The ornamental design for a concretereinforcementretainingchair, as shown and described.
FIG. 1 is an illustrative view of a concrete reinforcement retaining chair;
FIG. 2 is an alternate illustrative view of the concrete reinforcement retaining chair shown in FIG. 1;
FIG. 3 is a right side elevation view of the concrete reinforcement retaining chair of FIG. 1; a left side elevation view of the concrete reinforcement retaining chair of FIG. 1 (not illustrated) is a mirror image of the right side elevation;
FIG. 4 is a front elevation view of the concrete reinforcement retaining chair of FIG. 1; a back side elevation view of the concrete reinforcement retaining chair of FIG. 1 (not illustrated) is a mirror image of the front elevation view;
FIG. 5 is a bottom elevation view of the concrete reinforcement retaining chair of FIG. 1; and,
FIG. 6 is a top elevation view of the concrete reinforcement retaining chair of FIG. 1.
The broken lines in the drawings depict environmental subject matter only and form no part of the claimed design.