WO2001023118A1 - Procede de traitement des extremites de raccordement de barres en acier deformees servant a renforcer le beton, et barre en acier deformee traitee selon ce procede - Google Patents

Procede de traitement des extremites de raccordement de barres en acier deformees servant a renforcer le beton, et barre en acier deformee traitee selon ce procede Download PDF

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Publication number
WO2001023118A1
WO2001023118A1 PCT/KR1999/000581 KR9900581W WO0123118A1 WO 2001023118 A1 WO2001023118 A1 WO 2001023118A1 KR 9900581 W KR9900581 W KR 9900581W WO 0123118 A1 WO0123118 A1 WO 0123118A1
Authority
WO
WIPO (PCT)
Prior art keywords
steel bar
deformed steel
concrete reinforcement
deformed
cylindrical body
Prior art date
Application number
PCT/KR1999/000581
Other languages
English (en)
Japanese (ja)
Inventor
Gyeng-Ok Chung
Chung-Ki Yoo
Original Assignee
Chung Gyeng Ok
Yoo Chung Ki
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chung Gyeng Ok, Yoo Chung Ki filed Critical Chung Gyeng Ok
Priority to JP2001526313A priority Critical patent/JP3780209B2/ja
Priority to AU60080/99A priority patent/AU6008099A/en
Priority to PCT/KR1999/000581 priority patent/WO2001023118A1/fr
Publication of WO2001023118A1 publication Critical patent/WO2001023118A1/fr

Links

Classifications

    • 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
    • E04C5/162—Connectors or means for connecting parts for reinforcements
    • E04C5/163—Connectors or means for connecting parts for reinforcements the reinforcements running in one single direction
    • E04C5/165—Coaxial connection by means of sleeves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21F—WORKING OR PROCESSING OF METAL WIRE
    • B21F5/00—Upsetting wire or pressing operations affecting the wire cross-section
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
    • B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
    • B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
    • B21J5/08—Upsetting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/56—Making machine elements screw-threaded elements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
    • E04C5/03—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance with indentations, projections, ribs, or the like, for augmenting the adherence to the concrete
    • 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

