a concrete dispensing boom for stationary and mobile concrete pumps has a plurality of boom arms , connected to one another at joints , and a concrete conveying line consisting of a plurality of pipe segments preferably connected to one another in an articulated manner via pipe bends and rotary couplings . said pipe segments run along the individual boom arms and are attached to these boom arms . at least one of the boom arms has a hollow chamber profile which has at least two hollow chambers separated from one another by a separating wall , at least one of which chambers is a closed chamber and one is open at the periphery . the pipe segment allocated to the boom arm concerned is disposed on the opening side outside , partially inside or inside the open hollow chamber .