WO2018070075A1 - Screw-type rebar joint of deformed rebar and manufacturing method thereof - Google Patents

Screw-type rebar joint of deformed rebar and manufacturing method thereof Download PDF

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Publication number
WO2018070075A1
WO2018070075A1 PCT/JP2017/023758 JP2017023758W WO2018070075A1 WO 2018070075 A1 WO2018070075 A1 WO 2018070075A1 JP 2017023758 W JP2017023758 W JP 2017023758W WO 2018070075 A1 WO2018070075 A1 WO 2018070075A1
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Prior art keywords
reinforcing bar
diameter
deformed
thread
rebar
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PCT/JP2017/023758
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French (fr)
Japanese (ja)
Inventor
章 福田
廣三 ▲脇▼山
敬二 平井
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章 福田
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Publication of WO2018070075A1 publication Critical patent/WO2018070075A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F15/00—Connecting wire to wire or other metallic material or objects; Connecting parts by means of wire
    • B21F15/02—Connecting wire to wire or other metallic material or objects; Connecting parts by means of wire wire with wire
    • B21F15/06—Connecting wire to wire or other metallic material or objects; Connecting parts by means of wire wire with wire with additional connecting elements or material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21H—MAKING PARTICULAR METAL OBJECTS BY ROLLING, e.g. SCREWS, WHEELS, RINGS, BARRELS, BALLS
    • B21H3/00—Making helical bodies or bodies having parts of helical shape
    • B21H3/02—Making helical bodies or bodies having parts of helical shape external screw-threads ; Making dies for thread rolling
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/16—Auxiliary parts for reinforcements, e.g. connectors, spacers, stirrups
    • E04C5/18—Spacers of metal or substantially of metal
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/12—Mounting of reinforcing inserts; Prestressing

Definitions

  • the present invention relates to a deformed reinforcing bar screw-type reinforcing bar joint used for reinforced concrete and a manufacturing method thereof.
  • deformed reinforcing bars are generally used as reinforcing bars because of their excellent fixing properties.
  • reinforcing bar joints that connect deformed reinforcing bars, such as lap joints, and threaded reinforcing bar joints that simplify the bar arrangement and shorten the construction period.
  • threaded rebar joints when the male thread part is simply formed on the rebar by cutting, the yield strength decreases due to the cross-sectional defect, so a large diameter part is formed in the rebar, and the male thread is rolled to this large diameter part.
  • Patent Document 1 has been proposed (for example, Patent Document 1). In this proposed example, it is also proposed to eliminate play by providing a lock nut.
  • the reinforcing bar joint proposed by Patent Document 1 has an advantage that the male screw part is excellent in yield strength because a large diameter part is provided in the reinforcing bar and a male screw is processed in the large diameter part.
  • the manufacturing cost increases. If the large-diameter portion is formed on the reinforcing bar material at the time of roll forming of the deformed reinforcing bar nodes and ribs, an increase in manufacturing cost can be suppressed to some extent, but it is not sufficient. Further, according to roll forming, the large diameter portion of the reinforcing bar is formed at a constant pitch according to the roll diameter, but a slight pitch shift occurs.
  • An object of the present invention is to provide a threaded reinforcing bar joint of a deformed reinforcing bar and a method of manufacturing the same, which is excellent in productivity and does not cause a practical problem of yield strength reduction due to processing of a male screw part. is there.
  • the threaded reinforcing bar joint of the first deformed reinforcing bar according to the present invention has a pair of reinforcing bars connected to each other by a threaded cylindrical coupler that is provided at the ends of both reinforcing bars and is screwed into the male threaded part, and one or both of the pair
  • the rebar is a deformed rebar having a plurality of nodes spaced apart in the longitudinal direction on the outer periphery of a round shaft-shaped rebar main body and having a protrusion extending in the longitudinal direction.
  • the end portion of the one or both reinforcing bars has a male threaded portion whose thread groove diameter is narrower than that of the reinforcing bar main body, and the male threaded portion has a portion having a large thread diameter at a plurality of locations corresponding to the node portions,
  • the rest is a portion with a small thread diameter except for the same circumferential location as the ridge, the thread groove diameters of both portions are the same, and the thread groove depth of the portion with the thin thread diameter is 70% or more of the thread groove depth of the thick part of the thread diameter, and the thread diameter of the thick part of the thread diameter is thicker than the reinforcing bar main body of the reinforcing bar and includes the ridge.
  • the male screw part is harder than other parts of the reinforcing bar or has a higher tensile strength, and includes a cylindrical coupler that is screwed into the male screw part of both reinforcing bars.
  • both the reinforcing bars can be connected by screwing the male threaded part of a pair of reinforcing bars into the coupler, and the arrangement of the reinforcing bars can be simplified and the construction period can be shortened as in the case of a general reinforcing bar joint. Since the male thread portion has a thread groove diameter thinner than that of the reinforcing bar main body and a thread diameter larger than that of the reinforcing bar main body and smaller than the maximum diameter, the deformed reinforcing bar used as a material is not subjected to a lower process, or It can be formed simply by applying a sub-process of round processing.
  • the male threaded portion is formed by threading the deformed reinforcing bar without subjecting it to a large downsizing such as increasing the diameter, the productivity is excellent. Since the thread groove diameter of the male thread part is narrower than the main body of the reinforcing bar, there is a concern that the strength of the joint part such as tensile strength of the reinforcing bar will be reduced, but the strength of the male thread part is harder than other parts, so the yield strength is reduced. Can be compensated for and sufficient proof stress can be obtained. The degree of hardness or strength required to compensate for the decrease in yield strength due to the groove processing of the male screw portion is sufficient to be the work hardening (also called plastic hardening) obtained by rolling the male screw portion.
  • work hardening also called plastic hardening
  • Another embodiment of the threaded reinforcing bar joint of the deformed reinforcing bar according to the present invention includes a pair of reinforcing bars connected to each other by a threaded cylindrical coupler that is provided at the ends of both reinforcing bars and screwed into the male threaded portion.
  • the one or both reinforcing bars are deformed reinforcing bars having a plurality of nodes spaced apart in the longitudinal direction without having protrusions extending in the longitudinal direction on the outer circumference of the round shaft-shaped reinforcing bar body,
  • the end portion of the one or both reinforcing bars has a male threaded portion whose thread groove diameter is narrower than that of the reinforcing bar main body, and the male threaded portion has a portion having a large thread diameter at a plurality of locations corresponding to the node portions,
  • the remainder is a portion having a small thread diameter, the thread groove diameters of both portions being the same, and the thread groove depth of the portion having the thin thread diameter is equal to the thread groove depth of the portion having a large thread diameter.
  • the thread diameter of the thick part of the thread diameter is thicker than the rebar main body of the rebar and smaller than the maximum diameter including the protrusions
  • the hardness of the male thread portion is It is characterized by comprising a cylindrical coupler that is harder or has a higher tensile strength than the other parts and that is screwed into the male threaded portions of both reinforcing bars.
  • bamboo rebars are generally composed of a round shaft-shaped reinforcing bar body and joints / ribs, but the ribs also contribute to the tensile strength and account for about 4%.
  • the male thread portion is machined on the deformed reinforcing bar, the rib is interrupted at the thread groove portion, and the tensile strength that contributes to the cross-sectional area of the rib is reduced. As a result, the male screw portion becomes a local weak portion of the tensile strength.
  • the male screw portion being a locally weak portion of the proof stress by making the reinforcing bar into a shape that does not have protrusions such as ribs extending in the longitudinal direction as described above. If the ridges are simply eliminated, the tensile strength of the entire rebar will be reduced by that amount, but the male threaded portion has increased tensile strength due to work hardening by rolling, etc., so the necessary strength was maintained. It is. In order to ensure further reliability, it is only necessary to use a reinforcing bar whose diameter is larger than that of the ribs and the like.
  • the one or both reinforcing bars have two sections 180 ° apart from each other on the outer peripheral surface, and the cross section perpendicular to the axial direction is the outer periphery of the reinforcing bar main body.
  • belt-shaped flat part which is a straight line used as the one part arc of the circle which comprises a surface over the full length of an axial direction.
  • the manufacturing method of the threaded reinforcing bar joint of the deformed reinforcing bar of the present invention is a method of manufacturing the threaded reinforcing bar joint of the deformed reinforcing bar having any one of the configurations of the present invention, and has a deformed reinforcing bar having a protrusion on the outer periphery of the reinforcing bar main body.
  • a cutting process in which the male screw part is cut into an arbitrary length, a male screw rolling process in which the male screw part is processed by rolling without subjecting the end of the cut reinforcing bar to a diameter expansion process, and a pair in which the male screw part is processed Preparing a coupler to be screwed into the male thread portion of the reinforcing bar.
  • a perfect circle having an outer diameter to the extent that the protrusion is substantially eliminated in a length range in which the male thread portion is formed at the end of the reinforcing bar after the cutting process.
  • a rolling process may be included, and the rolling may be performed after the machining process. Even if the deformed reinforcing bar is rolled as it is, the necessary male screw part can be obtained. However, because the deformed reinforcing bar has protrusions such as nodes and ribs, burrs may be generated by rolling. By performing rolling after the perfect circle processing, the generation of the burr is eliminated and a male screw part can be obtained beautifully.
  • the perfect circle processing for eliminating the generation of burrs may be to the extent that the protrusions such as the joints and ribs are removed, and the base end of the protrusions may remain. It is not preferable to make it thinner than that because the yield strength is reduced by reducing the diameter.
  • FIG. 14B is a cross-sectional view taken along the line XIVB-XIVB of FIG. 14A. It is sectional drawing equivalent to FIG. 14B in the modification of a deformed reinforcing bar. It is process explanatory drawing of the manufacturing process of the screw-type reinforcing bar joint of the deformed reinforcing bar which concerns on 5th Embodiment. It is XVB-XVB sectional drawing of FIG. 15A. It is process explanatory drawing of the manufacturing process of the screw-type rebar joint.
  • FIG. 14B is a cross-sectional view taken along the line XIVB-XIVB of FIG. 14A. It is sectional drawing equivalent to FIG. 14B in the modification of a deformed reinforcing bar. It is process explanatory drawing of the manufacturing process of the screw-type reinforcing bar joint of the deformed reinforcing bar which concerns on 5th Embodiment. It is XVB-XVB sectional drawing of FIG. 15A. It is process explan
  • 16B is a cross-sectional view taken along the line XVIB-XVIB of FIG. 16A. It is process explanatory drawing of the manufacturing process of the screw-type rebar joint. It is process explanatory drawing of the manufacturing process of the screw-type rebar joint. It is explanatory drawing of the rolling of a reinforcing bar and the rib removal process in the screw-type reinforcing bar joint. It is sectional drawing of the screw-type reinforcing bar joint of the deformed reinforcing bar which concerns on 6th Embodiment of this invention. It is sectional drawing which shows the example which attached the fixing board by the screw coupling
  • the threaded reinforcing bar joint of the deformed reinforcing bar is a reinforcing bar joint for connecting a pair of reinforcing bars 1 and 1, and has a male threaded portion 1 c at the opposite end of the pair of reinforcing bars connected to each other.
  • the coupler 2 is screwed over the male screw portions 1c and 1c. Both male screw portions 1c and 1c are screws in the same direction in this embodiment, but may be reverse screws.
  • the coupler 2 has a steel screw cylinder shape in which a female screw portion 2a that is screwed into the male screw portions 1c and 1c is formed.
  • the outer peripheral surface of the coupler 2 may be a cylindrical surface, or a part or the whole of the length direction may be a polygon that engages with a screw tightening tool (not shown) or a flat surface in part. It may have a shape.
  • Each reinforcing bar 1 is a deformed reinforcing bar having a protrusion 1b on the outer peripheral surface of a round shaft-shaped reinforcing bar main body 1a.
  • the protrusion 1b is composed of a node 1ba extending in the circumferential direction at regular intervals in the longitudinal direction of the reinforcing bar and a rib 1bb extending in the longitudinal direction. Two ribs 1bb are provided at a position 180 degrees away from the reinforcing bar main body 1a.
  • Each node 1ba has an annular shape that continues around the entire circumference.
  • the node portion 1ba may have a shape in which half circumferences extending between the two ribs 1bb and 1bb are alternately arranged in the longitudinal direction of the reinforcing bar.
  • the protrusion 1b is not limited to the shape formed by the node portion 1ba and the rib 1bb as described above, and is formed in a spiral shape by one or two spirals, and the space between the intersecting portions is It may be a diamond shape or the like.
  • the male screw portions 1c and 1c of the reinforcing bars 1 and 1 are rolling screws, and at least the surface layer is harder than other portions of the reinforcing bars 1 and 1 by work hardening (also called plastic hardening). .
  • the male screw portion 1c of the reinforcing bar 1 has a base end of the node portion 1ba and the rib 1bb in order to improve the accuracy of threading the node portion 1ba and the rib 1bb as will be described later.
  • the dimensions are different depending on whether or not the node 1ba is present as follows.
  • the axial width portion with the node 1ba and the axial width portion without the node 1ba have the male screw portion 1c.
  • the diameter dimensions are the same.
  • the thread diameter of the male screw portion 1c differs between the location of the reinforcing bar main body 1a and the portion 1ba 'in which the node portion 1ba is processed into a perfect circle as shown in FIG. 1B.
  • the screw groove diameter is the same D3 1 both.
  • the thread groove depth h1 in the male thread portion 1c formed in the reinforcing bar main body 1a is, for example, 75 to 80%, 75 in this example, with respect to the thread groove depth h0 of the rounded portion 1ba 'of the node portion 1ba. %.
  • the ratio h1 / h0 of the thread groove depth is 70% or more, it is confirmed by simulation that there is no hindrance to fastening as a reinforcing bar joint even in a portion threaded on the reinforcing bar main body 1a in the male screw portion 1c. Has been.
  • each part of the reinforcing bar 1 is as follows.
  • the outer diameter D1 of the reinforcing bar body 1a is 17.88, the maximum diameter.
  • D2 (node portion outer diameter of 1ba) is 20.68, crest diameter D3 2 is 19.674, screw effective diameter D3 0 is 18.05, the screw groove diameter D3 1 is 16.607 (unit: mm) .
  • the length L1 of the male screw portion 1c need only be a necessary screwing length with respect to the coupler 2, but it is preferable to set the length of the entire coupler 2 to be screwed as shown by an imaginary line in FIGS. 1A and 1B.
  • the entire coupler 2 is screwed into the male threaded portion 1c of either one of the reinforcing bars 1, and after the end surfaces of both reinforcing bars 1 and 1 are aligned, the coupler 2 is unscrewed while the other reinforcing bar 1 is unscrewed. It can be screwed into the male screw portion 1c. Therefore, it is not necessary to screw the reinforcing bar 1 while pulling it, and the workability of the on-site connection is improved.
