how to open a big file from rhino into archicad

Hello to everybody

Guys i have a problem, how can i export my file from Rhino into Archicad? The file is quite big like 20Mb , i have tried a lot of ways but without success. I mean i export the file from Rhino as Dwg, and when i open it in archicad from Libraries and Object, my model is not active in Archicad, the tool box is hidden. Could you help to solve this problem please!!!