| 摘要 |
PROBLEM TO BE SOLVED: To facilitate lifetime estimation of an oscillation pipe of a concrete pump. SOLUTION: Two suction and delivery outlets 2a, 2b are provided side by side in a right and left direction at a front side wall 1a of a hopper 1, and two cylinders 3 for pumping is made communicate to the two suction and delivery outlets 2a, 2b. The oscillation pipe 6 as an oscillation valve bent in S-shape is stored in the hopper 1. The oscillation pipe 6 is constructed in such a manner that the same can be connected to a concrete transport pipe 10 at rear end part and that a front end thereof can oscillate in the right and left direction to alternately coincide with the two suction and delivery outlets 2a, 2b. A hole 24 of a predetermined depth is provided on a pipe wall at an upper bend part in a vertical direction from an outside to enable estimation of lifetime of the oscillation pipe 6, and thickness dimension between an inner bottom part of the hole 24 and an inner surface of the pipe wall is set slightly smaller than wall thickness dimension of the pipe wall at a bend part of a lower part. COPYRIGHT: (C)2009,JPO&INPIT
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