PURPOSE:To make field operations easier by a method in which a receiver is fixed to beams in advance, the beams are joined with columns on site to make it receiving face automatically, and the notches of the floor are reinforced. CONSTITUTION:Receivers parts 11 and 12 of small steel pieces are welded to the ends of beams 3A and 3B, and the upsides of the parts 11 and 12 are leveled with the upsides of the beams 3A and 3B. Light-weight concrete floor parts 6 are set on the beams 3A and 3B, notches 7 are formed on the corners of the floor parts 6, and the downside of the notches 7 is received by the parts 11 and 12. End plates 5 are welded to the beams 3A and 3B, and the beams 3A and 3B are connected to the connecting blocks 4A and 4B of columns 2A and 2B by bolts. Field operations can thus be made easier.
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