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US2870626A - Reinforcing bars having depressed portions for use in concrete constructions - Google Patents

Reinforcing bars having depressed portions for use in concrete constructions Download PDF

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Publication number
US2870626A
US2870626A US564528A US56452856A US2870626A US 2870626 A US2870626 A US 2870626A US 564528 A US564528 A US 564528A US 56452856 A US56452856 A US 56452856A US 2870626 A US2870626 A US 2870626A
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US
United States
Prior art keywords
bar
depressions
reinforcing
reinforcing bars
cross
Prior art date
Legal status (The legal status 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 status listed.)
Expired - Lifetime
Application number
US564528A
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English (en)
Inventor
Gillberg Johannes
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Individual
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Individual
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Filing date
Publication date
Priority to BE499128D priority Critical patent/BE499128A/xx
Priority to GB26419/50A priority patent/GB678776A/en
Priority to FR1027171D priority patent/FR1027171A/fr
Application filed by Individual filed Critical Individual
Priority to US564528A priority patent/US2870626A/en
Application granted granted Critical
Publication of US2870626A publication Critical patent/US2870626A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21B—ROLLING OF METAL
    • B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
    • B21B1/16—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling wire rods, bars, merchant bars, rounds wire or material of like small cross-section
    • B21B1/163—Rolling or cold-forming of concrete reinforcement bars or wire ; Rolls therefor
    • 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

