The tower is the primary television and radio broadcast site for the Kantō region; the older Tokyo Tower no longer gives complete digital terrestrial television broadcasting coverage because it is surrounded by high-rise buildings. Skytree was completed on Leap Day, 29 February 2012, with the tower opening to the public on 22 May 2012.[5] The tower is the centrepiece of a large commercial development funded by Tobu Railway (which owns the complex) and a group of six terrestrial broadcasters headed by NHK. Trains stop at the adjacent Tokyo Skytree Station and nearby Oshiage Station. The complex is Template:Convert northeast of Tokyo Station. Sumida Aquarium is in the Tokyo Solamachi complex.
Contribution to disaster prevention – "Safety and Security"
The base of the tower has a structure similar to a tripod; from a height of about Template:Cvt and above, the tower's structure is cylindrical to offer panoramic views of the river and the city.[9] There are observatories at Template:Cvt, with a capacity of up to 2,000 people, and Template:Cvt, with a capacity of 900 people.[10] The upper observatory features a spiral, glass-covered skywalk in which visitors ascend the last 5 metres to the highest point at the upper platform. A section of glass flooring gives visitors a direct downward view of the streets below.[11]
Earthquake resistance
The tower has seismic proofing, including a central shaft made of reinforced concrete. The main internal pillar is attached to the outer tower structure for the first 125 metres above ground. From there until 375 metres the pillar is attached to the tower frame with oil dampers, which act as cushions during an earthquake. Additional resilience is achieved through an "added mass control mechanism" (or tuned mass damper) – a damping system which, in the event of an earthquake, moves out of step with the building's structure, to keep the centre of gravity as central as possible to the tower's base.[12] According to the designers, the dampers can absorb 50 percent of the energy from an earthquake.[13][14]
The exterior lattice is painted a colour officially called "Skytree White". This is an original colour based on a bluish-white traditional Japanese colour called Script error: No such module "Nihongo"..[15]
Illumination
The illumination design was published on 16 October 2009. Two illumination patterns alternate daily. One is the sky blue Iki (chic, stylish), and the other is the purple Miyabi (elegance, refinement). The tower is illuminated using LEDs.[16]
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: Script error: No such module "Nihongo"., Script error: No such module "Nihongo"., Script error: No such module "Nihongo"., Script error: No such module "Nihongo"., Script error: No such module "Nihongo"., Script error: No such module "Nihongo".. The official name was decided in a nationwide vote, and was announced on 10 June 2008 as "Tokyo Skytree". The name received around 33,000 votes (30%) out of 110,000 cast, with the second most popular name being "Tokyo Edo Tower".[17]
The height of Template:Cvt was selected to be easily remembered. The figures 6 (mu), 3 (sa), 4 (shi) stand for "Musashi", an old name for the region where the Tokyo Skytree stands.[18]
Broadcasting use
Tokyo Skytree is used as a radio/television broadcast and communications tower.
6 April 2009: The foundations for the three main legs were completed.[20]
7 August 2009: The tower reached a height of 100 m.[21]
16 October 2009: The projected height was increased from 610 m to 634 m to make it the highest self-supportingTemplate:Elucidate steel tower. Also, 6-3-4 is Mu-sa-shi in Japanese wordplaygoroawase.[22]
10 November 2009: The tower reached a height of 200 m.[23]
2010
16 February 2010: The tower reached a height of Template:Cvt.[24]
29 March 2010: The tower reached a height of Template:Cvt, becoming the tallest structure in Japan.[1]
30 July 2010: The tower topped 400 m, reaching a height of Template:Cvt.[26]
11 September 2010: The tower reached 461 m, becoming the tallest structure ever built in Japan, surpassing the dismantled Tsushima Omega tower of 455 m.Script error: No such module "Unsubst".
23 October 2010: The tower reached a height of Template:Cvt, and assembly of the main tower section was completed.
20 November 2010: Two tuned mass dampers with a total weight of 100 tons were temporarily placed on the tower tip at 497 m.[27][28]
1 December 2010: The tower topped the Template:Cvt mark and reached a height of Template:Cvt, beating Taipei 101 (Template:Cvt). A lightning conductor and two tuned mass dampers were docked to the gain tower, which was gradually lifted within the central shaft.[29]
17 November 2011: Guinness World Records certified the Tokyo Skytree as the tallest free-standing tower.[36]
2012
16 February 2012: The roofs of warehouses close to the tower were damaged by falling snow and ice from the tower.[37][38]
29 February 2012: Tower construction was finished. Completion was delayed two months from the original schedule because of a shortage of supplies due to the effects of the 2011 Japanese earthquake and tsunami.[39]Script error: No such module "Unsubst".
2 March 2012: A ceremony was held to celebrate the completion with a kannushi priest and 70 people from Tobu Group, construction, broadcasting and other companies.[40][41]
6 March 2012: First Light-up during the Tokyo Hotaru Festival
1 October 2012: Channel 9 Tokyo MX start transmission from Tokyo Skytree with continuing transmission from Tokyo Tower in simulcast manner.[43]
2013
16 January 2013: Snow falling from the tower knocked a hole in the roof of a nearby house. No one was reported injured.[44]
13 May 2013: Tokyo MX continued transmission from Tokyo Skytree and stopped transmission from Tokyo Tower with a gradual decrease in power since 12 November 2012.[45]
31 May 2013: On 9:00 a.m., formal transmission of broadcast in channel 1 to 8, except 3, start from Tokyo Skytree after number of test transmission with off for minutes to hours from Tokyo Tower since 22 December 2012.
2022
22 May 2022: the 10th anniversary of the opening of Tokyo Skytree was celebrated with Kabuki by Ichikawa Ebizo XI who performed a signature technique called the "nirami" glare on a special stage atop of the tower.[46]
Opening
As the Skytree's opening approached, people reportedly waited in line for a week to get tickets. By the opening, trips up the tower were fully booked for the first two months of operation.[47] The opening day drew a crowd of tens of thousands, despite rainy conditions which blocked the view from the tower's observation deck. Strong winds also forced two elevators to be shut down, leaving some visitors briefly stranded on the observation deck.[48]
According to Tobu, 1.6 million people visited Skytree in its first week. Local residents reported that the influx of visitors disturbed the peace of their community and had, so far, generated little economic benefit for the local area.[49]
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