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Coastal structures

Steel caissons, L-shaped caissons (for land reclamation and partition of revetment)

Steel caissons and steel L-shaped caissons consist of steel external walls, a steel bulkhead, and an SRC or steel bottom slab.
Although most of the features of these caissons are also those of hybrid caissons, lighter and longer caissons can be constructed as their dead weight during manufacture is light because of the small amount of concrete used. Additional features are a small amount of concrete work and a reduced manufacturing period. Steel caissons and steel L-shaped caissons are widely adopted for their economy and rapid construction as their steel members do not require a long-period anticorrosive function when used for partition of revetment in large-scale land reclamation.

Construction examples

Name of construction work
Temporary revetment caisson manufacturing work in Naoetsunishi
Client
Niigata Prefecture
Purpose/Function
Temporary revetment
Year completed
1999
Dimensions (m)
Height = 6.5, width (upper/lower) = 5.2/7.2, length = 74.8
Quantity (/element)
Dead weight = 843 tons, (steel = 215 tons, Con. = 344 m3)
Design overview
Installation water depth: -5.0 m
Features
Length of caisson: 74.8 m
Remarks
Bottom slab RC structure, sea-side external wall covered with concrete
Name of construction work
Steel caisson manufacturing work in Dejima Zone, Hiroshima Prefecture
Client
Hiroshima Port and Harbor Promotion Bureau, Hiroshima Prefecture
Purpose/Function
Temporary revetment
Year completed
1997 to 1998
Dimensions (m)
Height = 11.5, width (upper/lower) = 5.0/10.0, length = 40.0
Quantity (/element)
Dead weight = 589 tons, (steel = 157 tons, Con. = 175 m3)
Design overview
Installation water depth: -7.5 m
Features
Bottom slab SRC structure (overhanging length of footing = 2.5 m)
Name of construction work
Minamihonboku reclamation work
Client
Port and Harbor Bureau, City of Yokohama
Purpose/Function
Partition of revetment
Year completed
1991 to 1997
Dimensions (m)
Height = 26.6, width (upper/lower) = 14.0/24.0, length = 50.0
Quantity (/element)
Dead weight = 1446 tons, (steel = 1170 tons)
Design overview
Installation water depth: -23.6 m, design seismic coefficient Kh = 0.10
Features
Bottom slab steel structure (overhanging length of footing = 5.0 m)
Name of construction work
Temporary revetment caisson manufacturing work in Hibikinada West Waste Disposal Site
Client
Hibikinada Development Co., Ltd.
Purpose/Function
Partition of revetment (controlled reclamation)
Year completed
1997
Dimensions (m)
Height = 11.5, width (upper/lower) = 6.4/8.9, length = 25.0
Quantity (/element)
Dead weight = 324 tons, (steel = 61.3 tons, Con. = 111 m3
Design overview
Installation water depth: -8.0 m
Features
Bottom slab RC structure (overhanging length of sea-side footing = 2.5 m), controlled reclamation