Lance, for cooling fresh concrete at a mobile mixer, has a connection for a liquid gas feed to pass through a pipe into a porous component, opening into a second and larger pipe

摘要

The lance (1) to deliver a liquid gas into a mobile mixer, to prepare cooled fresh concrete, is held in place at the mobile mixer by clamps (6) and it has a connection (2) for the liquid gas feed e.g. liquid nitrogen. An initial pipe section (3) opens into a component (4) of a porous material, leading into a second pipe section (5). The diameter of the second pipe section is larger than the first pipe.