Concrete nodes cast in steel hemisphere and construction method thereof

The invention relates to concrete nodes cast in a steel hemisphere and a construction method thereof. A node component is formed by connecting four parts, namely a buckled shell-like steel hemisphere, a round bottom sealing baseplate, a steel rib column connected with a building structure at the lower part and brackets connected with a building structure at the upper part; one end of each bracketis connected with the periphery of the shell-like steel hemisphere, and the other end of the bracket is connected with the building structure at the upper part; the bottom surface of the shell-like hemisphere is welded with the rounded bottom sealing baseplate of which the center is provided with pour holes; concretes are poured into the inside of the shell-like hemisphere by the pour holes; the rounded bottom sealing baseplate is welded with the top surface of the steel rib column; the steel rib of the steel rib column is composed of a round supporting top plate on the top surface and a cross rib steel rib connected