PURPOSE: To simplify connecting work between members, by embedding embedded nuts in a pair of members, and by connecting bolts fitted respectively and spirally on the nuts and screwed in the directions opposite to each other, with the mutually connecting nuts.

CONSTITUTION: Into the jointed end surfaces of a pair of PC concrete members 11 jointed to each other, embedded nuts 20 are previously embedded, and on the nuts 20, bolts 22, 23 projected from the flanges 17 of a joint plate 16 are spirally fitted, and the members 11 are connected to each other. The bolts 22, 23 are formed to be screwed in the directions opposite to each other, and the end sections of the bolts 22, 23 are connected to each other with a connecting nut 27. Then, by rotating the nut 27, the bolts 22, 23 are projected, and the bolts 22, 23 are spirally fitted on the nuts 20 of the members 11. As a result, the members 11 can be easily connected in close contact with each other.