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  4. Vol.32 No.110 2008.3


Vol.32 No.110 2008.3


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

【巻頭言】Prefatory note

  • 「現場力」に思う

    Thinking of “Genbaryoku” (Capabilities in Workplace)


    Chikao Ito

【特集号コラム】Column for special issue

  • 明石海峡大橋10周年、瀬戸大橋20周年特集号について

    Special Issue of Akashi-Kaikyo Bridge 10th and Seto-Ohashi Bridges 20th Anniversaries


    Kunihisa Mori

  • 本四高速道路の維持管理

    Maintenance of Honshu-Shikoku Bridge Expressway


    Tokunari Mori

  • 明石海峡大橋の維持管理

    Maintenance of Akashi Kaikyo Bridge


    Kiyotaka Niki

  • 大鳴門橋の維持管理

    Maintenance of Ohnaruto Bridge


    Hiroaki Hoashi

  • 瀬戸大橋の維持管理

    Maintenance of Seto-Ohashi Bridges


    Yasuomi Okamoto

【技術論文】Technical report

  • 本四高速道路の保全管理 概要

    Maintenance of Honshu-Shikoku Bridge Expressway


    Tomiharu Iwagaki, Haruhiko Kono



    Honshu-Shikoku Bridges are large scale structures and located in the Seto Inland Sea which is an area under severe weather condition. Generally, it is very difficult to keep the structures in good conditions under such a situation and to save maintenance cost, if conventional maintenance methods are applied. Therefore, innovative maintenance concepts should be adopted to ensure the safety of the structures.

    This paper describes the basic concepts of the maintenance and inspections for Honshu-Shikoku Bridge Expressway.

  • 本四高速道路の防災管理

    Disaster prevention management of Honshu-Shikoku Bridge Expressway


    Takeshi Takeno, Yoshiya Sakamoto


    Since Honshu-Shikoku Bridge Expressway Company Limited was established as a public corporation, disaster prevention work has been incessantly executing. This paper shows the system of the disaster prevention works and also explains the outlines of them such as the past main disaster histories of each route in service, improving process of weather forecast, recent problems and newly developed technology.

  • 本四高速道路の交通管理

    Traffic management of Honshu-Shikoku Bridge Expressway


    Kazuyuki Ishihara, Yoshiya Sakamoto


    About ten years, twenty years and nine years have passed since Akashi Kaikyo Bridge, Seto-Ohashi Bridges and Kurushima Kaikyo Bridges were completed respectively. Traffic management is one of important services to the customers for using Honshu-Shikoku Bridge Expressway safely, securely and comfortably. This paper introduces the summary of traffic management since 1999 after the opening of three Expressways.

  • 本四連絡橋の動態観測

    Structural Health Monitoring System for the Honshu-Shikoku Bridges


    Shigeki Kusuhara, Chihiro Kawatoh


    In order to verify the design assumption and to be utilized for the maintenance, the health monitoring system, (such as seismometer, accelerometer, anemometer, thermometer, GPS), has been installed to the Honshu-Shikoku Bridges (HSB). After the completion, the HSB were attacked by several typhoons and earthquakes. The external force, i.e., wind velocity or earthquake motions, and the response of the bridge structure were recorded during such severe conditions. The structural analyses were carried out and the structural responses were compared with the recorded response. Based on the analyses of the observed data, it was confirmed that the assumption during the design stage was appropriate.

  • 吊橋ケーブルバンドの維持管理

    Maintenance of Cable Bands on Suspension Bridges


    Ikuo Yamada, Akira Moriyama


    The slip safety of cable bands and the maintenance method for band bolts are reviewed after completion of suspension bridges, considering the axial forces of band bolts and the tensile forces of suspender ropes. This paper mainly describes the maintenance of cable bands on the Ohnaruto Bridge.

  • 本四連絡橋のケーブル振動と制振対策

    Cable Vibrations and Countermeasures for Honshu-Shikoku Bridges


    Ikuo Yamada, Shigeki Kusuhara, Kouichiro Fumoto


    Polyethylene-covered (PE) parallel wire strands (PWS) are used for cable systems of the long-span bridges to reduce maintenance cost, and are likely to be excited by wind. Therefore, countermeasures for cable vibrations were investigated and applied to each bridge in the Honshu-Shikoku Bridges. This paper describes a brief review of vibrations and countermeasures for cable systems on the Honshu-Shikoku Bridges.

  • 本四連絡橋の防食

    Corrosion Protection of Honshu-Shikoku Bridges


    Kazuyoshi Sakai, Shoko Kikuchi


    Various corrosion protection methods are applied to maintaining Honshu-Shikoku Bridges perfectly more than 200 years. Here we introduce corrosion protection methods: dry-air injection system for main cable, non-destructive inspection, repainting and partial replacement method for suspender rope, repair of local corrosion on stiffening truss, electro deposit method for steel caisson corrosion, protection for multi-column foundation and corrosion protection for other accessories.

  • 本四連絡橋の塗替塗装

    Repainting of the Honshu-Shikoku Bridges


    Yukio Nagao



    Repainting area of long-span bridges such as suspension bridges and cable stayed bridges crossing the straits amounts to about 4,000,000 m2. Of the maintenance budget large cost is required to carry out repainting, and to reduce repainting cost is the top priority for saving the budget. In addition, conducting repainting work is indispensable to keeping the long-span bridges in good conditions.

    This paper describes the concept of the repainting for long-span bridges and the development of the execution techniques.

  • コンクリート構造物の維持管理

    Maintenance of concrete structures


    Yukio Nagao




    About 9 years to 27 years have passed since each section of Honshu-Shikoku Bridges was completed. Severe damage has not been found yet and large scale repair works have never been carried out. However, it is anticipated that the Bridges are subject to severe salt damage because they are located under the influence on sea water splash or flying salinity.

