Abstract: A variable assembly PC member includes: a plurality of hollow PC modules, each of which has an upper flange and a lower flange spaced apart from each other, and a pair of webs connecting both ends of the upper flange and the lower flange to form a hollow therein; and connectors connecting the plurality of hollow PC modules with each other in the width direction.

Abstract: A variable assembly PC member includes: a plurality of hollow PC modules, each of which has an upper flange and a lower flange spaced apart from each other, and a pair of webs connecting both ends of the upper flange and the lower flange to form a hollow therein; and connectors connecting the plurality of hollow PC modules with each other in the width direction.

Abstract: A self-supported PC column joint part. A plurality of accommodation pieces is buried in the upper surface of a lower member to which a PC column is to be joined, has accommodation spaces having open upper parts, and has female threads. A support bar is provided in a pocket formed in the lower end of the PC column, and includes a body coupled to the upper surface of the pocket to protrude and a head at the lower end of the body so as to be accommodated inside the accommodation space. A fixing piece has a through-hole formed in the center thereof such that the body of the support bar passes therethrough, and has threads formed on the outer peripheral surface thereof so as to be screw-coupled to the accommodation piece, thereby fixing the head of the support bar.