Tokyo Sky Tree, formerly known as New Tokyo Tower, is a broadcasting, restaurant, and observation tower in Sumida, Tokyo, Japan. It became the tallest structure in Japan in 2010 and reached its full height of 634.0 metres (2,080 ft) in March 2011, making it the tallest tower in the world, displacing the Canton Tower, and the second tallest structure in the world after Burj Khalifa (829.84 m/2,723 ft).
Led by Tobu Railway and a group of six terrestrial broadcasters headed by NHK, the tower project forms the centrepiece of a large commercial development equidistant from Tokyo Skytree and Oshiage train stations, 7 km (4.3 mi) north-east of Tokyo station. One of its main purposes is to relay television and radio broadcast signals; Tokyo’s current facility, Tokyo Tower with a height of 333 m (1,093 ft), no longer gives complete digital terrestrial television broadcasting coverage because it is surrounded by many high-rise buildings. The project was completed on 29 February 2012, with the tower’s public opening due on 22 May 2012.
The design was published on 24 November 2006, based on the following three concepts. – Fusion of futuristic design and traditional beauty of Japan, – Catalyst for revitalization of the city, – Contribution to disaster prevention “Safety and Security”.The base of the tower has a structure similar to a tripod; from a height of about 350 m (1,150 ft) and above, the tower’s structure is cylindrical to withstand very strong winds.There are observatories at 350 m (1,150 ft) and 450 m (1,480 ft).
The tower has seismic proofing, including a central shaft made of reinforced concrete. The main internal pillar is attached to the outer tower structure 125 meters (410 ft) above ground. From there until 375 meters (1,230 ft) the pillar is attached to the tower frame with oil dampers, which act as cushions during an earthquake. According to the designers, the dampers can absorb 50 percent of the energy from an earthquake.From October to November 2007, suggestions were collected from the general public for the name to be given to the tower. On 19 March 2008, a committee chose six final candidate names: Tokyo Edo Tower, Tokyo Sky Tree, Mirai Tree, Yumemi Yagura, Rising East Tower, and Rising Tower, with the official name to be decided in a nationwide vote. On 10 June 2008, the official name of the tower was announced as “Tokyo Sky Tree”. The name received around 33,000 votes (30%) out of 110,000 cast, with the second most popular name being “Tokyo Edo Tower”.
The height of 634 m (2,080 ft) was selected to be easily remembered. The figures 6 (mu), 3 (sa), 4 (shi) stand for “Musashi” an old name of the region where the Tokyo Sky Tree stands.