CANADA
單
Model of Japanese Pavilion site
JAPANESE PAVILION EXPO 67
ONE of the most unusual structures
at Expo 67. the World Exhibi- tion in Montreal which opened last month, is the Japanese Pavilion. Con- structed from a prestressed concrete beam system manufactured in Japan, it was completed in only six months and may be quickly dismantled when the exhibition is over.
By utilising these wall beams, which are composed of precast jointed beams post-tensioned in required lengths, it has been possible to erect a structure with very large spans between the walls.
The system used is the Leoba pro- cess, developed by Dr. Ing. Leonhardt and Dipl. Ing. Baur. There are several groups according to the types of prestressing system and the sizes and number of prestressing wires used. It is not only applicable to prestressed concrete work of simple beam struc-
tures but also to complicated rigid frame construction.
Wall beams in the Japanese Pavilion are composed of two to three sections of precast concrete beams with two hollow openings in the centre through which the prestressing strands are passed and post-tensioned to form continuous wall beams, using Leoba S-66 and K-66 in combination.
Three Sections
Leoba S-66 is an end loop system, by which the prestressing wires at the movable end are bent to a small radius and held by a small steel anchor piece of the cross type. In the Leoba K-66 system the prestressing wires are anchored to a steel piece by a wedge and
can be prestressed from and couple-jointed at both ends.
The lot of the Japanese Pavilion is
on
situated the island, Ile Sainte- Helene, in the middle of the St. Lawrence River. The architect has made the best of this location by lift- ing the main structure above ground floor level, so embracing views of the river and Montreal in the background.
The entire exhibition space is divided into three major sections with noticeable changes in floor height, Visitors are led first to the highest section of the exhibition area and are then guided through the three sections at a gradual descent. On leaving the last hall they may pass into a Japanese garden or an adjoining Japanese re-
staurant.
The pavilion which has a total floor area of 27,007 sq. ft., was designed by Mr. Yoshinobu Ashihara and was built jointly by Taisei Con- struction Co.. Ltd., Tokyo, and Janin Construction Ltd.. Canada.
East side view of completed building
52
ويتر
Erection of prestressed concrete beams
Far East Architect & Builder May, 1967