PROBLEM TO BE SOLVED: To provide a method by which a relatively long and/or relatively heavy boom can be lifted in a state that there is no necessity for enhancing a capacity in terms of a structure of a crane during the assembling work of the crane, and in which it is not necessary to easily use an auxiliary crane.SOLUTION: A hoist crane comprises: a vehicle body; a ground face engagement member for lifting the vehicle body from the ground face; a rotating floor connected to the vehicle body so as to be turnable; a boom which is pivotally attached to the rotating floor at a first end part, adjoins a second end part of the boom, and extends at a cargo lift line; a boom hoist machine which can be used for changing an angle of the boom with respect to the rotating floor during the work of the crane; and a boom lift auxiliary structure connected to the boom. It is preferable that the boom lift auxiliary structure comprises at least one ground face engagement member which contacts with the ground face, and a boom lift member which extends between the ground face engagement member of the auxiliary structure and the boom.

    【課題】クレーンの組立作業中にクレーンの構造上の能力を高める必要がない状態で比較的長く且つ/又は比較的重いブームを持ち上げることができ且つ補助クレーンが容易に利用可能であることを必要としない方法。【解決手段】巻き上げクレーンは、車体と、該車体を地面から持ち上げる地面係合部材と、車体に回転可能に結合されている回転床と、第一の端部が回転床に枢動可能に取り付けられているブームであって該ブームの第二の端部に隣接して荷吊り上げラインが延びているブームと、クレーンの作業中に回転床に対するブームの角度を変えるために使用することができるブーム巻き上げ機構と、ブームに結合されているブーム持ち上げ補助構造とを備えている。前記のブーム持ち上げ補助構造は、地面と接する少なくとも1つの地面係合部材と、該補助構造の地面係合部材とブームとの間に延びているブーム持ち上げ部材とを備えているのが好ましい。【選択図】 図1


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    Title :

    CRANE HAVING BOOM LIFT AUXILIARY STRUCTURE


    Additional title:

    ブーム持ち上げ補助構造を備えたクレーン


    Contributors:

    Publication date :

    2015-10-15


    Type of media :

    Patent


    Type of material :

    Electronic Resource


    Language :

    Japanese


    Classification :

    IPC:    B66C Krane , CRANES



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