Difference between revisions of "Shintotakachiho Bridge"

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A rare polygonal arch bridge, the Shintotakachiho became the 8th bridge to tower more than 328 feet (100 mtrs) high within Japan’s Takachiho Gorge region. The asymmetrical arch has an unusually high rise of about 164 feet (50 mtrs) making for a steep rib section of 58 degrees where it meets the foundation.
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The 3 bridges of concrete and steel in Takachiho Gorge tell a progressive story of Japan's bridge construction history. Kamihashi was the first and lowest crossing and opened in 1947 with a span of just 31 meters. In 1955 the Takachiho Bridge opened almost directly above the Kamihashi arch but with steel ribs that soar approximately 60 meters above the Gokase River. In 2003 the polygonal Shintotakachiho was completed with a deck 115 meters high.
 
 
The arch was built outward at the same time as the road deck, eliminating the need for a highline.  To prevent the two halves of the arch from falling into the gorge, several cables were attached from the road deck down to the arch within each spandrel panel.  The next vertical spandrel support was then built up to deck level and connected to another short span of roadway.  The arch rib was built out a little further and the process repeated itself.  Once the two sides of the arch were closed in the middle, the temporary cable stays were all removed from inside the spandrel panels.
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The Shintotakachiho Bridge arch was built outward at the same time as the road deck, eliminating the need for a highline.  To prevent the two halves of the arch from falling into the gorge, several cables were attached from the road deck down to the arch within each spandrel panel.  The next vertical spandrel support was then built up to deck level and connected to another short span of roadway.  The arch rib was built out a little further and the process repeated itself.  Once the two sides of the arch were closed in the middle, the temporary cable stays were all removed from inside the spandrel panels.
 
 
The Shintotakachiho bridge overlooks two other arch bridges including a steel span some 246 feet (75 mtrs) high and a stone span around 100 feet (30 mtrs) high.  Takachiho Gorge has become a region with more high bridges than any other single location in Japan.  These include the Takachiho Railway bridge, the Tensho and Aoba concrete arches, the Ryuten, Unkai and Seiun steel arches and the Kamiiwato concrete beam bridge. All 8 bridges are more than 328 feet (100 mtrs) in height. If you have just one day to visit high bridges in Japan, Takachiho gorge is the place to be!
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There is no other region in Japan that has as many high bridges than the Takachiho Gorge Scenic Area of Miyazaki Prefecture. Within a distance of just 30 kilometers the Gokase and Iwato River canyons are crossed by no less than 15 high bridges.
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Several of these spectacular crossings were the highest in Japan including Tensho, Seiun and Unkai Bridges. The Takachiho Railway Bridge is still the highest railway crossing in Japan even if it not longer operates with regular trains. The asymmetrical arch has an unusually high rise of about 164 feet (50 mtrs) making for a steep rib section of 58 degrees where it meets the foundation.
  
  

Revision as of 05:14, 7 July 2020

Shintotakachiho Bridge
神都高千穂大橋
Takachiho, Miyazaki, Japan
377 feet high / 115 meters high
469 foot span / 143 meter span
2003

1TakachihoArchBridge.jpg


The 3 bridges of concrete and steel in Takachiho Gorge tell a progressive story of Japan's bridge construction history. Kamihashi was the first and lowest crossing and opened in 1947 with a span of just 31 meters. In 1955 the Takachiho Bridge opened almost directly above the Kamihashi arch but with steel ribs that soar approximately 60 meters above the Gokase River. In 2003 the polygonal Shintotakachiho was completed with a deck 115 meters high.

The Shintotakachiho Bridge arch was built outward at the same time as the road deck, eliminating the need for a highline. To prevent the two halves of the arch from falling into the gorge, several cables were attached from the road deck down to the arch within each spandrel panel. The next vertical spandrel support was then built up to deck level and connected to another short span of roadway. The arch rib was built out a little further and the process repeated itself. Once the two sides of the arch were closed in the middle, the temporary cable stays were all removed from inside the spandrel panels.

There is no other region in Japan that has as many high bridges than the Takachiho Gorge Scenic Area of Miyazaki Prefecture. Within a distance of just 30 kilometers the Gokase and Iwato River canyons are crossed by no less than 15 high bridges.

Several of these spectacular crossings were the highest in Japan including Tensho, Seiun and Unkai Bridges. The Takachiho Railway Bridge is still the highest railway crossing in Japan even if it not longer operates with regular trains. The asymmetrical arch has an unusually high rise of about 164 feet (50 mtrs) making for a steep rib section of 58 degrees where it meets the foundation.


まれに見る、多角辺形アーチ橋の神都高千穂大橋は、高千穂峡谷地域内で、タワーが100m以上の橋の中で八番目となりました。 非対称的なこのアーチには、ほぼ50mのめずらしく高いアーチライズがあり、基礎部分と結合しているところでは58度の急勾配リブセクションを形成しています。

路面デッキと同時にアーチは外側に向けて造られたため、ハイライン(高架線)を使う必要性を排除しました。二つに分かれているアーチが峡谷に落下するのを防ぐために、それぞれのスパンドレルパネル内部を通し7~8本のケーブルは路面デッキより下のアーチにつながれています。そして、次の垂直補強スパンドレルパネルはデッキの位置まで造られ、別の短いスパンの路面につなげられます。 アーチリブはもう少し外側に向けて造られ、この工程は繰り返されます。二つに分かれているアーチが中央で結合されると、一時的に使われたケーブル支柱は全てスパンドレルパネルより外されます。

神都高千穂大橋は他の二つ橋、75mほど高いスチールスパンの橋と約30mの高さのストーンスパンの橋、を見下ろします。高千穂峡谷は日本のどの一地域よりも高い橋が集まってる地域となりました。それらは、高千穂橋、コンクリート橋である天翔大橋と青葉大橋、鋼アーチ橋の龍天橋と雲海橋そして青雲橋、コンクリートビーム橋の上岩戸大橋です。この八つの橋全てが100m以上の高さを誇ります。もし、あなたが一日だけで高い橋をたくさん見たいのであれば、高千穂峡谷地域がお勧めの場所です!


2ShintotakachihoBridge.jpg

Image by Japanese Society of Civil Engineers.


3TakachihoGorgeArch.jpg


TakachihoSatellite.jpg

Shintotakachiho Bridge satellite image.


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Shintotakachiho Bridge location map.


MiyasakiBridgesMap.jpg


TakachihoMap.png


Takachihomap.jpg