Definitions

  • An object of the invention is to provide depressed portions in the reinforcing bars so as to prevent the bars from creeping in the concrete as well as other desirable properties fully described hereinafter. It has previously been suggested to provide projections of various types on reinforcing bars, the desired profiled shape of the bars being obtained by rolling the bars in a hot state.
  • the present invention is distinguished by the fact that shoulders or depressions of predetermined shape and dimensions are formed in the reinforcing bar by making depressions in the bar in a cold state thereof by compressing the material of the bar at the places of depressions. This results in a number of advantages.
  • the core diameter or smallest cross-sectional area of the bar has to be dimensioned in accordance with the tensile stresses to which the bar is subjected in use.
  • the projections on the bar consequently increase the weight without increasing the tolerable tensile stresses on the bar.
  • the tensile stresses can be calculated for the largest cross-sectional area of the bar, since the reduction of the cross-sectional area due to the depressions is a result of the compression of the material resulting in a corresponding increase of the tensile strength.
  • Thepresent invention consequently saves material.
  • a further object of the invention is to provide simple, efiicient and economical means for transforming a usual round reinforcing metal bar to one in which its tensile strength is improved simultaneously as the anchoring of the metal bar in the concrete is improved.
  • Figure 1 is a view of a reinforcing bar constructed in accordance with this invention
  • Figure 2 is a cross-sectional View taken on line II-II of Figure I,
  • Figure 3 is a cross-sectional view taken on line III-III of Figure 1,
  • Figure 4 is a view of a modified construction of a. reinforcing bar made in accordance with this invention.
  • Figure 5 is a cross-sectional view taken on line VV of Figure 4, V
  • Figure 6 is a cross-sectional view taken on line VIVI of Figure 4,
  • Figure 7 is a view of. still another modified construc- 2,870,626 Patented Jan. 27, 35 9 2 tion of a reinforcing bar made in accordancewith this invention, I
  • Figure 8 is a cross-sectional view taken on line VIlI-VIII of Figure 7,
  • FIG. 9 is a cross-sectional view taken on line IXIX of Figure 7,
  • Figure 10 is a fragmental longitudinal sectional view of an apparatus for forming depressions in a metal bar in accordance with this invention.
  • Figure 11 is a tranverse sectional view of the apparatus shown in Figure 10.
  • Figure 12 is a fragmental side view of the apparatus for forming a reinforcing bar having the construction shown in Figure 7. a
  • reference numeral 1 denotes part of an iron bar having a circular cross-section as shown in Figure 2.
  • the metal bar is illustrated in its original form in which it leaves a hot rolling mill.
  • spaced depressions 2 and 3 are made in the body of the metal bar. These depressions are made in the cold state of the bar so as to obtain a compression of the material resulting in an increase of the tensile strength at the places of depression.
  • shoulders 4 are formed at the places between the depressions and the sections which are maintained in their original shape.
  • sections 5 are left between the depressions which are located at. equal distances from each other longitudinally of the bar.
  • the distance 1 between adjacent depressions 2 or 3 is pre-, determined in accordance with special requirements, but generally said distance should be smaller than six times the diameter of the metal bar and preferably smaller than four times said diameter.
  • the length a of the depression is between 0.3 and twice the diameter of the metal bar, and the length b of the intermediate portion is between 0.2 and twice said diameter.
  • the depressionsl and 3 are located in opposite relation to each other on opposite sides of the reinforcing bar. As will appear from Figure 3, the depressions are convex and extend only over a portion of the width of the bar and smoothly merge into the lateral undepressed portions 6.
  • the depth of the depressions is predetermined'from 3 to 25%, preferably between 6 and 12% of the diameter of the original bar as viewed in the direction of depression.
  • the depressions 7 on opposite sides of the m'etal'brar are arranged in staggered relation.
  • the lengths of the depressions 2 and 3 may vary in relation to the lengths of the intermediate non-depressed surfaces 6 of the metal bar.
  • the outline of this bar has the general shape of zigzag or wave lines.
  • the metal bar in addition to the curved depressions 7 is given a corrugated, sinuous or zigzag-like shape.
  • the depressions 7 are located in staggered relation in the concave portions or valleys of the waveforms on opposite sides of the bar.
  • the distance between ad jacent depressions on the same side of the bar should be between 1.5 and six times, preferably between 2.5 and 4.5 times the diameter of the bar. It will also be evident from Figure 7 that the depth of the waves of thesinuous shaped bar is so dimensioned in relation to the diameter of the bar that no part of the outline of the waves touches they produce a substantial compression of the material,
  • the reinforcing bars need not'bemanufactured-in the rolling mill, but may be given their final shape at the place of use or at the factory.
  • the bars may be supplied in bundles. For instance, a common metal bar having a circular cross-section and a diameter of between A" and 1" may be wound so as to form an annular coil or bundle. Such bundles can be transported in a more Simple and cheaper way than the usual straight reinforcing bars.
  • the bundle may be mounted on a roll from which it is unwound and supplied to a suitable device in which the metal bar is provided with the depressions previously described.
  • the metal bar can be moved either by means of a force acting in the direction of the arrow p or by having the deformation members 8 and9 together with a straightening device for the metal bar and the supply roll for the bar supported by a frame, runner 'or similar member which'is moved towards the right as viewed in Figure 2, while the metal bar is main-.
  • the gear wheels 13 and 14 are positively driven so as to actuate the wheels 8 and 9, the metal bar being moved forward on account of its engagement with the projections 17.
  • the wheels 8 and 9 can be easily exchanged for other wheels so that various types of different shapes with regard to depth and length of the depressions can be manufactured.
  • wheels 18 and 19 which are particularly suitable for effecting a slight corrugation of the metal bar in addition to be curved depressions in the material.
  • the wheels have radial projections 20 of smooth curved form for effecting the curved depressions, and recessed portions 21 between the projections.
  • the metal bar will be slightly bent due to the fact that it rests against two projections 20 while another projection is making a depression at a place between said two projections. The metal bar will thus be alternately bent up and down while being fed between the two wheels to impart a sinuous or wave shape thereto.
  • the depressions as viewed in a lateral direction of the bar, are given a smooth curved shape having no rupture initiating'points.
  • the depressions as well as the slight corrugations of the metal will improve the fasteningof the bar to the concrete.
  • the depth of the depressions vary between 3% and 25%, preferably between 6 and 12% of the diameter of the metal rod.
  • the metal bar while being curved as-it is unwound from aroll, becomes substantially straight except for its corrugation as it leaves the wheels 18 and 19 this being a result of the bending of the bar in either direction when the depressions 7 are produced in the metal bar.
  • a reinforcing iron bar subject to tensile stressesand for use in concrete constructions formed of an elon-. gated iron body having substantially circular cross sectional contour and being bent into a regular wave form, said barhaving cold-compressed depressions in each of the valleys ofthe said waveform, the cross-sectional area of the bar being reduced at said depressions, the depressions on one side of the bar being staggeredrelative to the depressions on the opposite side of the bar, said depressions having a substantially uniform and smoothly curved shape compensating the reduction of the cross sectional area of the bar at the places for the said depressions by increasing the yielding point of the iron bar at the place of the said depressions.
  • a reinforcing iron bar subject to tensile stresses and for use in concrete constructions formed of an elongated iron body having substantially circular cross-sectional contour and being bent into a regular wave form, said bar having cold-compressed depressions in each' of the valleys of the .said waveform, the cross-sectional area of the bar being reduced at said depressions, the depressions on one side of the bar being staggered relative to the depressions on the opposite side of the bar, said depressions having a substantially uniform and smoothly curved shape compensating the reduction of the cross sectional area of the bar at the places for the said depressions by increasing the yielding point of the iron bar at the place of the said depressions and not extending beyond the central longitudinal axis of the bar.
  • a reinforcing iron bar subjectto tensile stresses and for use in concrete constructions formed of an elongated iron body having substantially circular cross-sectional contour and being bent into a regular wave form, the cross-sectional'area of the bar being reduced atsaid depressions, said bar having cold-compressed depressions in each of the valleys of the said wave form, the depressions on one side of the bar being staggered relative to the depressions on the opposite side of the bar, said depressions having a substantially uniform .and smoothly curved shape, the depth of said depressions being between 3% and 25% of the circular diameter of the uncompressed bar and spaced from each other on the same side of the bar at a longitudinal distance of less than 6 times the circular diameter of the bar, compensating the reduction ofv the cross sectional area of. the bar at the places for the said depressions by increasing the yielding point of the iron bar at the place of the said depressions.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Wire Processing (AREA)
US564528A 1949-11-04 1956-02-09 Reinforcing bars having depressed portions for use in concrete constructions Expired - Lifetime US2870626A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
BE499128D BE499128A (xx) 1949-11-04
GB26419/50A GB678776A (en) 1949-11-04 1950-10-30 A method of manufacturing reinforcing bars having depressed portions and a machine for manufacturing such bars
FR1027171D FR1027171A (fr) 1949-11-04 1950-11-03 Procédé de fabrication de fers d'armature munis de saillies et machines en permettant la fabrication
US564528A US2870626A (en) 1949-11-04 1956-02-09 Reinforcing bars having depressed portions for use in concrete constructions

