| 摘要 |
The invention relates to a boom arm for a concrete-distributing boom (14), having an elongate box-profile support (24), which is formed, at least in part, from two flanges (26) and two webs (28), connecting the flanges laterally, and which, at an end portion, has two points of articulation (32, 34), which are spaced apart from one another in the longitudinal direction of the arm and are intended for the articulation of a hydraulic pivot drive (20), and having a sealing-barrier arrangement (42) for sealing a cavity region (40) of the box-profile support (24) at least in the region of flange openings (36, 38) at the points of articulation (32, 34). The invention proposes that the sealing-barrier arrangement (42) should have a single barrier plate (44), which spans the cavity region (40) between the points of articulation (32, 34) continuously in the longitudinal direction of the arm and is connected laterally to the webs (28). |
