Steel caissons, L-shaped caissons
(for land reclamation and partition of revetment)
Steel caissons are caissons with steel members for the outer walls and bulkheads and SRC or steel members for the bottom plate. They are excellent for mid-partition revetments where long-term corrosion protection is not required, in terms of economy and rapid construction.
Features of the construction method
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The small amount of concrete used means that the weight of the caisson can be reduced,making it lighter and longer.
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The amount of concrete work is small, shortening the fabrication work.
Pneumatic Caisson Method (Overview of Constructin Method)
In this method, a caisson is sunk into the ground or sea while excavating soil and sand from the bottom of the caisson, which is constructed on the ground when constructing a shaft or pier foundation.
（The caisson is excavated and discharged without groundwater infiltration by sending high-pressure air into the working chamber at the bottom of the caisson.)
Pneumatic Caisson Method (Construction Examples)
Construction examples
| Name of construction work | Steel caisson fabrication for Sumida River Bridge, Loop No. 2 |
|---|---|
| Client | Tokyo Metropolitan Government |
| Purpose/function | Pier foundation |
| Year of construction | 2012 |
| Dimensions | Length 39.0 x Width 10.0 x Height 11.0 m |
| Number of units | 1 unit |
| Weight | ― |
| Steel weight | 300 t/unit |
| Concrete volume | 215 m3 inside the blade |
| Design overview | Installation depth -4.0 m |
| Features/functions | Working chamber 868 m3 |
| Name of construction work | Fushiki Toyama Port (Shin-Minato area) Road (East-West Line)Bridge (P22) Foundation works |
|---|---|
| Client | Hokuriku Regional Development Bureau, Ministry of Land, Infrastructure and Transport |
| Purpose/function | Bridge pier foundation |
| Year of construction | 2004 |
| Dimensions | Length 29.0 x Width 13.0 x Height 11.5 m |
| Number of units | 1 unit |
| Weight | ― |
| Steel weight | 400 t/unit |
| Concrete volume | 889 m3inside the blade |
| Design overview | Installation depth -47.0 m |
| Features/functions | Working chamber 704 m3 |
| Name of construction work | Temporary seawall fabrication for Naoetsu Port, West side |
|---|---|
| Client | Niigata Prefecture |
| Purpose/function | Temporary Seawall |
| Year of construction | 1999 |
| Dimensions | Length 74.8 x Width 5.2/7.2 x Height 6.5 m |
| Number of units | 1 unit |
| Weight | 843 t/unit |
| Steel weight | 215 t/unit |
| Concrete volume | 344 m3/unit |
| Design overview | Installation depth -5.0 m |
| Features/functions | ー |