Reason for selection: “The Connecting Bridges for the Sumida River Terrace (over the Oshima Tributary
and the Tsukishima Tributary) are structures whose main parts are made
with duplex stainless steel and the spans of approx. 40 and 50 meters make
them the longest stainless steel bridges in the country. There are only
two other projects in Japan, where duplex stainless has been used for such
application.
Harmony with the surrounding scenery is considered in the design and in
order to have the shape of the bridges remind people of “yakatabune” or
nostalgic roofed pleasure boats, unique techniques were used - welding
the sections of the main girders outdoors, for example.
At the time of installation, taking into account that duplex stainless
steel is characteristically hard and difficult to correct, special attention
was paid to minimize the heat distortion at welding and also calculating
the spring back due to intense processing, caution was exercised when bending
the corners of the ground-covering sections.
Duplex stainless steel lightens the burdens associated with such future
maintenance work as repainting the bridges and significantly contributes
to slashing the life cycle costs.Other advantages
offered by having installed these large bridges include expanded mobility of
vessels around the entrance of the Sumida River and the creation of new
waterfront urban scenery to integrate with nearby buildings and structures.
Stainless steel types used: SUS821L1
Consumption: 200,000 kg (total of the two bridges)