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE678776X 1949-11-04
US19386250A 1950-11-03 1950-11-03
US564528A US2870626A (en) 1949-11-04 1956-02-09 Reinforcing bars having depressed portions for use in concrete constructions

Publications (1)

Publication Number Publication Date
US2870626A true US2870626A (en) 1959-01-27

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US564528A Expired - Lifetime US2870626A (en) 1949-11-04 1956-02-09 Reinforcing bars having depressed portions for use in concrete constructions

Country Status (4)

Country Link
US (1) US2870626A (xx)
BE (1) BE499128A (xx)
FR (1) FR1027171A (xx)
GB (1) GB678776A (xx)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3186206A (en) * 1960-06-21 1965-06-01 Gillberg Johannes Method and apparatus for the manufacture of reinforcing bars
US3654968A (en) * 1969-03-13 1972-04-11 Koshuha Netsuren Kk Steel wire cage wire for chemically prestressed concrete pipe
US20060144007A1 (en) * 2005-01-06 2006-07-06 Michael Azarin Coil bar anchor
US20120328896A1 (en) * 2010-03-02 2012-12-27 Anil Krishna KAR Reinforcing bar and method for manufacturing the same
US20140367549A1 (en) * 2011-12-31 2014-12-18 Michele Caboni Connector with projections of conical or semi - conical section
CN112942687A (zh) * 2021-03-29 2021-06-11 中建八局第二建设有限公司 一种便携式钢筋套筒快速连接的联动齿轮装置
WO2023028379A1 (en) * 2021-08-27 2023-03-02 Marshall Composite Technologies, Llc System, apparatus, and method for bending a reinforcing bar
US11612929B2 (en) * 2017-01-30 2023-03-28 Gripmetal Limited Texture workpiece and method for texturing a workpiece

