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Pneumatic Caisson
Full Automatic Pneumatic Caisson Method
New DREAM is a 100% un-manned construction system which evolved from a pneumatic caisson method. This System consists of ;
1) Excavation machinery maintenance lock by double slabs,
2) High performance caisson excavation machinery,
3) Elevator under normal pressure,
4) Large man lock above operation chamber,
5) DHENOX (*) inhalation system in an emergency case.
(*) Helium/Oxygen/Nitrogen Oxide mixed gas
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.

Superiorities to Conventional Pneumatic Caisson:
1) Safety
2) No worker in pressurized chamber or improved working environment
3) Excavation cost reduction by 10%
4) Sharp reduction in construction time
5) The deeper excavation, the more cost and time savings
New DREAM System
New DREAM System
Conventional Method New DREAM Method
Conventional Method New DREAM Method
Comparative Photos of Excavation Chambers; Conventional & "New DREAM Method"
Major REcords by Pneumatic Caisson Method
Rainbow Bridge Foundation Shiratori Great Bridge Foundation
Rainbow Bridge Foundation (1990) Shiratori Great Bridge Foundation (1993)
Mabuchi River Bridge Foundation Arakawa Pump Station
Mabuchi River Bridge Foundation (1999) Arakawa Pump Station (2003)
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