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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 0 U+ G& a* H0 q; e% i- v- a
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If you are not a Physics person, read on and learn a fact of physics.   
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Even after you see it, it is still hard to believe!
公仔箱論壇- j3 F0 j4 I" E; u; D! Q% r" E5 i+ v

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% P' I2 B! }" {+ s2 q: {3 oMagdeburg Water Bridge in Germany  
What a feat! Six years, 500 million euros, 918 meters long. Now this is engineering!
1 w* r& K  x7 @& H# @) XThis is a channel-bridge over the River Elbe and joins the former East and West Germany as part of the unification project. 8 `. `0 Z1 ]. G9 s% P  ?" b
It is located in the city of Magdeburg, near Berlin.
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The photo was taken on the day of inauguration.
* |5 E6 b  R4 X; ZTo those who appreciate engineering projects, here's a puzzle for you armchair engineers and physicists.% U+ m4 N3 Q$ Q" Q# D" K
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Question:

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$ N1 @% [7 g' ^6 O公仔箱論壇Did that bridge have to be designed to withstand the additional weight of ship and barge traffic,. T  U, b0 |. _$ d6 M' Y6 j$ ^
Or just the weight of the water? 4 j% f5 k# t* e4 R9 I( r& D2 k
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Answer:

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It only needs to be designed to withstand 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 {5 ~# T2 `* W# J' @
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
( ], v$ D( F# x4 X7 e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.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。: d: H! p, S7 Y! C1 N2 V
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. 5.39.217.76, o9 |/ C* k: M, B1 R( I) y
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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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# k4 u- q, d6 j0 k7 Dtvb now,tvbnow,bttvb
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2 v  Y9 j8 ~2 }4 [. B公仔箱論壇
) Y8 L& o* d! K) B/ [tvb now,tvbnow,bttvb
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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
2 o. ~4 P2 Q  @/ z( o連通兩條水道的最初構思,而羅騰湖 Rothensee 升船機及大橋錨碇公仔箱論壇9 ~. Z+ y0 u/ t9 b5 N/ c
也於 1938 年安裝就位,但在二次大戰期間,建設工程被推遲。
' t/ l/ l" O$ K6 u# D# G5.39.217.76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。
0 ~# q0 R  Q' U1 |7 X$ ~) u  @5.39.217.76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。tvb now,tvbnow,bttvb, D, q- E8 n) `
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! Z8 t; k% [: w: Y# j( K
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。
5 \- h7 O% u" K1 s" n& z5.39.217.762003 年正式通航,水橋全長 918 公尺。 而 2003 年之前,在米德蘭運河和
+ F% w- j8 x5 N. D$ ?% D易北河-哈威爾運河之間運行的船舶不得不繞道 12 公里通過。
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  • k23bb

多谢您的分享!
first time heard & saw it, thanks for sharing, thanks tvboxnow!!
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