PURPOSE: To promote stress transfer efficiency among beams themselves by bending main bars under beams upward, and inserting and connecting curve sections of the beams opposed to the head of a column respectively into approximately cylindrical steel pipes, and filling grout into the steel pipes.

CONSTITUTION: The exposed ends of main bars 3 under beams of the precast reinforced concrete beams 2 are respectively bent to approximate 90° upward to mount on the head of a column 1. Among curve sections of the exposed ends of the main bars 3 under the beams, the curve sections opposed to each other are inserted and connected to approximately cylindrical steel pipes 5. Then, after the insertion of the steel pipes 5, grout 6 is filled into the steel pipes 5, and concrete 7 is placed to the head of the column 1. According to the constitution, stress transfer efficiency among the beams themselves to be connected can be promoted.