    For the maintenance of concrete structures in Honshu-Shikoku Bridges, non-destructive tests have been conducted during periodic inspections. And the concept of preventive maintenance has been applied to ensure long life of the structures more than 200 years and to save life cycle cost of them.

    This paper shows the outline of the non-destructive tests applied for the maintenance of long-span bridges and the results.

  • 本四連絡橋橋梁付属物の維持管理

    Maintenance for accessories of Honshu-Shikoku Bridges


    Kazuaki Mukohara


    Seto-Ohashi Bridges and Akashi Kaikyo Bridge will mark the 20th and 10th anniversaries on April 10th and April 5th, 2008, respectively. Some problems which are caused by the initial defects have been found so far. Main problems were the noise and inclination of link type expansion joints, the noise of rolling leaf type expansion joints, the noise of end links of Shimotsui-Seto Bridge, the rust of bearings of orthotropic steel deck and the damage of rubber buffer system against ship collision. This report shows the maintenance for those bridge accessories.

  • 本四連絡橋の疲労設計

    Fatigue Design on Honshu-Shikoku Bridges


    Akira Moriyama, Yokoi Yoshiteru, Kazunori Tako

    本四連絡橋の疲労検討は、道路鉄道併用橋の補剛トラス部材へ適用する調質高張力鋼の疲労設計から始まり、大型疲労試験機による各種疲労試験を実施、その成果は設計基準および製作基準等へ反映されてきた。その後、他機関の道路橋において疲労損傷が報告されるようになり、疲労耐久性の向上を目的に検討を実施し、その成果を建設へ反映してきた。ここでは、本四連絡橋における疲労設計の経緯を紹介するとともに、道路鉄道併用橋の管理にいたる取組みと管理において実施した追跡調査の概要を報告する。 さらに、疲労に対する構造物の安全性確保と点検業務の効率化を目指した検討について報告する。

    In Honshu-Shikoku Bridges, the fatigue tests that large-sized specimen were used were conducted to obtain the characteristic of fatigue. The test results were applied to the design criteria and the fabrication standard. This paper describes development process of the fatigue design in Honshu-Shikoku Bridges, and it reports studies that are aimed at ensuring the safety of the structure for fatigue damage and the improving the efficiency of the inspection.

  • 本四連絡橋の耐震補強

    Seismic Upgrading for the Honshu-Shikoku Bridges


    Susumu Fukunaga, Tatsuo Okazwa, Yoshimi Hasegawa


    After the 1995 Great Hanshin Earthquake, the effects of the inland near field earthquake with the magnitude of about 7, which causes great impacts on highway bridges, have been considered in the design. In March 2005, "Promotion of seismic upgrading for highway bridges and bullet train bridges" were announced and the seismic upgrading for bridges in highways for emergency transportation and bullet train railways has been started. Considering these circumstances, HSBE has been executing seismic performance verification and seismic upgrading works. This paper presents the concept of seismic upgrading, study of applied seismic motions, results of seismic performance verification and examples of seismic upgrading works.

  • 鋼床版舗装の維持管理

    Maintenance of pavement on steel plate deck


    Yosuke Yokonuma



    Micro-Surfacing (MS) method is adopted for the repair of the pavement on steel plate deck of long-span bridges in view of conducting preventive maintenance.

    This paper reports histories of maintenance for the pavement on steel plate deck by MS-method and routine measure of the pavement maintenance such as repair of crack.

  • 陸上部舗装の維持管理

    Maintenance of pavement on the land section


    Yasuhiro Yano


    Road surface is the most influential part of highway for drivers; therefore it is a crucial issue to service drivers with safe and comfortable pavement surface consistently. To maintain and repair the pavement on the land section in Honshu-Shikoku Bridge Expressway, the conditions of pavement surface are investigated through daily inspection and configuration inspection for the surface first, and then considering the inspection results, some are repaired immediately and others are repaired according to the yearly plan set up.

    This paper reports the maintenance and repair results of the pavement on the land section and a current to the repair of pavement in the future.

  • 機械設備の維持管理と開発

    Management and Development of Road Maintenance Equipment for Honshu-Shikoku Bridge Expressway


    Yoshihiro Asakura, Akira Kagawa, Yoshiji Oura



    Road maintenance equipment for highways and bridges has been installed for the safety, rest and comfort in the Honshu-Shikoku Bridge Expressway. There are many facilities which are peculiar to the Expressway among the equipment. Under these circumstances, maintenance preventions have been carried out during the plan, design and installation of the facilities, considering past useful maintenance experiences. In addition, corrective maintenance has been conducted through actual maintenance works. On the other hand, some machines have been developed for conducting effective maintenance.

    This paper reports the outlines and histories of the machinery peculiar to the Expressway, and also shows the developments and future approaches of the working equipment.

  • 電気通信設備の変遷

    History of telecommunications facilities


    Kunio Nakashima, Shigeyuki Murakami, Shinji Nishino



    The first traffic management system in HSBE was established for Ohmishima Bridge section in May, 1979. After that, the systems had been expanded one after another and operated for each section of the expressways which were completed. During structuring the systems, the technologies of telecommunications and remote monitoring & control were required to be applied because the facilities of the traffic control center were set apart from the facilities on the expressways. In addition, the various technologies of information processing were needed to be installed in the system because a large amount of information was managed in real-time. Furthermore, during the expansion of the systems, the different technologies were used for each completed section of the expressways because the latest technologies at that time were utilized when each section of the expressway was opened.

    This paper describes unique technologies of the traffic management systems in Honshu Shikoku Bridge Expressways and the histories.

【技術ニュース】Technical news