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  4. Vol.35 No.116 2011.3


Vol.35 No.116 2011.3


* By clicking ▸ on the title of Technical Reports, abstract will be indicated.

【巻頭言】Prefatory note

  • 管理の時代に思うこと

    Expectation in the era of maintenance


    Shinichiro Ueno

【技術論文】Technical report

  • 高耐久性ふっ素樹脂塗料上塗(暫定)規格の制定

    Instituting the provisional standard on Highly Durable Fluorine Resin Paint (top coat)


    Sumitaka Kurino , Yoshiaki Yano, Toshihiro Kagoike


    Because fluorine resin paint has better weather proofing and good durability than polyurethane resin paint, it has widely adopted for top coat of new and re- paint on long span bridges since Akashi Kaikyo Bridge. The colour of paint is used as light gray for the bridges, therefore the paints contain titanium oxide as white pigment. And it has been confirmed decaying of gloss of paint caused by damage of polymer and it is estimated by photo catalysis action of titanium oxide. To improve durability of present fluorine resin paint, various proposals were drown from paint manufacturers and Highly Durable Fluorine Resin Paints have tested and a provisional standard has instituted.

  • 鋼床版裏面におけるスプレー塗装の試験施工

    Trial recoating for the back of the steel deck of the Seto-Ohashi bridges using spray-on painting


    Kenji Oya, Yasuhito Manabe, Toshihiro Kagoike


    Recoating works have been underway in Seto-Ohashi bridges since 2006. As the area to be recoated is so huge, recoating work must be carried out with high work efficiency and cost efficiency. A conventional method of brush painting has been applied to the work while it requires good workmanships and a long work period. In order to facilitate reducing the cost and time of the work, a spray-on painting method, which is hardly used for recoating of a normal size bridge, was developed and applied to a selected area of the back of the steel deck on the trial basis. This paper describes findngs obtained in the trial recoating work.

  • 吊橋ハンガーロープ素地調整装置の試験施工

    Finishing test of surface treatment machine for suspender ropes on suspension bridges


    Hideki Higashi, Shoichi Hanada, Yuki Kishi, Akira Yamane



    Surface treatment of suspender ropes on suspension bridges is usually done by workers using disk sander, and this work has needed some improvements in not only work efficiency but also working environment for scattering of dusts. To solve above tasks, we had developed the Surface Treatment Machine for Suspender Ropes and carried out its experiment and finishing test at the Innoshima Bridge. Results shows to put application of test execution to practical use.

    This report shows the state and problems of human work, system of machine, experiment and finishing test results, effects and problems of construction mechanization obtained in test, optimization of recoating of suspender ropes and application to other bridges.

  • 大島大橋における橋面舗装の変状原因調査

    Investigation for damaged pavement on Ohshima Bridge


    Tetsuya Nakamura, Kenji Ishikura



    The bridge deck pavement of the Ohshima Bridge had been deteriorated by blistering at specific parts, as more than 20 years had passed since its completion and the pavement deterioration was found to spread over wide area by detailed investigation. Therefore, the replacement of the deck pavement including mastic asphalt layer was done, whose scale was beyond our experience .

    The blistering is guessed to be taken place by various causes, such as abnormality which occurred during the construction period in lower parts (contact surface on steel deck plate) of mastic asphalt, aging of pavement surface layer and water stop work, water intrusion around partial patch works, and so on.

【海外報告】Overseas report

  • インドネシアの道路事情

    Overseas Report (Current Situation of Roads and Bridges in Indonesia)


    Osamu Tsukahara

  • ミャンマーの橋梁

    Overseas Report (Bridges in Myanmar)


    Hiroshi Takagi

【技術ニュース】Technical news