Building a pier, hot-dip galvanized or acid-proof??

[Anton75]

Hi, it's time to assemble the framework on the piled dock. The question now is whether I should choose hot-dip galvanized threaded rod or acid-resistant? Stainless steel is almost twice as expensive, and I wonder if it's worth it. Anyone with experience? The dock is located in the Blekinge archipelago.

Thanks in advance /Anton

 

[corre]

I would have chosen hot-dip galvanizing in large dimensions. Carriage bolt or threaded rod. Possibly protect ends with bitumen coating. I feel that stainless steel tends to rust/corrode anyway, unless you buy almost unreasonably expensive grades.

 

[Anton75]

Thank you for the response! How coarse would you have used? And what do you think about the risk of the hot-dip galvanized rusting away after a number of years? Or should today's withstand it. Considering using hot-dip galvanized (HGS 8.8) M 20.

 

[corre]

With hot-dipped galvanized M20, it will be your children tearing down the bridge with a reciprocating saw in 40 years

 

[MathiasS]

We went up a couple of dimensions and used galvanized + a bit of paint on the nuts. Still looks nice several years later. Acid-resistant is overkill.

 

[HansR]

I think you should ignore syrafast. There is a risk that the bridge will rust apart.

 

[ullberg]

We upgraded a couple of dimensions and used electroplated zinc + some paint on the nuts. Still looks nice several years later. Acid-resistant is overkill.

Just electroplated zinc? Not hot-dip galvanized? And it holds up well in a humid environment? I wouldn't have thought so, but I have no reason to doubt you. Is it, if I remember correctly, an inland lake rather than the sea that you live by?

To TS, I agree with the others, zinc-plated (although I think one should go for hot-dip galvanized) often works very well. In the countryside in Roslagen, we have a pier where almost all parts are hot-dip galvanized, over 10 years later and there's very little rust.

/U

 

[Anton75]

Thanks for the answers, varmgalvat it is!

 

[ullberg]

Sounds good, I think you'll be satisfied. However, I think what you want is hot-dip galvanized (VFZ / FZV) rather than galvanized.

At least in my mind, there's a difference between these. VFZ is a dip in zinc, galvanized is an electrolysis with zinc according to me, but I'll probably be corrected if I'm wrong

And people mix these up quite a bit. If you say _hot_galvanized (which I actually don't think is possible) you probably mean hot-dip galvanized, so the risk of mixing them up is probably small, but know-it-alls like me are happy to make an extra comment

/U

 

[MathiasS]

only electro-galvanized? not hot-dip galvanized? and it holds up well in a humid environment? I wouldn't have thought so, but I have no reason to doubt you. Is it right that I remember it being a lake rather than the sea you live by?

To TS, I agree with the other speakers, galvanized (even though I think one should choose hot-dip galvanized) often works very well. In the countryside in Roslagen, we have a dock where almost all parts are hot-dip galvanized, over 10 years later and there is very little rust.

/U

Yes, shiny items, not galvanized.

http://www.mugglo.net/byggteknik/brygga/

Baltic Sea water.

 

[ullberg]

Yes, 5157 undeniably looks very galvanized, if it works well my bridge should last until the land elevation makes it unusable

I see in your quote of my text that I must have had a brain hemorrhage, I almost gag when I see my own spelling of galvanized, and not just once either, I apologize for that...

 

[MathiasS]

Exactly. Särp yourself.

 

[thomasx]

I had never thought of using anything other than syrafast.

Cross-posting not okay, if I remember correctly!

 

[Anton75]

Yes, shiny items, not galvanized.

[link]

Baltic Sea water.

Big thanks for the pictures, I got a lesson in construction art as a bonus!

 

[MathiasS]

It would never have occurred to me to use anything other than acid-resistant.

Cross-posting not ok if I remember correctly!

Nor me. But the price for acid-resistant in these quantities is not proportionate to the benefit of it, and evidently it went well anyway. Moreover, it is very easy to replace a joint IF it should rust after 15 years.