Abstract: Systems and methods for reinforcing a concrete slab or balcony are disclosed. The systems and methods may include cutting a groove in a portion of the concrete slab and inserting a rod into the groove. The groove may then be filled with a resin. The rod may optionally be secured by other or additional methods. The integrity of the concrete slab or balcony may then be strengthened by the inclusion of the rod in the slab.

Abstract: A metal anchor bracket which is embedded into the surface of a semi-solid concrete wall before the concrete has set. The bracket has a reference surface which when flush with the surface of the concrete wall produces a vertical surface which is perpendicular to the surface of the wall. The vertically extending surface provides an anchor for steel super structural members which are attached thereto. A second vertically extending leg is immersed into the soft concrete to anchor the bracket in the concrete.

Abstract: A structural element having a fire rating of approximately two hours when tested with the standard time-temperature curve established by the American Standards for Testing Materials, said element including prestressed concrete joists each having a plate-like body portion and reinforced support ledges, each ledge has a nailing strip molded adjacent the bottom thereof and each nailing strip including a penetratable area formed internally adjacent thereof, a plurality of sheets of material disposed adjacent the ends of said ledges, each sheet of material forming a butt joint with an adjacent sheet which extends longitudinally along one of said ledges, channel-shaped members disposed along each butt joint intermediate said ledge portion and said sheets and attachment means for attaching said channel-shaped members to the nailing strips and, also, for attaching sheets of material to said nailing strips and channel-shaped members whereby said sheets of material are secured to the joist while preventing undesirable