Concrete insert

A concrete insert for casting in a. concrete wall panel, the concrete wall panel having an inside surface for attachment to a building, comprising:

• a housing having an elongate center portion and two opposing longitudinal sides, and two opposing longitudinal flanges;
• the elongate center portion, bounded by opposing outer longitudinal bend lines and having an outer attachment surface for mounting the elongate center portion substantially flush with the inside surface of the concrete wall panel, the elongate center portion defining a longitudinally oriented nut access slot;
• the opposing longitudinal sides depending inwardly from the opposing outer longitudinal bend lines to opposing inner longitudinal bend lines;
• the opposing longitudinal flanges depending from opposing inner longitudinal bend lines transversely to the opposing longitudinal sides and extending in mutually divergent relation;
• the housing further having a nut box insert comprising a nut box;
• a nut defining a threaded aperture, the nut slidably mounted in the nut box, the housing for constraining rotation of the nut for the threaded aperture in the nut to receive a threaded fastener through the nut access slot for attaching the concrete wall panel to the building;
• the nut box insert comprising at least one resilient layer carried by a compression plate, the compression plate attached to the housing, the compression plate for compressing the at least one resilient layer against the bottom of the nut for permitting the nut to be slidably located within the nut box and for holding the nut under pressure in a selected location in the nut box for the threaded aperture in the nut to receive the threaded fastener through the nut access slot while the nut is in the selected location.