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1084464B (de) * 1953-09-03 1960-06-30 Moossche Eisenwerke Ag Bewehrungsdraht oder -stab, insbesondere fuer Spannbeton, sowie Verfahren und Vorrichtung zu seiner Herstellung
DE1182277B (de) * 1956-08-06 1964-11-26 Stefan Keller Dipl Ing Verfahren zur Erhoehung der Streckgrenze und der Festigkeit von Walzstahlerzeugnissen, insbesondere von Betonbewehrungsstaehlen und Vorrichtung zur Durchfuehrung des Verfahrens
DE1224762B (de) * 1956-08-27 1966-09-15 Hufnagl Walter Verfahren zum Verfestigen von stab- und drahtfoermigen Staehlen
BE566336A (xx) * 1957-04-20
US4811585A (en) * 1986-04-02 1989-03-14 Nissan Motor Co., Ltd. Device for forming asymmetrical articles by rolling
DE4400974A1 (de) * 1994-01-14 1995-07-20 Inst Stahlbeton Bewehrung Ev Betonstahl

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US691416A (en) * 1901-05-09 1902-01-21 Edwin Thacher Material of construction.
US694193A (en) * 1901-10-26 1902-02-25 Knud S Riser Rib for concrete-arch construction.
US882273A (en) * 1907-04-20 1908-03-17 Edwin E Slick Bar for reinforced concrete construction.
GB190718290A (en) * 1907-08-13 1908-05-14 Theodore Fry And Company Ltd New or Improved Bar for Ferro-concrete Constructions.
US944589A (en) * 1907-09-24 1909-12-28 Daniel Baum Jr Reinforcing-bar for concrete structures.
US1428561A (en) * 1921-05-02 1922-09-12 Karl R Schuster Metal bar of curved cross section
US1601551A (en) * 1924-06-09 1926-09-28 Petter B Abramsen Cross rolling
US2078434A (en) * 1935-04-11 1937-04-27 Sutton Eng Co Method of finishing rounds
US2195741A (en) * 1938-06-30 1940-04-02 Lawrence B Scott Method of repairing cracked metallic castings
US2600677A (en) * 1946-08-03 1952-06-17 Norkin Morris Apparatus for manufacture of slide fasteners

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US691416A (en) * 1901-05-09 1902-01-21 Edwin Thacher Material of construction.
US694193A (en) * 1901-10-26 1902-02-25 Knud S Riser Rib for concrete-arch construction.
US882273A (en) * 1907-04-20 1908-03-17 Edwin E Slick Bar for reinforced concrete construction.
GB190718290A (en) * 1907-08-13 1908-05-14 Theodore Fry And Company Ltd New or Improved Bar for Ferro-concrete Constructions.
US944589A (en) * 1907-09-24 1909-12-28 Daniel Baum Jr Reinforcing-bar for concrete structures.
US1428561A (en) * 1921-05-02 1922-09-12 Karl R Schuster Metal bar of curved cross section
US1601551A (en) * 1924-06-09 1926-09-28 Petter B Abramsen Cross rolling
US2078434A (en) * 1935-04-11 1937-04-27 Sutton Eng Co Method of finishing rounds
US2195741A (en) * 1938-06-30 1940-04-02 Lawrence B Scott Method of repairing cracked metallic castings
US2600677A (en) * 1946-08-03 1952-06-17 Norkin Morris Apparatus for manufacture of slide fasteners

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3186206A (en) * 1960-06-21 1965-06-01 Gillberg Johannes Method and apparatus for the manufacture of reinforcing bars
US3654968A (en) * 1969-03-13 1972-04-11 Koshuha Netsuren Kk Steel wire cage wire for chemically prestressed concrete pipe
US20060144007A1 (en) * 2005-01-06 2006-07-06 Michael Azarin Coil bar anchor
US20120328896A1 (en) * 2010-03-02 2012-12-27 Anil Krishna KAR Reinforcing bar and method for manufacturing the same
US20140367549A1 (en) * 2011-12-31 2014-12-18 Michele Caboni Connector with projections of conical or semi - conical section
US11612929B2 (en) * 2017-01-30 2023-03-28 Gripmetal Limited Texture workpiece and method for texturing a workpiece
CN112942687A (zh) * 2021-03-29 2021-06-11 中建八局第二建设有限公司 一种便携式钢筋套筒快速连接的联动齿轮装置
WO2023028379A1 (en) * 2021-08-27 2023-03-02 Marshall Composite Technologies, Llc System, apparatus, and method for bending a reinforcing bar
US12186968B2 (en) 2021-08-27 2025-01-07 Marshall Composite Technologies, Llc System, apparatus, and method for bending a reinforcing bar

Also Published As

Publication number Publication date
BE499128A (xx)
FR1027171A (fr) 1953-05-08
GB678776A (en) 1952-09-10

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