Definitions

  • the present invention relates to a method of threading a connection end of a deformed steel bar for concrete reinforcement which forms a framework of a construction at a construction or civil engineering site, and a deformed steel bar processed by this method. It is about. BACKGROUND ART
  • concrete structures are erected in the process of casting and curing concrete after setting up a basic framework using deformed steel bars for concrete reinforcement.
  • atypical ⁇ means that protrusions are formed on the surface, but usually, the protrusions in the axial direction are called “reaves”, and the protrusions other than the axis, that is, the protrusions in the circumferential direction are “nodes”. Called.
  • deformed steel bars for concrete reinforcement are cut and supplied at a specified length by the manufacturing industry, it is necessary to cut or interconnect the deformed steel bars for concrete reinforcement depending on the size of the construction. Will be used at a reasonable length.
  • Reinforcing bars connected by the latching method are driven by concrete mortar, and after curing is completed, steel bars connected for the first time by the adhesive force with concrete Due to the strength of the muscle structure, if there is a problem with concrete mortar or curing, the fragile structural properties of the structure can appear.
  • connection end which is a kind of mechanical connection method
  • a hot upsetting method of a connection end which is a kind of mechanical connection method
  • a force was applied in the axial direction of the deformed steel bar
  • the connection end was set up, and a rolling screw was machined at the upset portion.
  • this method also has a problem that the material is lost due to the reduced length of the deformed bar.
  • the elongation is reduced due to the structural change in the material of the connection end between the heat-affected part and the unaffected part, resulting in impact.
  • FIGS. 1A and 1B A different cold method has been developed to solve the above problems.
  • a method has been proposed in which the connection end of the deformed steel bar is upset at room temperature with a large pressure along the axial direction.
  • the deformed steel bars processed by the above upset method have the problem that tensile strength and hardness are very high due to work hardening, and the impact absorption energy value drops sharply. It may also indicate the phenomenon of breaking at the processed part.
  • the deformed steel bars with connecting ends as shown in Fig. 2D are connected by a force blur and a tensile load is applied in the axial direction and the vertical direction of the shaft.
  • a tensile load is applied in the axial direction and the vertical direction of the shaft.
  • pearlite and ferrite microstructures are arranged long in the working direction, but work hardening occurs when this part is subjected to primary cold plastic working. Occurs during secondary rolling screw machining. Curing atypical steel bar inside the organization there is a problem that is thus destroyed the work hardening occurs.
  • Figs. 6 and 7 show the upset and the original material, respectively.
  • Fig. 7 ⁇ ⁇ shows that the ferrite and pearlite microstructures are continuously elongated in the axial direction
  • Fig. 6 ⁇ shows that the metal microstructures are discontinued in the axial direction. I understand.
  • Fig. 6 and Fig. 7 show the structure along the direction perpendicular to the axis of the upset and the base material, respectively.
  • the ferrite and pearlite structures are uniformly distributed in the base material in Fig. 7
  • the metal structure becomes considerably coarse. This shows that the texture of the upset portion is formed unevenly.
  • the present invention has been devised to solve the above various problems. Rolling thread processing into the lead and joint of the deformed steel bar without cutting, or swaging the connecting end of the deformed steel bar larger than the diameter of the fuselage surface.
  • connection end of the deformed steel bar for concrete reinforcement which has increased tensile strength while maintaining the inherent fiber structure of the deformed steel bar by forming the part, and the deformed steel bar connection end obtained by this method Providing a department has its purpose.
  • the present invention improves the mechanical strength by being manufactured by cold swaging and rolled screw processing without applying heat, thereby increasing the metal structure and reducing the internal structure including the cylindrical body.
  • a method for adding a connection end of a deformed steel bar for concrete reinforcement, which is capable of withstanding high loads and impacts by being maintained in an inherent structure, and a connection end of a deformed steel bar obtained by this method There are other objectives in providing the department.
  • FIG. 1A is a schematic view of a connection end of a deformed steel bar processed by an upset method according to a conventional technique.
  • FIG. 1B is a diagram showing a shape obtained by rolling and forming a connecting end portion of a deformed steel bar processed by the upset method of FIG. 1A.
