The raising of the center section of the timber roof of the gymnastics venue for the 2020 Tokyo Olympics took place Wednesday, with the under-construction interior opened to the media.The second of five sections of the Ariake Gymnastics Center roof that was raised is 70 meters wide and weighs 200 tons, one of the world's largest timber roofs. Once completed, the overall roof will be around 120 meters long and 90 meters wide.Expected to be completed by October next year, the facility features domestic wood as a primary material. Aspects of Japanese culture and traditional building methods ar…READ FULL ARTICLE