  • the cross-sectional shape of the thread groove of the male screw portion 1c may be triangular or trapezoidal.
  • FIG. 3A shows a reinforcing bar 1 which is a deformed reinforcing bar as a material.
  • This rebar 1 is cut into a desired length at a construction site or factory (cutting process) (FIG. 3B).
  • a round process is performed on a portion of the cut end of the rebar 1 in a length range that forms the male screw part 1c (round process) (FIG. 3C). In this round process, as described above, a round is cut into a perfect circle having an outer diameter D5 (FIG.
  • the outer diameter D5 is slightly larger than the outer diameter D1 of the reinforcing bar main body 1a. Since there is a change in some sizes over threaded, the outside diameter D5 is different from the crest diameter D3 2 of the male screw portion 1c.
  • the outer diameter D5 may be the same as or slightly smaller than the reinforcing bar main body outer diameter D1.
  • the male thread portion 1c (effective diameter D3 0 ) is formed by rolling on the portion of the reinforcing bar 1 that has been subjected to the perfect circle processing (male thread rolling process) (FIG. 3D).
  • crest diameter D3 2 is the larger than the outer diameter D5 of a perfect circle processing
  • the effective diameter D3 0 is the outer diameter D5 of the perfect circle machining the composition flow.
  • This rolling is performed by using a rolling tool (not shown) fitted on the outer periphery of the reinforcing bar 1 or a rolling facility (not shown) composed of a pair of opposing rolling rolls, for example, cold, warm, or Do it hot. More specifically, this rolling is, for example, a so-called three-point rolling process in which screw machining is performed at three points.
  • the male screw portion 1c is hardened by work hardening. Further, the screw groove diameter D3 1 of the male screw portion 1c is thinner than the outer diameter D1 of the reinforcing bar body 1a, and becomes thicker than the outer diameter D1 of the reinforcing bar body 1a crest diameter D3 2 'by swelling during rolling.
  • the perfect circle processing (FIG. 3C) is not necessarily performed. Further, the length of the round processing and rolling of the male threaded portion 1c is made longer for length adjustment, and the male threaded portion 1c is cut at the location of the bar arrangement in accordance with the place of use, and used for the reinforcing bar joint. Again. This improves the workability.
  • both the rebars 1 and 1 can be connected by screwing the male thread portions 1c and 1c of the pair of rebars 1 and 1 into the coupler 2, and simplification of the bar arrangement as in the case of a general rebar joint.
  • the construction period can be shortened.
  • the male screw portion 1c thinner than the outer diameter D1 of the screw groove diameter D3 1 rebar body 1a, thicker than the outer diameter D1 of the crest diameter D3 2 rebar body 1a, also narrower than the maximum diameter D2.
  • the male threaded portion 1c can be formed as it is without subjecting the deformed reinforcing bar 1 as a raw material to a lower processing as it is or by performing a round processing by a perfect circle processing. Since the male threaded portion 1c is formed by threading the deformed reinforcing bar 1 without performing a large down-sizing such as increasing the diameter, the productivity is excellent.
  • the groove diameter D3 1 of the male screw portion 1c narrow than the outer diameter D1 of the reinforcing bar body 1a, a scratch tension, etc. of the reinforcing bars in the joint portion but decrease in strength is feared, the hardness of the male screw portion 1c of the other Since it is harder than the part, it can compensate for a decrease in yield strength, and a sufficient yield strength can be obtained.
  • the degree of hardening required to compensate for the decrease in yield strength due to the groove processing of the male screw portion 1c is sufficient for the work hardening obtained by rolling the male screw portion 1c. Therefore, if a male thread part is rolled to the deformed reinforcing bar 1 as it is, the hardness required for the male thread part 1c can also be obtained. For this reason, the process for exclusive use for raising the hardness of the external thread part 1c is unnecessary, and it is excellent also in productivity from this. If the coupler 2 is prepared, the subsequent work only needs to be performed by cutting the deformed reinforcing bar 1 and rolling the male screw portion 1c, and can also be performed at a construction site.
  • the threaded reinforcing bar joint of the deformed reinforcing bar is coupled to the male threaded portion 1b, 1b of each reinforcing bar 1, 1 in the threaded reinforcing bar joint of the first embodiment described above with reference to FIGS. 1A to 3D.
  • a pair of lock nuts 3, 3 are provided in contact with the end surfaces.
  • the outer peripheral surface of the lock nut 3 may be circular or polygonal.
  • the length L1 of the male screw portion 1c is, for example, a length that allows the lock nut 3 and the coupler 2 to escape to one male screw portion 1c.
  • This embodiment is the same as the first embodiment except for matters to be specifically described.
  • compressive force can be transmitted as follows. This will be described with reference to FIGS. 6A and 6B.
  • a tensile force (indicated by a solid arrow in the figure) acts on the reinforcing bars 1 and 1 on both sides, the surface 1ca on the coupler 2 side of the thread of the male threaded part 1c of the reinforcing bar 1 causes the female threaded part 2a of the coupler 2 to A tensile force is transmitted to the surface 2aa on the screw cylinder center side in the screw thread.
  • the tensile force is directly transmitted from one reinforcing bar 1 to the nut 2 and is transmitted to the other reinforcing bar 1, and the meshing strength of the lock nut 3 does not affect the transmission of the tensile force.
  • a compressive force (indicated by a dashed arrow in the figure) acts on the reinforcing bars 1 and 1 on both sides, the female threaded part 3a of the lock nut 3 from the surface 1cb on the anti-coupler side of the thread of the male threaded part 1c of the reinforcing bar 1 Compressive force is transmitted to the surface 3aa on the screw cylinder side in the thread.
  • the transmitted compressive force is transmitted to the coupler 2 from the contact surface between the lock nut 3 and the coupler 2. That is, the compressive force is transmitted from one reinforcing bar 1 to the other reinforcing bar 1 through the lock nut 3, the coupler 2, and the other lock nut 3.
  • the width C of the lock nut 3 is set to a length that can ensure the compression strength required for the reinforcing bar joint. It should be noted that the compression strength required for the reinforced joint is about half of the compression strength compared to the yield strength. For this reason, the fastening length of the lock nut 3 may be shorter than the fastening length to the coupler 2. From this point of view, each lock nut 3 has, for example, an axial width that can be screwed into at least two screw threads of the male screw portion 1c. In the case of this embodiment, the requirements of both tensile strength and compression strength can be satisfied as described above.
  • the threaded reinforcing bar joint of the deformed reinforcing bar is the same as the threaded reinforcing bar joint of the first embodiment described above with reference to FIGS. 1A to 3D.
  • Each reinforcing bar 1, 1 has a node 1ba, but the longitudinal direction of the rib 1bb and the like. It consists of a deformed bar which does not have a ridge extending in the direction.
  • the male screw portion 1c is formed of a rolled screw, and as a lower cut, a round process is performed as shown in FIG. 9C, as described with reference to FIG. 3C.
  • This embodiment provides the following advantages compared to the first embodiment.
  • Conventional deformed reinforcing bars called bamboo rebars are generally composed of a round shaft-shaped reinforcing bar body and joints / ribs, but the ribs also contribute to the tensile strength and account for about 4%.
  • the rib is interrupted at the thread groove portion, and the tensile strength that contributes to the cross-sectional area of the rib 1bb is reduced. Thereby, there exists a concern that the external thread part 1c may become a local weak part of tensile strength.
  • the tensile strength is improved by work hardening, and the problem of strength reduction due to the formation of the male screw portion 1c does not substantially occur. It is desirable to ensure the strength.
  • the embodiment of FIGS. 7 to 10B further secures the strength by slightly increasing the diameter of the reinforcing bar as follows. That is, a reinforcing bar having a large diameter of the reinforcing bar main body 1a is used corresponding to the cross-sectional area of the rib 1bb in the first embodiment.
  • the diameter of the rebar main body 1 a is 17.88 and the rib 1 bb has a trapezoidal cross-sectional shape as shown in FIGS. 11A and 11B.
  • the upper base is 3.5, the lower base is 4.5, and the height is 1.4.
  • the unit is mm. Units are the same or less, in the case of the area which is mm 2.
  • the diameter of the rebar main body 1a is 18.28 mm.
  • the diameter of the reinforcing bar main body 1a is changed from 17.88 to 18.28, so that the rib is not formed and the reinforcing bar main body 1a is shifted to the reinforcing bar main body 1a.
  • deletion by screw processing is eliminated, and the performance as a joint further improves.
  • FIGS. 12 and 13 show a threaded reinforcing bar joint according to the fourth embodiment, which uses the reinforcing bar 1 in the embodiment of FIGS. 7 to 10B, and uses the lock nut 3 as in the embodiment of FIGS. 4 to 6B.
  • An example used is shown. In this embodiment, other matters are the same as those described above with reference to FIGS. 4 to 6B.
  • the reinforcing bar 1 has flat belt-like flat portions 4 over the entire length in the axial direction at two locations on the outer peripheral surface that are 180 ° apart from each other.
  • the belt-like flat portion 4 has a shape in which a cross section perpendicular to the axial direction of the reinforcing bar 1 is a straight line that is a partial arc of a circle forming the outer peripheral surface of the screw body 1a.
  • the width of the node 1ba of the reinforcing bar 1 is widened.
  • the width d1 of the general portion (rebar main body 1a) of the belt-like flat portion 4 is equal to or larger than the base end width of the rib 1bb.
  • the node portion 1ba is discontinuous at two locations in the circumferential direction by forming the belt-like flat portion 4 as described above.
  • FIG. 14C shows a modification of the reinforcing bar 1 and will be described later.
  • FIG. 19 A method for manufacturing the reinforcing bar 1 having the belt-like flat portion 4 will be described.
  • an intermediate rebar material W1 (FIGS. 15A and 15B) having a node 1ba on the outer periphery of a round shaft-shaped reinforcing bar main body 1a is replaced with a pair of rolling rolls 11 from a round shaft-shaped reinforcing bar material W0. , 11 is obtained by hot rolling (rolling process).
  • the rib 1bb is inevitably generated over the entire length of the intermediate rebar material W1 due to the gap between the pair of rolling rolls 11 and 11.
  • the ribs 1bb on both side surfaces are scraped off from the heated intermediate rebar material W1 formed in the rolling process by the rib removing tool 14 installed at the subsequent stage of the rolling roll 11, and 180 ° apart from each other on the outer peripheral surface. It is processed into a thread processing material reinforcing bar W2 (FIGS. 16A and 16B) having the belt-like flat portion 4 at two places (rib removing process).
  • the rib removing tool 14 is a plate-like or lump-like tool having a straight tip, and if installed at a fixed position, the rib 1bb is scraped along with the feeding of the intermediate reinforcing bar material W1.
  • the feeding is performed by, for example, a roll that rotationally drives a part of the guide rolls 12 and 13.
  • These guide rolls 12 and 13 are arranged along the rebar feed direction before and after the rolling roll 11.
  • the threading material rebar W2 having the belt-like flat portion 4 is cut to a certain length with a straight material, but there are cases where the fine material is manufactured as a coil-shaped material.
  • the long threaded material reinforcing bar W2 prepared in this way is used by cutting it to an arbitrary length as shown in FIG. 17 at a bar arrangement site or a factory, for example (cutting process).
  • the cut circular material rebar W2 is subjected to the above-mentioned circular processing, and the node portion 1ba becomes a portion 1ba 'having a low protruding height as shown in FIG.
  • the broken line in the figure shows the node portion 1ba in the state before processing the perfect circle in this portion 1ba '.
  • the male threaded portion 1c is processed for the length range of the threaded material rebar W2 that has been subjected to the circular processing in the same manner as described in the first embodiment (male thread rolling process). .
  • the reinforcing bar 1 having the male screw portion 1c has the belt-like flat portion 4 and does not have a protruding portion such as a rib continuing in the longitudinal direction. Therefore, compared with what was screw-processed to the deformed reinforcing bar which has the said rib, the cross-sectional area by the cross-sectional defect
  • the reinforcing bar By setting the reinforcing bar to have a large diameter corresponding to the cross-sectional area of the rib, even if there is no rib, the same proof strength as that of the reinforcing bar with the rib is secured.
  • the cross-sectional area of the rib 1bb is about 4% of the total cross-sectional area, and by using a correspondingly large diameter reinforcing bar, the same proof strength as that of the reinforcing bar with the rib is ensured.
  • the male screw portion 1c is a rolled screw as in this embodiment, a cross-sectional defect such as cutting does not occur, and the other part of the entire rebar circumference has a large diameter due to plastic flow. There is little decline. Moreover, if it is a rolled screw, plastic hardening occurs in the male screw rolling process, and the yield strength is improved. Therefore, in practice, by setting the thickness and the reinforcing bar 1 so as to compensate for a part of the cross-sectional area difference of about 4%, the proof strength equivalent to that of the reinforcing bar with ribs is ensured.
  • the reinforcing bar 1 having the node portion 1ba and the male screw portion 1c is manufactured, even if the rib 1bb occurs when the node portion 1ba is formed by rolling, the rib-shaped flat portion is removed by removing the rib 1bb.
  • the reinforcing bar 1 with the external thread 1c can be manufactured using a deformed reinforcing bar by general rolling as a raw material.
  • the removal of the rib 1bb can be obtained by forming the belt-like flat portion 4 by scraping the rib 1bb from the heated intermediate rebar material W1 formed in the rolling process for obtaining the node 1ba. A process such as cutting is unnecessary, and it can be easily and efficiently removed.
  • the strip-shaped flat portion 4 is provided on the reinforcing bar 1.
  • FIG. 14C for example, even if a reinforcing bar that does not have the rib 1bb is used, It is possible to reduce the difference in yield strength between the portion where the male screw portion 1c is formed in the reinforcing bar 1 and the general portion where there is no male screw portion 1c. If only the rib is eliminated, that is, if there is no projecting portion extending along the longitudinal direction, there is no change in the cross-sectional area before and after the rolling of the screw, and there is no problem even if the node 1ba extends. In the reinforcing bar 1 of the example of FIG.
  • the reinforcing bar body 1a is a perfect circle over the entire circumference, and the node part 1ba has two discontinuous parts 1baa in the circumferential direction.
  • the rolling equipment has a special specification for forming the node 1ba by rolling, but the rib removing process by scraping is unnecessary.
  • a lock nut may be provided as in the embodiment of FIG. good.
  • the reinforcing bars 1 and 1 on both sides have the same configuration, but the reinforcing bars 1 and 1 on both sides may not have the same diameter, and either one of the reinforcing bars 1 is an example shown in FIG.
  • a round shaft may be used instead of a deformed reinforcing bar.