  • FIG. 2A to FIG. 2C are processing sequence diagrams of a connection end portion of a deformed steel bar according to the related art.
  • FIG. 2D is a diagram of a paddle state of a notch portion generated by a cold plastic working degree.
  • 3A to 3D are flowcharts showing a method of processing a connection end of a deformed steel bar for concrete reinforcement according to the present invention.
  • FIG. 3E is a thread shape diagram of the connection end portion of the deformed steel bar illustrated in FIG. 3D with the lateral joints facing upward.
  • FIG. 4A and FIG. 4B are swaging state diagrams of the deformed bar according to the present invention.
  • FIG. 5A and FIG. 5B are sequence diagrams for processing a rolled screw portion without performing a swaging step as another embodiment of the present invention.
  • FIG. 6A is a metallographic diagram along the axial direction of the connection end portion in FIG.
  • FIG. 6B is a metal thread diagram along a direction perpendicular to the axis of the connection end of FIG.
  • FIG. 7A is a metallographic diagram of an original material used in the present invention and the prior art along the axial direction.
  • FIG. 7B is a metallographic diagram along the direction perpendicular to the axis of the original material used in the present invention and the prior art.
  • FIG. 8A is a metallographic diagram of the connection end portion of the deformed steel bar according to the present invention in the axial direction.
  • FIG. 8B is a metal assembly diagram along a direction perpendicular to the axis of the connection end of the modified steel bar according to the present invention.
  • FIGS. 9A and 9B are desirable illustrations of threads formed at the connection end of the modified steel bar according to the present invention.
  • FIG. 10 is an enlarged view of the screw portion of FIG. 3E.
  • FIG. 11A to FIG. 11C are views showing a state in which a deformed steel bar for concrete reinforcement is connected with a coupler.
  • BEST MODE FOR CARRYING OUT THE INVENTION the present invention relates to a method for connecting at least one of a transverse rib formed on a cylindrical body surface and a deformed steel bar having a number of circumferential nodes.
  • a method for processing a connection end of a deformed steel bar for concrete reinforcement in which a screw is processed only in a leave and a node formed in a predetermined section on an end side.
  • the present invention also relates to a deformed steel bar for interconnecting a deformed steel bar in which a lateral leave and a large number of circumferential nodes are formed on the surface of a cylindrical body, at least one end of the deformed steel bar.
  • the predetermined section of the portion is formed by swaging to be larger than the diameter of the cylindrical body surface by a predetermined size, the swaging is performed as described above.
  • the present invention provides a deformed steel bar for reinforcing concrete in which a thread is formed at a lateral leave and a circumferential node.
  • a deformed steel bar for interconnecting a deformed steel bar in which a lateral leave and a large number of circumferential nodes are formed on a cylindrical body surface at least one of the above-described deformed steel bars has a predetermined section at one end. Is formed to be larger than the diameter of the cylindrical body surface by a predetermined size by swaging, but the above-mentioned swaged transverse ribs and threaded joints at the circumferential section are used for concrete reinforcement.
  • Fig. 3A shows the deformed steel bar for concrete reinforcement before processing.
  • the deformed steel bar for concrete reinforcement (100) has a prototype body (10) and nodes formed at equal intervals on the circumferential surface of the body. (20), and a lateral leave formed in the axial direction of the cylindrical body ⁇ ).
  • Figure 3 ⁇ shows the swaging process, in which a fluid or mechanical device is inserted into a swaging mold made of two or more pieces or rolls (Figure 4 ⁇ is a front view, and Figure 4 ⁇ is a side view). Perform the swaging process at room temperature with strong force. Along with this, the diameter of the leave (30) and the joint (20) of the connection end (40) shown in Fig. 3 ⁇ is squeezed by a predetermined size larger than the body diameter (10) of the deformed steel bar (100).
  • the height ( ⁇ 2) of the circumferential knot (20) and the horizontal leave (30) after being removed is the circumferential knot ( ⁇ ) or the horizontal leave height (HI) of the original material. It is desirable to form 5 to 95% or more of this. This is because when the swaging diameter is less than 5% of the knot or leave height of the original material, that is, when it is close to the diameter of the cylindrical body, the notch probability increases, and when it is more than 95%, When approaching the knots or leave heights of the original material, the rolled thread machining length must be longer than the thread length corresponding to the nominal diameter of the deformed bar.
