CPC E04G 21/0445 (2013.01) [E04G 21/0436 (2013.01); Y10T 137/8807 (2015.04)] | 12 Claims |
1. A concrete-pump boom-arm segment having an upper chord (33), a lower chord (34) and two side-parts (35, 36), which connect the upper chord (33) and the lower chord (34), and having a longitudinal joint (44) between two subregions (41, 42) of the boom-arm segment which adjoin one another in a longitudinal direction, wherein the longitudinal joint (44) extends over upper chord portions (56, 66) and over first side-part portions (53, 63), wherein the first side-part portions (53, 63) are bent over with respect to the upper chord portions (56, 66) in the first subregion (41) and in the second subregion (42), and wherein a material thickness of the upper chord portion (56) in the first subregion (41) is greater than a material thickness of the upper chord portion (66) in the second subregion (42), and having four reinforcing plates (46, 47), which extend across the same longitudinal joint (44), wherein two of the reinforcing plates (47) overlap with the first side-part portions (53, 63) that are bent over with respect to the upper chord portions (56, 66) and two of the reinforcing plates (46) overlap with second side-part portions (54, 64) which are bent over with respect to lower chord portions (52, 62) of the first and second subregions (41, 42), respectively, each of the four reinforcing plates (46, 47) is arranged close to a respective edge of one of the upper or lower chords (33, 34), and a distance from each reinforcing plate (46, 47) to the respective edge increases with increasing distance from the longitudinal joint.
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