You wouldn't use the same design techniques for these that you would for traditional construction. You probably could make a bridge to take light traffic (hell

You wouldn't use the same design techniques for these that you would for traditional construction. You probably could make a bridge to take light traffic (hell, these were being built well before rebar was invented), but it wouldn't look familiar. If you did want to go that way, though, I'd look at one robot to set up a rebar mesh, another to climb up that scaffold to form a mold around the mesh, then a third to compact a concrete pour between the two.