| 摘要 |
PROBLEM TO BE SOLVED: To provide a concrete pump vehicle having a boom capable of inhibiting an inflection trouble of the boom due to the contact of boom driving means with beams during the operation of a plurality of beams.SOLUTION: A boom device B includes an inclination sensor Se (detecting means) for detecting the attitudes of beams 131-134. It further includes the third beam 133 (one beam) which is turnably connected to one end of the second beam 132 (a reference beam) and whose angle relative to the second beam 132 is increased via an auxiliary link when a second inflection cylinder (one hydraulic cylinder) is contracted from a storage attitude, and a first beam 131 (the other beam) which is turnably connected to the other end of the second beam 132 and whose angle relative to the second beam 132 is changed when a first inflection cylinder 143 (the other hydraulic cylinder) is driven. Control means C determines that one beam is foldable when its angle relative to the reference beam is a first predetermined storage angle or smaller, on the basis of the detection result of the inclination sensor Se. |
