EVER SEEN A RIVER OVER A RIVER?
本帖最後由 lilitan008 於 2011-10-3 12:57 PM 編輯 , [4 U1 O1 u5 ~: m( u
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If you are not a Physics person, read on and learn a fact of physics. 公仔箱論壇( e9 H) Z. v; u; L
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Even after you see it, it is still hard to believe!; f, e, G v6 b; v2 r5 t# g# R0 F
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Magdeburg Water Bridge in Germany What a feat! Six years, 500 million euros, 918 meters long. Now this is engineering!
$ w1 p( I" E0 H1 k2 `, {This is a channel-bridge over the River Elbe and joins the former East and West Germany as part of the unification project.
+ U+ m. H: @7 S) `; `5 R. ?5.39.217.76It is located in the city of Magdeburg, near Berlin.公仔箱論壇( \2 G: `6 I' G# p
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The photo was taken on the day of inauguration.公仔箱論壇1 D8 K5 L m4 l- @% e6 ]
To those who appreciate engineering projects, here's a puzzle for you armchair engineers and physicists.TVBNOW 含有熱門話題,最新最快電視,軟體,遊戲,電影,動漫及日常生活及興趣交流等資訊。7 v" D& r1 m) v' L" J0 \+ v" P
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Question:6 r, Y$ i! |' W% }. {1 y
- s' z1 u1 G% @* b6 A! s# cDid that bridge have to be designed to withstand the additional weight of ship and barge traffic,
1 q( Q% h& n( d# K" q1 ~公仔箱論壇Or just the weight of the water? 5.39.217.76: _* h6 R( ~( |/ O* d
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It only needs to be designed to withstand the weight of the water! " y" J; x" `; x. Q! t# d$ j4 b
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公仔箱論壇# ]$ K# O" ?2 v. d3 \( Z
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The Incredible Magdeburg Water Bridge in Germany5.39.217.76/ W$ g9 P/ b f3 d; f8 K; g7 d
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.
4 M8 N4 U8 K. mThe 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. 公仔箱論壇5 S) N& n+ H. b& W
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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.
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