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Double-deck elevators at Midland Square, Nagoya, Japan

A double-deck elevator or double-deck lift is an elevator with two cabs attached together, one on top of the other. This allows passengers on two consecutive floors to be able to use the elevator simultaneously, significantly increasing the passenger capacity of an elevator shaft. Such a scheme can improve efficiency in buildings where the volume of traffic would normally have a single elevator stopping at every floor. For example, a passenger may board the lower deck (which serves only odd-numbered floors) on the concourse level while another passenger may board the upper deck (which serves even-numbered floors) on the ground floor. The cab serving even floors is actually on top of the cab serving odd floors in the same elevator shaft. When a passenger disembarks from the even-floor serving cab at level 30, for instance, the passengers in the odd-floor serving cab beneath it are kept waiting until the elevator doors above close.

Architecturally, this is important, as double-deck elevators occupy less building core space than traditional single-deck elevators do for the same level of traffic. In skyscrapers, this allows for much more efficient use of space, as the floor area required by elevators tends to be quite significant. The other main technique is shared-shaft elevators, where multiple elevators use different sections of the same shaft to serve different floors, with skylobbies separating the sections.

Double-deck goods/passenger elevators

Mori Tower: Lower lobby for odd-numbered floors, upper lobby for even-numbered floors

Not all double-deck elevators are used to transport passengers simultaneously in both decks. Sometimes one or more elevators in a building has a double-deck car, where the second deck is used for transportation of goods, typically outside of peak traffic periods. This technique has the advantages of preventing damage to interior fixtures due to impact from trolleys, and does not require a dedicated shaft solely devoted to a goods-only elevator car. During peak periods, the car is switched back to passenger mode, where it can expedite passenger movement into or out of the building.

As of 2011, no triple-deck elevators have been built, although such a design had been considered for the 163-floor Burj Khalifa before the final design was scaled back to double-deck.^[1] Also, Frank Lloyd Wright had envisioned five-deck elevators in his 1956 proposed Mile High Illinois.

List of structures with double-deck passenger elevators

Asia

• 
  8 Shenton Way in Singapore
  


• 
  Beijing Yintai Centre in Beijing
  


• 
  Bitexco Financial Tower in Ho Chi Minh City
  


• 
  Canton Tower in Guangzhou
  


• 
  Capital Tower in Singapore


• 
  Guangzhou CTF Finance Centre in Guangzhou


• DBS Building Tower 2 in Singapore


• 
  


• 
  Hysan Place in Hong Kong
  


• 
  International Commerce Centre in Hong Kong


• 
  Lotte World Tower in Seoul


• 
  


• 
  Menara Telekom in Kuala Lumpur
  


• 
  Midland Square in Nagoya (pictured on the top of the page)


• 
  One Island East in Hong Kong


• 
  One San Miguel Avenue in Pasig City, the Philippines


• 
  Petronas Twin Towers in Kuala Lumpur


• 
  Ping An Finance Centre in Shenzhen
  


• 
  Raffles City in Singapore


• 
  Republic Plaza in Singapore


• 
  Roppongi Hills Mori Tower in Tokyo
  


• 
  Shanghai World Financial Center in Shanghai


• 
  Shanghai Tower in Shanghai


• 
  Sun Hung Kai Centre in Hong Kong


• 
  Taipei 101 in Taipei
  


• 
  Taipei Nan Shan Plaza in Taipei
  


• 
  The Concourse in Singapore
  


• 
  Tianjin World Financial Center in Tianjin
  


• 
  Two International Finance Centre in Hong Kong


• 
  World Trade Centre in Hong Kong


• 
  Bahria Icon Tower in Karachi

Australia

• 201 Elizabeth St (formerly the Pacific Power building) in Sydney
  


• 
  Sydney Tower in Sydney


• Twin Towers complex in the Sydney suburb of Chatswood
  

North America

• 
  120 Park Avenue in New York
  


• 
  388 Greenwich Street in New York


• 
  Aon Center in Chicago
  


• 
  AT&T Center in St. Louis
  


• 
  Bank of America Plaza in Dallas
  


• 
  Bentall Centre Complex in Vancouver
  


• 
  C. D. Howe Building / 240 Sparks Street in Ottawa
  


• 
  Citigroup Center in New York City
  


• 
  Commerce Court in Toronto (used for lower floors only)


• 
  First Canadian Place in Toronto


• 
  Goldman Sachs on 200 West St in New York


• 
  John Hancock Tower in Boston
  


• 
  One Nationwide Plaza in Columbus
  


• 
  Renaissance Tower in Dallas


• 
  Republic Plaza in Denver
  


• 
  Scotia Plaza in Toronto


• 
  Statue of Liberty in New York (goes no higher than the pedestal)


• 
  Stratosphere Tower in Las Vegas
  


• 
  Time-Life Building in Chicago


• 
  Wells Fargo Tower in Houston (used as skylobby shuttles only)


• 
  Willis Tower in Chicago (used as skylobby shuttles only)


• 
  Wilshire Grand Center in Los Angeles
  

South America

• 
  University of Belgrano in Buenos Aires
  

Europe

• 
  20 Fenchurch Street in London
  


• 
  Broadgate Tower in London


• 
  Eiffel Tower in Paris
  


• 
  Heron Tower in London


• 
  The Shard in London


• 
  The News Building in London


• 
  Torre Picasso in Madrid
  


• 
  Tower 42 in London


• 
  Warsaw Spire in Warsaw
  


• 
  Levent 199 in Istanbul
  


• 
  Begovaya Tower in Moscow
  

Middle East

• 
  Burj Khalifa in Dubai (used as shuttles to a sky lobby (lower deck) and At the Top observatory (upper deck))


• 
  Capital Plaza in Abu Dhabi (UAE)


• World Trade Centre in Abu Dhabi
  

See also

• Skytrak

References

External links

• How do they work?


• Skytrak