To reduce the burden on a worker required for installing and removing a jib side support rope and a boom side support rope.SOLUTION: A crane 100 comprises a jib posture holding device 8 for holding a jib 6 in a forward inclined posture with respect to a boom 5. The jib posture holding device 8 includes a jib mast 26 for holding a rope connection part 24 at a mounting position backwardly separated from a jib base end part 17 and a boom tip part 15 such that each of a jib side support rope 22 and a boom side support rope 23 is linearly stretched when the jib 6 takes the forward inclined posture. The jib mast 26 is configured to take a stretching mode at which the rope connection part 24 is held at the stretching position in a standing posture and a loosening allowable mode at which the rope connection part 24 is arranged at a loosening allowable position which is closer to the boom tip part 15 and the jib base end part 17 than the stretching position and allows the loosening of the jib side support rope 22 and the boom side support rope 23 .SELECTED DRAWING: Figure 2

    【課題】ジブ側支持ロープ及びブーム側支持ロープの架設及び取り外しにかかる作業者の負担を軽減する。【解決手段】クレーン100は、ジブ6をブーム5に対して前傾姿勢で保持するジブ姿勢保持装置8を備え、ジブ姿勢保持装置8は、ジブ6が前記前傾姿勢を取るときにジブ側支持ロープ22及びブーム側支持ロープ23の各々が直線的に張る程度にジブ基端部17及びブーム先端部15から背後へ離れた張設位置にロープ連結部24を保持するジブマスト26を有し、ジブマスト26は、起立姿勢にてロープ連結部24を前記張設位置に保持する張設形態と、前記張設位置よりもブーム先端部15及びジブ基端部17に近い位置であってジブ側支持ロープ22及びブーム側支持ロープ23が弛むのを許容する位置である弛緩許容位置にロープ連結部24を配置する弛緩許容形態とを取り得るように構成されている。【選択図】図2


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    Title :

    CRANE AND ASSEMBLING METHOD AND DISASSEMBLING METHOD OF CRANE


    Additional title:

    クレーン、クレーンの組立方法及び分解方法


    Contributors:

    Publication date :

    2022-05-02


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66C Krane , CRANES



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