
01 · Yoyogi National Stadium 1st Gymnasium
Two main cables hold up the whole roof
Two main cables pass over 40-meter pylons and carry the roof above an arena for more than 10,000 spectators.
Do not start by looking for rows of roof columns. At the First Gymnasium, two main cables pass over 40-meter pylons; wire ropes and preformed steel frames hang the roof below, leaving the competition floor free of supporting columns. The builders had just 18 months. They finished on August 31, 1964, 39 days before the Olympic opening ceremony. Walk the public paths and the sag of the cables and lift of the roof edge still show where the weight goes.
Source: jpnsport.go.jp Source: jpnsport.go.jp Source: jpnsport.go.jp

