The variable-dimensional side bracket according to the present invention is in contact with two opposing linear structures from the lower side, and extends from the upper side in a long plate shape toward a direction away from the individual linear structures, and is plate-shaped in both edge regions of the plate shape. a fixing bracket partially folded at right angles to the extending direction of the shape; a position adjusting member passing through the folding part of the fixing bracket between the folding part of the fixing bracket and the plate shape; and the movement of penetrating the square bar together with the fixing bracket or protruding from the fixing bracket to penetrate the square bar on the fixing bracket while being inserted between the plate shape and the folding part of the fixing bracket and being in close contact with the positioning member and sliding along the plate shape of the fixing bracket Includes bracket.
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