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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Magdeburg Water Bridge in Germany What a feat! Six years, 500 million euros, 918 meters long. Now this is engineering! 5.39.217.76. \/ Q2 J. ]3 o
This is a channel-bridge over the River Elbe and joins the former East and West Germany as part of the unification project.
4 T7 R6 G* _: c) G0 d% C7 i5.39.217.76It is located in the city of Magdeburg, near Berlin.; J* J2 [9 ?6 @0 M* F
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The photo was taken on the day of inauguration.
: v- d, Y2 M) A3 J% p, W1 ]5.39.217.76To those who appreciate engineering projects, here's a puzzle for you armchair engineers and physicists.
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! ~3 k' m: @3 V2 U1 Q/ p% K; D7 btvb now,tvbnow,bttvbQuestion:/ O5 @% [2 b( c& w, W2 F
# I: z0 [8 N0 f2 U1 Utvb now,tvbnow,bttvbDid that bridge have to be designed to withstand the additional weight of ship and barge traffic,5.39.217.76/ N! S" J2 }: L
Or just the weight of the water? 公仔箱論壇) p9 h) I* a4 E5 x/ Y
, ]; f) m+ ^1 X, {Answer:% E; g g9 k6 |( L, q" b% M
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It only needs to be designed to withstand the weight of the water!
7 Y/ [" `2 b- }# U# wWhy? 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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: ^2 P# |# }. [4 B7 ptvb now,tvbnow,bttvbThe Incredible Magdeburg Water Bridge in Germany
! J! F/ P8 D/ H6 KThe 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.' P8 T9 O: p2 m+ ~4 i
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. 5.39.217.769 i o/ i; B/ C7 K; M* R7 O6 Q
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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.
5 V) @) H9 P/ m# E: D4 Z- B公仔箱論壇5 V4 a& q# A' c) e& j
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0 w( o8 f3 \+ ~, v1 Z: m3 r5.39.217.76
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