I have not visited the site and do not have the drawings. I just make a guess.
問題:
1.)如何利用L8的吊架把L3的支撐架吊上至L6/L7的位置?
1. Tie wires connect each end of each frame to the material hoist.
2. material hoist raises the frame up.
3. make level difference of the two ends of metal frame by different lengths of tie wires.
4. locate and unload the frame.
At 3., it is the most critical as the tie wires at the lower end take up most of the load of the frame.
2.從圖中所見,放在L3的支撐架是如何運送至L3呢?
Is there a loading / unloading area / emergency vehicular access / bus terminus at L3? If so, they can just pull the frame in.
However, of this massive size. I think they assembled the frame at L3.