On June 30, 2023, the assembly of the Grand Roof (Ring) that will be the symbol of the Expo site began in the PW Northeast construction area on Yumeshima, Osaka, the site of Expo 2025 Osaka, Kansai, Japan.
The units, consisting of 420mm square lumbers and 210mm x 420mm beam timbers pre-assembled on the ground, were lifted and put together by crawler cranes. The wooden Ring will be assembled sequentially from the areas where the foundation work is completed. When completed, the Grand Roof (Ring) will be one of the largest wooden structures in the world, with an inner diameter of approximately 615 meters and a circumference of approximately 2 km.
The PW Northeast construction area facility development project is being undertaken by OBAYASHI-DAITETSU KOGYO-TSUCHIYA Joint Venture and Yasui Architects & Engineers, Inc.
Public Relations Department, Japan Association for the 2025 World Exposition