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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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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!

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3 ]- w1 i- x$ `1 U公仔箱論壇Magdeburg Water Bridge in Germany  
What a feat! Six years, 500 million euros, 918 meters long. Now this is engineering! 5.39.217.76) X7 X7 b& w& R  l8 b
This is a channel-bridge over the River Elbe and joins the former East and West Germany as part of the unification project. 公仔箱論壇- ]* }6 i/ |8 ^; W+ Q
It is located in the city of Magdeburg, near Berlin.
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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$ K5 w0 Q4 _( S5 O
The photo was taken on the day of inauguration.tvb now,tvbnow,bttvb2 J! }& Y0 b/ D% V& N
To those who appreciate engineering projects, here's a puzzle for you armchair engineers and physicists.公仔箱論壇* P$ M& U# c+ Y! ~: V1 Y& Y

1 M- S2 L: H8 i  ]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- c* f% w5 R  j7 b
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。  H+ t1 G2 ^, d8 }+ _" Y  P

! X" E% y! D% t6 l. k+ s9 bAnswer:
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It only needs to be designed to withstand the weight of  the water!
! u1 Z7 V4 f# P. [8 F) T, |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
6 |, t) R/ e7 A: M) uThe 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.公仔箱論壇6 |  l. W4 w- o* v1 @2 Z4 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. ' T& ~9 b9 `) G$ O0 Z/ w

; c, G% K% p% @5 stvb 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$ S# u+ r* s. _" I2 s
連通兩條水道的最初構思,而羅騰湖 Rothensee 升船機及大橋錨碇
/ U" r( w1 o" r# \% W0 g也於 1938 年安裝就位,但在二次大戰期間,建設工程被推遲。
5 @- S& \9 A' h# q9 G9 e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。
" ^+ i) K/ R% P, b7 t5.39.217.76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/ o6 a, b& J, j! {9 [% ~
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 萬3 W' e  Z* i6 a' z0 t, l, N/ Y( 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。 1 k3 t" H/ F, B7 L
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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