removing unused constructions in OpenStudio

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Hello, My model has a lot of unused contructions - it was created by combining 3 different floors into one in Sketchup using the merge spaces from external file script and for some reason, this resulted in a new construction for each surface (i.e. InsulatedWall1, InsulatedWall2, etc.. even though they are all identical).

I am now trying to delete all these unused constructions, but when I try to purge them in the constructions tab in OpenStudio, the program does not respond and crashes. Is there another way to quickly remove all of these?

Thanks Phan