  • a reinforcing bar 1A that is one size larger is used. By using the reinforcing bar 1A that is one size larger, a decrease in the rigidity of the male screw portion 1c is avoided.
  • a diameter-enlarged head 6 for imparting fixing force is formed by attaching a diameter-enlarged head imparting component 61 to the male threaded portion 1c of the reinforcing bar 1 obtained by processing the male threaded portion 1c through the screw hole 61a.
  • the male screw portion 1c of the reinforcing bar 1 in the figure may be formed for a reinforcing bar joint, or may be formed short for mounting the enlarged diameter head imparting component 61.
  • one end of the reinforcing bar 1 may be connected to another reinforcing bar with the screw-type reinforcing bar joint shown in FIGS. 1A and 1B, and the diameter-enlarged head giving component 61 may be attached to the other end.
  • the diameter-enlarged head imparting component 61 has a plate shape having a screw hole 61a, and the outer peripheral shape may be circular as shown in FIG. 22A or rectangular as shown in FIG. 22B.
  • the end portion of the reinforcing bar 1 is formed in a U-shape or L in order to secure a fixing force in a pillar when, for example, a reinforcing bar of a concrete part that becomes a beam is embedded in a concrete part that becomes a column. It is often bent and embedded in a letter shape. However, if there are many such bent portions of the reinforcing bars, the arrangement of the bars in the column becomes complicated. Therefore, an enlarged head having an enlarged diameter is formed at the end of the reinforcing bar, and fixing force is secured instead of a U-shaped or L-shaped bent portion.
  • the part is manufactured by plastically deforming the end of the reinforcing bar by high-frequency induction or the like, equipment and labor are required in the manufacturing process.
  • the enlarged-diameter head 6 is formed by screwing the enlarged-diameter head-providing component 61 shown in FIGS. 21 to 22B, no special equipment is required and it is easy and simple. An enlarged head 6 can be formed.
  • the reinforcing bars 1 may be those shown in FIG. 7 or FIGS. 14A to 14C.
  • the present invention is not limited to the above embodiment, and various additions, changes, or deletions are possible without departing from the gist of the present invention. Therefore, such a thing is also included in the scope of the present invention.

Abstract

This rebar joint connects together a pair of rebars (1, 1), which are deformed rebars having a ridge (1b) in the outer periphery of the rebar main body (1a). The rebar joint has a cylindrical coupler (2) which screws onto an external thread (1c, 1c) of both the bars (1, 1). Regarding the external thread (1c) of each rebar (1), the minor diameter (D3) is less than the rebar main body outer diameter (D1), and the major diameter (D32, D32') is greater than the rebar main body outer diameter (D1) and smaller than the maximum diameter (D2). The hardness of the external thread (1c) is greater than that of other parts of the rebar (1) due to work hardening during screw formation by rolling. A lock nut may also be provided.

Description

異形鉄筋のねじ式鉄筋継手およびその製造方法Threaded bar joint of deformed bar and method for manufacturing the same 関連出願Related applications
　この出願は、２０１６年１０月１３日出願の特願２０１６－２０１７４８の優先権を主張するものであり、その全体を参照により本願の一部をなすものとして引用する。 This application claims the priority of Japanese Patent Application No. 2016-201748 filed on Oct. 13, 2016, which is incorporated herein by reference in its entirety.
　この発明は、鉄筋コンクリートに用いられる異形鉄筋のねじ式鉄筋継手およびその製造方法に関する。 [Technical Field] The present invention relates to a deformed reinforcing bar screw-type reinforcing bar joint used for reinforced concrete and a manufacturing method thereof.
　鉄筋コンクリートにおいて、鉄筋には一般的に定着性に優れることから異形鉄筋が用いられる。異形鉄筋を接続する鉄筋継手として、重ね継手など種々の形式のものがあり、配筋構造の簡素化や工期の短縮を図ったものとして、ねじ式鉄筋継手がある。ねじ式鉄筋継手において、鉄筋に単に雄ねじ部を切削加工で形成した場合、断面欠損により耐力が低下するため、鉄筋に大径部を形成しておき、この大径部に雄ねじを転造するものが提案されている（例えば、特許文献１）。この提案例では、ロックナットを設けることで、ガタを無くすことについても提案されている。 In reinforced concrete, deformed reinforcing bars are generally used as reinforcing bars because of their excellent fixing properties. There are various types of reinforcing bar joints that connect deformed reinforcing bars, such as lap joints, and threaded reinforcing bar joints that simplify the bar arrangement and shorten the construction period. In threaded rebar joints, when the male thread part is simply formed on the rebar by cutting, the yield strength decreases due to the cross-sectional defect, so a large diameter part is formed in the rebar, and the male thread is rolled to this large diameter part. Has been proposed (for example, Patent Document 1). In this proposed example, it is also proposed to eliminate play by providing a lock nut.
特許第５８６９７１６号公報Japanese Patent No. 5869716
　特許文献１により提案された鉄筋継手は、鉄筋に大径部を設けておき、この大径部に雄ねじを加工することから、雄ねじ部の耐力に優れるという利点を持つ。しかし、前記大径部の形成が必要になることから、製造コストが高くなる。鉄筋素材への前記大径部の形成は、異形鉄筋の節やリブのロール成形時に一緒に行うと、製造コストの増加はある程度抑えられるが、十分ではない。また、ロール成形によると、前記鉄筋の大径部は、ロール径に応じた一定ピッチで形成されるが、多少のピッチのずれが生じる。そのため、前記大径部の長さ方向の中央で切断して一対の雄ねじ部を得るための鉄筋端部の大径部を得るにつき、位置調整が必要であり、量産するにつき生産性が低下する。 The reinforcing bar joint proposed by Patent Document 1 has an advantage that the male screw part is excellent in yield strength because a large diameter part is provided in the reinforcing bar and a male screw is processed in the large diameter part. However, since the large-diameter portion needs to be formed, the manufacturing cost increases. If the large-diameter portion is formed on the reinforcing bar material at the time of roll forming of the deformed reinforcing bar nodes and ribs, an increase in manufacturing cost can be suppressed to some extent, but it is not sufficient. Further, according to roll forming, the large diameter portion of the reinforcing bar is formed at a constant pitch according to the roll diameter, but a slight pitch shift occurs. Therefore, it is necessary to adjust the position for obtaining the large diameter portion of the reinforcing bar end portion for obtaining a pair of male screw portions by cutting at the center in the length direction of the large diameter portion, and the productivity is reduced as the mass production is performed. .
　この発明の目的は、生産性に優れ、かつ雄ねじ部の加工による耐力低下の実用上の問題が生じず、必要な耐力が得られる異形鉄筋のねじ式鉄筋継手およびその製造方法を提供することである。 An object of the present invention is to provide a threaded reinforcing bar joint of a deformed reinforcing bar and a method of manufacturing the same, which is excellent in productivity and does not cause a practical problem of yield strength reduction due to processing of a male screw part. is there.
　この発明の第１の異形鉄筋のねじ式鉄筋継手は、一対の鉄筋が両鉄筋の端部に設けられ雄ねじ部に螺合するねじ筒状のカプラーで接続され、前記一対のうちの一方または両方の鉄筋は、丸軸状の鉄筋本体の外周に、長手方向に間隔を開けて複数の節部を有し、かつ長手方向に延びる突条を有する異形鉄筋である異形鉄筋のねじ式鉄筋継手において、
　前記一方または両方の鉄筋の端部に、ねじ溝径が前記鉄筋本体よりも細い雄ねじ部を有し、この雄ねじ部は、前記節部に相当する幅の複数箇所がねじ山径の太い部分、残りが、前記突条と同じ周方向箇所を除いてねじ山径の細い部分であって、両部分のねじ溝径は互いに同じであり、前記ねじ山径の細い部分のねじ溝深さが、ねじ山径の太い部分のねじ溝深さの７０％以上であり、前記ねじ山径の太い部分のねじ山径が、前記鉄筋の前記鉄筋本体よりも太くかつ前記突条を含む最大径よりも細く、前記雄ねじ部の硬さが前記鉄筋の他の部分よりも硬くまたは引張強度が強く、前記両鉄筋の前記雄ねじ部に螺合する筒状のカプラーを備えることを特徴とする。 The threaded reinforcing bar joint of the first deformed reinforcing bar according to the present invention has a pair of reinforcing bars connected to each other by a threaded cylindrical coupler that is provided at the ends of both reinforcing bars and is screwed into the male threaded part, and one or both of the pair In the threaded rebar joint of a deformed rebar, the rebar is a deformed rebar having a plurality of nodes spaced apart in the longitudinal direction on the outer periphery of a round shaft-shaped rebar main body and having a protrusion extending in the longitudinal direction. ,
The end portion of the one or both reinforcing bars has a male threaded portion whose thread groove diameter is narrower than that of the reinforcing bar main body, and the male threaded portion has a portion having a large thread diameter at a plurality of locations corresponding to the node portions, The rest is a portion with a small thread diameter except for the same circumferential location as the ridge, the thread groove diameters of both portions are the same, and the thread groove depth of the portion with the thin thread diameter is 70% or more of the thread groove depth of the thick part of the thread diameter, and the thread diameter of the thick part of the thread diameter is thicker than the reinforcing bar main body of the reinforcing bar and includes the ridge. It is thin, and the male screw part is harder than other parts of the reinforcing bar or has a higher tensile strength, and includes a cylindrical coupler that is screwed into the male screw part of both reinforcing bars.
　この構成によると、一対の鉄筋の雄ねじ部をカプラーにねじ込むことで両鉄筋の接続が行え、一般の鉄筋継手と同様に、配筋の簡素化、工期の短縮が図れる。前記雄ねじ部は、ねじ溝径が鉄筋本体よりも細く、ねじ山径が鉄筋本体よりも太くて最大径よりも細い径であるため、素材となる異形鉄筋に下加工を施さずにそのまま、または真円加工程度の下加工を施すだけで、形成できる。太径化等の大がかりな下加工を施すことなく、異形鉄筋にねじ加工を施すことで雄ねじ部が形成されるため、生産性に優れる。雄ねじ部のねじ溝径が鉄筋本体よりも細いため、継手部における鉄筋の耐引張力等の耐力の低下が懸念されるが、雄ねじ部の硬さが他の部分よりも硬いため、耐力の低下が補え、十分な耐力が得られる。雄ねじ部の溝加工による耐力低下を補う為に必要となる硬さを硬くまたは強くする程度は、雄ねじ部の転造により得られる加工硬化（塑性硬化とも呼ばれる）の程度で足りる。そのため、異形鉄筋にそのまま雄ねじ部を転造すれば、雄ねじ部に必要な硬さも得られる。このため、雄ねじ部の硬さを高めるための専用の工程は不要であり、このことからも生産性に優れる。前記カプラーを準備しておけば、後の作業は、異形鉄筋の切断および雄ねじ部の転造だけで済み、建築現場で行うこともできる。 According to this configuration, both the reinforcing bars can be connected by screwing the male threaded part of a pair of reinforcing bars into the coupler, and the arrangement of the reinforcing bars can be simplified and the construction period can be shortened as in the case of a general reinforcing bar joint. Since the male thread portion has a thread groove diameter thinner than that of the reinforcing bar main body and a thread diameter larger than that of the reinforcing bar main body and smaller than the maximum diameter, the deformed reinforcing bar used as a material is not subjected to a lower process, or It can be formed simply by applying a sub-process of round processing. Since the male threaded portion is formed by threading the deformed reinforcing bar without subjecting it to a large downsizing such as increasing the diameter, the productivity is excellent. Since the thread groove diameter of the male thread part is narrower than the main body of the reinforcing bar, there is a concern that the strength of the joint part such as tensile strength of the reinforcing bar will be reduced, but the strength of the male thread part is harder than other parts, so the yield strength is reduced. Can be compensated for and sufficient proof stress can be obtained. The degree of hardness or strength required to compensate for the decrease in yield strength due to the groove processing of the male screw portion is sufficient to be the work hardening (also called plastic hardening) obtained by rolling the male screw portion. Therefore, if a male thread part is rolled to a deformed reinforcing bar as it is, the hardness required for the male thread part can also be obtained. For this reason, the process for exclusive use for raising the hardness of an external thread part is unnecessary, and it is excellent also in productivity from this. If the coupler is prepared, the subsequent work only needs to be performed by cutting the deformed reinforcing bar and rolling the male screw part, and can also be performed at the construction site.
　この発明の他の異形鉄筋のねじ式鉄筋継手は、一対の鉄筋が両鉄筋の端部に設けられ雄ねじ部に螺合するねじ筒状のカプラーで接続され、前記一対のうちの一方または両方の鉄筋が異形鉄筋である異形鉄筋のねじ式鉄筋継手において、
　前記一方または両方の鉄筋は、丸軸状の鉄筋本体の外周に長手方向に延びる突条を有せず長手方向に間隔を開けて複数の節部を有する異形鉄筋であり、
前記一方または両方の鉄筋の端部に、ねじ溝径が前記鉄筋本体よりも細い雄ねじ部を有し、この雄ねじ部は、前記節部に相当する幅の複数箇所がねじ山径の太い部分、残りがねじ山径の細い部分であって、両部分のねじ溝径は互いに同じであり、前記ねじ山径の細い部分のねじ溝深さが、ねじ山径の太い部分のねじ溝深さの７０％以上であり、前記ねじ山径の太い部分のねじ山径が、前記鉄筋の前記鉄筋本体よりも太くかつ前記突条を含む最大径よりも細く、前記雄ねじ部の硬さが前記鉄筋の他の部分よりも硬くまたは引張強度が強く、前記両鉄筋の前記雄ねじ部に螺合する筒状のカプラーを備えることを特徴とする。 Another embodiment of the threaded reinforcing bar joint of the deformed reinforcing bar according to the present invention includes a pair of reinforcing bars connected to each other by a threaded cylindrical coupler that is provided at the ends of both reinforcing bars and screwed into the male threaded portion. In the threaded rebar joint of deformed rebar where the rebar is a deformed rebar,
The one or both reinforcing bars are deformed reinforcing bars having a plurality of nodes spaced apart in the longitudinal direction without having protrusions extending in the longitudinal direction on the outer circumference of the round shaft-shaped reinforcing bar body,
The end portion of the one or both reinforcing bars has a male threaded portion whose thread groove diameter is narrower than that of the reinforcing bar main body, and the male threaded portion has a portion having a large thread diameter at a plurality of locations corresponding to the node portions, The remainder is a portion having a small thread diameter, the thread groove diameters of both portions being the same, and the thread groove depth of the portion having the thin thread diameter is equal to the thread groove depth of the portion having a large thread diameter. 70% or more, the thread diameter of the thick part of the thread diameter is thicker than the rebar main body of the rebar and smaller than the maximum diameter including the protrusions, and the hardness of the male thread portion is It is characterized by comprising a cylindrical coupler that is harder or has a higher tensile strength than the other parts and that is screwed into the male threaded portions of both reinforcing bars.
