Topological PEC combination column node structure and installation method

The invention discloses a topological PEC combination column node structure which comprises a PEC combination column, a middle web clamping plate and a hemming clamping plate. The PEC combination column comprises a steel rib, reinforcement cages and concrete, the section of the steel rib is in an I shape, the steel rib comprises a middle web and wing plates connected to the two sides of the web, curled edges are arranged on the edges of the wing plates, the reinforcement cages are arranged on the two sides of the web respectively, the concrete is poured into the reinforcement cages, and connecting areas where the concrete is not poured are arranged at the two ends of the steel rib and used for joint connection. The middle web clamping plate is connected with a web plate of the upper-layer PEC combination column and a web plate of the lower-layer PEC combination column through bolts, and the curled edge clamping plate is connected with a curled edge of the upper-layer PEC combination column and a curled edge o