China's Amazing Bridges (photos and some text)

Discussion in 'Architecture & Engineering' started by Billy T, Jul 16, 2010.

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  1. Billy T Use Sugar Cane Alcohol car Fuel Valued Senior Member

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    See 36 of them (world's longest, one a multi-turn helix*, many very beautiful, some over shallow international ocean waters, one 36Km wide between land points, etc. some with very unusually support structures) at: http://www.slideboom.com/presentations/184256/China'sAmazingBridges-2003v[1]

    Be warned it is a mass of data so may down load slowly, but start it and do something else - they are well worth seeing. At least open site, page down, and read immediately the paragraph of text about several of the bridges.

    *This is a bridge that changes the road level in short space. Norway has some helix tunnels inside mountains to do this vertical change too.
     
    Last edited by a moderator: Jul 16, 2010
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  3. Shadow1 Valued Senior Member

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    do you know that bridge that flips from honk kong to china? because cars in honk kong drive like in u.k., and in china drive in the normal way; check the link
    http://www.ibda3world.com/?p=15161

    the video is too slow, i couldn' watch it or wait it

    Please Register or Log in to view the hidden image!

     
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  5. Shadow1 Valued Senior Member

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    waaaw, those bridges are insane hehehe,
     
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  7. Billy T Use Sugar Cane Alcohol car Fuel Valued Senior Member

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    Yes. It is a lot of data as the resolution is so high you can see the individual cables etc. Let it download in a different window while you work on something else. Then you can quickly step thru all 36 photos.
     
  8. Shadow1 Valued Senior Member

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    yeah it's ok, i saw it, it was in my second comment
     
  9. cosmictraveler Be kind to yourself always. Valued Senior Member

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    The structures are very well built however I'd think that with todays advanced tunneling methods that the tunnel would be the way to go for many reasons. Fewer of the Earths resources would be needed to build a tunnel as compared to a bridge and there's very little maintenance compared to a bridge as well. Thank you for providing the interesting photographs.
     
  10. S.A.M. uniquely dreadful Valued Senior Member

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    Awesome! Marvellous feats of engineering
     
  11. Billy T Use Sugar Cane Alcohol car Fuel Valued Senior Member

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    Name a few. They are making a long tunnel under the Bosperous (Turkey to Greece) but it is for trains, not cars.

    When trying to cross (or go under) wide waters, ventilation of car exhaust is nearly impossible, I think. That is why China built a 36Km bridge over water.
     
  12. cosmictraveler Be kind to yourself always. Valued Senior Member

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  13. Billy T Use Sugar Cane Alcohol car Fuel Valued Senior Member

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    Not long under water ones for cars - the digging is same but the ventilation problem keeps those tunnels short.

    I quote from your Wiki link: " Choice of tunnels vs. bridges : “ For water crossings, a tunnel is generally more costly to construct than a bridge."*

    Billy T comment: As I said, going under water makes ventilation for car exhaust very difficult and expensive (if not impossible) if the tunnel is long. – I doubt there is even one 6Km long under water tunnel anywhere in the world.

    So economics and practicality both dictates bridges over water rather than tunnels under the water for the longer, difficult to ventilate spans.

    The Chinese even have a serious engineering study now for a bridge from the mainland to Taiwan!!! (Presumably for fast approaching day when Taiwan has the same “one country –two economic systems” as Hong Kong, Mandau and a few other parts of China now have.)
    --------
    *For example the Lincoln and Holland tunnels of NYC are under relatively narrow parts of the Hudson river. The Verasanno Narrows BRIDGE was built later when tunnel construction was even cheaper and quicker, yet still there is no tunnel there where span is wider as a bridge is the economical choice.

    Thus, not only theory but practice also says tunnels under water for cars get too expensive every quickly with increase in length {mainly because of the ventilation problem, which you ignore when focused on the cost of digging the tunnel only.}
     
    Last edited by a moderator: Jul 16, 2010
  14. Facial Valued Senior Member

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    I've given up on trying to peruse China's ambitious collection of bridges. Every time I look the list becomes outdated.
     
  15. Gremmie "Happiness is a warm gun" Valued Senior Member

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    Very impressive.
     
  16. Billy T Use Sugar Cane Alcohol car Fuel Valued Senior Member

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    Do you mean there are different bridges to be seen? It down loads slowly to me in Brazil, so I have not looked again.
     
  17. Facial Valued Senior Member

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    They're building the bridges very fast, and I don't check often. If I checked every week then I could easily catch up.
     
  18. Walter L. Wagner Cosmic Truth Seeker Valued Senior Member

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  19. wow Billy. For the most part, those bridges were amazing. Shadow the video that was in your link doesn't work anymore.
     
  20. X-Man2 We're under no illusions. Registered Senior Member

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    Hope you don't mind Billy here is the bridge Millau Viaduct in France.It's the longest and tallest with the tallest piers, vehicular bridge in the world.Lots of pics.More Amazement!

    http://tinyurl.com/2dl6nes
     
  21. Giambattista sssssssssssssssssssssssss sssss Valued Senior Member

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    That's an interesting behemoth. Thank you.

    Anyone ever played BridgeBuilder/Pontifex/Bridge It??? Kinda fun.

    http://www.chroniclogic.com/main.htm
     
  22. Gremmie "Happiness is a warm gun" Valued Senior Member

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    Man, is that ever a tall bridge..

    Makes me wonder...How many people have jumped off of it?..

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  23. Giambattista sssssssssssssssssssssssss sssss Valued Senior Member

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    Speaking of tall, that really long one in China, or the one in France, frankly I think I would be a little scared of going near either of them. I've always been a little nervous about bridges, and really massive architecture is also imposing in its own right. Combine the two, and the incredible height of the viaduct, and I think you have a recipe for freaking out.
     
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