Pneumatic Caissons
Pneumatic Caisson Method Bridge Substructures
Rainbow Bridge, Tokyo
Rainbow Bridge, double-deck bridge, well known as a touristic site especially for its beautiful appearance lighted up in the night, has an overall length of 798 meters and inaugurated in August, 1993. The foundations of the bridge were constructed by pneumatic caisson method. The dimensions of the anchorages of the pneumatic caissons are 45.1 m wide, 70.1 m long and 51.0 m high, which was the then world's largest.
Meiko Triton Bridges, Aichi Prefecture.
The three cable-stayed bridges over part of the Port of Nagoya, "Meiko Higashi Grand Bridge", "Meiko Chuo Grand Bridge" and "Meiko Nishi Grand Bridge", are collectively and familiarly called the "Meiko Triton". The foundations of the three bridges were constructed by the pneumatic caisson method and featured the first utilization of helium-mixed gas for deep underground in Japan.
Youngjong Grand Bridge, Korea
This double-deck suspension bridge for railways and traffic roads is the landmark as the gate into Seoul from Incheon International Airport. The foundations for the two main towers were constructed by the pneumatic caisson method.
Pneumatic Caisson Method Sewage Pump Facilities
Higasi-Ogu Sewage Facilities, Tokyo
These sewage pump facilities are for treatment of sewage and rain water to be discharged to the Sumida River. The facilities feature the design in harmony with the landscape including the adjacent park. The pneumatic caisson is 62.1 m wide, 77.9 m long and 41 m deep under the ground level. This is the world's largest pneumatic caisson.
Pneumatic Caisson Method Departure/Arrival Shafts for Shield Tunnels
Sanra Shaft by Pneumatic Caisson, Osaka Prefecture.
The district of Neyagawa extends on low and plain lands and rain water there does not easily flow into the rivers. This causes often floods. As one of the countermeasures for the flooding, there is being constructed the underdrain structure, from 30 to 50 m deep and 11.4 km long. The underdrain has six (6) shafts of which the one located at the most upper stream was constructed of a pneumatic caisson.
Pneumatic Caisson Method Railway/Road Tunnels
Omiya Expressway East-West Connection Tunnel by Pneumatic Caisson, Saitama Prefecture.
At the complicated crossing point of the four important transportation routes, the Omiya Line of Tokyo Metropolitan Expressway, Tohoku-Jyoetsu Shinkansen High-Speed Railway, Saikyo Line of Japan Railways East Japan and the freighter train line, the traffic tunnel was constructed by sinking six pneumatic caissons consecutively. Our advanced technology made it possible to construct the tunnel in the compact and narrow area of many important adjacent structures.
