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Hybrid caissons and L-shaped caissons (for quay walls)

This caisson consists of a steel/concrete composite structure, which allows for longer boxlengths and footings. They can be manufactured in factories across the country and towed afloat, making them not only economical but also effective as a rapid on-site construction method.

Features of the construction method.

  1. Footings can be overhung to a large extent
  2. Lightweight, low draft, caissons can be lengthened
  3. Labor-saving concrete work
  4. Rapid on-site construction
  5. Easily adaptable to various shapes

Compared with RC construction methods
Unit length weight approx. 60%.
1.5 to 2.0 times longer

Construction examples

1.Overview

Hybrid caissons are highly economical and easy-to-construct caissons that takes advantage of the benefits of composite structure.

2.Features

Feature 1 : Footings can be extended significantly

Feature 2 : Lightweight, low draft, caisson can be lengthened

Feature 3 : Can be easily adapted to various shapes

  1. Slit
  2. Slit (No opaque area)
  3. Slit (with conduit)
  4. Double slit (with conduit)
  5. Upper slope (with conduit)
  6. Upper slope slit
  7. Horizontal slit

Structure examples of hybrid caissons

Construction examples

Project name Yokohama Port Shin-Honmoku Area Seawall (Wave Protection) Main Body Works
Client Kanto Regional Development Bureau, Ministry of Land, Infrastructure and Transport
Purpose and function Wave protection revetment
Year of construction 2021
Dimensions L20*B7(16)*H19
Number of units 4 units
Weight 2231 t/unit (with ballast)
Steel weight 200 t/unit
Concrete volume 719 m3/unit
Design overview
Features and functions
Project name Construction of Nagoya Port Kinjo Pier Quay (-12m) in 2019
Client Chubu Regional Development Bureau, Ministry of Land, Infrastructure, Transport and Tourism
Purpose and function Quay (-12m)
Year of construction 2020
Dimensions L35.0*B7.2(17.2)*H16.2
Number of units 2 units
Weight 2770 t/box
Steel weight 363 t/unit
Concrete volume 940.6 m3/box
Design overview Design depth (-12.6 m)
Features and functions
Project name New Honmoku Wharf construction work (No. 8, caisson steel shell fabrication work)
Client Yokohama City
Purpose and function Seawall
Year of construction 2020
Dimensions L25.0*B8.0 (10.5)* H13.5
Number of units 5 units
Weight 1947 t/unit
Steel weight 125 t/unit
Concrete volume
Design overview Design depth (-10 m)
Features and functions
Project name Sluice gate lower steel shell fabrication work
Client Ibaraki Prefecture
Purpose and function Lower part of sluice gate
Year of construction 2018
Dimensions L27.5*W29.5*H14.5
Number of units 1 unit
Weight
Steel weight 691 t/unit
Concrete volume
Design overview Sluice gate bed height (-6.0 m)/design seismic intensity 2.0
Features and functions Hybrid pier (sluice gate lower foundation)
Project name Ash dumping site revetment on the north side of the front of the Kinuura 1 site
Client JERA Co., Inc.
Purpose and function Waste revetment
Year of construction 2016~2018
Dimensions L90.0*B19.0*H16.2 etc.
Number of units 14 units
Weight 7900 t/unit, etc.
Steel weight 1175 t/unit
Concrete volume
Design overview Design depth (-13 m) / Design seismic intensity 0.19
Features and functions
Project name Ukishima 2nd phase waste landfill C revetment caisson fabrication works
Client Kawasaki City
Purpose and function Wave dissipation and waste landfill perimeter revetment
Year of construction 2013
Dimensions Length 20.0 x Width 8.0/16.0 x Height 15.0 m
Number of units 24 units
Weight  1,868 t/unit
Steel weight 62~130 t/unit
Concrete volume 512-563 m3/unit
Design overview Installation water depth -12.0 m, design seismic intensity 0.22
Features and functions Long footing (overhang length 5.5 m)
Project name Kamaishi Harbour Mouth Area Bay Mouth Breakwater (Disaster Recovery) Main body of work
Client Ministry of Land, Infrastructure and Transport Tohoku Regional Development Bureau
Purpose and function Breakwater at the mouth of the bay (restoration)
Year of construction 2012
Dimensions Length 50.0*Width20.3/22.5*Height 19.5 m
Number of units 2 units
Weight 7,603 t/unit
Steel weight 865 t/unit
Concrete volume 2,474 m3/unit
Design overview Installation depth -16.5 m, design wave height (H1/3) 7.3 m, design seismic intensity 0.20
Features and functions Marine dock fabrication (Draft 7.2 m)
Project name Gamagori Quay Construction for the Port of Mikawa Rehabilitation Project
Client Aichi Prefecture
Purpose and function Wave Absorbing Quay (-11 m)
Year of construction 2011
Dimensions Length 50.0*Width 14.7*Height 13.5 m
Number of units 3 units
Weight 3,878 t/unit
Steel weight 310 t/unit
Concrete volume 1,145 m3/unit
Design overview Installation depth -11.5 m, design seismic intensity 0.17
Features and functions Long caisson, offshore dock fabrication (draft 7.8 m)
Project name Port of Kinuura No. 3 waste final disposal site development project revetment works
Client Aichi Rinkai Environmental Improvement Centre
Purpose and function Seawall within waste landfill
Year of construction 2010
Dimensions Length 90.0*Width 15.0*Height 17.5 m
Number of units 9 units
Weight 6,067 t/unit
Steel weight 944~1061 t/unit
Concrete volume 1,809~1,942 m3/unit
Design overview Installation depth -14.0 m, design seismic intensity 0.12
Features and functions Long caisson, offshore dock fabrication (draft 5.0 m)
Project name Tsuruga Power Station Units 3 and 4 Breakwaters, Seawall Installation and Other Works
Client The Japan Atomic Power Company
Purpose and function Upper sloping discharge embankment
Year of construction 2007
Dimensions Length 62.4*Width 15.5*Height 17.5 m
Number of units 2 units
Weight 7,990 t/unit
Steel weight 1177~1255 t/unit
Concrete volume 2,364~2,492 m3/unit
Design overview Installation depth -15.5 m, design wave height (H1/3) 9.78 m
Features and functions With water discharge pipe (φ2300), offshore dock fabrication (draft7.0 m)
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