Ohgishima Tunnel
HEIGHT: 7.05 m
WIDTH: 21.6 m
TOTAL IMMERSED LENGTH: 660.4 m
DEPTH AT BOTTOM OF STRUCTURE: 21 m
ENVIRONMENTAL CONDITIONS: 0.4 m/s current
FABRICATION METHOD: Steel shell assembled in shallow drydock 3.3 km from tunnel site. Fully closed box section was constructed including bulkheads and interior reinforcing steel.
WIDTH: 21.6 m
TOTAL IMMERSED LENGTH: 660.4 m
DEPTH AT BOTTOM OF STRUCTURE: 21 m
ENVIRONMENTAL CONDITIONS: 0.4 m/s current
FABRICATION METHOD: Steel shell assembled in shallow drydock 3.3 km from tunnel site. Fully closed box section was constructed including bulkheads and interior reinforcing steel.
Kanagawa,
Japan
NKK Corporation
Taisei Corporation
Christiani & Nielsen, Copenhagen for sinking and founding
110m
660.4m
21m
Project construction
1974-04-30
6
Three tubes; two tubes each with two lanes, one tube for conveyor belt.
7.05m
21.6m
Jetted sand foundation mixed with aluminous cement clinker binder to help achieve
compaction and preclude liquefaction. Steel shell used to provide flexibility for better
earthquake resistance. Final joint between the last element and cut and cover tunnel
was sealed with gasketted steel panels.
compaction and preclude liquefaction. Steel shell used to provide flexibility for better
earthquake resistance. Final joint between the last element and cut and cover tunnel
was sealed with gasketted steel panels.
Steel shell assembled in shallow drydock 3.3 km from
tunnel site. Fully closed box section was constructed
including bulkheads and interior reinforcing steel.
tunnel site. Fully closed box section was constructed
including bulkheads and interior reinforcing steel.
Outfitted at a wharf 1.6 km
from the tunnel site; concrete
placed from barges
from the tunnel site; concrete
placed from barges
0.4 m/s current
Transverse pontoons and two alignment/control towers with interior access shaft. Joint
closure and alignment jacks actuated from within the element.
closure and alignment jacks actuated from within the element.
Gina-type joints with steel
Omega; steel rods coupled
across joints; steel panel
joints at cut-and-cover
structures.
Omega; steel rods coupled
across joints; steel panel
joints at cut-and-cover
structures.
Continuous steel shell
Jetted sand foundation treated to prevent liquefaction (see above)
Sand backfill and rubble stone protection