　この構成によると、第１の異形鉄筋のねじ式鉄筋継手につき説明した作用効果に加え、次の作用効果が得られる。
従来の竹節鉄筋と呼ばれる異形鉄筋は、一般に丸軸状の鉄筋本体と節部・リブで構成されているが、前記リブも引張耐力に寄与しており、大凡４％程度を占める。この異形鉄筋に前記雄ねじ部を加工した場合、ねじ溝部分で前記リブが途切れ、リブの断面積により寄与する分の引張耐力が低下する。これにより雄ねじ部が引張耐力の局部的な弱部となる。
これにつき、上記のように鉄筋を長手方向に延びるリブ等の突条を有しない形状とすることで、雄ねじ部が耐力の局部的な弱部となることが回避される。
単に前記突条を無くすと、その分だけ、鉄筋の全体の引張耐力が低下するが、前記雄ねじ部は、転造による加工硬化等で引張強度が強くなっているため、必要な強度が保たれる。さらに確実なものとするには、前記リブ等の突条の断面積に相当する分だけ鉄筋本体の径が大きな鉄筋を用いれば良い。 According to this structure, in addition to the effect demonstrated about the thread type reinforcement joint of the 1st deformed reinforcing bar, the following effect is obtained.
Conventional deformed reinforcing bars called bamboo rebars are generally composed of a round shaft-shaped reinforcing bar body and joints / ribs, but the ribs also contribute to the tensile strength and account for about 4%. When the male thread portion is machined on the deformed reinforcing bar, the rib is interrupted at the thread groove portion, and the tensile strength that contributes to the cross-sectional area of the rib is reduced. As a result, the male screw portion becomes a local weak portion of the tensile strength.
In this regard, it is possible to avoid the male screw portion being a locally weak portion of the proof stress by making the reinforcing bar into a shape that does not have protrusions such as ribs extending in the longitudinal direction as described above.
If the ridges are simply eliminated, the tensile strength of the entire rebar will be reduced by that amount, but the male threaded portion has increased tensile strength due to work hardening by rolling, etc., so the necessary strength was maintained. It is. In order to ensure further reliability, it is only necessary to use a reinforcing bar whose diameter is larger than that of the ribs and the like.
　前記長手方向に延びる突条を有しない異形鉄筋を用いる場合に、前記一方または両方の鉄筋は、外周面における互いに１８０°離れた２箇所に、軸方向に垂直な断面が、前記鉄筋本体の外周面を成す円の一部の弧となる直線である帯状平坦部を、軸方向の全長に渡って有するようにしても良い。
前記節部を有する異形鉄筋を製造するにつき、一般的な圧延によると、対向する圧延ロール間の隙間によって前記リブとなる突条が生じる。しかし、圧延時にリブが生じても、そのリブを落として前記帯状平坦部とすれば良く、これにより、前記節部の加工を、一般的な節部およびリブを有する異形鉄筋とする圧延ロール設備を用いて行っても、前記長手方向に延びる突条を有しない節つきの異形鉄筋となる。 In the case of using a deformed reinforcing bar that does not have a protrusion extending in the longitudinal direction, the one or both reinforcing bars have two sections 180 ° apart from each other on the outer peripheral surface, and the cross section perpendicular to the axial direction is the outer periphery of the reinforcing bar main body. You may make it have the strip | belt-shaped flat part which is a straight line used as the one part arc of the circle which comprises a surface over the full length of an axial direction.
When manufacturing a deformed reinforcing bar having the node, according to general rolling, a protrusion that becomes the rib is generated by a gap between opposing rolling rolls. However, even if a rib is generated during rolling, it is only necessary to drop the rib to form the belt-like flat portion, whereby a rolling roll facility in which the processing of the node portion is a deformed reinforcing bar having a general node portion and a rib. Even if it carries out using, it becomes a deformed reinforcing bar with a knot which does not have a ridge extending in the longitudinal direction.
　この発明において、前記鉄筋の前記雄ねじ部に螺合して前記カプラーの端面に当接するロックナットを有するようにしても良い。
　このようにロックナットを設けた場合、ねじ結合部分におけるガタがなくなり、また引張力の作用時と圧縮力の作用時とで、雄ねじ部とカプラーの雌ねじ部のねじ山同士が接触する面が変わらず、引張耐力および圧縮耐力の両方の要件を充足できる。 In this invention, you may make it have a lock nut screwed together in the said external thread part of the said reinforcing bar, and contact | abutted to the end surface of the said coupler.
When the lock nut is provided in this way, there is no backlash at the screw coupling portion, and the surface where the threads of the male screw portion and the female screw portion of the coupler come into contact with each other changes when the tensile force is applied and when the compressive force is applied. Therefore, the requirements of both tensile strength and compression strength can be satisfied.
　この発明の異形鉄筋のねじ式鉄筋継手の製造方法は、この発明の前記いずれかの構成の異形鉄筋のねじ式鉄筋継手を製造する方法であって、鉄筋本体の外周に突条を有する異形鉄筋を任意の長さに切断する切断過程と、この切断された鉄筋の端部に拡径加工を施すことなく雄ねじ部を転造によって加工する雄ねじ転造過程と、この雄ねじ部が加工された一対の鉄筋の前記雄ねじ部に螺合させるカプラーを準備する過程とを含む。
　この方法によると、異形鉄筋を任意の長さに切断し、雄ねじ部を転造するだけで、ねじ式鉄筋継手を構成する雄ねじ部付きの鉄筋が得られる。雄ねじ部は転造により加工するため、ねじ加工に伴う断面欠損を補うために雄ねじ部に要求される硬さについても、転造に伴う加工硬化によって得られ、特に硬さを高めるための専用の工程は不要である。そのため優れた生産性が得られる。 The manufacturing method of the threaded reinforcing bar joint of the deformed reinforcing bar of the present invention is a method of manufacturing the threaded reinforcing bar joint of the deformed reinforcing bar having any one of the configurations of the present invention, and has a deformed reinforcing bar having a protrusion on the outer periphery of the reinforcing bar main body. A cutting process in which the male screw part is cut into an arbitrary length, a male screw rolling process in which the male screw part is processed by rolling without subjecting the end of the cut reinforcing bar to a diameter expansion process, and a pair in which the male screw part is processed Preparing a coupler to be screwed into the male thread portion of the reinforcing bar.
According to this method, it is possible to obtain a reinforcing bar with a male screw part constituting a threaded reinforcing bar joint by simply cutting the deformed reinforcing bar into an arbitrary length and rolling the male screw part. Since the male threaded part is processed by rolling, the hardness required for the male threaded part to compensate for the cross-sectional defects associated with threading is also obtained by work hardening associated with rolling, especially for increasing the hardness. No process is required. Therefore, excellent productivity can be obtained.
　この発明の異形鉄筋のねじ式鉄筋継手の製造方法において、前記切断過程の後に前記鉄筋の端部における前記雄ねじ部を形成する長さ範囲に、前記突条が略無くなる程度の外径の真円加工を施す真円加工過程を含み、この真円加工過程の後、前記転造を行うようにしても良い。
　異形鉄筋にそのまま転造を施しても、必要な雄ねじ部は得られる。しかし、異形鉄筋は節部やリブ等の突条を有するため、転造によってバリを生じる場合がある。真円加工の後に転造を行うことで、前記バリの発生が解消され綺麗に雄ねじ部が得られる。バリの発生が解消されるための真円加工は、前記節部やリブ等の突条を除く程度で良く、前記突条の基端部が残る程度であっても良い。それ以上に細くすることは、細径化による耐力低下のために好ましくない。 In the manufacturing method of the threaded reinforcing bar joint of the deformed reinforcing bar according to the present invention, a perfect circle having an outer diameter to the extent that the protrusion is substantially eliminated in a length range in which the male thread portion is formed at the end of the reinforcing bar after the cutting process. A rolling process may be included, and the rolling may be performed after the machining process.
Even if the deformed reinforcing bar is rolled as it is, the necessary male screw part can be obtained. However, because the deformed reinforcing bar has protrusions such as nodes and ribs, burrs may be generated by rolling. By performing rolling after the perfect circle processing, the generation of the burr is eliminated and a male screw part can be obtained beautifully. The perfect circle processing for eliminating the generation of burrs may be to the extent that the protrusions such as the joints and ribs are removed, and the base end of the protrusions may remain. It is not preferable to make it thinner than that because the yield strength is reduced by reducing the diameter.
　請求の範囲および／または明細書および／または図面に開示された少なくとも２つの構成のどのような組合せも、本発明に含まれる。特に、請求の範囲の各請求項の２つ以上のどのような組合せも、本発明に含まれる。 Any combination of at least two configurations disclosed in the claims and / or the specification and / or drawings is included in the present invention. In particular, any combination of two or more of each claim in the claims is included in the present invention.
　本発明は、添付の図面を参考にした以下の好適な実施形態の説明からより明瞭に理解されるであろう。しかしながら、実施形態および図面は単なる図示および説明のためのものであり、本発明の範囲を定めるために利用されるべきものではない。本発明の範囲は添付の請求の範囲によって定まる。添付図面において、複数の図面における同一の部品番号は、同一または相当部分を示す。
この発明の第１の実施形態に係る異形鉄筋のねじ式鉄筋継手の断面図である。 図１ＡのＩＢ部分の拡大断面図である。 同ねじ式鉄筋継手の分解状態の正面図である。 同ねじ式鉄筋継手の製造過程の説明図である。 同ねじ式鉄筋継手の製造過程の説明図である。 同ねじ式鉄筋継手の製造過程の説明図である。 同ねじ式鉄筋継手の製造過程の説明図である。 この発明の第２の実施形態に係る異形鉄筋のねじ式鉄筋継手の断面図である。 同ねじ式鉄筋継手の分解状態の正面図である。 同ねじ式鉄筋継手の作用説明図である。 同ねじ式鉄筋継手の作用説明図である。 この発明の第３の実施形態に係る異形鉄筋のねじ式鉄筋継手の断面図である。 同ねじ式鉄筋継手の分解状態の正面図である。 同ねじ式鉄筋継手の製造過程の説明図である。 同ねじ式鉄筋継手の製造過程の説明図である。 同ねじ式鉄筋継手の製造過程の説明図である。 同ねじ式鉄筋継手の製造過程の説明図である。 同実施形態で用いる異形鉄筋の形状および寸法例を示す正面図である。 同実施形態で用いる異形鉄筋の形状および寸法例を示す側面図である。 第１の実施形態で用いる異形鉄筋の形状および寸法例を示す正面図である。 同実施形態で用いる異形鉄筋の形状および寸法例を示す側面図である。 この発明の第４の実施形態に係る異形鉄筋のねじ式鉄筋継手の断面図である。 同ねじ式鉄筋継手の分解状態の正面図である。 この発明の第５の実施形態に係る異形鉄筋のねじ式鉄筋継手の断面図である。 図１４ＡのＸＩＶＢ－ＸＩＶＢ断面図である。 異形鉄筋の変形例における図１４Ｂに相当する断面図である。 第５の実施形態に係る異形鉄筋のねじ式鉄筋継手の製造過程の工程説明図である。 図１５ＡのＸＶＢ－ＸＶＢ断面図である。 同ねじ式鉄筋継手の製造過程の工程説明図である。 図１６ＡのＸＶＩＢ－ＸＶＩＢ断面図である。 同ねじ式鉄筋継手の製造過程の工程説明図である。 同ねじ式鉄筋継手の製造過程の工程説明図である。 同ねじ式鉄筋継手における鉄筋の圧延およびリブ除去過程の説明図である。 この発明の第６の実施形態に係る異形鉄筋のねじ式鉄筋継手の断面図である。 同ねじ式鉄筋継手の鉄筋を用いて定着板をねじ結合で取り付けた例を示す断面図である。 同定着板の一例を示す正面図である。 同定着板の一例を示す正面図である。 The present invention will be more clearly understood from the following description of preferred embodiments with reference to the accompanying drawings. However, the embodiments and drawings are merely for illustration and description, and should not be used to define the scope of the present invention. The scope of the invention is defined by the appended claims. In the accompanying drawings, the same part numbers in a plurality of drawings indicate the same or corresponding parts.
It is sectional drawing of the screw-type reinforcing bar joint of the deformed reinforcing bar which concerns on 1st Embodiment of this invention. It is an expanded sectional view of the IB part of FIG. 1A. It is a front view of the decomposition | disassembly state of the screw-type rebar joint. It is explanatory drawing of the manufacturing process of the screw-type rebar joint. It is explanatory drawing of the manufacturing process of the screw-type rebar joint. It is explanatory drawing of the manufacturing process of the screw-type rebar joint. It is explanatory drawing of the manufacturing process of the screw-type rebar joint. It is sectional drawing of the screw-type reinforcing bar joint of the deformed reinforcing bar which concerns on 2nd Embodiment of this invention. It is a front view of the decomposition | disassembly state of the screw-type rebar joint. It is operation | movement explanatory drawing of the screw-type reinforcing bar joint. It is operation | movement explanatory drawing of the screw-type reinforcing bar joint. It is sectional drawing of the screw-type reinforcing bar joint of the deformed reinforcing bar which concerns on 3rd Embodiment of this invention. It is a front view of the decomposition | disassembly state of the screw-type rebar joint. It is explanatory drawing of the manufacturing process of the screw-type rebar joint. It is explanatory drawing of the manufacturing process of the screw-type rebar joint. It is explanatory drawing of the manufacturing process of the screw-type rebar joint. It is explanatory drawing of the manufacturing process of the screw-type rebar joint. It is a front view which shows the shape and dimension example of a deformed reinforcing bar used in the embodiment. It is a side view which shows the shape and dimension example of a deformed reinforcing bar used in the embodiment. It is a front view which shows the shape and dimension example of a deformed reinforcing bar used in 1st Embodiment. It is a side view which shows the shape and dimension example of a deformed reinforcing bar used in the embodiment. It is sectional drawing of the screw-type reinforcing bar joint of the deformed reinforcing bar which concerns on 4th Embodiment of this invention. It is a front view of the decomposition | disassembly state of the screw-type rebar joint. It is sectional drawing of the screw-type reinforcing bar joint of the deformed reinforcing bar which concerns on 5th Embodiment of this invention. FIG. 14B is a cross-sectional view taken along the line XIVB-XIVB of FIG. 14A. It is sectional drawing equivalent to FIG. 14B in the modification of a deformed reinforcing bar. It is process explanatory drawing of the manufacturing process of the screw-type reinforcing bar joint of the deformed reinforcing bar which concerns on 5th Embodiment. It is XVB-XVB sectional drawing of FIG. 15A. It is process explanatory drawing of the manufacturing process of the screw-type rebar joint. FIG. 16B is a cross-sectional view taken along the line XVIB-XVIB of FIG. 16A. It is process explanatory drawing of the manufacturing process of the screw-type rebar joint. It is process explanatory drawing of the manufacturing process of the screw-type rebar joint. It is explanatory drawing of the rolling of a reinforcing bar and the rib removal process in the screw-type reinforcing bar joint. It is sectional drawing of the screw-type reinforcing bar joint of the deformed reinforcing bar which concerns on 6th Embodiment of this invention. It is sectional drawing which shows the example which attached the fixing board by the screw coupling | bonding using the reinforcing bar of the screw-type reinforcing bar joint. It is a front view showing an example of the fixing plate. It is a front view showing an example of the fixing plate.
