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Coastal structures

Jackets (breakwaters, wave dissipaters)

Jackets consist of the leg of three-dimensional truss structures made up of steel pipes and a pile driven therein, which are fixed to the ground of the seabed and combined using welding or grout. A steel pipe truss simultaneously helps to increase rigidity and rationally distribute loads to the foundation piles. Jackets can be manufactured in a plant and erected as large-size blocks through single operation, so it is possible to achieve high-quality and a reduced construction period. Jackets have been adopted for many piers and quays, and today, an increasing number of breakwaters using jackets are being applied at locations where caissons are difficult to construct, such as deep waters and soft seabed ground. In addition, if the seabed ground is strong enough, mounting type (gravity type) breakwaters of frame hybrid structure, for which piling is not required, can also be applied.

Construction examples

Name of construction work
Breakwater jacket manufacturing work in Aoura Fishery Harbor
Client
Nagasaki Prefecture
Purpose/Function
Breakwater
Year completed
2010
Dimensions (m)
24.8 (length) × 15.5 (width) × 21.5 (height)
Quantity (/element)
Weight of steel: 196 tons
Design overview
Installation water depth: -15.8 m
Features
Seawater exchange type
Name of construction work
Breakwater jacket manufacturing work in Kuzuwa Fishery Harbor
Client
Kagoshima Prefecture
Purpose/Function
Breakwater
Year completed
2010
Dimensions (m)
19.8 (length) × 26.2 (width) × 33.7 (height)
Quantity (/element)
Weight of steel: 245 tons
Design overview
Installation water depth: -27 m
Name of construction work
Offshore breakwater manufacturing work on Suruga-Isshiki Beach
Client
Ministry of Land, Infrastructure, Transport and Tourism Chubu Regional Development Bureau
Purpose/Function
Offshore breakwater
Year completed
2007
Dimensions (m)
49.7 (length) × 10.4 (width) × 4.2 (height)
Quantity (/element)
Weight of steel: 113 tons
Design overview
Installation water depth: -7 m, design wave height (Hmax): 4.0 m
Features
Structure intended to protect the beach from beach erosion and reduce waves
Name of construction work
Breakwater construction work in Yokosuka Port (Kurihama Zone)
Client
Yokosuka City
Purpose/Function
Wave dissipater
Year completed
1985
Dimensions (m)
30.0 (length) × 4.0 (width) (top end width) × 8.5 (height)
Quantity (/element)
Weight of steel: 48 tons/unit, concrete: 362 m3, asphalt mat: 135 m2
Design overview
Installation water depth: -5.5 m, design wave height (H1/3): 1.1 m, design coefficient kh: 0.2
Features
Mounting type hybrid structure