Line to shape

Hey!

I have created this arches. (You can see them on the first picture below)

Now I would like to create a shape for these curves. So I tried it, but the problem is:

They aren't in the same direction. (2nd Picture below) Some of them are vertical and the others are horizontal. My aim is to make all of them vertical.

What I have to do to make them all vertical?

On the third picture you can see, how I created this shapes in grasshopper, but it was no yielding result.

I hope someone can solve my problem!

Thanks!

Best wishes from germany,

Bonobert