Dear fellow engineers:
Let's see what ideas you can come up with to solve this problem. With the first truss cribbed and pinned together in place on the bridge abutments it is time to place, rig and raise the 25' long gin poles that will be used to raise the truss to vertical. This is no small task as each weighs in at between 450 and 500 pounds.
First problem, getting the poles from my house to the bridge site.
Who knows maybe someone out there has even a better idea. I'll post my solution and how I did it in a week or two.