Originally Posted by Razqal
i dont see how you can build a foundation without building a hole from the surface. usually you just dig a big hole and pour concrete for the retaining walls and floors and then put in the pillars for the structure, etc. like at world trade center new york city:
(look how big and deep this hole is)
Everything I say in my last respond is depend on these photos I posted, but I not an engineer. I just say what I saw from photos and also some infromation from skyscrapers.tw. And, the A1 station is in process, it is part of the foundation of this twin tower. From this point, I guess the underground construction is still going and we just can not see from surface.
I also hear from skyscrapers.tw, they use some construction tech same as use for tunnel.
Unfortunately, I'm not engineer......
I really think it is better ask engineer staff.
And there are a lot of construction tech, maybe it is one you not often see in Amercia.