Abstract: A set of stackable, planar shims is provided, with each shim having a series of projections on the top surface and corresponding recesses on the bottom surface, wherein the projections overlay the recesses. Each shim may be characterized by a bisecting line, with the series of projections and recesses being a reverse image of each other, on either side of the bisecting line. Notches in opposite corners of the shims facilitate aligning the shims in an interlocking arrangement, regardless of which surfaces of the shims are pressed into contact. The projections on the surface of the shim can be arranged to create a barrier to shear forces that are perpendicular to the sides of the shim and diagonal to the sides of the shim.

Abstract: A cover for a corbel that may be incorporated into a precast concrete structure is provided having a shell with an interior and an exterior, triangular sides and a bottom extending between the two sides. The opening in the cover is defined by a perimeter, with a first section of the perimeter lying in a first plane and a second section of the perimeter lying in a second plane. The intersection of the first plane and the second plane forms a right angle. The first section of the perimeter may be attached to the base of the ledge component of the corbel, and the second section of the perimeter may be attached to the back plate of the ledge or the mount plate.

Abstract: Al anchor is provided having a lifting pin, with a shaft, a head at an upper end of the shaft, and a foot at a lower end of the shaft, and the anchor further comprising an annular plate with an opening through the center, positioned with the shaft extending through the opening and the annular plate overlaying and supported by the foot. The annular plate has an area that is at least 80% of the area of a hypothetical circle circumscribing the annular plate.

Abstract: A precast concrete component is provided with anchor having a cylindrical rod bent to form a centrally-positioned handle and two downwardly extending legs. The handle can be relatively smooth and die legs are provided with a series of projections along their lengths, such as are formed by threads. The legs of the anchor may converge inwardly from the handle and are compatible with precast concrete double tees having webs or stems that taper from the flange of the double tee downward. Alternatively, the legs of the anchor may diverge outwardly from the handle.

Abstract: A flange connector is embedded in precast concrete structural member for use in joining adjacent concrete members together, wherein the flange connector is characterized by a center plate and legs extending back from each side of the center plate. Each of the legs is provided with projections extending from the top edge and bottom edge of the leg, in the same plane defined by the height and length of the leg. The projections extending from the top edge and the bottom edge of the leg may be mirror images of each other, so that the cross-sectional area of the leg is substantially the same over the portion of the leg with the projections. The legs of the flange connector may incorporate additional enhancements to increase the resistance to pull out, including a neck formed by notches in the top and bottom of each leg, adjacent the transition region extending from the center plate and one or more embossments creating a convex area on one side of each leg and a concave area on the opposite side of each leg.

Abstract: An erection anchor is provided having a head and first and second legs affixed to opposite sides of the head, whereby the first and second legs each have a threaded lower section extending downward, away from the head. The erection anchor may be embedded in a precast concrete panel, such as a multilayer panel having an insulation core layer sandwiched between concrete layers. The erection anchor may be embedded in the multilayer panel with the head exposed and the first and second legs each embedded in a concrete layer on opposite sides of the insulation layer.

Abstract: A concrete embeddable mount for a ledge is provided having a plate with a plurality of keyhole slots therein, four anchors extending from the back of the plate, for embedding the mount in a precast concrete component, wherein the anchors define vertices of a convex quadrilateral, and a fifth anchor extending from the back of the plate, wherein the fifth anchor is positioned within the convex quadrilateral defined by the four anchors. The invention further includes a ledge having a back plate and a perpendicular base extending from the back plate, wherein the back plate has a plurality of rearward extending studs aligned to engage the keyhole slots in the mount plate. Together, the mount and the ledge create a corbel system.

Abstract: A precast concrete component is provided with anchor having a cylindrical rod bent to form a centrally-positioned handle and two downwardly extending legs. The handle can be relatively smooth and die legs are provided with a series of projections along their lengths, such as are formed by threads. The legs of the anchor may converge inwardly from the handle and are compatible with precast concrete double tees having webs or stems that taper from the flange of the double tee downward. Alternatively, the legs of the anchor may diverge outwardly from the handle.

Abstract: An anchor system and method to provide support in concrete construction including a concrete-embeddable body having an aperture, one or more concrete anchor legs situated on a first plane, and one or more concrete anchor members situated on a second plane that is different from the first plane, and a strap having a matable head and an elongated strap body, wherein the matable head of the strap lockingly engages the aperture of the concrete-embeddable body.

Abstract: A magnetic step pin assembly for a concrete structure including an elongated plate having at least one magnet installed on a first side of the plate and at least two step pin pegs extending from a second side of the plate, and a plurality of cam pins for insertion into holes formed by the at least two step pin pegs, thereby forming a ladder for the concrete structure.

Abstract: A splice sleeve magnet assembly including a mounting plate having a front surface and a back surface with an aperture therethrough, a circular plunger having a centrally-located aperture, a device connector having a first end and a second end to couple the mounting plate with the circular plunger, and at least one magnet located on the mounting plate front surface so that the splice sleeve magnet may be inserted into a construction element and the device connector tightened to securely lock the splice sleeve magnet within the construction element.

Abstract: A magnetic blockout assembly including a concrete barrier element having a front side, a back side and a cavity in the front side, at least one magnet embedded within the back side of the concrete barrier element, and a flange connector having an engagement surface sized and shaped to fit within the cavity of the concrete barrier element, so that the concrete barrier element may be coupled to the flange connector to position the flange connector in a predetermined location and protect a surface of the flange connector from concrete and other foreign substances.