Well, personally, I
don't.
I've worked for enough other contractors who sought that kind of work, but they had a large number of employees and could guarantee a quota...
The best 1st step, IMO, would be to take a few large construction contractors to lunch...There are also trade papers who announce bid requests, and the legal announcements in most local newspapers tend to include bid requests, at least on a governmental/civil project level...
Wish I was more help.