Tobiuo Bridge, Japan

The five-span four-lane Tobiuo Bridge is part of a beltway surrounding the city of Hamamatsu, Shizuoka Prefecture that provided a principal access route to the Pacific Flora 2004, Shizuoka International Garden and Horticulture Exhibition in 2004. The bridge was named after a legendary swimmer from Hamamatsu, nicknamed "- fujiyama no tobiuo" (flying fish of the country of Mt.Fuji), as suggested by the public.

The bridge spans are 38.5-45.0-90-130-80.5 m, total length is 386 m, total width is 25.8 m. The structure is carried by two sets of eight parallel DYWIDAG extradosed cables type VC 37 x 0.6" in a single central plane, with two pylons made of structural steel on the main piers, height - only - 13 m.

The pylons including preinstalled cable saddles are assembled in a factory in two parts, for ease of transportation to the construction site.

The cable strands are provided with three layers of corrosion protection. They are epoxycoated (FLO-BOND), placed in polyethylene pipes and cement-grouted after tensioning.

Four 2,500 t bearings are installed above the main piers as bearings to distribute lateral forces during an earthquake. Seismic isolation systems are installed for all sets of stay cables. High-performance dampers were chosen for the extradosed cables because the erection site is subject to extremely strong monsoon winds during winter.

SupplyRental of stressing equipment

Hamamatsu Public Engineering Office, Shizuoka prefectural government, Japan

Kajima Corporation, Sumitomo Mitsui Construction Co., Ltd., both Japan (superstructure only)