Tokyo Tower - Construction

Construction

A large broadcasting tower was needed in the Kantō region after NHK, Japan's public broadcasting station, began television broadcasting in 1953. Private broadcasting companies began operating in the months following the construction of NHK's own transmission tower. This communications boom led the Japanese government to believe that transmission towers would soon be built all over Tokyo, eventually overrunning the city. The proposed solution was the construction of one large tower capable of transmitting to the entire region. Furthermore, because of the country's postwar boom in the 1950s, Japan was searching for a monument to symbolize its ascendancy as a global economic powerhouse.

Hisakichi Maeda, founder and president of Nippon Denpatō, the tower's owner and operator, originally planned for the tower to be taller than the Empire State Building, which at 381 meters was the highest structure in the world. However, the plan fell through because of the lack of both funds and materials. The tower's height was eventually determined by the distance the TV stations needed to transmit throughout the Kantō region, a distance of about 150 kilometres (93 mi). Tachū Naitō, renowned designer of tall buildings in Japan, was chosen to design the newly proposed tower. Looking to the Western world for inspiration, Naitō based his design on the Eiffel Tower in Paris, France. With the help of engineering company Nikken Sekkei Ltd., Naitō claimed his design could withstand earthquakes with twice the intensity of the 1923 Great Kantō earthquake or typhoons with wind speeds of up to 220 kilometres per hour (140 mph).

The new construction project attracted hundreds of tobi, traditional Japanese construction workers who specialized in the construction of high-rise structures. The Takenaka Corporation broke ground in June 1957 and each day at least 400 laborers worked on the tower. It was constructed of steel, a third of which was scrap metal taken from US tanks damaged in the Korean War. When the 90-metre antenna was bolted into place on October 14, 1958, Tokyo Tower was the tallest freestanding tower in the world, taking the title from the Eiffel Tower by 13 metres. Despite being taller than the Eiffel Tower, Tokyo Tower only weighs about 4,000 tons, 3,300 tons less than the Eiffel Tower. While other towers have since surpassed Tokyo Tower's height, the structure is still the tallest self-supporting steel structure in the world and was the tallest artificial structure in Japan until April 2010, when the new Tokyo Skytree became the tallest building of Japan. It was opened to the public on December 23, 1958 at a final cost of ¥2.8 billion ($8.4 million in 1958). Tokyo Tower was mortgaged for ¥10 billion in 2000.