Minimum Spacing of Reinforcements is conctrolled automatically according to Codes.
İnternational Design Codes
ACI 318-19 : Minimum Spacing of Reinforcement
TSC 2018 : TSC Minimum Spacing of Reinforcement
Notation in ACI 318-19
dagg = Nominal maximum size of coarse aggregate, in.
db = Nominal diameter of bar, wire, or prestressing strand, in.