Comment by mschuster91
10 hours ago
> EDIT: I'm assuming the difficulty here is the pedestrian ramps at intersections. NOT the curb that spans the entirety of a road section.
The curb elements are made offsite. All you do onsite is to cut the stones to length if need be.
The challenge is properly anchoring them into the surrounding soil, and for that you need a concrete foundation. Basically, you make a gravel (or concrete) foundation, then you put down the curb element onto a few small pieces of wood, then you make a sort of mold cavity, and then you pour that mold full of concrete. Once that has cured, you put gravel to have an equal height with the road's gravel foundation on the road side and either soil or gravel on the pedestrian side to grade height - gravel if you want to place paving stones for pedestrians, or straight out soil if you want a grass siding.
You can see a few pictures and diagrams on how we do it in Germany here [1].
Ah, that's not how they do it in Chicago.
In Chicago, they concrete form the curb on site.
https://blackhawkpaving.com/wp-content/uploads/2021/03/Concr...
Oh good god. I can see that cracking all the way to Germany. Concrete surfaces need stress relief.
They put expansion gaps at regular intervals.