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    • 22. 发明授权
    • Lightweight tower crane boom for conveying pumped concrete
    • 用于输送泵送混凝土的轻型塔式起重机吊臂
    • US4712697A
    • 1987-12-15
    • US888118
    • 1986-07-22
    • Joseph L. McGowan
    • Joseph L. McGowan
    • B66C23/18E04C3/04E04C3/08E04G21/04E04H5/12
    • E04G21/04B66C23/18E04C3/08E04G21/0427E04H5/12E04C2003/0495
    • A lightweight boom supported by a rotatable jib of a tower crane for introducing flowable concrete mix to form systems has a concrete conveying conduit which functions also as a structural member of the boom, in order that the overall weight of the latter is minimized. The elongated boom has a triangular configuration in transverse cross-section, with two parallel, co-planar, spaced upper members and a hollow, concrete conveying bottom member that is generally parallel to the two upper members and spaced below the same. Horizontally extending brace members interconnect the two upper members, and spacer bars depending from the two upper members are secured to the bottom member. One aspect of the invention concerns a wheeled cart that is pivotally connected to an end portion of the boom and rests on ground level structure for supporting a portion of the weight of the boom while the jib lifts an opposite end portion of the boom to an elevated position, so that the weight and consequently the length of the boom can be increased without exceeding the carrying capacity of the tower crane. The boom is particularly adapted for tower cranes that are used to fabricate large annular concrete structures such as hyperbolic cooling towers.
    • 由塔式起重机的可旋转起重机支撑的轻型起重机,用于引入可流动的混凝土混合物以形成系统,具有也用作起重臂的结构构件的混凝土输送管道,以使后者的总重量最小化。 细长悬臂在横截面上具有三角形构造,具有两个平行的,共同平面的间隔开的上部构件和中空的混凝土输送底部构件,该构件大致平行于两个上部构件并在其下方间隔开。 水平延伸的支撑构件将两个上部构件互连,并且从两个上部构件悬挂的间隔杆固定到底部构件。 本发明的一个方面涉及一种轮式推车,其可枢转地连接到动臂的端部并且搁置在地平面结构上,用于支撑悬臂的重量的一部分,同时起重臂将悬臂的相对端部提升到升高的 从而可以在不超过塔式起重机的承载能力的情况下增加起重臂的重量和因此的长度。 起重机特别适用于用于制造大型环形混凝土结构(如双曲线冷却塔)的塔式起重机。