　この発明の第１の実施形態を図１Ａないし図３Ｄと共に説明する。この異形鉄筋のねじ式鉄筋継手は、一対の鉄筋１，１を接続する鉄筋継手であって、互いに接続される一対の鉄筋の対向する端部に雄ねじ部１ｃを有し、両鉄筋１，１の前記雄ねじ部１ｃ，１ｃに渡ってカプラー２が螺合している。両雄ねじ部１ｃ，１ｃは、この実施形態では互いに同じ方向のねじであるが、互いに逆ねじであっても良い。カプラー２は、前記各雄ねじ部１ｃ，１ｃに螺合する雌ねじ部２ａが形成された鋼製のねじ筒状である。カプラー２の外周面は、円筒面状であっても、また長さ方向の一部または全体が、ねじ締め用の工具（図示せず）に係合させる多角形や、一部に平坦面を持つ形状であっても良い。 A first embodiment of the present invention will be described with reference to FIGS. 1A to 3D. The threaded reinforcing bar joint of the deformed reinforcing bar is a reinforcing bar joint for connecting a pair of reinforcing bars 1 and 1, and has a male threaded portion 1 c at the opposite end of the pair of reinforcing bars connected to each other. The coupler 2 is screwed over the male screw portions 1c and 1c. Both male screw portions 1c and 1c are screws in the same direction in this embodiment, but may be reverse screws. The coupler 2 has a steel screw cylinder shape in which a female screw portion 2a that is screwed into the male screw portions 1c and 1c is formed. The outer peripheral surface of the coupler 2 may be a cylindrical surface, or a part or the whole of the length direction may be a polygon that engages with a screw tightening tool (not shown) or a flat surface in part. It may have a shape.
　各鉄筋１は、丸軸状の鉄筋本体１ａの外周面に突条１ｂを有する異形鉄筋である。この実施形態では、突条１ｂは、鉄筋長手方向に一定間隔置きで円周方向に延びる節部１ｂａと、長手方向に延びるリブ１ｂｂとでなる。リブ１ｂｂは、２本が鉄筋本体１ａの１８０°離れた位置に設けられている。各節部１ｂａは、全周に続く円環状である。節部１ｂａは、２本のリブ１ｂｂ，１ｂｂ間に延びる半周ずつが、交互に鉄筋長手方向に並ぶ形状であっても良い。また、突条１ｂは、上記のような節部１ｂａとリブ１ｂｂとでなる形状に限らず、１本で螺旋状に延びる形状や、２本の螺旋状とされて相互の交差部の間が菱形状となる形状等であっても良い。 Each reinforcing bar 1 is a deformed reinforcing bar having a protrusion 1b on the outer peripheral surface of a round shaft-shaped reinforcing bar main body 1a. In this embodiment, the protrusion 1b is composed of a node 1ba extending in the circumferential direction at regular intervals in the longitudinal direction of the reinforcing bar and a rib 1bb extending in the longitudinal direction. Two ribs 1bb are provided at a position 180 degrees away from the reinforcing bar main body 1a. Each node 1ba has an annular shape that continues around the entire circumference. The node portion 1ba may have a shape in which half circumferences extending between the two ribs 1bb and 1bb are alternately arranged in the longitudinal direction of the reinforcing bar. Further, the protrusion 1b is not limited to the shape formed by the node portion 1ba and the rib 1bb as described above, and is formed in a spiral shape by one or two spirals, and the space between the intersecting portions is It may be a diamond shape or the like.
　各鉄筋１，１の雄ねじ部１ｃ，１ｃは、転造ねじであり、加工硬化（塑性硬化とも呼ばれる）によって、鉄筋１，１の他の部分よりも少なくとも表層部の硬さが硬くなっている。 The male screw portions 1c and 1c of the reinforcing bars 1 and 1 are rolling screws, and at least the surface layer is harder than other portions of the reinforcing bars 1 and 1 by work hardening (also called plastic hardening). .
　雄ねじ部１ｃにおける径寸法の関係を説明すると、鉄筋１の雄ねじ部１ｃは、後述のように節部１ｂａとリブ１ｂｂにねじ加工の精度の向上のために、節部１ｂａおよびリブ１ｂｂの基端が残る程度の真円加工を行ったうえでねじ加工を施すため、次のように節部１ｂａのある箇所とない箇所で寸法が異なっている。なお、リブ１ｂｂのある箇所は節部１ｂａのある箇所と同じであるため、全周で考えると節部１ｂａのある軸方向幅部分と節部１ｂａのない軸方向幅部分とで雄ねじ部１ｃの径寸法は同じである。 The relationship between the diameters of the male screw portion 1c will be described. The male screw portion 1c of the reinforcing bar 1 has a base end of the node portion 1ba and the rib 1bb in order to improve the accuracy of threading the node portion 1ba and the rib 1bb as will be described later. In order to perform threading after performing round processing to such an extent that remains, the dimensions are different depending on whether or not the node 1ba is present as follows. In addition, since the location with the rib 1bb is the same as the location with the node 1ba, considering the entire circumference, the axial width portion with the node 1ba and the axial width portion without the node 1ba have the male screw portion 1c. The diameter dimensions are the same.
　径寸法の関係を具体的に説明する。真円加工の真円の直径Ｄ５（図１Ｂ）が鉄筋本体１ａの外径Ｄ１よりも大きいため、真円加工を行う長さ範囲における鉄筋本体１ａの箇所は、未加工部分として残る。雄ねじ部１ｃは、ねじ溝径Ｄ３１が鉄筋本体の外径Ｄ１よりも小さく、鉄筋本体１ａ、およびこれよりも大径の節部１ｂａの真円加工された部分１ｂａ′に渡って形成される。そのため、鉄筋本体１ａの箇所と節部１ｂａが真円加工された部分１ｂａ′とで、図１Ｂのように、雄ねじ部１ｃのねじ山径が異なっている。ねじ溝径はどちらも同じＤ３１である。鉄筋本体１ａに形成される雄ねじ部１ｃにおけるねじ溝深さｈ１は、節部１ｂａの真円加工された部分１ｂａ′のねじ溝深さｈ０に対して、例えば７５～８０％、この例では７５％とされている。なお、このねじ溝深さの割合ｈ１／ｈ０は、７０％以上有れば、雄ねじ部１ｃにおける鉄筋本体１ａにねじ加工された箇所も、鉄筋継手としての締結に支障がないことがシミュレーションにより確認されている。 The relationship between the diameters will be specifically described. Since the diameter D5 (FIG. 1B) of the true circle processed by the perfect circle is larger than the outer diameter D1 of the reinforcing bar main body 1a, the portion of the reinforcing bar main body 1a in the length range where the circular processing is performed remains as an unprocessed portion. Male screw portion 1c, a screw groove diameter D3 1 is smaller than the outer diameter D1 of the reinforcing bar body, is formed over the circularity machining portion 1ba 'knuckles 1ba diameter larger reinforcing bar body 1a, and from this . Therefore, the thread diameter of the male screw portion 1c differs between the location of the reinforcing bar main body 1a and the portion 1ba 'in which the node portion 1ba is processed into a perfect circle as shown in FIG. 1B. The screw groove diameter is the same D3 1 both. The thread groove depth h1 in the male thread portion 1c formed in the reinforcing bar main body 1a is, for example, 75 to 80%, 75 in this example, with respect to the thread groove depth h0 of the rounded portion 1ba 'of the node portion 1ba. %. In addition, if the ratio h1 / h0 of the thread groove depth is 70% or more, it is confirmed by simulation that there is no hindrance to fastening as a reinforcing bar joint even in a portion threaded on the reinforcing bar main body 1a in the male screw portion 1c. Has been.
　鉄筋１の各部の径寸法の一例を示すと、呼び径がＤ１９の鉄筋において、Ｍ２０でピッチ２．５の雄ねじ部１ｃを加工した場合、鉄筋本体１ａの外径Ｄ１が１７．８８、最大径Ｄ２（節部１ｂａの外径）が２０．６８、ねじ山径Ｄ３２が１９．６７４、ねじ有効径Ｄ３０が１８．０５、ねじ溝径Ｄ３１が１６．６０７である（単位:mm）。 An example of the diameter of each part of the reinforcing bar 1 is as follows. In the reinforcing bar having a nominal diameter of D19, when the male threaded part 1c having a pitch of 2.5 is processed at M20, the outer diameter D1 of the reinforcing bar body 1a is 17.88, the maximum diameter. D2 (node portion outer diameter of 1ba) is 20.68, crest diameter D3 2 is 19.674, screw effective diameter D3 0 is 18.05, the screw groove diameter D3 1 is 16.607 (unit: mm) .
　雄ねじ部１ｃの長さＬ１は、カプラー２に対する必要ねじ込み長さだけあれば良いが、図１Ａおよび図１Ｂに想像線で示すように、カプラー２の全体をねじ込める長さとしておくことが好ましい。これにより、鉄筋接続作業時に、いずれか一方の鉄筋１の雄ねじ部１ｃにカプラー２の全体をねじ込んでおき、両鉄筋１，１の端面を合わせた後にカプラー２をねじ戻しながら他方の鉄筋１の雄ねじ部１ｃに螺合させることができる。そのため、鉄筋１を引っ張りながら螺子込むなどの必要がなくて現場接続の作業性が向上する。雄ねじ部１ｃのねじ溝の断面形状は、三角形状であっても、台形であっても良い。 The length L1 of the male screw portion 1c need only be a necessary screwing length with respect to the coupler 2, but it is preferable to set the length of the entire coupler 2 to be screwed as shown by an imaginary line in FIGS. 1A and 1B. As a result, during rebar connection work, the entire coupler 2 is screwed into the male threaded portion 1c of either one of the reinforcing bars 1, and after the end surfaces of both reinforcing bars 1 and 1 are aligned, the coupler 2 is unscrewed while the other reinforcing bar 1 is unscrewed. It can be screwed into the male screw portion 1c. Therefore, it is not necessary to screw the reinforcing bar 1 while pulling it, and the workability of the on-site connection is improved. The cross-sectional shape of the thread groove of the male screw portion 1c may be triangular or trapezoidal.
　図３Ａないし図３Ｂと共に、この異形鉄筋のねじ式鉄筋継手の製造方法を説明する。なお、同図とは別にカプラー２は準備しておく。
　図３Ａは、素材となる異形鉄筋である鉄筋１を示す。この鉄筋１を、建設現場または工場等で、必要とされる任意の長さに切断する（切断過程）（図３Ｂ）。この切断された鉄筋１の端部における、雄ねじ部１ｃを形成する長さ範囲の部分に、真円加工を施す（真円加工過程）（図３Ｃ）。この真円加工は、前記のように、鉄筋１の節部１ｂａおよびリブ１ｂｂからなる突条１ｂの基端が残る程度の略無くなる程度の外径Ｄ５（図１Ｂ）の真円に切削を行う加工であり、節部１ｂａは低い突出高さの部分１ｂａ′となる。外径Ｄ５は、鉄筋本体１ａの外径Ｄ１よりも僅かに大きい。ねじ加工に伴う若干の径の変化があるため、外径Ｄ５は、雄ねじ部１ｃのねじ山径Ｄ３２と異なっている。なお、前記外径Ｄ５は、鉄筋本体外径Ｄ１と同じかまたは僅かに小さくても良い。
このように鉄筋１の真円加工が施された部分に、雄ねじ部１ｃ（有効径Ｄ３０）を転造により形成する（雄ねじ転造過程）（図３Ｄ）。転造による雄ねじ部１ｃの形成の場合、組成流動によりねじ山径Ｄ３２は前記真円加工の外径Ｄ５よりも大きくなり、有効径Ｄ３０が前記真円加工の外径Ｄ５となる。この転造は、例えば鉄筋１の外周に嵌まる転造工具（図示せず）または一対の対向する転造ロールからなる転造設備（図示せず）を用いて、冷間、温間、または熱間で行う。この転造は、より詳しくは、例えばねじ加工を３点で行う加工、いわゆる３点転造とする。 A method for manufacturing the threaded reinforcing bar joint of the deformed reinforcing bar will be described with reference to FIGS. 3A to 3B. Separately, the coupler 2 is prepared.
FIG. 3A shows a reinforcing bar 1 which is a deformed reinforcing bar as a material. This rebar 1 is cut into a desired length at a construction site or factory (cutting process) (FIG. 3B). A round process is performed on a portion of the cut end of the rebar 1 in a length range that forms the male screw part 1c (round process) (FIG. 3C). In this round process, as described above, a round is cut into a perfect circle having an outer diameter D5 (FIG. 1B) such that the base end of the protrusion 1b composed of the node 1ba and the rib 1bb of the reinforcing bar 1 remains. This is processing, and the node portion 1ba becomes a portion 1ba 'having a low protruding height. The outer diameter D5 is slightly larger than the outer diameter D1 of the reinforcing bar main body 1a. Since there is a change in some sizes over threaded, the outside diameter D5 is different from the crest diameter D3 2 of the male screw portion 1c. The outer diameter D5 may be the same as or slightly smaller than the reinforcing bar main body outer diameter D1.
In this way, the male thread portion 1c (effective diameter D3 0 ) is formed by rolling on the portion of the reinforcing bar 1 that has been subjected to the perfect circle processing (male thread rolling process) (FIG. 3D). For formation of the male screw portion 1c by rolling, crest diameter D3 2 is the larger than the outer diameter D5 of a perfect circle processing, the effective diameter D3 0 is the outer diameter D5 of the perfect circle machining the composition flow. This rolling is performed by using a rolling tool (not shown) fitted on the outer periphery of the reinforcing bar 1 or a rolling facility (not shown) composed of a pair of opposing rolling rolls, for example, cold, warm, or Do it hot. More specifically, this rolling is, for example, a so-called three-point rolling process in which screw machining is performed at three points.
