velopment is due for completion in the late summer of this year. Facili- ties will include 24 classrooms. science laboratories, arts and crafts room, library, music room, health room, administration office. a dual purpose gymnasium with stage equip- ment and a cafeteria.
The round structure in the form of a spheroid, rests on twelve V-shaped columns and gives the impression of floating above the ground. The columns stand on a rectangular ter- race which on one side goes over into a large round pond.
a self-
The principal building connects with a service building where there are cloak-rooms, lavatories, service restaurant, telephone booths, and an information counter. It con- tains in addition an auditorium with 100 seats, a library, and a number of service rooms.
Next to the principal building there is a 197 ft. concrete tower, almost 10 ft. in diameter and octagonal in plan. At heights of 131 ft. and 197 ft. cross-members project on which all manner of equipment, such as TV cameras, radar, and flood-lights may be installed.
The principal building has a dia- meter of 77 metres, and its highest point is 30 metres above the ground. The building stands on a so-called foundation box, consisting of two layers in which a number of service rooms are accommodated. Here also are the high and low tension rooms and the air cleaning and conditioning equipment for control of temperature and moisture content.
Inside the building a lift for 40 persons moves in a glass shaft. Next to it there is also a concrete shaft for a small service lift and for ventilation.
The lower shell of the superstruc- ture is bowl-shaped with a large open- ing in the middle. It is supported or the columns by steel hinges, each carrying 625 tons. These hinges are necessary in connection with changes in shape to which the lower shell is subjected on account of changes in temperature.
The lower shell consists of 3 x 96 prefabricated concrete elements
which, like the staves of a barrel, are held together by a hoop. The hoop in this case consists of steel tensile cables of 12 mm. diameter and a total length of 160 km. They are accom- modated in hollow pipes and were stressed and fixed after the concrete has hardened.
Upper Shell
The upper shell consists entirely of concrete a ring-shaped concrete beam in which there are again tensile cables, 822 concrete elements each weighing 1.200 kg, and a ring-shaped upper edge on which, finally, there is a transparent light dome of 26 ft. diameter. The upper shell contains 48 large windows.
In order to avoid heavy stresses at
Far East Architect & Builder February, 1967
low outside tem- peratures and nor- mal inside tem- peratures it was found necessary to fit the upper shell loose on the lower shell, SO that they can ex- pand and contract independently of each other.
Inside the spheroid there are three rings arrang- ed in tiers like those of an am- phitheatre. The biggest has a length of more than furlong and a width like that of a road. Not counting lobbies, etc. there is a total exhibition area of 2,800 sq.
metres.
а
After the construction of the two- storey basement and the columns the 288 precast concrete elements of the lower dish were placed on scaffold- ing, and on it were cost the three annular floors on different levels of the exposition hall.
The vertical outer wall (ring beam) of the second level supporting the second level supporting the third floor was prestressed with Freyssinet cables 12 1⁄2 in. Similar cables were used for prestressing the outer beam of the third floor (edge beam).
Roofing of the dome is made up of 822 precast, hexagonal elements. The edge beam of this dome was prestressed with Freyssinet cables 12
1⁄2 in. Rubber bearings were placed between the prestressed edge beams of the two dishes.
The calculations for the spheroid were made by the National Physical Hol- Laboratory, of Delft. Messrs. landse Beton Maatschappij acted as contractor, and the whole project was realized under the supervision of the
VAVAVAKYATANANEMI
Evoluon under construction in early 1966
Ceiling of upper shell
Building. Design, and Plant Engineer- ing Division of Philips which headed by Mr. C. Westra.
was
Hexagonal roof units in position
43
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