Keiyo Line Haneda Tunnel (under Keihin Channel)
TOTAL IMMERSED LENGTH: 480m
DEPTH AT BOTTOM OF STRUCTURE: 17.70 m.
HEIGHT: 7.97 m
WIDTH: 13.00 m
ENVIRONMENTAL CONDITIONS: The height of crane booms was limited by the proximity to Haneda International Airport.
FABRICATION METHOD: Steel shell fabricated at shipyard.
DEPTH AT BOTTOM OF STRUCTURE: 17.70 m.
HEIGHT: 7.97 m
WIDTH: 13.00 m
ENVIRONMENTAL CONDITIONS: The height of crane booms was limited by the proximity to Haneda International Airport.
FABRICATION METHOD: Steel shell fabricated at shipyard.
Tokyo,
Japan
Japan Railway Construction Corporation
Kumagai Gami, Co., Ltd.
80m
480m
17.70m
Project construction
1970-04-30
6
Two tubes; one track each
7.97m
13m
Binocular shaped steel shell section for railway tunnels. Immersed tunnel elements tie
into pneumatic caissons at both ends of tunnel.
into pneumatic caissons at both ends of tunnel.
Steel shell fabricated at
shipyard.
shipyard.
At jetty near site.
The height of crane booms was limited by the proximity to Haneda International Airport.
Placed by catamaran barges.
Double rubber gaskets. Joint connecting sealing area is
provided outside of main tunnel structural section,
permitting rigid connection.
provided outside of main tunnel structural section,
permitting rigid connection.
Continuous steel shell provided with cathodic protection system.
70 cm of 20 mm - 40 mm crushed stone was placed and screeded using screed box
and mechanical screeding device. Five telescopic gravel pipes equipped with hoppers
fed material to the screed box. This spreader ran on rails installed under water and
supported on piles.
and mechanical screeding device. Five telescopic gravel pipes equipped with hoppers
fed material to the screed box. This spreader ran on rails installed under water and
supported on piles.
3 m of sand backfill.