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DREAM for Bridge for Tokyo Bay Area
Completion Image Photo (Copyright(C) Construction Office 5, Tokyo Metropolitan Government)
Completion Image Photo (Copyright(C) Construction Office 5, Tokyo Metropolitan Government)
2 operators in a quiet room manipulate knobs to control excavators fixed on the ceiling of excavation chamber watching respective monitoring screens. Another screen shows detailed information of air conditions such as atmospheric pressure and gas content in the pressurized excavation chamber where underground water seepage is controlled.


When the excavation bucket becomes full with material, the operator sends a signal to the crane operator who hoists the bucket and discharges the material on a stand-by truck. When the truck becomes full with material, it moves to a barge moored 50m away and dumps the material on it. A barge transports the excavated material to a reclamation site designated by the Tokyo Metropolitan Government. No sea water contamination was found. Every step of work was carried out in order.


This construction method protects the health and safety of construction workers by eliminating the need for difficult manual labor under pressurized and confined working conditions. Also, construction time was drastically reduced. Daiho Corporation`s site representative, Mr. Kobayashi, explained that one of the

difficulties encountered during construction, was the settlement of the steel shell in the sea bottom following the installation of steel jacket which surrounds and fixes the shell. The shell is sunken step by step excavating sea bottom as mentioned above.

Outline of Project
1) Employer; The Tokyo Metropolitan Government
2) Site: Harumi 4-chome, Chuo-ku, Tokyo
3) Construction Time: December 2004 - September 2006
4) Pneumatic Caisson Foundation: 24.6m x 10.1m x 16.0m
5) Max. Theoretical Pressure: 0.296MPa
6) Work Volume:
   Excavation; 4,070m3
   Dredging; 4,820m3
   Concrete; 4,000m3
   Soil Improvement; Sand Pile; 102 psc (ø2,000mm H=2.7m)
   Replacement with Aggregate; 4,000m3
   Steel Jacket: 4 sets
Construction Flow
Construction Flow
Soil Improvement Steel Jacket Installation Steel Shell Caisson Installation
   Photo 1
     Soil Improvement
   Photo 2
     Steel Jacket Installation
   Photo 3
     Steel Shell Caisson
     Installation
Pneumatic Caisson Work Excavation in Camber Bearing Power Testing Equipment
   Photo 4
     Pneumatic Caisson Work
   Photo 5
     Excavation in Camber
   Photo 6
     Bearing Power Testing
     Equipment
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