Keiyo Line Haneda Tunnel (under Tama River)
TOTAL IMMERSED LENGTH: 480 m
DEPTH AT BOTTOM OF STRUCTURE: 17 m below datum
HEIGHT: 7.95 m (Typ.)
WIDTH: 13.0 m (Typ.)
ENVIRONMENTAL CONDITIONS: Height restriction (10 m. From sea level) due to adjacent Haneda International Airport.
FABRICATION METHOD: Steel shell fabricated at shipyard
DEPTH AT BOTTOM OF STRUCTURE: 17 m below datum
HEIGHT: 7.95 m (Typ.)
WIDTH: 13.0 m (Typ.)
ENVIRONMENTAL CONDITIONS: Height restriction (10 m. From sea level) due to adjacent Haneda International Airport.
FABRICATION METHOD: Steel shell fabricated at shipyard
Tokyo,
Japan
Japan Railway Constructon Public Corporation
Kajima Corporation and Ohbayashi Corporation
80m
480m
17m
Project construction
1970-04-30
6
Two tubes; one track each
7.95m (Typ.)
13.0m (Typ.)
Binocular shaped steel-shell section for railway tunnels. Immersed elements tie into
pneumatic caissons at both ends. Three pick-up points were used for placing.
Ventilation tower was constructed by pneumatic caisson method. Last element was
specially designed to transition to bored tunnels.
pneumatic caissons at both ends. Three pick-up points were used for placing.
Ventilation tower was constructed by pneumatic caisson method. Last element was
specially designed to transition to bored tunnels.
Steel shell fabricated at
shipyard
shipyard
At jetty in back of trench
excavation.
excavation.
Height restriction (10 m. From sea level) due to adjacent Haneda International Airport
Placed by catamaran barges.
Double gasket and steel closure plate.
Continuous steel shell provided with cathodic protection
70 cm of 20 to 40 mm crushed stone was placed and screeded. Five telescopic gravel
pipes equipped with hoppers fed material to screed box. Spreader ran on rails installed
underwater, supported on piles.
pipes equipped with hoppers fed material to screed box. Spreader ran on rails installed
underwater, supported on piles.
3.0 m of protection using riprapped slopes of crushed stone and sand backfill.