Tokyo Sky Tree

Tokyo Sky Tree

Tokyo Sky Tree under construction
634 m October 2011
General information
Status Under construction
Type Broadcast, restaurant, and observation tower
Location Sumida, Tokyo, Japan
Coordinates 35°42′36.5″N 139°48′39″E / 35.710139°N 139.81083°E / 35.710139; 139.81083Coordinates: 35°42′36.5″N 139°48′39″E / 35.710139°N 139.81083°E / 35.710139; 139.81083
Construction started 14 July 2008
Estimated completion February 2012
Opening 22 May 2012
Cost 40 billion JPY (440 million USD)
Antenna spire 634.0 m (2,080 ft)
Roof 495.0 m (1,624 ft)
Top floor 450.0 m (1,476 ft)
Technical details
Elevator count 13
Design and construction
Owner Tobu Tower Sky Tree Co., Ltd.
Main contractor Obayashi Corp.
Architect Nikken Sekkei
Developer Tobu Railway

The Tokyo Sky Tree (東京スカイツリー Tōkyō Sukai Tsurī?), formerly known as New Tokyo Tower (新東京タワー Shin Tōkyō Tawā?), is a broadcasting, restaurant and observation tower under construction in Sumida, Tokyo, Japan. It has been the tallest artificial structure in Japan since 2010.[1] The tower reached its full height of 634.0 metres (2,080 ft) in March 2011 but will not be finished until at least February 2012.

The project is being led by Tobu Railway and a group of six terrestrial broadcasters (headed by public broadcaster NHK). Construction of the tower is scheduled to be completed by February 2012, with the public opening on 22 May 2012.[2] The completed structure will be the centrepiece of a massive commercial development located equidistant from Narihirabashi Station and Oshiage Station.

One of Tokyo Sky Tree's main purposes is as a television and radio broadcasting tower. Tokyo's current broadcasting tower, Tokyo Tower, is at 333 m (1,093 ft), and is no longer tall enough to give complete digital terrestrial television broadcasting coverage because it is surrounded by many high-rise buildings.

The Tokyo Sky Tree is currently the tallest tower in the world. It is taller than Canton Tower (600 m (1,969 ft)); the tallest structure on an island, taller than Taipei 101; and the second tallest structure in the world, after the Burj Khalifa in Dubai.



The cross-section of the tower forms an equilateral triangle on the ground, gradually rounding to become circular at 320 m elevation.

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", but from a height of about 350 m and above, the tower's structure is cylindrical to withstand very strong winds.

The tower also has state-of-the-art seismic proofing, including a central shaft made of reinforced concrete.


The exterior lattice is painted a color officially called "Sky Tree White". This is an original color based on a bluish white Japanese traditional color called aijiro (藍白?).[3]


The illumination design was published on 16 October 2009. Two different illumination patterns (Sky blue and Purple) will be used, alternately daily. The tower will be illuminated using LED lights.

Naming and height

Diagram of the tallest TV-Towers

From 26 October to 25 November 2007, suggestions were collected from the general public for the name to be given to the new 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".[4]

The height of 634 m was selected to have a height that is easy to be remembered. The figures 6 (mu), 3 (sa), 4 (shi) stand for "Musashi" an old name of the region where the Tokyo Sky Tree stands.

Broadcasting use

Tokyo Sky Tree will be used as a communications tower for a number of different media and by numerous companies.

Television broadcasters

Channel Channel name Callsign Signal power Broadcast area
NHK General TV / NHK G (GTV) JOAK-DTV 10 kW Kantō (except Ibaraki Prefecture)
NHK Educational TV / NHK E (ETV) JOAB-DTV All Japan
Nippon Television / Nittele (NTV) JOAX-DTV All Kantō
TV Asahi / Tele-Asa (EX) JOEX-DTV
TV Tokyo / Teleto (TX) JOTX-DTV
Fuji Television (CX) JOCX-DTV
Tokyo Metropolitan Television / Tokyo MX JOMX-DTV 3 kW Tokyo

FM radio broadcasters

Frequency Station name Callsign ERP Broadcast area
81.3 MHz J-WAVE JOAV-FM 44 kW Tokyo
82.5 MHz NHK Tokyo FM JOAK-FM



  • 14 July 2008: A ceremony was held at the site to mark the start of construction.[5]


  • 6 April 2009: The foundations for the three main legs were completed.[6]
  • 7 August 2009: The tower reached a height of 100 m.[7]
  • 16 October 2009: The projected height was increased from 610 m to 634 m to make it the highest self-supporting steel tower. 6-3-4 is Mu-sa-shi in Japanese wordplay goroawase.[8]
  • 10 November 2009: The tower reached a height of 200 m.[9]


  • 16 February 2010: The tower reached a height of 300 m.[10]
  • 29 March 2010: The tower reached a height of 338 m, becoming the tallest structure in Japan.[1]
  • 24 April 2010: A 1:25 scale model of the Tokyo Sky Tree was unveiled at the Tobu World Square theme park in Nikkō, Tochigi.[11]
  • 30 July 2010: The tower topped 400 m, reaching a height of 408 m.[12]
  • 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.[13]
  • 23 October 2010: The tower reached a height of 497 m, 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.[14][15]
  • 1 December 2010: The tower topped the 500 m mark and reached a height of 511 m, beating Taipei 101 (509 m). A lightning conductor and two tuned mass dampers were docked to the gain tower, which was gradually lifted within the central shaft.[16]
  • 16 December 2010: Ministry of Internal Affairs and Communications approved NHK and five TV key stations in Tokyo's plans to install their broadcasting facilities on the tower.[17]
  • 18 December 2010: The transmitting antenna for digital terrestrial television began to be installed.


