Reinforcing bar splice with threaded collars

Abstract

A reinforcing bar splice secures together reinforcing bar ends by utilizing, at both ends, both tapered-thread coupling and coupling involving a filler, such as a grout or an epoxy. The splice may include a central tapered-thread central sleeve or coupler, and a pair of collars that are screwed onto externally-threaded ends of the central sleeve. The central sleeve has a channel therethrough with tapered internal threads at both ends, and a center internal relief. The internal relief is an increased radius center portion that ensures full thread contact between the tapered internal threads and external threaded sections of the rebar ends. The sleeve has externally-threaded ends that are engaged by internally-threaded ends of a pair of collars. Distal to their internally-threaded ends, the collars have filler-material-receiving channels. The channels include plural sloped surfaces for aiding in securing filler material between the collars and the rebar ends.

Description

[0001]This application claims priority under 35 USC 119 to U.S. Provisional Application No. 60 / 758,687, filed Jan. 13, 2006.BACKGROUND OF THE INVENTION[0002]1. Technical Field of the Invention[0003]This invention relates generally to reinforcing bar splices.[0004]2. Description of the Related Art[0005]High tensile strength splices for reinforcing bar used in concrete construction have been widely employed. One type using a sleeve with internal deformations employs as a locking element filler metal formed from an exothermic reaction, such molten metal entering the sleeve through a tap hole. When the metal solidifies it forms a lock between the deformation on the interior of the sleeve, and the typical deformations found on the exterior of the reinforcing bar. These types of splices are sold by ERICO Inc. of Solon, Ohio, under the trademark CADWELD®. Examples of such splices may be seen in prior U.S. Pat. Nos. 3,234,603 and 3,255,498, to Leuthy et al.[0006]Another type of reinforcing ...

AI Technical Summary

Benefits of technology

[0010]According to another aspect of the invention, a reinforcing bar splice includes an internally threaded section for threadedly engaging tapered thread ends of reinforcing bars, and wider sections at distal ends of the splice, for engaging the reinforcing bars with a grout or epoxy. The wider sections may have ramped or sloped surfaces for improving the holding of the grout or epoxy.

[0011]According to yet another aspect of the invention, an internally tapered threaded reinforcing bar splice has a central relief therein. The central relief relieves thread stress concentrations, which may help retard fatigue crack initiation.

[0013]According to a further aspect of the invention, a tapered thread reinforcing bar splice achieves improved fatigue performance by transferring some of the load from a tapered thread portion of the splice to an epoxy- or grout-filled portion of the splice.

Problems solved by technology

All of these methods have their advantages and disadvantages, and none is ideal for all situations.

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