  • the swaging diameter is equal to that of the knot or lead in the state of the original material. It is a well-known fact that the height is not necessarily limited to 5 to 95% of the bush height, but may appear slightly different depending on the manufacturing specifications of each reinforcing steel company or the swaging condition.
  • the boundary between the circumferential node (20) and the cylindrical body (10) is processed so as to maintain the shape of the original material, thereby suppressing the occurrence of cracks. Can be made more reliable.
  • the axis (19) of the cylindrical body (10) and the axis (59) of the swaging part (50) are aligned.
  • the deformed protruding portions of the nodes (20) and the leaves (30) or the deformed bar steel can be straightened through this process.
  • the cross-section (53) of the connecting end protruded in the swaging process is cross-sectioned and chamfered, and the cross-section (53) is flattened to obtain a cross-section (53).
  • the outer peripheral edge (55) is chamfered. In this way, it is intended to suppress screw damage at the corners when handling deformed steel bars and to improve the tightenability.
  • FIG. 3D and FIG. 3E are state diagrams in which rolled screws have been machined at the connection ends of the deformed steel bars that have been swaged.
  • Fig. 3D shows the shape of the thread when the transverse leave is located in the front direction. Although the outer peripheral surface of the swaging part (50) is rolled, the transverse leave (30) is used. The complete thread (60) is formed at the circumferential node (20) and the incomplete thread (61) is formed at the cylindrical body.
  • FIG. 3E is a view showing the shape of the thread when the above-mentioned lateral leave is positioned on the upper side, and shows a state where a complete thread is machined into the joint portion and the cylindrical body surface.
  • the outer diameter (64, 62) of the rolled screw portion (60, 61) is formed larger than the diameter (11) of the body ⁇ ). In this way, the thread (60, 61) of the deformed steel bar for concrete reinforcement processed according to the present invention is not cut, and the circumferential joint (20) and the lateral leave (30) are cooled.
  • the mechanical strength is improved by inter-swinging and rolling thread processing, the metal structure becomes finer, and the internal structure including the cylindrical body (10) maintains its inherent structure, so high loads and impacts Also endure.
  • Table 1 shows a comparative example of the tensile strength of the deformed steel bars processed according to the present invention and the corresponding deformed steel bars of the ASTM (US Industrial Standard) standard and the KS (Korean Industrial Standard) standard. [Table 1] Tensile strength (kgfZmm 2 )
  • connection end of the deformed steel bar is swaged
  • the present invention is not limited to this.
  • a rolled screw portion can be formed in a node (20 ′;) and a leave (30 ′) of the original material itself of the deformed bar.
  • a coupler with a length greater than the sum of the diameters of both deformed steel bars must be used.However, when rolling threads are processed in the original material state, work hardening does not occur. Not only does this not only make it easier, but also there is no notch that adversely affects tensile strength.
  • FIGS. 8A and 8B show micrographs of the structure of the connection end portion of the deformed steel bar according to the present invention.
  • Fig. 8A shows the metal structure along the axial direction of the deformed bar, and it can be seen that the continuity of the pearlite and ferrite structures shown in Fig. 7A appears more clearly and the structure becomes denser.
  • Fig. 8B shows the microstructure of the deformed bar in the direction perpendicular to the axis, which appears denser than the pearlite and ferrite microstructures in Fig. 7B.
  • the diameter of the thread valley (65) at the boundary adjacent to the above-mentioned leave (30) and the joint (20) at the roll-formed thread (60) is changed to the other side. It is possible to suppress the stress concentration phenomenon by processing sequentially larger than the valley diameter (63).
  • FIG. 3A shows a deformed steel bar (100) for concrete reinforcement in which the leaves (30) and the nodes (20) are formed, but the present invention is not limited to this. Or it can also be applied to deformed steel bars for concrete reinforcement with leaves formed by X-rays.
  • FIGS. 11A to 11C show a method of connecting the deformed steel bars for concrete reinforcement of the present invention configured as described above.
  • the shape of the rolled thread (60, 61) corresponds to the shape of the rolled thread (60, 61) formed at the connection end of each deformed steel bar (100).
  • the use of a coupler (200) having a nut part allows the threaded threaded parts formed at the odd-shaped connection ends to be interconnected.
  • connection is formed by cold swaging and rolling
  • the threads are formed completely in the leaves and joints, and the incomplete threads are formed in the cylindrical body to maximize work hardening.

