| 摘要 |
PURPOSE:To facilitate work so as to reduce the cost by connecting a center fold-type auxiliary jib successively in line with a point end of a jib supported onto a frame and distributively mounting a concrete distributing feed pipe along each member to the point end of the auxiliary jib from the bottom end of the frame. CONSTITUTION:A center fold-type auxiliary jib 5 is connected, being able to bend in its base end part in a plane with the lengthwise direction axis existing, successively in line with the point end of a jib 1 being able to perform turning and elevation on a jib supporting frame 2. Next the auxiliary jib 5 hangs down its point end by a wire 4 mounted to the point end of the jib 1. Subsequently, concrete distributing feed pipes 2a, 1a, 5a, 5a are distributively mounted along the lengthwise direction of each constitutional part from the bottom end of the supporting frame 2 to the point end of the auxiliary jib 5. Concrete is forced to be press fed to a hose 7 in the point end of the auxiliary jib 5 from a pump vehicle 8 via a connection steel pipe 9 and the distributing feed pipes 2a, 1a, 5a, 5a.
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