Casting or piling around stone chest

[Bomski]

Hello!
I have a little dilemma with a dilapidated boathouse that needs some care.
The once supportive stone chest with poles has lost its frame around the chest, and the stones have started to spill out. Currently, the side of the boathouse facing the lake is held up by 3 old poles. The plan was to pile anew around the chest, but it turns out that rock surfaces quite quickly.

My question then is, would it be possible to repair the foundation and cast on the old stone chest instead? It's also claimed to be a cheaper solution.

 

[PNO]

The easiest way is probably to build new stone cribs? It will likely also be both the most attractive and cheapest option.

Otherwise, if it's close to bedrock, it is possible to dig out, set up forms, and cast a wall or pillars directly on the bedrock. For underwater casting to be successful, however, it needs to be possible to access with a concrete pump.

A third option I have used a couple of times on quays is to bring in a well driller who drills holes about half a meter into the bedrock and inserts casings. The casings are then filled with concrete, and then a wall is cast on top of the casings. Alternatively, brackets for wooden beams are welded the time it was to become a wooden quay.

 

[Bomski]

Have found a new solution after talking to some people. We will burn down the old boathouse and dig out the entire marina and place the boathouse on bedrock and the pier instead. That way, we don't have to think about piling. The footbridge that goes between them will of course disappear.

 

[fribygg]

Do NOT burn it down, renovate the existing structure as you likely cannot get permission to build something new.

 

[HSP]

2nd on that
It's not certain that you'll be allowed to build a new boathouse by the authorities.
My advice is to find that out first and get all the permits before "burning". Otherwise, you risk being completely without a boathouse...

I would have renovated the old boathouse with a new stone foundation in the old model, then you hardly need to worry for the next 50 years...

 

[fribygg]

2nd on that
It's not certain that you will get permission to build a new boathouse from the authorities.
My tip is to find that out first and get all the permits before "burning." Otherwise, you risk being completely without a boathouse...

I would have renovated the old boathouse with a new stone crib in the old model, then you hardly need to worry for the next 50 years...

Isn't it almost completely certain that you won't get permission for a new shoreline boathouse in a new location instead?

 

[HSP]

I think it is almost impossible to build new even on the old site. And even more difficult to dig out at a new site in the water.

 

[Bomski]

Have been in contact with the municipality and it would not be a problem as there is already an existing one there. However, it will not be demolished before there are clear plans and approvals from the municipality and new drawings from my side. Unfortunately, the boathouse is in such bad condition that saving it might be just as much work as building a new one.
It's also worth mentioning that this is in Åland and not in Sweden.
Piling was not possible. Tried today with a rebar and after 20cm hit rock...

 

[Bomski]

I think it is almost impossible to get permission to build again even on the old site. And even harder to get permission to excavate a new site in the water.

Excavation is allowed for 50 square without permission but not after April 14th. I don't remember exactly when they start again but it should be in October/November.

 

[fribygg]

I have been in contact with the municipality and it wouldn't be a problem since there's already an existing one there. But they won't be demolished until there are clear plans and approval from the municipality and new drawings from my side. Unfortunately, the boathouse is in such bad condition that saving it might be as much work as building new. It's also worth mentioning that this is in Åland and not in Sweden. Piling wasn't possible. Tried today with a rebar and after 20cm hit bedrock...

If you only have 20 cm to dig away, it should be entirely possible to drill down anchors and cast concrete piers if you wish.

That it's as much or more work to renovate is likely the minor issue, even in Åland; renovate so you do not lose the boathouse.

 

[HSP]

You probably have better or simpler rules in Åland. In Sweden, the municipality can give the go-ahead, and then after a while, the County Administrative Board stops everything.

And you're probably right that it's less work to build new than to renovate...

A few years ago, I renovated a boathouse because I knew I would never be allowed to build a new one by the water... The advice to renovate came from the municipality... It would have been easier to build new...

 

[Bomski]

If you only have 20 cm to dig away, it should be fully possible to drill down dowels and cast concrete piers if you wish.

That it is as much or more work to renovate is probably the small problem even on Åland, renovate so you do not lose the boathouse.

That's also a solution, yes. Tricky this