Threaded rod under pier

[Rattan]

I am renovating my dock. It has previously been supported by quite a few and thin threaded rods. Now I have cast a couple of foundations where it seems to be needed the most. But the idea of threaded rods feels convenient. The dock lies on large stones, and my plan is to drill in rods with a diameter of at least 12 mm, into the stones. Additionally, a plate under the load-bearing beams in the framework. Water can splash sometimes, of course, but otherwise, the rods will be above the waterline. The dock is 16 meters long and about 4 meters wide. I would gladly welcome tips and advice on this.

 

[jonaserik]

Goes well but use stainless steel rods and nuts. Then if you think that 12 mm will hold, they are tensile and extension nuts are available. Otherwise, 16 mm might be a bit rough in your case. How have you planned to anchor them in the stone? In most cases, they are put straight through the dock construction to hold it together better. Available at Classes.

 

[Rattan]

Works well, but use stainless steel rods and nuts. If you think that 12 mm will hold, they are strong in tension and there are coupling nuts available. Otherwise, 16 mm might be a bit too thick in your case. How have you planned to anchor them in the rock? In most cases, they are placed straight through the jetty construction to hold it together better. Available at Classes.

I plan to drill into the rock and screw down the rods. If it's possible? I don't really know what tools are needed for the screwing. Or maybe drill holes and fill them with some kind of mass?

 

[jonaserik]

You will never get a secure grip by trying to thread a rod into stone or rock. It must be anchored with something. There are many ways, anchoring compound/sulfur etc. Read a bit here and click further, maybe a flash of genius will appear. Then regarding ice pressing, that's another issue. It gets even worse
https://www.google.com/search?rlz=1...vEDHZ7AA1gQ1QJ6BAhHEAE&biw=1600&bih=827&dpr=1

 

[Rattan]

You will never get a secure hold by trying to thread a rod into stone or rock. It must be anchored with something. There are many ways, anchoring compound/sulfur etc. Read a bit here and click further, maybe a stroke of genius will appear. Then how it is with ice pressure is another matter. Then it gets even worse
Yes, I suspect so. Thanks for the great tips, I will study in detail. The ice does not reach the anchors, so it shouldn't be a problem, but the pipes must still be securely fastened.
[link]

 

[Thomas_Blekinge]

I am renovating my dock. It has previously been held up by relatively few and thin threaded rods. Now I have cast a couple of footings where they seem most needed. But the idea of threaded rods feels convenient. The dock rests on large stones and my plan is to drill rods with a diameter of at least 12 mm into the stones. Additionally, a plate under the supporting beams in the framework.
Of course, water can splash sometimes, but otherwise, the rods will be above the waterline. The dock is 16 meters long and about 4 meters wide.
I am happy to receive tips and advice on this.

I plan to build my next dock in a similar way. Southern Baltic Sea, so there is salt in the water. I will drill holes for M16 stainless steel A4 threaded rods. I sometimes have ice, so they need to handle side forces. The rods will be secured with some marine-resistant anchoring adhesive.
Then I will build a crossbeam also of RF and the framework on it.
In my old dock, I had parts of galvanized above water, and it didn't even last 10 years.
I have gained respect for the forces of the sea!

 

[Rattan]

I plan to build my next dock in a similar way. Southern Baltic Sea, so there's salt in the water. I will drill holes for M16 stainless steel A4 threaded rods. I sometimes have ice, so they need to take side forces. The rods will be fixed with some sea-resistant anchoring mass.
Then I will build a crossbeam also from stainless steel and the framework on top.
In my old dock, I had galvanized parts above the water, and it didn't even last 10 years.
I have gained respect for the sea's forces!

Do you fix the rods in the drilled holes with anchoring mass then? You don't screw them in but make the holes slightly larger in diameter?
How do you plan to attach the beam to the rods? I will have 195 wooden joists and am considering if a plate would be enough.

 

[jonaserik]

I plan to build my next pier in a similar way. Southern Baltic Sea, so there is salt in the water. I will drill holes for M16 stainless A4 threaded rods. I have ice sometimes, so they need to take lateral forces. The rods will be attached with some marine-resistant anchoring mass.
Then I will build a crossbeam also of SS and the beam structure thereon.
In my old pier, I had parts of galvanized, above the water, and it didn't last even 10 years.
I have gained respect for the power of the sea!

If you don't have bedrock but loose larger stones/blocks, try to get 16 mm rods straight through the pier with logs as anchors on both sides. I have worked in the archipelago with those who build piers.

 

[Rattan]

If you don't have bedrock but rather loose larger stones/blocks, try to get 16 mm rods straight through the dock with logs as anchors on both sides. I have worked in the archipelago together with those who build docks.

Hm, can you elaborate a bit on what you mean by having the rods go straight through the dock with logs as anchors? (I'm completely new to this).

 

[jonaserik]

You say 195 timber. On the outside of the dock, there will likely be some form of timber with standing posts to attach to. These are the ones that need to be anchored to prevent tipping outward. Then you will need to put iron/rod straight through the dock and pull the posts together to hold it in place. As large washers as possible or 5 mm stainless steel plate as a washer is good. Are you following, or should I make a simple sketch?

 

[Rattan]

You mention 195 timber. For the outside edges of the dock, there will likely be some form of timber with standing posts to attach to. Those are the ones that need to be anchored to prevent tipping outward. So, you would have to place a rod/bar straight through the dock and pull the posts together to keep it stable. As large washers as possible or 5 mm stainless steel plate as a washer is good.
Are you following, or should I make a simple sketch?

Laugh! You understand that I'm a complete novice. I'd appreciate a sketch if it's not too much trouble for you.

 

[jonaserik]

Here comes a simple sketch

 

[Rattan]

Here's a simple sketch

Ah, now I understand what you mean by "through the bridge." Thank you so much for the help!

 

[Genomklok]

Don't forget to report water activities to your county administrative board and get it approved before you start working in the water.

 

[Thomas_Blekinge]

Laughter! You understand that I am a complete novice. Please provide a sketch if it's not too much work for you?

He tends to be quite unclear.