The invention discloses a three-
purlin beam center node steel bottom plate prefabricating method. The method comprises the following steps that firstly, a non-spliced two
layers of special-shaped
steel plates are manufactured, then the
steel plates and steel bars are welded in advance into a whole, and next a whole module which is relatively independent and is formed one time is formed through pouring. According to the three-
purlin beam center node steel bottom plate prefabricating method, the whole can be hoisted to a design position during use, then the
deformation modulus generated in the
welding process of a steel template can be eliminated, the
steel bar binding quality is also greatly guaranteed, the binding space and time are also saved, and the working efficiency is improved; and hole digging in the node
steel plates and inter-plate concrete in-advance pouring construction method are adopted, so that the quality
invisibility problems that air in the
closed space cannot be discharged when concrete is poured, the concrete compactness is not easy to guarantee, and the saturation of the concrete cannot be measured are solved, the concrete
distribution uniformity and the structure continuity are facilitated, and the construction quality of
welding, binding and pouring is guaranteed to a great extent.