene covers? That's also a feasible way to reduce problems.

That's the crux! I can't access to dig outside the foundation.

 

[Autodidak1]

That's the crux! I can't access to dig outside the foundation.

Bummer...

 

[Staffans2000]

Slightly misdimensioned wall? Good to reinforce. Is it possible to replace filling materials with leca balls or styrofoam lid? That is also a viable way to reduce the problems.

Obviously misdimensioned. Twenty-five-centimeter Lecablock was apparently too weak.

 

[Autodidak1]

Obviously undersized. Twenty-five centimeter Lecablocks were apparently too weak.

How much reinforcement did you use, wall height, and length without support?

Interesting to know, I have done 3 basements/slope terrain with leca and they have turned out well. I have used 20-30 cm leca depending on the wall length. I have used tips/rules of thumb from experienced bricklayers.

 

[Staffans2000]

Six meters by one point eighty underground. Reinforcement every other layer.

 

[A-Man_08]

The headline

 

[fsn]

Why not use an open profile instead? A pipe rusts internally if you don't intend to hot-dip galvanize or something like that.

 

[roli]

There is no need to hot-dip galvanize tubes or hollow profiles to prevent rusting. Firstly, as I understand, the profile is mounted on the inside of the wall where it is drier. If you seal both ends of the profile with welded-on plates so that it becomes an enclosed space, the inside will only rust as long as there is oxygen and moisture left inside the profile; when it runs out, the rusting stops.

A difference between hot and cold-formed profiles that has not been mentioned is that hot-formed square profiles have smaller radii on their corners than cold-formed ones. They are more "square," which provides more material where it is needed.

 

[corre]

Spontaneously, I think square profile is too weak, they don't withstand much bending force. UPE is more common in real estate, and it's also easier to mount against the wall with chemical anchors and threaded rod.
https://brommastal.se/stal/upe-balk/

How will you brace the beam? It needs some allocation for the force pressing against it.

 

[fsn]

You don't have to hot-dip galvanize pipes or hollow sections to prevent rusting. Firstly, as I understand, the section is mounted on the inside of the wall where it is drier. If you seal the section at both ends with welded plates so that it becomes an enclosed space, the inside will only rust as long as there is oxygen and moisture left inside the section, and once that is exhausted, rusting stops.

A difference between hot and cold-formed sections that hasn't been mentioned is that hot-formed square sections have smaller radii on their corners than cold-formed ones. They are more "square-like," providing more material where needed.

It is generally the case that an open profile is chosen. Then you don't have to bother with welding end pieces. However, they do tend to collect more dirt and dust.