  • 1 March 2011: The tower topped the 600 m mark and reached a height of 604 m, beating Canton Tower (600 m) and becoming the world's tallest tower.[18][19]
  • 12 March 2011: The tower reached a height of 625 m. A full inspection was made, looking for possible damage by the 2011 Tōhoku earthquake and its aftershocks.
  • 18 March 2011: The tower reached its final height of 634 m at 1:34 p.m. JST.[20]
  • 23 May 2011: Dismantling four tower cranes one by one, continue till mid-July.[21]
  • 7 June 2011: Announced public opening date of Tokyo Sky Tree Town and entrance fee (Adults: 2,000 yen to 350 m level; extra 1,000 yen to 450 m level) to observation floors. [22]

Construction progress

See also




  1. ^ a b Tokyo Sky Tree beats Tokyo Tower, now tallest building in Japan, The Mainichi Daily News, 29 March 2010
  2. ^ "事業概要" (in Japanese). Tokyo Sky Tree Home. Retrieved 2 September 2011. 
  3. ^ "Color Design". Tokyo Sky Tree. Japan: Tobu Railway Co.. 2008. Retrieved 7 June 2011. 
  4. ^ Name of New Tower Decided (Japanese)
  5. ^ Tokyo Sky Tree construction starts. The Japan Times (15 July 2008). Retrieved on 15 July 2008.
  6. ^ "高さ610メートル電波塔「スカイツリー」本体が地上に姿 [The height of 610 meter radio wave tower, "Sky Tree", the main body of tower appeared on the ground]" (in Japanese). Tokyo: Sankei Shimbun. Archived from the original on 2009-04-06. Retrieved 2009-07-28. 
  7. ^ "Tokyo Sky Tree is the height of the body beyond the 100m tower. Tree is growing steadily.". 
  8. ^ "東京スカイーツリーの最高高さを634mに決定しました。 [Maximum height of Tokyo Sky Tree decided to be 634m]" (in Japanese) (PDF). Tokyo: Tobu Railway and Tobu Tower Sky Tree. Archived from the original on 2009-10-16. Retrieved 2009-10-16. 
  9. ^ [1]
  10. ^ "[Tokyo Sky Tree's height of the tower body exceeds 300m]" (in Japanese) (PDF). Rising East project. Retrieved 2010-02-18. 
  11. ^ "[Nothing very little about this miniature]". Asahi Shimbun. Retrieved 2010-03-25. 
  12. ^ Tokyo Sky Tree, already tallest building in Japan, tops 400 meters, Kyodo News, 30 July 2010
  13. ^ "[Skytree, actually at last became the tallest in Japan... 461m]" (in Japanese). Yomiuri Online. September 13, 2010.  (Archived by WebCite at
  14. ^ "東京スカイツリー® のつくり方「制振装置のあるゲイン塔頂部をつくる」 ["To make the tower tip with TMD installed", how to make Tokyo Sky Tree]" (in Japanese). Obayashi Corporation. 2010-11-25. Retrieved 2010-12-20. 
  15. ^ "総重量は約100トン。制振装置が塔体の最頂部へ [Total weight 100 ton, TMD placed on tower tip.]" (in Japanese). Blog from construction site, Obayashi Corporation. 2010-11-25. Retrieved 2010-11-25. 
  16. ^ "Tokyo Sky Tree tops 500 meters during construction". Japan Today. December 1. 
  17. ^ "東京スカイツリーへの放送局の無線設備の設置に向けた変更許可について [Approval of alteration to install the radio wave facility of broadcasting stations to Tokyo Sky Tree]" (in Japanese). Kanto Bureau of Telecommunications of Ministry of Internal Affairs and Communications. 2010-12-16. Retrieved 2010-12-19. 
  18. ^ "Tokyo Sky Tree tops 600 meters, becoming world's tallest tower". Japan Today. 1 March 2011. 
  19. ^ "世界一ツリー604メートル到達 東京スカイツリー [Tokyo Sky Tree reaches 604 m]" (in Japanese). Nikkei Inc.. 2011-03-02.;da=96958A88889DE2E0E3EAEAE7E6E2E0E3E3E0E0E2E2EBE2E2E2E2E2E2. Retrieved 2011-03-03. 
  20. ^ "スカイツリー、634メートルに到達 完成時の高さに [Sky Tree reaches final height of 634 m]" (in Japanese). Asahi Shimbun (Tokyo). Retrieved 2011-03-18. 
  21. ^ Yomiuri-online movie, dismantling on 23 May 2011 (Japanese)
  22. ^ "東京スカイツリータウンの事業概要が決定しました [Decided the business outline of Tokyo Sky Tree Town]" (in Japanese) (PDF). Tokyo Sky Tree Town. 2011-06-07. Retrieved 2011-06-08. 

External links

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