Ventilation duct supporting structure

The utility model relates to a ventilating duct supporting structure which is characterized in that a ventilating duct is a rectangular channel which is through from top to bottom, a plurality of floors are arranged outside the side wall of the ventilating duct at intervals from top to bottom, structural steel bars are fixedly arranged in the floors, and a supporting piece is fixedly arranged in the side wall of the ventilating duct at the position corresponding to each floor; the structure of the supporting piece is a rectangular angle steel frame attached to the inner diameter of the ventilating duct, two cantilever type reinforcing steel bars are fixedly installed on the outer side of the long edge of the rectangular angle steel frame at intervals, and the reinforcing steel bars penetrate into the floor layer plates and are firmly welded to the structural reinforcing steel bars. The ventilation duct is installed at the position, corresponding to each floor slab, of a channel and fixed to floor slab structu