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  4. Vol.21 No.81 1997.1


Vol.21 No.81 1997.1


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

【巻頭言】Prefatory note

  • ISO9000との出会い

    Encounter with ISO 9000


    Mitsuharu Hinonishi

【技術論文】Technical report

  • 明石海峡大橋アンカレイジの上屋計画

    Plan on Anchorage Chambering for Akashi Kaikyo Bridge


    Gouhei Tokunaga, Kazuyuki Ishihara



    The anchorage chamber might be a weak point in maintenance, since the cable wires are unprotected inside the chamber and the water tends to leak through the roof. Therefore, the chamber should be carefully designed to protect structural members inside. However, the configuration of chamber cannot be standardized due to structural peculiarity of each suspension bridge. Hence, there might be a chance to occur less consideration to such a weak point with the chamber design. This paper introduces the design of chamber for Akashi Kaikyo Bridge that reflected results of studies on requirements in design from a viewpoint of maintenance.

  • 明石海峡大橋船舶緩衝工の設計

    Design of Shock-Absorbing Device of Akashi Kaikyo Bridge for Ship Collision


    Hiroaki Hoashi, Takashige Taniguchi


    The Akashi Strait features navigation routes for both international and domestic ships, as well as fishing spots for commercial small boats. Since the foundations of tower piers of the Akashi Kaikyo Bridge locate in this strait, it is expected that the ships collide with the piers from all the directions. Hence, the piers employed a shock-absorbing structure around the circumferences of foundations to mitigate impact and damage on ships themselves in collision. This paper introduces the outline of design on the steel multi-cell structure installed on the Akashi Kaikyo Bridge.

  • 舞子高架橋ケーソン基礎の施工

    Report on Maiko Viaduct Caisson Foundation Work


    lkuo Yamada, Naohito Nishino, Shoji Ogo


    The Maiko Viaduct features an 8-span continuous PC box girder of rigid frame type with piers, which is being constructed on the Kobe side to connect 1A anchorage of the Akashi Kaikyo Bridge with the Maiko Tunnel. The viaduct is to pass through the residential area of Higashi -Maikocho District, crossing over the national highway No. 2, the prefecture-owned Maiko Park, the JR Sanyo Line, and the Sanyo Dentetsu Line. The press-down open caisson was adopted to the foundations of the viaduct, so that the construction work needs less work space, and brings about less annoyance to the vicinity. This paper reports the summary of construction work on the press-down open caisson method.

  • 下津井瀬戸大橋A3エンドリンク補修工事報告

    Report of Rennovation Work for Shimotsui-Seto Bridge A3 End Link Bearing


    Teizo Ikeda, Osamu Nakanishi


    The Shimotsui-Seto Bridge has four sets of the end link bearings with pivot structure at both ends of stiffening girder, which bears a vertical reaction force from the girder. After the high frequency noise was observed from the cause and a countermeasure. As a result, the two sets of end link, which made a lauder noise, were improved with the supplement lubricant injection method. This report introduces the renovation work on the end link, including procedure of work for boring and lubricant injection, as well as effects of work.

  • 多々羅大橋主塔架設系の風洞試験

    Wind Tunnel Test on Pylons of Tatara Bridge in Erection Phase


    Nobuyuki Hirahara, Akira Moriyama


    The aerodynamic stability of the pylons of Tatara Bridge during erection phase was studied by the wind tunnel test, because the aerodynamic response seemed to be greatly different from that in the completed phase: the restraint effect by the cables cannot be expected and vibration characteristics are altered according to the phase of erection. As a result, aerodynamic stability during the erection phase was excellent and no harmful vibration was observed. The test clarified that this stability was brought about by the damping due to the erection machinery.

【海外報告】Overseas report

  • アジアの橋梁の現状

    Present situation on Asian bridge stocks


    Sumitaka Kurino

  • インドネシアの吊橋

    The suspension bridges in Indonesia


    Tsuyoshi Matsumoto

【技術ニュース】Technical news