Curtain wall keel unit and pre-assembly construction method

The invention relates to the technical field of curtain wall construction, in particular to a curtain wall keel unit and a pre-assembly construction method.The curtain wall keel unit comprises a keel pre-assembly unit, the keel pre-assembly unit comprises an assembly stand column, and inner cavities of the upper end and the lower end of the assembly stand column are provided with a limiting check block and an insertion column correspondingly; the connecting frame is in a U shape with a downward opening, the two side faces of the connecting frame incline outwards, the edge of the connecting frame is folded outwards to form a buckling part, and the buckling part is in a U shape with an upward opening and is buckled to the side edge of the splicing cross beam. The beneficial effects are that the keel pre-assembling units are pre-installed on the ground, the two keel pre-assembling units located at the upper and lower adjacent positions are connected through the assembling stand columns and the inserting columns