Abstract

L'invention concerne un procédé de traitement des extrémités de raccordement de barres en acier déformées servant à renforcer le béton. Ce procédé consiste à usiner un matériau brut destiné à une barre en acier déformée, à former des filets laminés sur des nervures et des noeuds ou à matricer l'extrémité de raccordement de cette barre en acier déformée de façon à obtenir un diamètre plus important que celui d'un cylindre, puis à former lesdits filets laminés, ce qui permet d'améliorer la résistance mécanique de cette barre et d'en faciliter le traitement tout en conservant la structure fibreuse intrinsèque de ces barres en acier déformées, d'où une forte réduction du coût du traitement. L'invention concerne également une barre en acier obtenue selon ce procédé. Pendant l'exécution d'un matriçage à froid permettant la déformation plastique, à une température ordinaire, d'une zone prédéterminée située sur le côté associé à l'extrémité de raccordement d'au moins une barre en acier déformée pourvue de nervures transversales et d'une pluralité de noeuds circonférentiels sur sa surface cylindrique, une première étape de ce procédé consiste à traiter les nervures transversales et les noeuds circonférentiels de manière à obtenir, dans une mesure prédéterminée, un diamètre plus important que celui du cylindre, une second étape consistant à former une partie filetée par laminage d'une partie prédéterminée située sur le côté associé à l'extrémité de raccordement de la barre en acier déformée matricée.
PCT/KR1999/000581 1999-09-27 1999-09-27 Procede de traitement des extremites de raccordement de barres en acier deformees servant a renforcer le beton, et barre en acier deformee traitee selon ce procede WO2001023118A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2001526313A JP3780209B2 (ja) 1999-09-27 1999-09-27 コンクリート補強用の異型棒鋼の連結端部の加工方法及びこの方法により加工された異型棒鋼
AU60080/99A AU6008099A (en) 1999-09-27 1999-09-27 Method of processing connecting ends of deformed steel bar used for reinforcing concrete, and deformed steel bar processed by this method
PCT/KR1999/000581 WO2001023118A1 (fr) 1999-09-27 1999-09-27 Procede de traitement des extremites de raccordement de barres en acier deformees servant a renforcer le beton, et barre en acier deformee traitee selon ce procede

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR1999/000581 WO2001023118A1 (fr) 1999-09-27 1999-09-27 Procede de traitement des extremites de raccordement de barres en acier deformees servant a renforcer le beton, et barre en acier deformee traitee selon ce procede

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Publication Number Publication Date
WO2001023118A1 true WO2001023118A1 (fr) 2001-04-05

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AU (1) AU6008099A (fr)
WO (1) WO2001023118A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3527739A4 (fr) * 2016-10-13 2020-05-20 Akira Fukuda Structure de joint de barre d'armature du type à vis d'une barre d'armature déformée et son procédé de fabrication

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4991073A (fr) * 1972-12-30 1974-08-30
GB2162915A (en) * 1984-08-09 1986-02-12 Allied Steel Wire Ltd Reinforcing bar coupling
JPH02204555A (ja) * 1989-02-02 1990-08-14 Kurosawa Kensetsu Kk ねじ付き防腐被覆ｐｃ鋼棒及びその製造方法
US5158527A (en) * 1988-02-03 1992-10-27 Techniport S.A. Method and apparatus for mechanically joining concrete-reinforcing rods
US5660594A (en) * 1992-06-01 1997-08-26 Tartuntamarkkinointi Oy Method of making a threaded connection for reinforcing bars
US5776001A (en) * 1994-02-16 1998-07-07 Ccl Systems Limited Thread formation

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4991073A (fr) * 1972-12-30 1974-08-30
GB2162915A (en) * 1984-08-09 1986-02-12 Allied Steel Wire Ltd Reinforcing bar coupling
US5158527A (en) * 1988-02-03 1992-10-27 Techniport S.A. Method and apparatus for mechanically joining concrete-reinforcing rods
JPH02204555A (ja) * 1989-02-02 1990-08-14 Kurosawa Kensetsu Kk ねじ付き防腐被覆ｐｃ鋼棒及びその製造方法
US5660594A (en) * 1992-06-01 1997-08-26 Tartuntamarkkinointi Oy Method of making a threaded connection for reinforcing bars
US5776001A (en) * 1994-02-16 1998-07-07 Ccl Systems Limited Thread formation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3527739A4 (fr) * 2016-10-13 2020-05-20 Akira Fukuda Structure de joint de barre d'armature du type à vis d'une barre d'armature déformée et son procédé de fabrication
US11274446B2 (en) 2016-10-13 2022-03-15 Akira Fukuda Screw-type rebar joint structure of deformed rebar and manufacturing method thereof
AU2017341568B2 (en) * 2016-10-13 2022-10-27 Akira Fukuda Screw-type rebar joint structure of deformed rebar and manufacturing method thereof

Also Published As

Publication number Publication date
AU6008099A (en) 2001-04-30
JP3780209B2 (ja) 2006-05-31

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