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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 5.39.217.76/ N& {0 \, Y4 d1 C
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If you are not a Physics person, read on and learn a fact of physics.   
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( K  m5 Q) W8 n2 [# r5.39.217.76Even 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!
* d3 \: b- ~1 yTVBNOW 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。This is a channel-bridge over the River Elbe and joins the former East and West Germany as part of the unification project.
, `" q* f# X" F4 O4 o/ m5 O5.39.217.76It is located in the city of Magdeburg, near Berlin.

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& T2 @# n. C5 qTVBNOW 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。The photo was taken on the day of inauguration.
8 s8 f; C" R* K9 C0 I3 c, `1 f; Z6 E公仔箱論壇To those who appreciate engineering projects, here's a puzzle for you armchair engineers and physicists.
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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,
. h7 n9 k+ Y- I) p/ a5 B% sTVBNOW 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。Or just the weight of the water?
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Answer:

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It only needs to be designed to withstand the weight of  the water!
. i- R! i4 J/ o! g7 X1 b+ n5.39.217.76Why? A ship always displaces an amount of water that weighs the same as the ship, regardless of how heavily a ship may be loaded

2 \; v/ |- m: r& `% yTVBNOW 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。
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The Incredible Magdeburg Water Bridge in Germany
2 @* M6 e+ Z2 p1 o6 @* n( ]5.39.217.76The 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.: J# a% X4 A$ b
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. ' n$ @( a% ]8 B# \5 N. ^/ R; r
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。. ~- p, u7 p& ?, V, K
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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: ]7 w* [9 [2 S1 U" i6 HTVBNOW 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。tvb now,tvbnow,bttvb/ E; V' ~* m+ a6 ^$ {
tvb now,tvbnow,bttvb# T: O. ?+ `& U0 ?7 P( \! H( j
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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9 g/ q( s" k& L+ I' I1 q# F( }
連通兩條水道的最初構思,而羅騰湖 Rothensee 升船機及大橋錨碇/ c& j$ k& C& [
也於 1938 年安裝就位,但在二次大戰期間,建設工程被推遲。
* U, i; L$ b! Z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。
+ J- N) U; j& G3 o7 T( PTVBNOW 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。
& W& Q* {" T; g6 y: f: H4 sTVBNOW 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。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
, v4 Z5 M6 F. A3 ~! A8 q) E5.39.217.76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。
: N( y9 }: k+ z/ e9 W1 f& xtvb now,tvbnow,bttvb2003 年正式通航,水橋全長 918 公尺。 而 2003 年之前,在米德蘭運河和公仔箱論壇8 N3 ?5 z* G& w5 G7 b
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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