UPSTREAM BRIDGE FOR SCOOPING SURFACE SCUM FROM SEWAGE BODY SURFACE

摘要

The invention concerns a preliminary boom (7) for clearing the sludge floating on the surface of a sewage basin (1), the boom being fitted with a sweeper (4) and being mounted at one end so that it can rotate on a central mounting (10) round a column (2) in the middle of the circular basin (1), the other end of the boom resting via wheels (9) on the rim (3) of the basin (1). In order to be able to mount the boom (7) simply on the column (2) in the middle of the basin (1), without the need to remove the sweeper beforehand, the invention proposes that the central mounting (10) for the boom (7) is designed in the form of several parts extending circumferentially. The mounting (10) thus consists of an outer ring (13) made up of at least two parts extending circumferentially and to which the boom (7) is attached, plus an inner ring (12) also made up of at least two parts extending circumferentially and which preferably has a U-shaped cross-section, the open side of the U facing out towards the outer ring (13). Fitted on the side of the outer ring (13) facing the inner ring (12), spaced at intervals round the whole of the outer ring, are roller wheels (14 to 17) which extend into the U-section of the inner ring (12) and rest against either the lower (35) or the upper (36) arm of the inner ring (12) in such a way that they can rotate.