How to build a smart bridge here?

[Falkberget]

I plan to replace today's loose dock with a fixed dock so I don't have to pull it up over the winter. Do you have any smart ideas and tips on how I should do it? The idea is to try to create a dock that is attached to the rock and hangs out about 3-4 meters over the water. The problem is that the entire Vänern exerts pressure, which means that any outer braces will be destroyed by the ice in the winter. How high above the surface should I build? See pictures: Image1 my rock. Image2+3 neighbors' solutions.

 

[jonaserik]

During ice break-up and onshore winds, the ice can press up several meters with the shoreline you have. So think about how far up the ice has reached, feel free to talk to the neighbors who have passed the retirement age, they might know a lot. If you're going to have it suspended, it will probably require pillars of H-beam at least 200x200, anchored to the rock with at least 24 mm expanders, which are best, or fasten a fully threaded rod; since it's freshwater, fully galvanized will do.

 

[Falkberget]

During ice break-up and onshore wind, the ice can push up several meters with the shoreline you have. So consider how far up the ice has stretched, and it would be good to talk to neighbors who have passed retirement age, they might know a lot. If you're going to have it hanging, it will probably be pillars of H-beam at least 200X200 anchored in the rock with at least 24 mm Exspander which is best or attach a fully threaded rod, since it's freshwater so fully galvanized will work.

Yes, the ice exerts enormous forces.

 

[jonaserik]

Yes, the forces from the ice are immense.

I have experience building docks in the archipelago, and in certain locations, the ice has climbed 3 - 4 meters onto land. Open water with straits outside, so tremendous ice pressure with onshore wind, and there was a rocky ridge. And not like you have with a sloped beach. You need to find out what ice pressure can occur on your beach and a bit around. There's probably no shortcut for your dock if it's going to stay there.

 

[Thomas_Blekinge]

Depends entirely on your local conditions. Your mountains provide good conditions for building a cantilevered pier without piles in the water. It requires sturdy beams, but you can simplify it with tall poles at the pier's attachments and cables from the front of the pier over the poles to an anchor on land. Like a suspension bridge.
Read the book "Bryggan" by Claes Dymling. Very valuable.
Here in Blekinge, the water sometimes rises 120 cm above normal but not more, today.