　このように雄ねじ部１ｃの転造を行うことで、雄ねじ部１ｃが加工硬化によって硬くなる。また、雄ねじ部１ｃのねじ溝径Ｄ３１が鉄筋本体１ａの外径Ｄ１よりも細くなり、かつねじ山径Ｄ３２′は転造時の盛り上がりによって鉄筋本体１ａの外径Ｄ１よりも太くなる。
　なお、前記真円加工（図３Ｃ）は必ずしも行わなくても良い。
　また、雄ねじ部１ｃの真円加工および転造を行う長さは、長さ調整用として長くしておき、配筋の現場で使用箇所に応じて雄ねじ部１ｃを切断し、鉄筋継手に用いるようにしても良い。これにより施工性が向上する。 By rolling the male screw portion 1c in this way, the male screw portion 1c is hardened by work hardening. Further, the screw groove diameter D3 1 of the male screw portion 1c is thinner than the outer diameter D1 of the reinforcing bar body 1a, and becomes thicker than the outer diameter D1 of the reinforcing bar body 1a crest diameter D3 2 'by swelling during rolling.
The perfect circle processing (FIG. 3C) is not necessarily performed.
Further, the length of the round processing and rolling of the male threaded portion 1c is made longer for length adjustment, and the male threaded portion 1c is cut at the location of the bar arrangement in accordance with the place of use, and used for the reinforcing bar joint. Anyway. This improves the workability.
　この構成の鉄筋継手によると、一対の鉄筋１，１の雄ねじ部１ｃ，１ｃをカプラー２にねじ込むことで両鉄筋１，１の接続が行え、一般の鉄筋継手と同様に、配筋の簡素化、工期の短縮が図れる。前記雄ねじ部１ｃは、ねじ溝径Ｄ３１が鉄筋本体１ａの外径Ｄ１よりも細く、ねじ山径Ｄ３２が鉄筋本体１ａの外径Ｄ１よりも太く、また最大径Ｄ２よりも細い。そのため、素材となる異形鉄筋１に下加工を施さずにそのまま、または真円加工による下加工を施すだけで、雄ねじ部１ｃを形成できる。太径化等の大がかりな下加工を施すことなく、異形鉄筋１にねじ加工を施すことで雄ねじ部１ｃが形成されるため、生産性に優れる。雄ねじ部１ｃのねじ溝径Ｄ３１が鉄筋本体１ａの外径Ｄ１よりも細いため、継手部における鉄筋の耐引張力等の耐力の低下が懸念されるが、雄ねじ部１ｃの硬さが他の部分よりも硬いため、耐力の低下が補え、十分な耐力が得られる。 According to the rebar joint of this structure, both the rebars 1 and 1 can be connected by screwing the male thread portions 1c and 1c of the pair of rebars 1 and 1 into the coupler 2, and simplification of the bar arrangement as in the case of a general rebar joint. The construction period can be shortened. The male screw portion 1c, thinner than the outer diameter D1 of the screw groove diameter D3 1 rebar body 1a, thicker than the outer diameter D1 of the crest diameter D3 2 rebar body 1a, also narrower than the maximum diameter D2. For this reason, the male threaded portion 1c can be formed as it is without subjecting the deformed reinforcing bar 1 as a raw material to a lower processing as it is or by performing a round processing by a perfect circle processing. Since the male threaded portion 1c is formed by threading the deformed reinforcing bar 1 without performing a large down-sizing such as increasing the diameter, the productivity is excellent. For screw the groove diameter D3 1 of the male screw portion 1c narrow than the outer diameter D1 of the reinforcing bar body 1a, a scratch tension, etc. of the reinforcing bars in the joint portion but decrease in strength is feared, the hardness of the male screw portion 1c of the other Since it is harder than the part, it can compensate for a decrease in yield strength, and a sufficient yield strength can be obtained.
　雄ねじ部１ｃの溝加工による耐力低下を補う為に必要となる硬さを硬くする程度は、雄ねじ部１ｃの転造により得られる加工硬化の程度で足りる。そのため、異形鉄筋１にそのまま雄ねじ部を転造すれば、雄ねじ部１ｃに必要な硬さも得られる。このため、雄ねじ部１ｃの硬さを高めるための専用の工程は不要であり、このことからも生産性に優れる。前記カプラー２を準備しておけば、後の作業は、異形鉄筋１の切断および雄ねじ部１ｃの転造だけで済み、建築現場で行うこともできる。 The degree of hardening required to compensate for the decrease in yield strength due to the groove processing of the male screw portion 1c is sufficient for the work hardening obtained by rolling the male screw portion 1c. Therefore, if a male thread part is rolled to the deformed reinforcing bar 1 as it is, the hardness required for the male thread part 1c can also be obtained. For this reason, the process for exclusive use for raising the hardness of the external thread part 1c is unnecessary, and it is excellent also in productivity from this. If the coupler 2 is prepared, the subsequent work only needs to be performed by cutting the deformed reinforcing bar 1 and rolling the male screw portion 1c, and can also be performed at a construction site.
　図４～図６Ｂは、この発明の第２の実施形態を示す。この異形鉄筋のねじ式鉄筋継手は、図１Ａ～図３Ｄと共に前述した第１の実施形態のねじ式鉄筋継手において、各鉄筋１，１の前記雄ねじ部１ｂ，１ｂにそれぞれ螺合してカプラー２の端面に当接する一対のロックナット３，３が設けられている。ロックナット３の外周面は、円形であっても、多角形であっても良い。この実施形態において、雄ねじ部１ｃの長さＬ１は、例えばロックナット３とカプラー２の全体を片方の雄ねじ部１ｃに逃がしておける長さとされる。この実施形態は、特に説明する事項の他は第１の実施形態と同様である。 4 to 6B show a second embodiment of the present invention. The threaded reinforcing bar joint of the deformed reinforcing bar is coupled to the male threaded portion 1b, 1b of each reinforcing bar 1, 1 in the threaded reinforcing bar joint of the first embodiment described above with reference to FIGS. 1A to 3D. A pair of lock nuts 3, 3 are provided in contact with the end surfaces. The outer peripheral surface of the lock nut 3 may be circular or polygonal. In this embodiment, the length L1 of the male screw portion 1c is, for example, a length that allows the lock nut 3 and the coupler 2 to escape to one male screw portion 1c. This embodiment is the same as the first embodiment except for matters to be specifically described.
　この構成のねじ式鉄筋継手の場合、次のように圧縮力を伝達することができる。これにつき、図６Ａおよび図６Ｂを用いて説明する。両側の鉄筋１，１に引張力（同図に実線の矢印で示す）が作用したときは、鉄筋１の雄ねじ部１ｃのねじ山におけるカプラー２側の面１ｃａから、カプラー２の雌ねじ部２ａのねじ山におけるねじ筒中心側の面２ａａに引張力が伝達される。従って、引張力は片方の鉄筋１からナット２に直接に伝達され、もう片方の鉄筋１に伝わることになり、ロックナット３の噛み合いの強度は引張力の伝達に影響しない。両側の鉄筋１，１に圧縮力（同図に破線の矢印で示す）が作用したときは、鉄筋１の雄ねじ部１ｃのねじ山における反カプラー側の面１ｃｂから、ロックナット３の雌ねじ部３ａのねじ山におけるねじ筒側の面３ａａに圧縮力が伝達される。この伝達された圧縮力は、ロックナット３とカプラー２との接触面からカプラー２に伝わる。すなわち、圧縮力は、一方の鉄筋１から、ロックナット３、カプラー２、および他方のロックナット３を介して他方の鉄筋１に伝わる。 In the case of this type of threaded steel rebar joint, compressive force can be transmitted as follows. This will be described with reference to FIGS. 6A and 6B. When a tensile force (indicated by a solid arrow in the figure) acts on the reinforcing bars 1 and 1 on both sides, the surface 1ca on the coupler 2 side of the thread of the male threaded part 1c of the reinforcing bar 1 causes the female threaded part 2a of the coupler 2 to A tensile force is transmitted to the surface 2aa on the screw cylinder center side in the screw thread. Therefore, the tensile force is directly transmitted from one reinforcing bar 1 to the nut 2 and is transmitted to the other reinforcing bar 1, and the meshing strength of the lock nut 3 does not affect the transmission of the tensile force. When a compressive force (indicated by a dashed arrow in the figure) acts on the reinforcing bars 1 and 1 on both sides, the female threaded part 3a of the lock nut 3 from the surface 1cb on the anti-coupler side of the thread of the male threaded part 1c of the reinforcing bar 1 Compressive force is transmitted to the surface 3aa on the screw cylinder side in the thread. The transmitted compressive force is transmitted to the coupler 2 from the contact surface between the lock nut 3 and the coupler 2. That is, the compressive force is transmitted from one reinforcing bar 1 to the other reinforcing bar 1 through the lock nut 3, the coupler 2, and the other lock nut 3.
　このため、ロックナット３の幅Ｃは、鉄筋継手に要求される圧縮耐力が確保できる長さとされる。なお、鉄筋継手に要求される圧縮耐力は、耐圧縮力は降伏点強度に比べて半分程度で足りる。そのため、ロックナット３の締結長さは、カプラー２への締結長さに比べて短い寸法で足りる。この観点で、各ロックナット３は、例えば、少なくとも雄ねじ部１ｃの２つのねじ山に螺合可能な軸方向幅とされる。この実施形態の場合、上記のように、引張耐力および圧縮耐力の両方の要件を充足できる。 For this reason, the width C of the lock nut 3 is set to a length that can ensure the compression strength required for the reinforcing bar joint. It should be noted that the compression strength required for the reinforced joint is about half of the compression strength compared to the yield strength. For this reason, the fastening length of the lock nut 3 may be shorter than the fastening length to the coupler 2. From this point of view, each lock nut 3 has, for example, an axial width that can be screwed into at least two screw threads of the male screw portion 1c. In the case of this embodiment, the requirements of both tensile strength and compression strength can be satisfied as described above.
　図７～図１０Ｂは、この発明の第３の実施形態を示す。この異形鉄筋のねじ式鉄筋継手は、図１Ａ～図３Ｄと共に前述した第１の実施形態のねじ式鉄筋継手において、各鉄筋１，１が、節部１ｂａを有するが、リブ１ｂｂ等の長手方向に延びる突条を有しない異形鉄筋からなる。雄ねじ部１ｃは、転造ねじからなり、その下削りとして、図３Ｃで説明したと同様に、図９Ｃに示すように真円加工を行う。この場合、リブは有しないので、基本的には、節部１ｂａだけに真円加工を施す。鉄筋１の鉄筋本体１ａは、設定する雄ねじ部１ｃの有効半径内であれば、多少の真円度は転造により補正される。圧延工程でリブ１ｂｂがわずかに発生する場合もあるが、この場合、全断面積に及ぼす影響は小さく、問題は生じない。
　この実施形態は、特に説明する事項の他は、前記第１の実施形態と同様であり、重複する説明を省略するが、寸法例については、次のように若干異ならせている。 7 to 10B show a third embodiment of the present invention. The threaded reinforcing bar joint of the deformed reinforcing bar is the same as the threaded reinforcing bar joint of the first embodiment described above with reference to FIGS. 1A to 3D. Each reinforcing bar 1, 1 has a node 1ba, but the longitudinal direction of the rib 1bb and the like. It consists of a deformed bar which does not have a ridge extending in the direction. The male screw portion 1c is formed of a rolled screw, and as a lower cut, a round process is performed as shown in FIG. 9C, as described with reference to FIG. 3C. In this case, since there is no rib, basically, a round process is performed only on the node 1ba. If the reinforcing bar main body 1a of the reinforcing bar 1 is within the effective radius of the male screw portion 1c to be set, some roundness is corrected by rolling. The rib 1bb may be slightly generated in the rolling process, but in this case, the influence on the total cross-sectional area is small and no problem occurs.
This embodiment is the same as the first embodiment except for matters to be specifically described, and overlapping description is omitted. However, the dimensional examples are slightly different as follows.
　この実施形態は、第１の実施形態に比べて、次の利点が得られる。従来の竹節鉄筋と呼ばれる異形鉄筋は、一般に丸軸状の鉄筋本体と節部・リブで構成されているが、前記リブも引張耐力に寄与しており、大凡４％程度を占める。この異形鉄筋に、第１の実施形態のように雄ねじ部１ｃを加工した場合、ねじ溝部分で前記リブが途切れ、リブ１ｂｂの断面積により寄与する分の引張耐力が低下する。これにより雄ねじ部１ｃが引張耐力の局部的な弱部となる懸念がある。第１の実施形態では、雄ねじ部１ｃを転造により加工しているので、加工硬化により引張強度が向上していて、実質上、雄ねじ部１ｃの形成による強度低下の問題は生じないが、より強度確保をより確実にすることが望ましい。
図７～図１０Ｂの実施形態は、次のように、鉄筋径を僅かに大きくすることで、強度確保をさらに確実なものとしている。すなわち、第１の実施形態におけるリブ１ｂｂの断面積に相当する分だけ、鉄筋本体１ａの径が大きな鉄筋を用いている。 This embodiment provides the following advantages compared to the first embodiment. Conventional deformed reinforcing bars called bamboo rebars are generally composed of a round shaft-shaped reinforcing bar body and joints / ribs, but the ribs also contribute to the tensile strength and account for about 4%. When the male threaded portion 1c is processed on the deformed reinforcing bar as in the first embodiment, the rib is interrupted at the thread groove portion, and the tensile strength that contributes to the cross-sectional area of the rib 1bb is reduced. Thereby, there exists a concern that the external thread part 1c may become a local weak part of tensile strength. In the first embodiment, since the male screw portion 1c is processed by rolling, the tensile strength is improved by work hardening, and the problem of strength reduction due to the formation of the male screw portion 1c does not substantially occur. It is desirable to ensure the strength.
The embodiment of FIGS. 7 to 10B further secures the strength by slightly increasing the diameter of the reinforcing bar as follows. That is, a reinforcing bar having a large diameter of the reinforcing bar main body 1a is used corresponding to the cross-sectional area of the rib 1bb in the first embodiment.
