Tokyo Infrastructure 056 Tama Ohashi Bridge

Combining mechanical rationality and beauty with high tech

A bridge over the Tama river where a red and sharp arch line is impressive. Originally there were blood vessels connecting Hachioji City and Hino City on the right bank and Akishima City and Tachikawa City on the left bank, the first Tama Bridge completed in 1966. However, following the development of the surrounding area, the traffic volume which is the can not be cleared and the second bridge, the second generation, was built due to .
It is high-tech that supports the shape of this bridge. The overall shape of the streamlined shape is decided by a punching method that determines a rational shape by extracting an unnecessary part from the solid by using an analysis technique called FEM capable of grasping the force generated in the member in three dimensions . Furthermore, by joining all the members by welding, a beautiful figure in the near future with a smooth edge passed through is created. Meanwhile, it is also attractive to see various facial expressions depending on the viewing angle, such as showing a charming look like a round open mouth from the roadway.
Design is Yasushi Ito of Pacific Consultants Co., Ltd. that continues to pursue the unity of structure and design. In addition, this bridge was awarded in 2007 for the Tanaka Prize of the Japan Society of Civil Engineers to be awarded to excellent bridges in commemoration of Yutaka Tanaka who actively adopted the new bridge format and left a great deal of achievement in the Japanese bridge world. (Nii)


Type road bridge
Location Akishima-shi Hachioji-shi Tokyo
Structural type Steel · Concrete PC floor plate steel box girder main span stiffening arch structure
Scale bridge length 461 m Maximum span length 151 m
Completion year 2011
Manager Tokyo Metropolitan Construction Bureau
Designer Pacific Consultants Co. Ltd.
Constructor Matsuo Bridge Corporation Ps Mitsubishi Corporation Iida Tsuchida Toda Construction Co. Ltd. Kumagatani corporation




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