Cast-in-place slab reinforcement mainly includes: stressed reinforcement (unidirectional or bidirectional, single-layer or double-layer), load-bearing negative reinforcement, distributed reinforcement, additional reinforcement (corner additional radial reinforcement, hole additional reinforcement) and lacing (double-layer reinforcement supports the upper and lower floors).

(1), the length of reinforced bar = axis size+left anchorage+right anchorage+hooks at both ends (if it is grade I reinforcement); Number of roots = (net length of slab-100MM)/ spacing between steel bars+1.

(2), negative reinforcement length = negative reinforcement length+left bend+right bend; Negative reinforcement quantity = (reinforcement range-deduction)/reinforcement spacing+1

(3) Reinforcement length = negative reinforcement arrangement range length-negative reinforcement minus impairment: reinforcement quantity of negative reinforcement = negative reinforcement length/reinforcement spacing+1.

(4), additional reinforcement (corner additional radial reinforcement, hole additional reinforcement), support reinforcement (double reinforcement supporting the upper and lower floors)

According to the actual situation, directly calculate the length and quantity of reinforcement.