US 12,168,882 B2
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
Ansgar Müller, Stuttgart (DE); and Roland Maassen, Munich (DE)
Assigned to Putzmeister Engineering GmbH, Aichtal (DE)
Appl. No. 16/956,055
Filed by Putzmeister Engineering GmbH, Aichtal (DE)
PCT Filed Dec. 18, 2018, PCT No. PCT/EP2018/085418
§ 371(c)(1), (2) Date Jun. 19, 2020,
PCT Pub. No. WO2019/121632, PCT Pub. Date Jun. 27, 2019.
Claims priority of application No. 10 2017 223 240.4 (DE), filed on Dec. 19, 2017.
Prior Publication US 2020/0370314 A1, Nov. 26, 2020
Int. Cl. E04G 21/04 (2006.01)
CPC E04G 21/0445 (2013.01) [E04G 21/0436 (2013.01); Y10T 137/8807 (2015.04)] 12 Claims
OG exemplary drawing
 
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.