The Mega-structure proposed in Tokyo Bay during 1985-1990

Figure A – Sky City 1000, Takenaka Corporation; B – Holonic Tower, Takenaka Corporation


Figure A – X-Seed 4000, Taisei Corporation; B – Shimzu Mega-City Pyramid, Dante Bini, David Dimitric

The growth of population and implicitly the migration of population from the rural areas to Tokyo led to a high density of inhabitants and constructions. The Tokyo megacity is trying to solve more effectively problems concerning urban planning and energy consumption. Also, the need for vehicles, employed in the transit of large distances between the dormitory suburbs and city centres could be diminished. Urban transportation could be reduced through the proposed tall buildings or even through mega-structures able to meet the needs of their users.

One of the proposed mega-structure in Tokyo Bay is Shimzu Mega-City Pyramid. The shape of the construction is revealed from its name, a
pyramid 703 meters tall. The structure is divided into five main levels, each 146.4 meters high, in which the main functions are placed: housing, offices, research and leisure. The construction consists of 204 smaller pyramids, each having roughly the size of the Luxor Hotel from Las Vegas, placed one on top of another in a network of metal frames. The first three levels will accommodate approximately 50 square kilometres of residences, thus serving about 750 000 inhabitants; and 24 square kilometres destined for office spaces, able to receive around 800 000 workers. Leisure and research are to be located on the last two levels, summing a total of 14 square kilometres. It was assumed that this building could be completed in 2110, in the hope that by then the construction materials would evolve, such a structure needing materials both resistant and light.

Starting from the same ideas that accompany the projects that propose vertical cities and in order to combat the idea that living in a very tall tower leads to the isolation of its residents, Takenaka Corporation proposes a new vertical city where the residential and work areas would be bordered by green spaces for rest and play. The project bears the name Holonic Tower, its name deriving from the word holon, a word that expresses the concept of belonging to a community. The tower proposed by the Takenaka Corporation is a multifunctional, composite structure, which should reach 600 meters in height and should be able to host 500 inhabitants and 30 000 workers. The authors had an explicit intention to leave unbuilt spaces through which the air and light can pierce, in this way the standard of comfort for the residents would be increased.


Ioana Moldovan, Mega-structures, Super Tall Buildings, Ultra High Rise Buildings, (Technical University of Cluj-Napoca, 2012), 939-946.

1 Comment on “The Mega-structure proposed in Tokyo Bay during 1985-1990

  1. The example of Shimizu Mega-city Pyramid (I think you miss an “i” in the paragraph) is one interesting project. Actually Tokyo has suffered from the population issue all the time, and large mega structure project emerged since 1960s, such as Plan for Tokyo by Kenzo Tange. Looking through those conceptual proposal, you can see the progress and realization of partial concepts in the present Tokyo. My suggestion is to include more critical thinking. The data (height and capacity) is part of the project, but maybe you could discuss the similarities of those unbuilt project, as well as the relationship to the current realized mega-structures today.

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