A stackable rebar chair includes a one-piece body of molded plastic that includes four vertical support legs and four vertical leg receiving sockets. The one-piece body also includes first and second concave rebar cradles that are oriented perpendicular to each other. Each of the support legs has a cross section that defines a first polygon, and each of the leg receiving sockets defines a partial second polygon that is both larger, and differently shaped, that the first polygon. When the rebar chairs are stacked, the four supporting legs of the upper chair are received in the leg receiving sockets of the lower chair in such a manner that a plurality of vertices of the first polygon are positioned, shaped and oriented to simultaneously match respective vertices of the partial second polygon.

The invention relates to a concrete shaping insert, which is formed to be arranged in a formwork mold before a concreting process, comprising a first and second fixing element, between which at least one displacement body is arranged. The concrete shaping insert is characterized in that, the displacement body has an interstitial tube and that the first and second fixing element are connected to one another with at least one connecting component, which proceed through the interstitial tube.

A system for use with a post-tensioning concrete anchor may comprise a connector anchor including a bore therethrough, the bore including a first frustoconical portion, the connector anchor adapted to bear on the post-tensioning concrete anchor, and a coupler. The coupler may comprise a coupler body including a bore therethrough, the bore including a second frustoconical portion that is oriented oppositely to the first frustoconical portion, and a connector having a bore therethrough and configured to receive the coupler body therein, the connector adapted to mechanically engage the connector anchor such that a tensioning force can be transmitted from the coupler body to the connector anchor via the connector. A method of using the system may allow a second concrete section to be poured adjacent to a first concrete section before the first concrete section has been stressed.

A system for use with a post-tensioning concrete anchor may comprise a connector anchor including a bore therethrough, the bore including a first frustoconical portion, the connector anchor adapted to bear on the post-tensioning concrete anchor, and a coupler. The coupler may comprise a coupler body including a bore therethrough, the bore including a second frustoconical portion that is oriented oppositely to the first frustoconical portion, and a connector having a bore therethrough and configured to receive the coupler body therein, the connector adapted to mechanically engage the connector anchor such that a tensioning force can be transmitted from the coupler body to the connector anchor via the connector. A method of using the system may allow a second concrete section to be poured adjacent to a first concrete section before the first concrete section has been stressed.

A shear connector for use with insulated concrete panels. The shear connector comprises an elongated core member that includes a first end and a second end, and a flanged end-piece removably secured to one of the first end or the second end of the core member. At least a portion of the flanged end-piece includes a maximum diameter that is larger than a maximum diameter of the core member. The shear connector is configured to transfer shear forces.

A spacer for spacing the reinforcing cage from the forms used in making concrete products. The spacer of the invention is made from plastic in the shape of a wheel with spokes that join an outer ring with an inner ring that engages a horizontal wire on the wire cage. The rings have gaps to provide for installation of the spacer on a cage wire. The gap in the outer ring is closed by a latch that when properly engaged, will lock the spacer in place on the wire, thus positively holding the spacer on the wire once it is locked in place.

A system for centering a reinforcing member within a drilled shaft/bore hole includes a first cage member and a second cage member. The first cage member is operable to surround a first half of the reinforcing member. The second cage member is operable to surround a second half of the reinforcing member. The second cage member is operably connected to the first cage member, and the first and second cage members have identical shapes.

Systems and methods for a concrete apparatus with incorporated lifter are provided. A concrete apparatus is formed by placing a reinforcement system in a mold. The reinforcement system comprises a lifter. Concrete is poured into the mold such that the lifter protrudes from the poured concrete. After the concrete has hardened and the mold is removed, the lifter is used to carry and position the concrete apparatus. After the concrete apparatus is positioned, the lifter is removed at the circumference of the concrete apparatus leaving no holes, thereby eliminating water leakage due to lifting methods.

A variable spacer system of insulated concrete forms includes at least two panels, each panel including at least one cavity beginning at the top of the panel and ending prior to the bottom of the panel. The system further includes at least one spacer able to couple the two panels, when parallel, by entering the cavities at the tops of the panels and resting at the ends of the cavities. The cavities also accept at least one other spacer having the same dimensions as the spacer except a different thickness.

A concrete dowel slip tube assembly is provided for use in maintaining a planner consistency of a cured concrete slab formed on a support surface. The assembly comprises a plurality of elongate slip tubes, each having a length dimension and a tubular hollow interior compartment. Dowels are slidingly engageable to the hollow interior compartment to allow for translation along the interior compartment. A support frame defines a plurality of integral slip tube retaining members, disposed at evenly spaced locations along the support frame, the retaining members being configured to receive and engage associated slip tubes to the support frame in a common defined orientation. The support frame and the retaining members are formed as a unitary construction.