claims of gang rape and physical abuse at qld orphanage have emerged .
allegations came out during royal commission hearing in rockhampton .
one woman said she was allegedly raped with a broom handle by abuser .
same victim claimed she became pregnant at 14 after she was gang raped .
while a retired nurse said she had been punched and slapped repeatedly .
a third victim said she was raped more than 100 times by a parish priest .