Screw-type reinforcing bar joint for deformed reinforcing bars and method for manufacturing the same

Abstract

The present invention provides a threaded rebar joint for reinforcing bars and a method for manufacturing the same, which offers excellent productivity, avoids the practical problem of reduced load-bearing capacity due to processing of the male threaded portion, and improves the performance of the rebar material itself. [Solution] This screw-type rebar joint for deformed rebar has a plurality of nodes 1ba arranged coaxially with the rebar body 1a at intervals in the longitudinal direction on the outer circumference of the round-shaft-shaped rebar body 1a. The spacing P between adjacent nodes 1ba and the height h of the nodes 1ba are adjusted within the allowable range according to JIS standards to increase the diameter D1 of the rebar body 1a.

Claims

1. A screw-type reinforcing bar joint having a round-shaped reinforcing bar body and a plurality of nodes provided coaxially with the reinforcing bar body at intervals in the longitudinal direction on the outer circumference of the reinforcing bar body, A screw-type reinforcing bar joint for reinforcing bars in which the shaft diameter of the reinforcing bar body is increased by adjusting the spacing between adjacent nodes and the height of the nodes within the allowable range specified in the JIS standard.

2. A screw-type reinforcing bar joint for a reinforcing bar according to claim 1, wherein the spacing between adjacent nodes is 60% to 70% of the nominal diameter of the reinforcing bar body, and the height of the nodes is 100% to 125% of the minimum allowable dimension.

3. A screw-type reinforcing bar joint for a deformed reinforcing bar, having a round-shafted reinforcing bar body, a plurality of nodes provided coaxially with the reinforcing bar body at intervals in the longitudinal direction on the outer circumference of the reinforcing bar body, and a rib extending in the longitudinal direction, A screw-type rebar joint for deformed rebars, wherein a flattened indentation portion is formed on the rib at the end of the rebar by plastic deformation, and a male thread is formed on the end of the rebar.

4. A screw-type rebar joint for deformed reinforcing bars according to claim 3, comprising a screw-tube-shaped connecting member that screws onto the male screw, wherein the incomplete thread portion of the male screw is crushed.

5. A screw-type rebar joint for deformed reinforcing bars according to claim 4, wherein the male thread has a threaded portion that screws into the connecting member and an exposed portion that does not screw into the connecting member, and the male thread is formed such that the push-in portion is formed only on the exposed portion.

6. A method for manufacturing a screw-type reinforcing bar joint for a deformed reinforcing bar having a round-shafted reinforcing bar body with a plurality of nodes provided at intervals in the longitudinal direction on the outer circumference and ribs extending in the longitudinal direction, A method for manufacturing a screw-type reinforcing bar joint for deformed reinforcing bars, comprising a pressing process in which the ribs at the ends of the reinforcing bars are flattened by plastic deformation, and after this pressing process, male threads are formed at the ends of the reinforcing bars.

7. A method for manufacturing a screw-type reinforcing bar joint for deformed reinforcing bars according to claim 6, comprising, after the pressing process, a circular processing step in which the end of the reinforcing bar is processed to have an outer diameter such that the knot portion is substantially eliminated in the length range in which the male thread is formed, and after this circular processing step, the male thread is formed.

Images