Building a dock on rock by the sea

[Derbyboy]

Hello,

I am planning to build a dock on the rock by the sea. It's tricky to make a longer dock because it's not possible to get a good landing on the shore side. Additionally, I suspect it is a tough area as the ice pushes up in the winter.

Planned dimensions are 3.5 meters long, with 1.5 meters extending over the water and 2 meters wide. I plan to use 100x200mm beams.

I am thinking of building the dock like this:



I will need some form of brace right at the shoreline. At first, I thought of casting it, but I think the ice will remove such a construction. Therefore, I'm considering a brace made of threaded rod that will support the dock similarly to a prop. I will remove the threaded rod x 2 in the winter.



What do you think?

 

[Mats-S]

What do you think?

Absolutely right thinking.
If it gets unstable, you can also put some logs at the end for support, removed before the ice settles

 

[Derbyboy]

It will be difficult to keep the logs in place against the flat rock.

I wonder if the ice would take a piece of Gängstång sticking up 3-4 cm from the rock?

If not, then I have very good conditions to attach support legs and such.

 

[Derbyboy]

What also feels uncertain is if M20 threaded rod is enough. Feels a bit weak.....The height could be around 60-70 cm