Hello,
I would like to support my wooden terrace with stainless steel pipes (DN130, 2 mm thick). The material used is 1.4301. The pipes will be installed in frost-resistant foundations.
I have two questions:
1. Does this stainless steel have any issues with direct contact with concrete? Can I place the pipes directly into the foundations, or should I coat them or take other precautions?
2. If I fill the pipes, which protrude about 1 meter (3 feet) above the ground, completely with concrete, should I expect damage from frost because moisture cannot escape from the pipes? The reason is that I need to cast a concrete anchor at the top as a holder.
Possibly, I would press in a styrofoam plug about 30 cm (12 inches) below the top edge of the pipe and then pour concrete over it to hold the concrete anchor.
Thank you for your help!
Regards, Rainer
I would like to support my wooden terrace with stainless steel pipes (DN130, 2 mm thick). The material used is 1.4301. The pipes will be installed in frost-resistant foundations.
I have two questions:
1. Does this stainless steel have any issues with direct contact with concrete? Can I place the pipes directly into the foundations, or should I coat them or take other precautions?
2. If I fill the pipes, which protrude about 1 meter (3 feet) above the ground, completely with concrete, should I expect damage from frost because moisture cannot escape from the pipes? The reason is that I need to cast a concrete anchor at the top as a holder.
Possibly, I would press in a styrofoam plug about 30 cm (12 inches) below the top edge of the pipe and then pour concrete over it to hold the concrete anchor.
Thank you for your help!
Regards, Rainer
haeuslebauer24 Jun 2010 08:56Structural Calculation by a Professional
Hello Rainer,
This sounds very interesting, but these are questions that really only a structural engineer can accurately calculate. Unfortunately, your message does not specify how much point load is applied to the individual supports of the terrace. What is the area that needs to be supported? How many supports are required?
One thing to consider is that the pipes alone, with a nominal diameter of 130 mm (5 inches) and a thickness of 2.0 mm (0.08 inches) (are these chimney pipes?), are by no means suitable or sufficient for structural purposes. Even the weld seam itself can ultimately be a potential weak point. Embedding the stainless steel pipes in concrete has no negative effects on their surface. However, care must be taken that the steel reinforcements, which are generally rusty, do not come into contact with the stainless steel. Otherwise, galvanic corrosion will occur, causing the stainless steel to rust as well. This cannot be remedied later by pickling.
I would recommend consulting a local structural engineer to get the relevant information. It would be a shame if something happened to the beautiful terrace.
Have fun.
Hello Rainer,
This sounds very interesting, but these are questions that really only a structural engineer can accurately calculate. Unfortunately, your message does not specify how much point load is applied to the individual supports of the terrace. What is the area that needs to be supported? How many supports are required?
One thing to consider is that the pipes alone, with a nominal diameter of 130 mm (5 inches) and a thickness of 2.0 mm (0.08 inches) (are these chimney pipes?), are by no means suitable or sufficient for structural purposes. Even the weld seam itself can ultimately be a potential weak point. Embedding the stainless steel pipes in concrete has no negative effects on their surface. However, care must be taken that the steel reinforcements, which are generally rusty, do not come into contact with the stainless steel. Otherwise, galvanic corrosion will occur, causing the stainless steel to rust as well. This cannot be remedied later by pickling.
I would recommend consulting a local structural engineer to get the relevant information. It would be a shame if something happened to the beautiful terrace.
Have fun.
Hello,
Thank you very much for the detailed response! I was out of the country for a few days, which is why I’m replying late.
I am using a complete aluminum construction system for the terrace, for which a company has calculated the structural design. The pipe strength was assessed as more than sufficient. I will also fill them with concrete.
The majority of the moisture should have diffused out by next winter, which hopefully is still a long way off.
My only concern was stress corrosion cracking, which can be an issue in chemical applications, for example.
So, thanks again and all the best!
Rainer
Thank you very much for the detailed response! I was out of the country for a few days, which is why I’m replying late.
I am using a complete aluminum construction system for the terrace, for which a company has calculated the structural design. The pipe strength was assessed as more than sufficient. I will also fill them with concrete.
The majority of the moisture should have diffused out by next winter, which hopefully is still a long way off.
My only concern was stress corrosion cracking, which can be an issue in chemical applications, for example.
So, thanks again and all the best!
Rainer
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