　寸法例を図１０Ａないし図１１Ｂと共に説明する。第１の実施形態では、例えばＤ１９の鉄筋１を用いる場合、図１１Ａおよび図１１Ｂに示すように、規格どおりに、鉄筋本体１ａの直径１７．８８であり、リブ１ｂｂが台形状断面形状であって上底３．５、下底４．５、高さ１．４とされている。単位はいずれもｍｍである。単位は以下同様であり、面積の場合はｍｍ２である。
　鉄筋本体１ａの断面積Ａ０、リブ断面積Ａ１，全体の断面積Ａとすると、
　　　Ａ０＝π（１７．８８）２＝２５１．０９
　　　Ａ１＝（３．５+４．５）１．４/２×２≒１１．２
　　　Ａ＝Ａ０+Ａ１＝２５１．０９+１１．２＝２６２．２９
　　　Ａ１/　Ａ＝０．０４３　（４．３％）
である。
　そこで、この実施形態では鉄筋本体１ａの直径を１８．２８mmとしている。この場合、鉄筋本体１ａの断面積ＡＡは、
　　　ＡＡ　＝　π（１８．２８/２）２＝２６２．４５
である。
　このように鉄筋本体１ａの直径を１７．８８→１８．２８とすることで、リブは形成せず、鉄筋本体１ａへ移行している。これにより、ねじ加工による断面欠損は解消し、継手としての性能がさらに向上する。 A dimension example will be described with reference to FIGS. 10A to 11B. In the first embodiment, for example, when using a D19 rebar 1, the diameter of the rebar main body 1 a is 17.88 and the rib 1 bb has a trapezoidal cross-sectional shape as shown in FIGS. 11A and 11B. The upper base is 3.5, the lower base is 4.5, and the height is 1.4. The unit is mm. Units are the same or less, in the case of the area which is mm 2.
Assuming that the cross-sectional area A 0 , rib cross-sectional area A 1 , and overall cross-sectional area A of the rebar main body 1a
A 0 = π (17.88) 2 = 251.09
A 1 = (3.5 + 4.5) 1.4 / 2 × 2≈11.2
A = A 0 + A 1 = 251.09 + 11.2 = 262.29
A 1 / A = 0.043 (4.3 %)
It is.
Therefore, in this embodiment, the diameter of the rebar main body 1a is 18.28 mm. In this case, the cross-sectional area A A rebar body 1a is
A A = π (18.28 / 2) 2 = 262.45
It is.
Thus, the diameter of the reinforcing bar main body 1a is changed from 17.88 to 18.28, so that the rib is not formed and the reinforcing bar main body 1a is shifted to the reinforcing bar main body 1a. Thereby, the cross-sectional defect | deletion by screw processing is eliminated, and the performance as a joint further improves.
　図１２，１３は、第４の実施形態に係るねじ式鉄筋継手であって、図７～図１０Ｂの実施形態における鉄筋１を用い、図４～６Ｂの実施形態と同様に、ロックナット３を用いた例を示す。この実施形態において、その他の事項は図４～６Ｂと共に前述した例と同様である。 12 and 13 show a threaded reinforcing bar joint according to the fourth embodiment, which uses the reinforcing bar 1 in the embodiment of FIGS. 7 to 10B, and uses the lock nut 3 as in the embodiment of FIGS. 4 to 6B. An example used is shown. In this embodiment, other matters are the same as those described above with reference to FIGS. 4 to 6B.
　図１４Ａ～図１９は、第５の実施形態に係るねじ式鉄筋継手およびその製造方法を示す。この実施形態において、特に説明する事項の他は、第１の実施形態と同様である。この実施形態では、前記鉄筋１は、外周面における互いに１８０°離れた２箇所に、平面状の帯状平坦部４を軸方向の全長に渡って有している。図１４Ｂに示すように、帯状平坦部４は、鉄筋１の軸方向に垂直な断面が、ねじ本体１ａの外周面を成す円の一部の弧である直線となる形状である。帯状平坦部４は平面形状であるため、鉄筋１の節部１ｂａの箇所では幅が広がっている。帯状平坦部４の一般部（鉄筋本体１ａ）における幅ｄ１は、前記リブ１ｂｂの基端幅と同じかそれぞれ以上の幅とされている。節部１ｂａは、上記のように帯状平坦部４が形成されることにより、円周方向の２箇所で非連続となっている。
なお、図１４Ｃは、鉄筋１の変形例を示し、後に説明する。 14A to 19 show a threaded reinforcing bar joint and a method for manufacturing the same according to a fifth embodiment. This embodiment is the same as the first embodiment except for matters to be specifically described. In this embodiment, the reinforcing bar 1 has flat belt-like flat portions 4 over the entire length in the axial direction at two locations on the outer peripheral surface that are 180 ° apart from each other. As shown in FIG. 14B, the belt-like flat portion 4 has a shape in which a cross section perpendicular to the axial direction of the reinforcing bar 1 is a straight line that is a partial arc of a circle forming the outer peripheral surface of the screw body 1a. Since the belt-like flat part 4 has a planar shape, the width of the node 1ba of the reinforcing bar 1 is widened. The width d1 of the general portion (rebar main body 1a) of the belt-like flat portion 4 is equal to or larger than the base end width of the rib 1bb. The node portion 1ba is discontinuous at two locations in the circumferential direction by forming the belt-like flat portion 4 as described above.
FIG. 14C shows a modification of the reinforcing bar 1 and will be described later.
　前記帯状平坦部４を有する鉄筋１の製造方法を説明する。先ず図１９に示すように、丸軸状の鉄筋素材Ｗ０から、丸軸状の鉄筋本体１ａの外周に節部１ｂａを有する中間鉄筋素材Ｗ１（図１５Ａおよびず１５Ｂ）を、一対の圧延ロール１１，１１による熱間の圧延で得る（圧延過程）。このとき、中間鉄筋素材Ｗ１には、一対の圧延ロール１１，１１間の隙間により、両側面にリブ１ｂｂが全長に渡り必然的に生じる。 A method for manufacturing the reinforcing bar 1 having the belt-like flat portion 4 will be described. First, as shown in FIG. 19, an intermediate rebar material W1 (FIGS. 15A and 15B) having a node 1ba on the outer periphery of a round shaft-shaped reinforcing bar main body 1a is replaced with a pair of rolling rolls 11 from a round shaft-shaped reinforcing bar material W0. , 11 is obtained by hot rolling (rolling process). At this time, the rib 1bb is inevitably generated over the entire length of the intermediate rebar material W1 due to the gap between the pair of rolling rolls 11 and 11.
　この圧延過程で成形されて来る加熱状態の中間鉄筋素材Ｗ１から、圧延ロール１１の後段に設置されたリブ除去用工具１４により、両側面のリブ１ｂｂを掻き取り、外周面における互いに１８０°離れた２箇所に、前記帯状平坦部４を有するねじ加工用素材鉄筋Ｗ２（図１６Ａおよび図１６Ｂ）に加工される（リブ除去過程）。リブ除去用工具１４は、先端が直線状の板状または塊状等の工具とされ、位置固定に設置しておけば、中間鉄筋素材Ｗ１の送りに伴ってリブ１ｂｂの掻取りが行われる。前記送りは、例えば、案内ロール１２，１３の一部のものを回転駆動させるロールとすることで行われる。これら案内ロール１２，１３は、圧延ロール１１の前後に鉄筋送り方向に沿って並べられている。
　上記の帯状平坦部４を有するねじ加工用素材鉄筋Ｗ２は、直線材で一定長さに切断されるが、細物はコイル状の素材として製造されるケースもある。 The ribs 1bb on both side surfaces are scraped off from the heated intermediate rebar material W1 formed in the rolling process by the rib removing tool 14 installed at the subsequent stage of the rolling roll 11, and 180 ° apart from each other on the outer peripheral surface. It is processed into a thread processing material reinforcing bar W2 (FIGS. 16A and 16B) having the belt-like flat portion 4 at two places (rib removing process). The rib removing tool 14 is a plate-like or lump-like tool having a straight tip, and if installed at a fixed position, the rib 1bb is scraped along with the feeding of the intermediate reinforcing bar material W1. The feeding is performed by, for example, a roll that rotationally drives a part of the guide rolls 12 and 13. These guide rolls 12 and 13 are arranged along the rebar feed direction before and after the rolling roll 11.
The threading material rebar W2 having the belt-like flat portion 4 is cut to a certain length with a straight material, but there are cases where the fine material is manufactured as a coil-shaped material.
　このように準備された長尺のねじ加工用素材鉄筋Ｗ２は、例えば配筋の現場または工場において、任意の長さに、図１７のように切断して使用される（切断過程）。
　この切断したねじ加工用素材鉄筋Ｗ２に、前記真円加工を施し、図１８のように節部１ｂａは低い突出高さの部分１ｂａ′となる。同図の破線は、この部分１ｂａ′における真円加工前の状態の節部１ｂａを示す。
　この真円加工を終えたねじ加工用素材鉄筋Ｗ２における前記真円加工された長さ範囲につき、第１の実施形態で説明したと同様に、前記雄ねじ部１ｃを加工する（雄ねじ転造過程）。 The long threaded material reinforcing bar W2 prepared in this way is used by cutting it to an arbitrary length as shown in FIG. 17 at a bar arrangement site or a factory, for example (cutting process).
The cut circular material rebar W2 is subjected to the above-mentioned circular processing, and the node portion 1ba becomes a portion 1ba 'having a low protruding height as shown in FIG. The broken line in the figure shows the node portion 1ba in the state before processing the perfect circle in this portion 1ba '.
In the same way as described in the first embodiment, the male threaded portion 1c is processed for the length range of the threaded material rebar W2 that has been subjected to the circular processing in the same manner as described in the first embodiment (male thread rolling process). .
　この構成の場合、雄ねじ部１ｃを有する鉄筋１が帯状平坦部４を有し、長手方向に続くリブのような突出部分を有しない。そのため、前記リブを有する異形鉄筋にねじ加工したものに比べ、鉄筋１における雄ねじ部１ｃの形成箇所と雄ねじ部１ｃのない一般部分とで、真円加工やねじ加工に伴う断面欠損による断面積の差が少なく、耐力の差が小さい。このため、実用上、鉄筋継手が鉄筋の局部的な弱部として問題とならない。前記リブの断面積に相当する分だけ大径の鉄筋とすることで、リブがなくても、リブ付きの鉄筋と同等の耐力が確保される。例えば前記リブ１ｂｂの断面積は全断面積の４％程度であり、この分だけ大径の鉄筋とすることで、リブ付きの鉄筋と同等の耐力が確保される。 In this configuration, the reinforcing bar 1 having the male screw portion 1c has the belt-like flat portion 4 and does not have a protruding portion such as a rib continuing in the longitudinal direction. Therefore, compared with what was screw-processed to the deformed reinforcing bar which has the said rib, the cross-sectional area by the cross-sectional defect | deletion accompanying a perfect circle process or a screw process in the formation part of the external thread part 1c in the reinforcing bar 1 and the general part without the external thread part 1c The difference is small and the difference in yield strength is small. For this reason, a rebar joint does not become a problem as a local weak part of a rebar practically. By setting the reinforcing bar to have a large diameter corresponding to the cross-sectional area of the rib, even if there is no rib, the same proof strength as that of the reinforcing bar with the rib is secured. For example, the cross-sectional area of the rib 1bb is about 4% of the total cross-sectional area, and by using a correspondingly large diameter reinforcing bar, the same proof strength as that of the reinforcing bar with the rib is ensured.
　雄ねじ部１ｃがこの実施形態のように転造ねじである場合は、切削加工のような断面欠損を生じず、塑性流動で鉄筋全周のうちの他の部分が大径となって、断面積の低下は少ない。また、転造ねじであると、雄ねじ転造過程で塑性硬化が生じて耐力が向上する。そのため、実際には、前記４％程度の断面積差の一部を補う程度の太さと鉄筋１とすることで、リブ付きの鉄筋と同等の耐力が確保される。 When the male screw portion 1c is a rolled screw as in this embodiment, a cross-sectional defect such as cutting does not occur, and the other part of the entire rebar circumference has a large diameter due to plastic flow. There is little decline. Moreover, if it is a rolled screw, plastic hardening occurs in the male screw rolling process, and the yield strength is improved. Therefore, in practice, by setting the thickness and the reinforcing bar 1 so as to compensate for a part of the cross-sectional area difference of about 4%, the proof strength equivalent to that of the reinforcing bar with ribs is ensured.
　また、製造過程においても、前記節部１ｂａおよび雄ねじ部１ｃを有する鉄筋１を製造するにつき、節部１ｂａの圧延による形成時にリブ１ｂｂが生じても、そのリブ１ｂｂを除去して前記帯状平坦部４とすれば良く、一般的な圧延による異形鉄筋を素材として雄ねじ部１ｃ付きの鉄筋１を製造することができる。
　リブ１ｂｂの除去については、節部１ｂａを得るための圧延過程で成形されて来る加熱状態の中間鉄筋素材Ｗ１からリブ１ｂｂを掻き落とすことにより前記帯状平坦部４を形成することで得られるため、切削等の工程が不要で、簡単に能率良く除去することができる。 Also, in the manufacturing process, when the reinforcing bar 1 having the node portion 1ba and the male screw portion 1c is manufactured, even if the rib 1bb occurs when the node portion 1ba is formed by rolling, the rib-shaped flat portion is removed by removing the rib 1bb. The reinforcing bar 1 with the external thread 1c can be manufactured using a deformed reinforcing bar by general rolling as a raw material.
The removal of the rib 1bb can be obtained by forming the belt-like flat portion 4 by scraping the rib 1bb from the heated intermediate rebar material W1 formed in the rolling process for obtaining the node 1ba. A process such as cutting is unnecessary, and it can be easily and efficiently removed.
　なお、この実施形態では鉄筋１に帯状平坦部４を設けるようにしたが、例えば図１４Ｃに断面を示すように、単に前記リブ１ｂｂを有しない鉄筋を用いても、この実施形態と同様に、鉄筋１における雄ねじ部１ｃの形成箇所と雄ねじ部１ｃのない一般部分との耐力差を少なくすることができる。リブのみ無くせば、すなわち長手方向に沿って延びる突出部分がなければ、ねじの転造前後での断面積の変化はなく、節部１ｂａは伸びても支障がない。図１４Ｃの例の鉄筋１では、鉄筋本体１ａは全周にわたり真円であり、節部１ｂａは円周方向の２か所で途切れ部１ｂａａが生じている。同図のリブを無くすのみとして帯状平坦部を形成しない場合は、圧延により節１ｂａを成形するにつき、圧延設備が特殊な仕様とはなるが、掻き落としによるリブ除去過程は不要である。
　前記鉄筋１に帯状平坦部４を設けたものを用いる場合、または図１４Ｃのように単に前記リブ１ｂｂを有しない鉄筋を用いる場合も、図４の実施形態と同様に、ロックナットを設けても良い。 In this embodiment, the strip-shaped flat portion 4 is provided on the reinforcing bar 1. However, as shown in FIG. 14C, for example, even if a reinforcing bar that does not have the rib 1bb is used, It is possible to reduce the difference in yield strength between the portion where the male screw portion 1c is formed in the reinforcing bar 1 and the general portion where there is no male screw portion 1c. If only the rib is eliminated, that is, if there is no projecting portion extending along the longitudinal direction, there is no change in the cross-sectional area before and after the rolling of the screw, and there is no problem even if the node 1ba extends. In the reinforcing bar 1 of the example of FIG. 14C, the reinforcing bar body 1a is a perfect circle over the entire circumference, and the node part 1ba has two discontinuous parts 1baa in the circumferential direction. When the strip-shaped flat portion is not formed only by eliminating the ribs in the figure, the rolling equipment has a special specification for forming the node 1ba by rolling, but the rib removing process by scraping is unnecessary.
