| Home > R & D and Technologies > Pneumatic Caisson
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New DREAM is a 100% un-manned construction system which evolved from a pneumatic caisson method. This System consists of ; |
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1) |
Excavation machinery maintenance lock by double slabs, |
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2) |
High performance caisson excavation machinery, |
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3) |
Elevator under normal pressure, |
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4) |
Large man lock above operation chamber, |
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DHENOX (*) inhalation system in an emergency case. |
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(*) Helium/Oxygen/Nitrogen Oxide mixed gas |
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The above 5 items are adjusted and combined depending on operation conditions. Operation by workers under pressurized conditions, dangers due to excavation & settlement, maintenance & repair of excavator, assembly & collection of machinery, and measurement of ground bearing capacity is completely replaced by un-manned remote operation.
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Superiorities to Conventional Pneumatic Caisson: |
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1) |
Safety |
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2) |
No worker in pressurized chamber or improved working environment |
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3) |
Excavation cost reduction by 10% |
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4) |
Sharp reduction in construction time |
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The deeper excavation, the more cost and time savings |
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| New DREAM System |
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| Conventional Method |
New DREAM Method |
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| Comparative Photos of Excavation Chambers; Conventional & "New
DREAM Method" |
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| Rainbow Bridge Foundation (1990) |
Shiratori Great Bridge Foundation (1993) |
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| Mabuchi River Bridge Foundation (1999) |
Arakawa Pump Station (2003) |
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