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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 tvb now,tvbnow,bttvb4 U: c3 E/ R; M/ P7 Q
公仔箱論壇5 J8 X3 ]5 r5 j) s
If you are not a Physics person, read on and learn a fact of physics.   
+ W/ z- Z" i9 ^: [公仔箱論壇AMAZING!

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  j9 R9 |* R& T# J- C0 YEven 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!
. y% L8 B4 @# v0 [This is a channel-bridge over the River Elbe and joins the former East and West Germany as part of the unification project. tvb now,tvbnow,bttvb" \, s1 e7 x* Y2 R' v2 B
It is located in the city of Magdeburg, near Berlin.

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* H! f) j* |& x1 A  T) AThe photo was taken on the day of inauguration.5.39.217.76* p, B# g! N) n
To those who appreciate engineering projects, here's a puzzle for you armchair engineers and physicists.8 {5 i/ H" }% p! a" P; j) @+ _
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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,5.39.217.76( y% |9 k2 |5 ]# X
Or just the weight of the water? 公仔箱論壇3 f4 S: S3 [6 s5 J, U

6 ~5 P/ i/ g+ r, p7 mAnswer:

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It only needs to be designed to withstand the weight of  the water! 公仔箱論壇) o& y/ @$ U! Z* y
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
) [/ F) F$ ?8 ztvb now,tvbnow,bttvbThe 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.5.39.217.761 [" d5 D; ]0 G8 B! l3 d1 l7 A* S
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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5 {5 }* e) U  `; @tvb now,tvbnow,bttvbConstruction 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
6 x! R5 @7 l# v. R0 ]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$ ?$ I/ M& W+ h+ ?) ~! i
也於 1938 年安裝就位,但在二次大戰期間,建設工程被推遲。
, k. M  @5 j3 r6 v3 j: Y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。
, l: x8 x& h) z& x% f1 i; p) aTVBNOW 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。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/ A/ c# w  P1 d1 H# t+ F
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
$ X% W# g$ ]6 R  l# C/ t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 k) [* {5 z# t0 Y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
* I8 l7 A) |2 w4 t  s) G& @5.39.217.76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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多谢您的分享!
first time heard & saw it, thanks for sharing, thanks tvboxnow!!
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