本帖最後由 lilitan008 於 2011-10-3 12:57 PM 編輯 5.39.217.76( J9 |- e" w7 |
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If you are not a Physics person, read on and learn a fact of physics.
4 V2 n& L- E# w3 X8 o [% S4 E& zAMAZING!
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8 c$ p5 m5 { Z$ z+ j: SEven after you see it, it is still hard to believe!
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2 p' z2 i1 t6 Y/ M) l6 o5.39.217.76Magdeburg Water Bridge in Germany What a feat! Six years, 500 million euros, 918 meters long. Now this is engineering!
4 l0 e, P' U6 G/ f4 A$ a9 q. d5 D! T公仔箱論壇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! O/ R& V/ [( x9 h" c
It is located in the city of Magdeburg, near Berlin.公仔箱論壇- J% i1 }& Q+ l& \- O0 _
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The photo was taken on the day of inauguration.tvb now,tvbnow,bttvb# v% T5 [; z# d! @5 [" \
To those who appreciate engineering projects, here's a puzzle for you armchair engineers and physicists., S+ P% |4 f, {' h1 r7 n+ _8 @
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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,+ C" c! s. Y P$ {2 {
Or just the weight of the water?
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; j! Q( z9 O. k( U yAnswer:
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& I4 ^" i8 Q2 U# v; Q" l! t. I: h' yIt only needs to be designed to withstand the weight of the water! 5.39.217.76& w2 E s5 M9 @; J( F' o" n' R
Why? A ship always displaces an amount of water that weighs the same as the ship, regardless of how heavily a ship may be loaded5.39.217.76 n- w9 r3 r3 X g
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The Incredible Magdeburg Water Bridge in Germany
$ j, z% b j3 m' |! H* \tvb 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.公仔箱論壇 N# ~/ J% r' Z2 B$ T
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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G5 ~5 q8 G$ f3 x公仔箱論壇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. 5.39.217.76$ h0 ], G |7 t9 _: J" h
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