Baked Brep as a solid/surface

Hey guys,
i made a parametric bridge in grasshopper.

But when i want to export it as .dwg the output, when i reopen it in rhino or any other cad software is not a solid object but just the construction lines.
Change settings to 2007 solids does not change anything…GH Brücke.3dm (188.5 KB) GH Brü (9.9 KB)

Maybe you have edited the AutoCAD Export Scheme?

I attached a DWG export of your bridge. Imported in Rhino again, it shows a polysurface.

PS: you can copy / paste screenshots

GH Brücke.dwg (30.4 KB)