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[QUOTE="sutomcat, post: 3315046, member: 27"]
I think the big things the workers need to do after a new girder has been put in place are

1) bolt it to the adjacent girder.  There are a ton of holes along the outside perimeter of each box girder.  Once the girders are properly aligned, those holes (I would estimate 80-100) are lined up and I assume they use giant bolts and nuts to connect them to each other very securely.  The holes are big; it looks like I could fit 2 of 3 thumbs in one.  Maybe 2.5 or 3 inches across.

So I think they have to get the bolts in place, tighten the nuts and then attach the girder cables to the back stays.  For the girders on the west wall, they also need to attach a second spiral, this one diagonal.

Once all this is done, they can release the cables tied to the collars of the spirals just installed, as they are no longer needed (the cables attached to the box girders now hold the box girders in place).

There might be other things they need to do but that is all I see happening,

Regarding the height of the crown truss, at its apex, in the middle of the east and west walls, it will be 80 feet above the top of the dome walls.

I think box girder just installed is the center one for the west wall.  I believe this is as high as the crown truss will go.  Pictures of the crown truss from the ground looking east, say for Irving, are going to look really cool.  Can’t wait for the first to appear.
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