When using the reinforcing bar 1 provided with the belt-like flat portion 4 or when using a reinforcing bar without the rib 1bb as shown in FIG. 14C, a lock nut may be provided as in the embodiment of FIG. good.
　また、前記各実施形態では両側の鉄筋１，１を同じ構成としたが、両側の鉄筋１，１は同径でなくても良く、またいずれか一方の鉄筋１は、例えば図２０に示す例のように異形鉄筋ではなく単に丸軸状であっても良い。この例では１サイズ大きい鉄筋１Ａを用いている。１サイズ大きい鉄筋１Ａを用いることで、雄ねじ部１ｃの剛性低下が回避される。 Further, in each of the embodiments, the reinforcing bars 1 and 1 on both sides have the same configuration, but the reinforcing bars 1 and 1 on both sides may not have the same diameter, and either one of the reinforcing bars 1 is an example shown in FIG. Instead of a deformed reinforcing bar, a round shaft may be used. In this example, a reinforcing bar 1A that is one size larger is used. By using the reinforcing bar 1A that is one size larger, a decrease in the rigidity of the male screw portion 1c is avoided.
　図２１ないし図２２Ｂは、雄ねじ部１ｃを加工した鉄筋１の前記雄ねじ部１ｃに、拡径頭部付与部品６１をそのねじ穴６１ａで取付けて定着力付与用の拡径頭部６を形成した例である。同図の鉄筋１の雄ねじ部１ｃは、鉄筋継手用に形成したものであっても、また拡径頭部付与部品６１の取付用として短く形成したものであっても良い。また、鉄筋１の一端を図１Ａおよび図１Ｂのねじ式鉄筋継手で他の鉄筋と接続し、他端に拡径頭部付与部品６１を取付けても良い。拡径頭部付与部品６１は、ねじ穴６１ａを有する板状とされ、外周形状は、図２２Ａのように円形であっても、図２２Ｂのように矩形であっても良い。 21 to 22B, a diameter-enlarged head 6 for imparting fixing force is formed by attaching a diameter-enlarged head imparting component 61 to the male threaded portion 1c of the reinforcing bar 1 obtained by processing the male threaded portion 1c through the screw hole 61a. It is an example. The male screw portion 1c of the reinforcing bar 1 in the figure may be formed for a reinforcing bar joint, or may be formed short for mounting the enlarged diameter head imparting component 61. Alternatively, one end of the reinforcing bar 1 may be connected to another reinforcing bar with the screw-type reinforcing bar joint shown in FIGS. 1A and 1B, and the diameter-enlarged head giving component 61 may be attached to the other end. The diameter-enlarged head imparting component 61 has a plate shape having a screw hole 61a, and the outer peripheral shape may be circular as shown in FIG. 22A or rectangular as shown in FIG. 22B.
　一般的に、鉄筋１の端部は、例えば梁となるコンクリート部分の鉄筋を柱となるコンクリート部分に内に埋め込むような場合に、柱内で定着力を確保するために、Ｕ字状やＬ字状に屈曲させて埋め込む場合が多い。しかし、このような鉄筋の屈曲部分が多数あると柱内の配筋が煩雑となる。そこで、鉄筋の端部に拡径した拡径頭部を形成し、Ｕ字状やＬ字状の屈曲部分の代わりとして定着力を確保することが行われているが、前記従来の拡径頭部は、鉄筋の端部を高周波誘導等により熱間で塑性変形させて製造することから、製造過程に設備や手間が必要となる。
　このような課題に対して、図２１ないし図２２Ｂの拡径頭部付与部品６１をねじ結合して拡径頭部６を形成する場合、特別な設備が不要で、手間も掛けずに簡単に拡径頭部６を形成することができる。
　なお、図２１ないし図２２Ｂに示す実施形態において、鉄筋１は、図７や、図１４Ａないし図１４Ｃ等に示すものを用いても良い。 In general, the end portion of the reinforcing bar 1 is formed in a U-shape or L in order to secure a fixing force in a pillar when, for example, a reinforcing bar of a concrete part that becomes a beam is embedded in a concrete part that becomes a column. It is often bent and embedded in a letter shape. However, if there are many such bent portions of the reinforcing bars, the arrangement of the bars in the column becomes complicated. Therefore, an enlarged head having an enlarged diameter is formed at the end of the reinforcing bar, and fixing force is secured instead of a U-shaped or L-shaped bent portion. Since the part is manufactured by plastically deforming the end of the reinforcing bar by high-frequency induction or the like, equipment and labor are required in the manufacturing process.
In response to such a problem, when the enlarged-diameter head 6 is formed by screwing the enlarged-diameter head-providing component 61 shown in FIGS. 21 to 22B, no special equipment is required and it is easy and simple. An enlarged head 6 can be formed.
In the embodiment shown in FIGS. 21 to 22B, the reinforcing bars 1 may be those shown in FIG. 7 or FIGS. 14A to 14C.
　本発明は、以上の実施形態に限定されるものでなく、本発明の要旨を逸脱しない範囲内で、種々の追加、変更または削除が可能である。したがって、そのようなものも本発明の範囲内に含まれる。 The present invention is not limited to the above embodiment, and various additions, changes, or deletions are possible without departing from the gist of the present invention. Therefore, such a thing is also included in the scope of the present invention.
１、１Ａ　鉄筋
１ａ　鉄筋本体
１ｂ　突条
１ｂａ　節部
１ｂｂ　リブ
１ｃ　雄ねじ部
２　カプラー
２ａ　雌ねじ部
３　ロックナット
４　帯状平坦部
Ｄ１　鉄筋本体の外径
Ｄ２　最大径
Ｄ３０　ねじ有効径
Ｄ３１　ねじ溝径
Ｄ３２、Ｄ３２′　ねじ山径 DESCRIPTION OF SYMBOLS 1, 1A Reinforcing bar 1a Reinforcing bar main body 1b Projection 1ba Node part 1bb Rib 1c Male thread part 2 Coupler 2a Female thread part 3 Lock nut 4 Strip-shaped flat part D1 Outer diameter of reinforcing bar body D2 Maximum diameter D3 0 Effective thread diameter D3 1 Thread groove diameter D3 2 , D3 2 ′ thread diameter

Claims (6)

  1. 　一対の鉄筋が両鉄筋の端部に設けられ雄ねじ部に螺合するねじ筒状のカプラーで接続され、前記一対のうちの一方または両方の鉄筋は、丸軸状の鉄筋本体の外周に、長手方向に間隔を開けて複数の節部を有し、かつ長手方向に延びる突条を有する異形鉄筋である異形鉄筋のねじ式鉄筋継手において、
    　前記一方または両方の鉄筋の端部に、ねじ溝径が前記鉄筋本体よりも細い雄ねじ部を有し、この雄ねじ部は、前記節部に相当する幅の複数箇所がねじ山径の太い部分、残りが、前記突条と同じ周方向箇所を除いてねじ山径の細い部分であって、両部分のねじ溝径は互いに同じであり、前記ねじ山径の細い部分のねじ溝深さが、ねじ山径の太い部分のねじ溝深さの７０％以上であり、前記ねじ山径の太い部分のねじ山径が、前記鉄筋の前記鉄筋本体よりも太くかつ前記突条を含む最大径よりも細く、前記雄ねじ部の硬さが前記鉄筋の他の部分よりも硬くまたは引張強度が強く、前記両鉄筋の前記雄ねじ部に螺合する筒状のカプラーを備えることを特徴とする異形鉄筋のねじ式鉄筋継手。     A pair of rebars are provided at the ends of both rebars and connected by a threaded cylindrical coupler that is screwed into the male threaded portion, and one or both of the rebars are longitudinally connected to the outer periphery of the round shaft-shaped rebar main body. In a threaded rebar joint of a deformed rebar that is a deformed rebar having a plurality of nodes spaced in the direction and having a ridge extending in the longitudinal direction,
    The end portion of the one or both reinforcing bars has a male threaded portion whose thread groove diameter is narrower than that of the reinforcing bar main body, and the male threaded portion has a portion having a large thread diameter at a plurality of locations corresponding to the node portions, The rest is a portion with a small thread diameter except for the same circumferential location as the ridge, the thread groove diameters of both portions are the same, and the thread groove depth of the portion with the thin thread diameter is 70% or more of the thread groove depth of the thick part of the thread diameter, and the thread diameter of the thick part of the thread diameter is thicker than the reinforcing bar main body of the reinforcing bar and includes the ridge. A deformed reinforcing bar screw characterized by comprising a cylindrical coupler that is thin, has a male screw part harder than other parts of the reinforcing bar or has a higher tensile strength, and is screwed into the male screw part of both reinforcing bars. Reinforcing bar joint.
  2. 　一対の鉄筋が両鉄筋の端部に設けられ雄ねじ部に螺合するねじ筒状のカプラーで接続され、前記一対のうちの一方または両方の鉄筋が異形鉄筋である異形鉄筋のねじ式鉄筋継手において、
    　前記一方または両方の鉄筋は、丸軸状の鉄筋本体の外周に長手方向に延びる突条を有せず長手方向に間隔を開けて複数の節部を有する異形鉄筋であり、
    前記一方または両方の鉄筋の端部に、ねじ溝径が前記鉄筋本体よりも細い雄ねじ部を有し、この雄ねじ部は、前記節部に相当する幅の複数箇所がねじ山径の太い部分、残りがねじ山径の細い部分であって、両部分のねじ溝径は互いに同じであり、前記ねじ山径の細い部分のねじ溝深さが、ねじ山径の太い部分のねじ溝深さの７０％以上であり、前記ねじ山径の太い部分のねじ山径が、前記鉄筋の前記鉄筋本体よりも太くかつ前記突条を含む最大径よりも細く、前記雄ねじ部の硬さが前記鉄筋の他の部分よりも硬くまたは引張強度が強く、前記両鉄筋の前記雄ねじ部に螺合する筒状のカプラーを備えることを特徴とする異形鉄筋のねじ式鉄筋継手。     In a threaded rebar joint of a deformed rebar in which a pair of rebars are provided at the ends of both rebars and are connected by a threaded cylindrical coupler that is screwed into a male thread, and one or both of the rebars are deformed rebars ,
    The one or both reinforcing bars are deformed reinforcing bars having a plurality of nodes spaced apart in the longitudinal direction without having protrusions extending in the longitudinal direction on the outer circumference of the round shaft-shaped reinforcing bar body,
    The end portion of the one or both reinforcing bars has a male threaded portion whose thread groove diameter is narrower than that of the reinforcing bar main body, and the male threaded portion has a portion having a large thread diameter at a plurality of locations corresponding to the node portions, The remainder is a portion having a small thread diameter, the thread groove diameters of both portions being the same, and the thread groove depth of the portion having the thin thread diameter is equal to the thread groove depth of the portion having a large thread diameter. 70% or more, the thread diameter of the thick part of the thread diameter is thicker than the rebar main body of the rebar and smaller than the maximum diameter including the protrusions, and the hardness of the male thread portion is A threaded reinforcing bar joint for deformed reinforcing bars comprising a cylindrical coupler that is harder or has a higher tensile strength than the other parts and is screwed into the male threaded portions of both reinforcing bars.
  3. 　請求項２に記載の異形鉄筋のねじ式鉄筋継手において、前記一方または両方の鉄筋は、外周面における互いに１８０°離れた２箇所に、軸方向に垂直な断面が、前記鉄筋本体の外周面を成す円の一部の弧となる直線である帯状平坦部を、軸方向の全長に渡って有する異形鉄筋のねじ式鉄筋継手。 The threaded reinforcing bar joint of the deformed reinforcing bar according to claim 2, wherein the one or both reinforcing bars have an axial cross section perpendicular to an axial direction at two locations 180 ° apart from each other on the outer peripheral surface. A threaded reinforcing bar joint of a deformed bar having a belt-like flat portion that is a straight line that forms a partial arc of a circle formed over the entire length in the axial direction.
  4. 　請求項１ないし請求項３のいずれか１項に記載の異形鉄筋のねじ式鉄筋継手であって、前記鉄筋の前記雄ねじ部に螺合して前記カプラーの端面に当接するロックナットを有する異形鉄筋のねじ式鉄筋継手。 The deformed reinforcing bar threaded reinforcing bar joint according to any one of claims 1 to 3, wherein the deformed reinforcing bar has a lock nut that is screwed into the male thread portion of the reinforcing bar and abuts against an end face of the coupler. Threaded rebar joint.
  5. 　請求項１ないし請求項４のいずれか１項に記載の異形鉄筋のねじ式鉄筋継手を製造する方法であって、鉄筋本体の外周に突条を有する異形鉄筋を任意の長さに切断する切断過程と、この切断された鉄筋の端部に拡径加工を施すことなく雄ねじ部を転造によって加工する雄ねじ転造過程と、この雄ねじ部が加工された一対の鉄筋の前記雄ねじ部に螺合させるカプラーを準備する過程とを含む異形鉄筋のねじ式鉄筋継手の製造方法。 5. A method of manufacturing a threaded reinforcing bar joint of a deformed reinforcing bar according to claim 1, wherein the deformed reinforcing bar having a protrusion on the outer periphery of the reinforcing bar main body is cut to an arbitrary length. The process, a male thread rolling process in which the male thread part is processed by rolling without subjecting the end of the cut reinforcing bar to a diameter expansion process, and the male thread part of the pair of reinforcing bars in which the male thread part is machined. A method of manufacturing a threaded reinforcing bar joint of a deformed reinforcing bar including a step of preparing a coupler to be deformed.
  6. 　請求項５に記載の異形鉄筋のねじ式鉄筋継手の製造方法において、前記切断過程の後に前記鉄筋の端部における前記雄ねじ部を形成する長さ範囲に、前記突条が略無くなる程度の外径の真円加工を施す真円加工過程を含み、この真円加工過程の後、前記転造を行う異形鉄筋のねじ式鉄筋継手の製造方法。 In the manufacturing method of the threaded reinforcing bar joint of the deformed reinforcing bar according to claim 5, the outer diameter of the extent that the protrusion is substantially eliminated in the length range in which the male screw part is formed at the end of the reinforcing bar after the cutting process. The manufacturing method of the screw-type reinforcing bar joint of the deformed bar which carries out the rolling after this round processing process.
PCT/JP2017/023758 2016-10-13 2017-06-28 Screw-type rebar joint of deformed rebar and manufacturing method thereof WO2018070075A1 (en)

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