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Coastal structures

Jackets (for piers)

”Jackets” means 3-dimensional steel pipe truss structures covering a steel pipe pile. They are designed to be fixed on the seabed with the steel pipe pile (stationary type steel pipe truss piers for direct mounting are also available). A steel pipe truss helps increase rigidity and the design seismic coefficient. Jackets can be manufactured in a plant and erected with single operation, so it is possible to keep high-quality and a reduced construction period. Jackets are also effective in the forward placement of existing quay walls in addition to the construction of new piers, and they make it possible to construct not only regular piers but also piers with a backfill-retaining function.

Construction examples

Name of construction work
Quay wall (-13 m) construction work in Honmoku Zone of Yokohama Port
Client
Ministry of Land, Infrastructure, Transport and Tourism Kanto Regional Development Bureau
Purpose/Function
Container terminal (-13 m)
Year completed
2009
Dimensions (m)
47.5 (length) × 15.6 (width) × 7.3 (height)
Quantity (/case)
Weight: 203 tons
Design overview
Installation water depth: -13 m
Features
Precedent pile: 6 pieces/10 pieces in all
Name of construction work
Quay wall (-16 m) - construction work in Kitakonan Zone of Osaka Port
Client
Ministry of Land, Infrastructure, Transport and Tourism Kinki Regional Development Bureau
Purpose/Function
Container terminal (-16 m)
Year completed
2008
Dimensions (m)
50 (length) × 37 (width) × 17 (height)
Quantity (/case)
Weight: 540 tons
Design overview
nstallation water depth: -16 m
Features
Precedent pile: 6 pieces/18 pieces in all
Name of construction work
Quay wall (-15 m) jacket construction work in Island City Zone of Hakata Port
Client
Ministry of Land, Infrastructure, Transport and Tourism Kyushu Regional Development Bureau
Purpose/Function
Container terminal quay wall
Year completed
2006
Dimensions (m)
70 (length) × 15 (width) × 9.3 (height)
Quantity (/case)
Weight: 370 tons
Design overview
Installation water depth: -15 m
Features
Anticorrosive treatment: Stainless lining
Name of construction work
Development work of shipping terminal for soil generated by construction of reclaimed land inside central breakwater in Tokyo Port
Client
Tokyo Port Terminal Corporation
Purpose/Function
Pier for shipment of earth and soil
Year completed
2005
Dimensions (m)
Length = 15.35, width = 15.55, height = 3.0
Quantity (/case)
Dead weight = 67 tons
Design overview
Installation water depth: +1.0 m
Features
Precedent pile: 9 pieces/9 pieces in all
Remarks
Steel slipway (326 tons) formed on newly constructed and existing piers
Name of construction work
South quay wall (-16 m) manufacturing and construction work in Tobishima Pier
Client
Ministry of Land, Infrastructure, Transport and Tourism Chubu Regional Development Bureau
Purpose/Function
Container terminal (-16 m)
Year completed
2005
Dimensions (m)
Length = 13.9, width = 50.0, height = 17.9
Quantity (/case)
Dead weight = 560 tons
Design overview
Installation water depth: -13.6 m
Features
Precedent pile: 5 pieces/15 pieces in all
Name of construction work
Coal unloading pier, Hitachinaka
Client
J-POWER
Purpose/Function
Quay wall (-19 m)
Year completed
2000
Dimensions (m)
Length = 25.0, width = 32.0, height = 25.0
Quantity (/case)
Dead weight = 2560 tons
Design overview
Installation water depth: -20.5 m
Features
More economical than pile foundation type when the seabed ground is stronger
Remarks
Mounting type (gravity type) without piling