EVER SEEN A RIVER OVER A RIVER?
本帖最後由 lilitan008 於 2011-10-3 12:57 PM 編輯 ; o% D. a' }- U. Z7 K
: P" G+ ]; b# \+ f2 MIf you are not a Physics person, read on and learn a fact of physics. tvb now,tvbnow,bttvb- ~5 Y" S% y! V4 e4 n% q6 z
AMAZING!
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Even after you see it, it is still hard to believe!
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1 i% d0 @7 K2 AMagdeburg Water Bridge in Germany What a feat! Six years, 500 million euros, 918 meters long. Now this is engineering! 公仔箱論壇" K: A6 }# s7 s/ \. ]/ P( G% d
This is a channel-bridge over the River Elbe and joins the former East and West Germany as part of the unification project. 公仔箱論壇! q" O+ [% ^: f# f
It is located in the city of Magdeburg, near Berlin.5.39.217.76 o# S3 V0 \+ `" I1 v! Y
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The photo was taken on the day of inauguration.公仔箱論壇4 N9 y$ k! _# b
To those who appreciate engineering projects, here's a puzzle for you armchair engineers and physicists.
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Question:
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" C$ E* N) m1 d6 ?! QDid that bridge have to be designed to withstand the additional weight of ship and barge traffic,& T) k6 B7 |% j( K$ n3 ?
Or just the weight of the water?
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Answer:
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5 u6 g# l( W- T F gIt only needs to be designed to withstand the weight of the water! 5.39.217.76; _4 n7 u" r( [. O7 n+ ]
Why? A ship always displaces an amount of water that weighs the same as the ship, regardless of how heavily a ship may be loaded
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: ?8 [0 h1 i; g5.39.217.76The Incredible Magdeburg Water Bridge in Germany5.39.217.76% s' T1 [4 B% v. P9 |1 e
The Magdeburg Water Bridge is a navigable aqueduct in Germany that connects the Elbe-Havel Canal to the Mittelland Canal and allows ships to cross over the Elbe River. At 918 meters, it is the longest navigable aqueduct in the world.
8 E* f0 [2 q; y1 _The Elbe-Havel and Mittelland canals had previously met near Magdeburg but on opposite sides of the Elbe Ships moving between the two had to make a 12-kilometer detour, descending from the Mittelland Canal through the Rothensee boat lift into the Elbe, then sailing downstream on the river, before entering the Elbe-Havel Canal through Niegripp lock. Low water levels in the Elbe often prevented fully laden canal barges from making this crossing, requiring time-consuming off-loading of cargo.
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Construction of the water link was started as early as in the 1930s but due to the World War 2 and subsequent division of Germany the work remained suspended till 1997. The aqueduct was finally completed and opened to the public in 2003. 5.39.217.76 X- J6 {1 _9 D: x
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