Ajigawa Riverbed Road Tunnel - Ajigawa Riverbed Road Tunnel

...Subways in major cities have been actively constructed since 1960, and many of them cross rivers and canals, and are constructed using air pressure shields and other construction methods. The first immersed tunnel was the Ajigawa River Underwater Road Tunnel in Osaka City, built in 1944, but the first full-scale tunnel was the Haneda Tunnel on the Keiyo Line of the Japanese National Railways (now JR), which was completed in 1972 and has a total length of 5,980 m. The tunnels under the Tama River (480 m) and the Keihin Canal (328 m) were constructed using the immersed tunnel method, and the Morigasaki Canal (866 m) was constructed using a slurry pressure shield. Other tunnels include the Tokyo Port Tunnel (1,325 m), Kawasaki Port Undersea Tunnel (1,160 m), and Tokyo No. 2 Sea Route Undersea Tunnel (1,084 m), as well as the Daiba Tunnel on the Keiyo Line (4,756 m). A large-scale undersea tunnel, the Seikan Tunnel (53.85 km long, 23.3 km undersea), was constructed using normal construction methods in conjunction with chemical grouting and opened in 1988. ...

*Some of the terminology used in reference to the "Ajigawa Riverbed Road Tunnel" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…大都市の地下鉄は60年以降建設が盛んとなり，河川，運河の横断も多く，圧気シールドやその他の工法で施工されている。沈埋工法では1944年の大阪市安治川河底道路トンネルが最初であるが，本格的なものは72年完成の全延長が5980mの国鉄(現JR)京葉線の羽田トンネルであり，多摩川(480m)と京浜運河(328m)の下は沈埋式で，森ヶ崎運河(866m)は泥水加圧式シールドで施工している。このほか東京港トンネル(1325m)，川崎港海底トンネル(1160m)，東京第2航路海底トンネル(1084m)の各道路トンネルや京葉線の台場トンネル(4756m)などがあり，また大規模な海底トンネルとしては青函トンネル(延長53.85km，海底部23.3km)が薬液注入を併用した普通工法で施され88年開通した。…

※「安治川河底道路トンネル」について言及している用語解説の一部を掲載しています。

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