CHRONICLE

1970-1989

Assuring a strong presence both domestically and internationally through technological innovation and multiple talents

1970

1970

TOC (Tokyo Oroshiuri Center)

Tokyo

1970

Kintetsu Railway Namba Shield [Uehommachi station- Namba station]

Osaka

Difficult construction work that made the impossible possible

The Mt. Fuji Summit Radar Site is a facility for meteorological observation constructed after the loss of many human lives in the Typhoon Vera. The construction work was extremely severe. While suffering from permafrost, sudden intense wind and snow, and altitude sickness, the site was completed in 1964 through the efforts of 9,000 people in total. We also engaged in construction work for remodeling the severely timeworn, wooden meteorological station from 1970 until 1973. The Mt. Fuji Summit Radar Site served well as a place for typhoon observation since its opening. However, with the emergence of meteorological satellites and the like, its 35-year contributions came to an end in 1999.

1971

Okurayama Schanze [ski jump studium]

Hokkaido

1972

Nakagin Capsule Tower

Tokyo

1972

Houheikyo Dam

Hokkaido

1974

Hotel New Otani Tokyo Garden Tower

Tokyo

1976

Sompo Japan head office building

Tokyo

1978

Joetsu Sinkansen Line Daishimizu Tunnel

Niigata

1979

Shinjuku Center Building

Tokyo

1980

1982

The Symphony Hall

Osaka

1983

Osakajo Hall

Osaka

1984

Hilton Tokyo (Shinjuku Kokusai Building)

Tokyo

1985

UBN Complex Building, Malaysia

Malaysia

1985

Minami & Kita Bisan-Seto Bridges[substructure, North segment]

Kagawa

1986

Twin 21

Osaka

1986

ANA INTERCONTINENTAL-TOKYO

Tokyo

1987

Seikan Tunnel [Yoshioka section]

Hokkaido

1988

Sheraton Grande Tokyo Bay Hotel & Towers

Chiba

1988

Metropolitan Expressway,Bayshore Route, Yokohama Bay Bridge

Kanagawa

1988

Cirata Hydroelectric Power Plant, Indonesia

Indonesia

Seikan Tunnel and Seto Ohashi Bridge

On March 13, 1988, the Seikan Tunnel, which was the world’s longest undersea tunnel (at the time), was opened. On April 10, the Seto Ohashi Bridge, which connects Honshu to Shikoku through the Kojima-Sakaide route, was opened. Both are historic projects unparalleled in the world in terms of scale and technical difficulty. When building the Seikan Tunnel, our joint venture was responsible for the Yoshioka construction section on the side of Hokkaido. We constructed a working pit (9.1 km) and a main pit (14.7 km). Even during the middle of winter, a temperature of 32°C and humidity of 80% to 90% remained at all times. Workers felt stifled under such conditions and unexpectedly experienced two floods involving large amounts of water, in addition to a sizable earthquake. Overcoming these difficulties, we completed this huge project approximately 15 years after its commencement. For the Minami- and Kita-Bisan Seto Ohashi Bridge, our joint venture was in charge of substructure spanning a long distance (about 1,600 m) in the northern construction area. We built a gigantic underwater offshore structure while overcoming severe metrological and hydrographic conditions in the Seto Inland Sea, such as intense tidal current, high water and wave pressures, and raging wind, while giving consideration to passing ships and fishing spots.