| 摘要 |
PROBLEM TO BE SOLVED: To provide a joint for a construction site baseplate capable of being safely used. SOLUTION: Projections 5 and 6 having both tapered sides 3 and 4 for positioning a base iron plate to be connected are provided to positions at equal intervals to both sides from the center part of the circular or square base iron plate, a base 1 having screw holes is provided at the center part of the iron plate, holes with a small diameter passing through screw bolts and holes with a large diameter housing screw heads of the screw bolts are provided at the center part of the circular iron plte for molding an angle section on the upper surface side into an R, and in the lower surface of the iron plate, a cup 9 having pins and the screw heads passing through holes having a small diameter housed in holes with a large diameter of the cup on the upper end of a bolt having a screw section screwing in the screw holes in the base 1 are provided at positions opposed to the positions at equal intervals to both sides from the projections 5 and 6 of the base 1.
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