Olaf and Gunvor Storerui

I wonder if anyone know anything about Olaf Knutsen Storerui and Gunvor knutsdatter Storerui. They emigrated with Rjukan 1869, but I have not been able to follow them in USA. I think Olaf was born in 1851 and Gunvor in 1841, both in Fyresdal. Thanks! knut