1. Introduction
In Tokyo, super high-rise housings have been rapidly increasing since 2000. Now there are 327 buildings of over 60m and 135 buildings exceed 100m height. Those housings show one of the aspects of high density dwellings.
The planning of all super high-rise housings are different from that of mid-to-high-rise housings. Though numbers of super-high-rise housings are expected to increase in the future, we have few academic studies on planning of super-high-rise housings.
Therefore we studied on 99 super-high-rise housings of 102 buildings exceed 100m height, in the center area pf Tokyo.
2. The purpose of this study is as follows;
1) To show building regulations revisions which influenced typical floor planning of super-high-rise housings.
2) To analyze relations with building regulations revisions and types of typical floor planning consisting of the layout of dwelling units and core plan.
3) To analyze relations with building regulations revisions and perimeter of exterior wall consisting of the structure frame, layout of balcony and shape of corner parts.
3. The conclusion of this study is as follows;
1) The building regulations revisions influenced planning of super-high-rise housings are as follows, the capacity limitation for tower parking system set in the building, the calculation rules for floor area ratio, and guidance for layout of balcony and core.
2) We classified typical floor planning from aspects of 3 factors as follows. Plan types consist of 3 types, square plan, square plan with void space, and rectangular plan. The dwelling unit layout types consist of 4 types , 1 side to 4 side layout. The core layout types consist of 2 types, central core and eccentric core. From the above-mentioned combinations, typical floor planning is classified into 9 types. Most of the buildings with over 1,000 m2 typical floor area are designed with void space. Rectangular plan tend to be built for site with limited spaces.
3) We classified the perimeter of exterior wall from aspects of 3 factors as follows. Structure frame types consist of 2 types, inner-frame and outer-frame. The inner frame structure type is favorable for the construction cost reduction. The balcony layout types consist of 3types, continuous, except corner part and dispersive type. Corner shape types consist of 6 types, square, curved, corner cut, etc. Almost all of the inner-frame structure types have continuous balcony, and most of the outer-frame structure types have except corner or dispersive balcony layout. The dispersive balcony layout type is favorable for high density dwellings. In early 1989-2000, many buildings have complex corner shape, but in recent 2000-2010 tend to be decreased.
4) The influence by building regulations revisions is as follows; increase case of tower parking system set in the building, enable typical floor planning to be larger and buildings to be higher than before, enable core to be 4 side surrounded by dwelling unit, enable balcony layout to be dispersive. Those revisions came into force in order to facilitate planning according to floor area ratio premium.
5) In inland urban area, residential buildings are often built under comprehensive design system, and applied favorable typical floor planning for high density dwellings. While in coastal area, residential buildings are often built under district planning system, and applied favorable typical floor planning for the construction cost reduction.
6) In recent years from 2004, large scale building with typical floor area over 1,500 m2, with void space, 4 side dwelling unit layout, and simple corner shape are tend to be increased. Therefor now we are facing the problems of the huge residential buildings which make people feel stressed and monotonous in immediate area.
