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EVER SEEN A RIVER OVER A RIVER?

本帖最後由 lilitan008 於 2011-10-3 12:57 PM 編輯
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! ^9 Z. k" w. t4 K公仔箱論壇If you are not a Physics person, read on and learn a fact of physics.   
1 l. j4 e6 i0 ]6 ?* i- f4 P6 _tvb now,tvbnow,bttvbAMAZING!
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Even after you see it, it is still hard to believe!

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Magdeburg Water Bridge in Germany  
What a feat! Six years, 500 million euros, 918 meters long. Now this is engineering!
: m7 |2 x% h1 F9 n4 ?& b" IThis is a channel-bridge over the River Elbe and joins the former East and West Germany as part of the unification project. 9 g0 V. H8 P9 g# k$ C+ D% C" y
It is located in the city of Magdeburg, near Berlin.
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  i8 D8 I3 U% C+ H1 x( btvb now,tvbnow,bttvbThe photo was taken on the day of inauguration.5.39.217.77:8898% A' E  ]/ X" s. S+ m; O! S
To those who appreciate engineering projects, here's a puzzle for you armchair engineers and physicists.公仔箱論壇$ H9 E: O" e1 v1 ]) O7 \" s

& r, n. x# ^7 @. k* J公仔箱論壇Question:
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Did that bridge have to be designed to withstand the additional weight of ship and barge traffic,! O: b5 E: T1 u4 O; T7 _
Or just the weight of the water? 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。4 `+ V& b2 q6 J' n! ~* A9 v
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Answer:
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It only needs to be designed to withstand the weight of  the water! 7 I. W- g! l! E- s
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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The Incredible Magdeburg Water Bridge in Germany
3 O. W$ z! l0 F  v  L: q. z4 i1 ~: A1 Y5.39.217.77:8898The 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.
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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. ( {* m7 M/ r7 c* T

" k. T) }9 x9 [1 I& g' ?5.39.217.77:8898Construction 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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平壤核子能源研究所
這宏偉壯觀、傲視寰宇的工程傑作早在 1919 年工程師們即已提出
* b# p$ C0 n/ q. N+ M& B  `' J5 E2 qtvb now,tvbnow,bttvb連通兩條水道的最初構思,而羅騰湖 Rothensee 升船機及大橋錨碇, n- ^) P& K7 W/ V
也於 1938 年安裝就位,但在二次大戰期間,建設工程被推遲。
1 j% [( V  H1 v  \3 Q9 X隨後的冷戰時期,德國分裂,該專案被東德政府無限期地擱置下來。% X& Z8 z: z- }, X: c
德國重新統一後,隨著道路交通重大工程規劃的編制,水橋再次成為一個優先專案。0 o- t/ m5 j! i3 S% b+ Z3 I
於1997年開始建造,經過 6 年,耗資 5 億歐元,2.4 萬噸鋼材和 6.8 萬
# @5 P4 o& Y+ n* F% F) o立方公尺混凝土,完成了巨大的水橋,連接柏林的內陸港與萊茵河沿岸港口。
; J$ Y: |/ E" F2 {2 d8 ?公仔箱論壇2003 年正式通航,水橋全長 918 公尺。 而 2003 年之前,在米德蘭運河和
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多谢您的分享!
first time heard & saw it, thanks for sharing, thanks tvboxnow!!
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