Eli5 how brick bridges are built.

Question

I’ve been watching a narrowboat channel from England and there are very many beautiful brick bridges with a nice arch over the canal. I understand how the arch holds the bridge up.

I don’t understand how they built the arch in the first place without the bricks falling. They were built a couple hundred years ago.

In: 73

Answer 1

There are different techniques. For example you can first build a wooden frame and place the brick arcs on them so they don’t fall down before the entire thing is finished.