Importance

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Abstract

The threaded end of a concrete reinforcement bar is enlarged in diameter so that the thread bottom exceeds the diameter of the surface ribs of the rebar. A coupler sleeve can then be advanced past the end threading and over the rib area, until the rebar end protrudes from the coupler sleeve. This allows splicing of two rebars without axially turning either rebar. Alternatively, the thread bottom does not exceed the maximum diameter of the rib deformations of the rebar but an immediately adjacent rib segment is flattened without removing rib material to preserve the net cross-sectional area of the rebar and maintain the tensile strength of the rebar. A pilot nose of reduced diameter leads the threaded portion into the female thread to facilitate thread alignment and can support a free standing rebar on a female coupling before engaging the threads.

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First Claim