Views from the Top of Akashi Kaikyo Bridge 明石海峡大橋の主塔頂上からの風景

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• published: 31 Oct 2010
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7/30/2010 The Akashi-Kaikyō Bridge (明石海峡大橋 Akashi Kaikyō Ō-hashi?), also known as the Pearl Bridge, has the longest central span of any suspension bridge, at 1,991 metres (6,532 ft). It is located in Japan and was completed in 1998[1]. The bridge links the city of Kobe on the mainland of Honshū to Iwaya on Awaji Island by crossing the busy Akashi Strait. It carries part of the Honshū-Shikoku Highway. The bridge is one of the key links of the Honshū-Shikoku Bridge Project, which created three routes across the Inland Sea. The bridge has three spans. The central span is 1,991 m (6,532 ft)[1], and the two other sections are each 960 m (3,150 ft). The bridge is 3,911 m (12,831 ft) long overall. The central span was originally only 1,990 m (6,529 ft), but the Kobe earthquake on January 17, 1995, moved the two towers sufficiently (only the towers had been erected at the time) so that it had to be increased by 1 m (3.3 ft).[1] The bridge was designed with a two-hinged stiffening girder system, allowing the structure to withstand winds of 286 kilometres per hour (178 mph), earthquakes measuring to 8.5 on the Richter scale, and harsh sea currents. The bridge also contains pendulums that are designed to operate at the resonance frequency of the bridge to damp forces. The two main supporting towers rise 298 m (978 ft) above sea level, and the bridge can expand because of heating up to 2 metres (7 ft) over the course of a day. Each anchorage required 350,000 tonnes (340,000 LT; 390,000 ST) of concrete. The steel cables have 300,000 kilometres (190,000 mi) of wire: each cable is 112 centimetres (44 in) in diameter and contains 36,830 strands of wire. http://en.wikipedia.org/wiki/Akashi_Kaiky%C5%8D_Bridge 舞子側より（2001年8月28日撮影） 明石海峡大橋（あかしかいきょうおおはし）は、兵庫県神戸市垂水区東舞子町と淡路市岩屋とを結ぶ、明石海峡を横断して架けられた世界最長の吊り橋である。 神戸側の橋桁内に舞子海上プロムナードという遊歩道、展望台が設けられている。橋台（アンカーレイジ）内のエレベータで、上り海面からの高さ47mへ上がり、そこから海側約150mまで行くことができる。途中、床が透明になっている部分もあり、直接海面を望むことができる。 同じく神戸側の陸上に橋の科学館が開設されており、明石海峡大橋を中心に橋についての技術的、歴史的展示を行なっている。頭上には風洞実験に用いた1/100サイズの模型も展示されている。また、土産として、ケーブルの素線の実物サンプルが販売されている。また、一般では通常入れない管理通路や主塔の頂上に登る、ブリッジワールドという行事も予約制（期間・人数限定）で行なわれている。 http://ja.wikipedia.org/wiki/%E6%98%8E%E7%9F%B3%E6%B5%B7%E5%B3%A1%E5%A4%A7%E6%A9%8B http://www.jb-honshi.co.jp/bridgeworld/index.html