PROBLEM TO BE SOLVED: To provide a crane that can increase rigidity of the crane in a container loading work and lengthen an intrinsic period of the crane at the time of occurence of an earthquake.SOLUTION: An upper portal tie beam 4 is erected between a sea-side leg 2 and a land-side leg 3. Below the upper portal tie beam 4, a lower portal tie beam 5 is liftably arranged and at the sea-side leg 2 and the land-side leg 3, lifting apparatuses that lift the lower portal tie beam 5 are installed. Between the upper portal tie beam 4 and the lower portal tie beam 5, diagonal members 6 and 7 are arranged in a V or X shape. At the time of occurence of an earthquake, the lower portal tie beams 5 are lifted upward by the lifting apparatuses, and successively the diagonal members 6 and 7 are folded back in a X shape with upper supporting points 13 thereof as shafts.

    【課題】コンテナの荷役時にクレーンの剛性を高くする一方、地震発生時にクレーンの固有周期を長くすることができるクレーンを提供する。【解決手段】海脚2と陸脚3の間に上部ポータルタイビーム4を架設し、該上部ポータルタイビーム4の下方に下部ポータルタイビーム5を昇降自在に配置すると共に、前記海脚2と前記陸脚3に前記下部ポータルタイビーム5を昇降させる昇降装置を設置し、前記上部ポータルタイビーム4と前記下部ポータルタイビーム5の間に斜材6,7をV又はX字状に配置し、地震発生時に、前記下部ポータルタイビーム5を前記昇降装置によって上方に持ち上げるのに追随して、前記斜材6,7を、その上支点13を軸にしてX字状に折り畳む。【選択図】図9


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    Title :

    CRANE


    Additional title:

    クレーン


    Contributors:

    Publication date :

    2015-11-05


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66C Krane , CRANES



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