新胡佛水庫 懸張橋 (Hoover Dam Bypass)
‧本文由 asd 分享 ‧
2009-12-13 ‧
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相信去 Las Vegas 的人一定去過胡佛水庫
懸張橋的好處是沒有橋墩但是建造的成本較高
可以減少水庫上方的重量和壓力以免水庫崩塌
如果台灣的橋樑改成懸張橋比較不怕雨水的沖刷就不會一個颱風斷很多橋了
THE WIDER VIEW:
Taking shape, the new bridge at the Hoover Dam
Creeping closer inch by inch, 900 feet above the mighty Colorado River, the two side of a $160 million bridge at the Hoover Dam slowly takes shape.
The bridge will carry a new section of US Route 93 past the bottleneck of the old road which can be twisting and winding around and across the dam itself.
When complete, it will provide a new link between the states of Nevada and Arizona.
In an incredible feat of engineering, the road will be supported on the two massive concrete arches which jut out of the rock face.
The arches are made up of 53 individual sections each 24 feet long which have been ast on-site and are being lifted into place using an improvised high-wire crane strung between temporary steel pylons.
The arches will eventually measure more than 1,000 feet across. At the moment, the structure looks
like a traditional suspension bridge. But once the arches are complete, the suspending cables on each side
will be removed. Extra vertical columns will then be installed on the arches to carry the road.
The bridge has become known as the Hoover Dam bypass, although it is officially called the
Mike O'Callaghan-Pat Tillman Memorial Bridge, after a former governor of Nevada and an American Football
player from Arizona who joined the US Army and was killed in Afghanistan.. Work on the bridge started in 2005
and should finish next year. An estimated 17,000 cars and trucks will cross it every day.
The dam was started in 1931 and used enough concrete to build a road from New York to San Francisco .
The stretch of water it created, Lake Mead , is 110 miles long and took six years to fill.
The original road was opened at the same time as the famous dam in 1936.
An extra note: The top of the white band of rock in Lake Mead is the old waterline prior to the drought
and development in the Las Vegas area. It is over 100 feet above the current water level.
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古葉
 於 2009-12-13 09:20:05 說各地地形不同，在此處看似不錯的橋，移到它處或許會有浪費公帑的評聲。但臺灣颱風一來橋樑斷裂是不爭的事實，但願政府能徹底解決這個問題，不要來一個颱風修一次橋草草解決。 |
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kuni
於 2009-12-13 12:41:50 說 環境與地形不同,移到台灣不見得適用,基本上不論任何形式的橋,都需要穩定的地質,如果本身地質不穩,容易鬆動,那麼再好的設計都沒用,而環境的自然頻率也會影響橋的穩定性,最著名的例子就是美國華盛頓州一條懸索橋~塔科馬海峽吊橋（Tacoma Narrows Bridge）,其橋樑的自然頻率與強迫共振的頻率相同,造成橋面斷裂,因此在甲地也許是優良的設計橋樑,移到乙地,也許就成了致命的設計了~~ |
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心境
於 2009-12-13 17:07:31 說 或者換一個角度想，每年不斷橋，那土木工程要吃什麼，哈哈，說遠了。 每一種橋梁的設計都有其適用性，其成本也不同，如果知道現行的招標思維，就會了解，為什麼不將事做正確，而是只將事做好。 工程的事，是要在工程上解決，但決策的事，是要在桌面上處理。 |
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happydog= 遠離顛倒夢想 =
 於 2009-12-13 22:43:38 說這應該是未完工的橋。完成後會變成啥樣子？不知道。 |
