From1961Phenomenal Growth
As Japan's economy continued to grow rapidly, Kumagai Gumi's Construction Division continuously received the BCS Award, the most prestigious award in the construction industry and also demonstrated remarkable development, such as the independent construction of super high-rise buildings. The Civil Engineering Division continued to make civil engineering history in Japan, such as being the first to implement NATM, which became the standard method for tunnel construction in Japan. Kumagai Gumi also began expanding its business overseas with waterway construction in Hong Kong.
1961
- March
- Construction completed of Wakato Bridge, the first long suspension bridge in Japan
1963
- March
- Construction completed of the Nagoya City High-speed Railway Kakuouzan Tunnel using the circular shield method employing concrete segments for the first time in Japan
- July
- Construction completed of the Tokaido Shinkansen Izumigoe Tunnel for which the wall plate drift method developed by Kumagai Gumi was used for the first time in the world
- October
- Revised corporate logo
1966
- August
- Construction completed of the Hong Kong Plover Cove Headrace Tunnel, Kumagai Gumi's first overseas project
1967
- November
- Jinichi Makita appointed as president
1969
- February
- Construction completed of the Chiyoda Line Ochanomizu Station, Japan's first eyeglasses type shielded subway station
1970
- April
- Public stock offering
1974
- March
- Construction of the new headquarters building completed (current headquarters building)
1978
- May
- Construction completed of the Shinjuku Nomura Building, the first independent construction of a super high-rise building in Japan
- 12月
- Taichiro Kumagai appointed as president