本帖最後由 lilitan008 於 2011-10-3 12:57 PM 編輯 5.39.217.763 M5 N$ x2 q" d% V
# t# Z! J* d5 C* ?: W. Ztvb now,tvbnow,bttvbIf you are not a Physics person, read on and learn a fact of physics. K& P) _: S6 [
AMAZING!
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5 A8 x: G4 M0 M6 z' w0 |/ stvb now,tvbnow,bttvbEven after you see it, it is still hard to believe!
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1 J& i6 D' F# g公仔箱論壇Magdeburg Water Bridge in Germany What a feat! Six years, 500 million euros, 918 meters long. Now this is engineering!
6 {% `" G- i4 `3 ?' n0 X5.39.217.76This 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" c: c3 R# N' F
It is located in the city of Magdeburg, near Berlin.
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The photo was taken on the day of inauguration.
* ^! g0 m7 ]" `3 ~4 i7 C7 y9 P4 q; K5.39.217.76To those who appreciate engineering projects, here's a puzzle for you armchair engineers and physicists.公仔箱論壇; T2 A( ]2 a1 i2 n9 u
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Question:
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Did that bridge have to be designed to withstand the additional weight of ship and barge traffic,公仔箱論壇& v+ L/ Y# F4 K* x) S" H
Or just the weight of the water? ( b2 M$ o, F) D- e0 @- t
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Answer:
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8 d# m, p0 O' T5 z% p4 atvb now,tvbnow,bttvbIt only needs to be designed to withstand the weight of the water! 9 m$ _; w4 N7 Y+ {6 r$ ` g; g
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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1 W7 B5 h* Y8 ?The Incredible Magdeburg Water Bridge in Germany
! K; S2 d( t5 s# C( g7 ]公仔箱論壇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.5 x# u6 q0 P1 j5 Z0 d) P
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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9 F: z) }/ p3 }, [& CConstruction 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. 公仔箱論壇1 q E+ n9 d% M' |% t: b: j
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