Erico International Corporation

Louis J Colarusso

John J Gregel

Mark V Samas

Edward D Ricker

Julian Albrigo

Lawrence Gene Gatton

Colleen M Kerkay

Jeff Kadlowec

Wilhelmus G Th Maas

Ray Olle

Mark Victor Samas

A process for forming an improved tensile strength deformed reinforcing bar splice for use in concrete construction by radially compressing or cold forming the bar end with dies literally to flatten any ribs or deformations on the bar end to cold work a section of the bar end which will extend beyond any threaded section and the mouth of a coupler thereon. The splice formed has superior tensile qualities. The process is inexpensive and may be accomplished at or near a construction site.

Deformed reinforcing bar splice and method

A high strength reinforcing bar splice uses a contractible jaw assembly bridging the bar ends to be joined. The jaw assembly includes interior teeth designed to bite into the projecting ribs or deformations on the outside of the bar ends which form the overall diameter of the bar but not the core or nominal diameter of the bar. The jaw assembly is constricted from both axial ends by driving tapered locking collars on each end of the jaw assembly with a tool while concurrently causing the jaw assembly to constrict and bite into the bar ends. When the tool is removed, the collars remain in place locking the jaw assembly closed. The splice provides not only high tensile and compressive strengths but also has good fatigue and dynamic strength to qualify as a Type 2 coupler.

Reinforcing bar connection and method

A reinforcing bar connection for concrete construction utilizes a sleeve supporting internal spring washers having flexible inner edges which engage a bar inserted in the sleeve. The reinforced inner edges of the washers bite into the bar and grip the bar preventing withdrawal. The washers have openings which permit the sleeve to be filled with a hardenable matrix such as grout or resin. In a preferred form, shoulder forming wedge grooves are formed in ends of the sleeve. The connection may be used as a dowel socket, a continuity set, or as butt end-to-end bar splice for axially aligned bar of the same or different size. The connection provides not only high compressive and tensile strengths but also will provide the dynamic and/or fatigue characteristics to qualify as Type 2 coupler approved for use in all United States earthquake zones.

A bar connection or splice and method uses a cage of relatively short bars which may be smaller reinforcing bars or threaded bars or rods. The bars of the cage may be joined by rings or wires and clamped to bridge or lap aligned bar ends. In one form, the concrete may be cast directly around to cage and bar ends to form the equivalent of a butt joined lap splice. In an enhanced form, the cage is included in a sleeve and set screws clamp the bars, cage and sleeve together. The sleeve may be filled with a hardenable matrix such as resin or grout, and then concrete is cast around the connection. The number of sets screws and bars of the cage may vary widely to form vertical and horizontal splices of axially aligned bar of the same or transitional sizes.

Reinforcing bar splice and method

A connection is provided between two dissimilar elements, such as an aluminum bus and a copper contact. Also provided is a method and apparatus for making the connection. One application is as an anode electrode hanger in an electric smelting furnace. The connection provides a lower resistance electrical connection which can be made while the power to the system is on. In a preferred form the contact is inserted and clamped in the bottom of a chamber in a refractory mold assembly. The chamber opening to the face of the mold assembly is somewhat deeper than the contact. The face of the mold assembly is clamped against the bus, and exothermic weld material is ignited to form a molten metal which drops into the chamber between the contact and bus. The weld metal forms a molecular weld bond with the bus, but only a mechanical interlock with the contact. To enhance the mechanical interlock and to improve the electrical conductivity, the surface area of the contact exposed to the weld metal is significantly increased, and the interlock formed increases both the strength of the connection and its electrical conductivity. The surface area increase is obtained by forming a series of parallel vertical undercut slots in the surface of the contact exposed to the weld metal, and such surface may also be tinned to form a brazed mechanical connection. The connection of the dissimilar metals can be made without shutting off the power and provides improved electrical conductivity.

Dissimilar element mechanical and electrical connection and method

To facilitate the casting of stronger and more precise steel reinforced concrete members and also to facilitate the formation and field joining of such members there is provided a bar splice which comprises a generally cylindrical sleeve open at one end to form an axially elongated chamber to receive a steel reinforcing bar telescoped therein, and provided with internal threads at the other end whereby a threaded bar end may be secured to the other end, and when secured sealing the other end of the chamber. The threads are preferably tapered and the chamber includes inwardly extending axially spaced annular ribs. Lateral ports are provided at each end of the chamber. The wall thickness of the chamber adjacent the threaded end of the sleeve may be increased to improve tensile capabilities. The length of the chamber is most of the splice sleeve since the threaded connection occupies little axial space.

Reinforcing bar splice and system for forming precast concrete members

To facilitate the casting of stronger and more precise steel reinforced concrete members and also to facilitate the formation and field joining of such members there is provided a bar splice which includes a generally cylindrical sleeve open at one end to form an axially elongated chamber to receive a steel reinforcing bar telescoped therein, and provided with internal threads at the other end whereby a threaded bar end may be secured to the other end, and when secured sealing the other end of the chamber. The threads are preferably tapered and the chamber includes inwardly extending axially spaced annular ribs. Lateral ports are provided at each end of the chamber. The wall thickness of the chamber adjacent the threaded end of the sleeve may be increased to improve tensile capabilities. The length of the chamber is most of the splice sleeve since the threaded connection occupies little axial space.

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Macedonia, OH, United States of America

Louis J Colarusso