Self-supported pc column joint part

A self-supported PC column joint structure comprising:

• a plurality of receptacles (3), each of which is buried in a top surface of a lower member (2) to which a PC column (1) is to be joined, and has an accommodation space (31) with an open top side and a female thread formed in an inner circumferential surface thereof;
• a support bar (4) provided in a pocket (11) formed in a bottom end of the PC column (1), in a position corresponding to the receptacle (3), comprising a body (41) coupled to a top surface of the pocket (11) and protruding downward from the PC column (1) and a head (42) expanded from a bottom of the body (41) and received in the accommodation space (31) of the receptacle (3);
• and
• a fixing member (5), wherein a through-hole (51) is formed in a central portion of the fixing member (5) such that the body (41) of the support bar (4) extends therethrough, and a thread is formed in an outer circumferential surface of the fixing member (5) to be screw-engaged into the receptacle (3) to fix the head (42) of the support bar (4),
• wherein a coupler (13) fixed to a bottom end of a main root (12) within the PC column (1) is buried in the PC column (1) above the pocket (11), a top end of the body (41) of the support bar (4) is coupled to the coupler (13), and
• the head (42) of the support bar (4) is supported to, while being in tight contact with, a bottom surface of the accommodation space (31) of the receptacle (3), such that vertical load of the main root (12) of the column is directly transferred to the lower member (2) through the support bar (4).