Sinking a Tunnel in Tokyo Bay


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Title: Sinking a Tunnel in Tokyo Bay

Author(s): William D. Palmer, Jr.

Publication: Concrete International

Volume: 11

Issue: 12

Appears on pages(s): 21-26

Keywords: concrete construction; precast concrete; prestressing steels; reinforced concrete; tunnels; underwater structures; vehicular tunnels; Design

Date: 12/1/1989

Describes the Tama River and Kawasaki Fairway Tunnels project, part of the Tokyo Bay Ring Highway project linking Tokyo and Yokohama, Japan's two most populous cities. The tunnels will be constructed of 10 m high, 40 m wide, and 130 m long concrete boxes (elements) that will be floated into position, submerged, and joined using hydrostatic pressure. The Tama River Tunnel will be 1550 m long, using 12 elements; the Kawasaki Fairway Tunnel will be 1190 m long, using 9 elements. The tunnels are expected to go into service in early 1995.