Concrete-pump boom-arm segment having a variable sheet-metal thickness in the longitudinal direction, and method for producing such a concrete-pump boom-arm segment

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 a chord portion (56, 66) and over a side-part portion (53, 63), wherein the side-part portion (53, 63) is bent over with respect to the chord portion (56, 66) in the first subregion (41) and in the second subregion (42), and wherein a material thickness of the chord portion (56) in the first subregion (41) is greater than a material thickness of the chord portion (66) in the second subregion (42), and having a reinforcing plate (46, 47), which extends across the longitudinal joint (44), wherein the reinforcing plate (46, 47) is arranged close to one edge of the chord portion (56, 66) and wherein the distance from the reinforcing plate (46, 47) to the edge increases with increasing distance from the longitudinal joint (44).

A method for producing a concrete-pump boom-arm segment, wherein the boom-arm segment comprises 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), wherein a longitudinal joint (44) is produced between a first subregion (41) of the boom-arm segment and a second subregion (42) of the boom-arm segment, which joint extends over a chord portion (56, 66) and over a side-part portion (53, 63), wherein the side-part portion (53, 63) is bent over with respect to the chord portion (56, 66) in the first subregion (41) and in the second subregion (42), and wherein a material thickness of the chord portion (56, 66) is greater in the first subregion (41) than a material thickness of the chord portion (56, 66) in the second subregion (42), and arranging a reinforcing plate (46, 47), which extends across the longitudinal joint (44), wherein the reinforcing plate (46, 47) is arranged close to one edge of the chord portion (56, 66) and wherein a distance from the reinforcing plate (47, 47) to the edge increases with increasing distance from the longitudinal joint (44).