US3335539A - Spirally ribbed reinforcing bar for concrete - Google Patents

Spirally ribbed reinforcing bar for concrete Download PDF

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Publication number
US3335539A
US3335539A US307489A US30748963A US3335539A US 3335539 A US3335539 A US 3335539A US 307489 A US307489 A US 307489A US 30748963 A US30748963 A US 30748963A US 3335539 A US3335539 A US 3335539A
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US
United States
Prior art keywords
core
longitudinal
lugs
ribs
bar
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
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US307489A
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English (en)
Inventor
Soretz Stefan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TOR ISTEG STEEL CORP
TOR-ISTEG STEEL Corp
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TOR ISTEG STEEL CORP
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Application filed by TOR ISTEG STEEL CORP filed Critical TOR ISTEG STEEL CORP
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Publication of US3335539A publication Critical patent/US3335539A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D11/00—Bending not restricted to forms of material mentioned in only one of groups B21D5/00, B21D7/00, B21D9/00; Bending not provided for in groups B21D5/00 - B21D9/00; Twisting
    • B21D11/14—Twisting
    • B21D11/15—Reinforcing rods for concrete
    • 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

  • each bar comprising a core, at least one continuous longitudinal rib which extends helically circumferentially around the core and oblique lugs are longitudinally spaced on the core periphery, which are separate from and interspersed between the longitudinal rib, and is a continuationin-part of the ap lication filed by Stefan Soretz on June 7, 1960, Ser. No. 34,412 and now abandoned.
  • transverse and oblique ribs which terminate in the flanks of longitudinal ribs and are inclined with respect to the bar axis, involve considerable disadvantages.
  • Conventional transverse ribs constitute a thickened portion extending around the core of the bar over short lengths and this construction results in local resistance to free deformation under tension, which results in stress peak at the sloping surfaces where the flanks of the transverse ribs merge into the core surface.
  • a notch effect of the transverse ribs results in further stress peaks at these regions, which is further increased if a bending roller impinges against the transverse ribs, which is practically unavoidable.
  • the reinforcing bar for concrete is characterized in having a cylindrical core, two continuous longitudinal ribs extending helically around the periphery of the core and a longitudinal series of relatively short spaced-apart lugs arranged on the core between the two continuous longitudinal ribs in overlapping spiral relation to each other regarding the component of the ribs transverse to the longitudinal axis of the bar and obliquely disposed on the core periphery in angular relation relative to the spiral rib with the rear ends of succeeding lugs overlapping the forward ends of preceding lugs, the length of the component of the oblique lugs transverse to the longitudinal axis of the bar, comprising at least half of the core diameter and said oblique lugs having an angle of inclination not greater than 50 relative to the longitudinal axis of said core and extending toward said longitudinal rib and terminating in spaced relation thereto, said angle being greater than the angularity of said helical rib relative to the longitudinal axis of said core.
  • the reinforcing bar according to the claimed invention remains completely bendable, that is, the bar may be bent first in the one direction and then in the opposite direction ice without showing cracks or a rupture in the bar. The danger of brittle fracture or formation of cracks at the end of the oblique lugs is avoided.
  • the short rib should lie as much as possible transverse to the longitudinal axis of the bar. But the transverse position of the short rib causes an increased or total danger of brittle fracture. If the bar is, however, formed according to the claimed invention by a cooperation of the above mentioned combination features, there is provided a reinforcing bar strengthened in the cold state by twisting which has all required properties to be obtained in a practical and novel manner. A sufficient bonding effect is obtained without the danger of brittle fracture.
  • FIG. 1 is an elevational view of portion of a reinforcin bar for concrete according to the invention
  • FIG. 2 is a section on the line II-II of FIG. 1.
  • a reinforcing bar for concrete is illustrated in the drawings and comprises a core 1 and two continuous, parallel longitudinal ribs 2 and 3 which extend helically around the core by twisting. Provided between these longitudinal ribs are oblique lugs 4.
  • the oblique lugs 4 do not terminate in the flanks of the longitudinal ribs 2 or 3, but terminate at a distance 5 from the longitudinal ribs, which distance can amount to about 0.1 d, where d is the diameter of the core, see FIG. 2.
  • the inclination 0c of the oblique lugs 4 relative to the longitudinal bar axis 6, designated by a dot-dash line, is kept within the range of 30' to 5 0. This ensures that the oblique position of the lugs is such that the length 10 of the component of the oblique lugs 4 transverse to the longitudinal axis of the bar amounts to at least half of the core diameter. It is necessary to ensure that the deviation of the oblique lugs 4 from the parallel to the longitudinal ribs 2 amounts to at least 5", in order to give an adequate guarantee against rotation of the bars in a concrete mass when the bar is subjected to stress.
  • the oblique lugs 4 must be disposed at at least 22 in order to provide adequate security against turning movement.
  • the angle or will advantageously be chosen between 30 and 50.
  • the spacing 7 of the oblique lugs from one another is, on the average, about the size of the diameter when measured along the length of the bar.
  • the spacing apart can increase to four dimes d.
  • the spacing apart of the oblique lugs can be reduced to about 0.5 d.
  • the oblique lugs should be so arranged that the terminal ends overlap one another (FIG. 1). This measure has the advantage that all the oblique lugs participate in the ability of the bar to withstand tensile stresses, i.e. no dead weight occurs such as is unavoidable with the conventional transverse and oblique ribs.
  • a reinforcing bar for concrete said bar having a right cylindrical core which is circular in transverse cross section, two continuous longitudinal ribs extending heli cally around the periphery of the core, a longitudinal ifiliBS of relatively short spiral lugs arranged on the core retween the two continuous longitudinal ribs, each of ;aid lugs having forward and rear ends, the rear end of :ach lug being in longitudinal overlapping relationship rvith the forward end of an adjacent preceding lug, each )i said lugs being obliquely disposed on the core with ;he forward and rear ends terminating short of the ribs, :he longitudinal axis of each lug defining an acute angle with the longitudinal axis of the core ranging between 30 to 50 degrees, each of said lugs having a transverse and longitudinal component of length measured respectively parallel and normal to the longitudinal axis of the core, the transverse component of length of each lug being at least half the core diameter, each of said ribs defining an angle with
  • a reinforcing bar for concrete said bar having a right cylindrical core which is circular in transverse crosssection, two continuous longitudinal ribs extending helically around the periphery of the core, a longitudinal series of relatively short spiral lugs arranged on the core between the two continuous longitudinal ribs, each of said lugs having forward and rear ends, the rear end of each lug being in longitudinal overlapping relationship with the forward end of an adjacent preceding lug, each of said lugs being obliquely disposed on the core with the forward and rear ends terminating short of the ribs,
  • each lug defining an acute angle 3 with the longitudinal axis of the core ranging between 30 to 50 degrees
  • each of said lugs having a transverse and longitudinal component of length measured respectively parallel and normal to the longitudinal axis of the core, the transverse component of length of each lug being at least half the core diameter
  • each of said ribs defining an angle with the longitudinal axis of the core, said last mentioned angle being less than the angle defined by each longitudinal lug axis and spacing of said oblique lugs from one another, measured substantially at their midpoints, ranging between one to four times the diameter of said core.
  • FRANK L. ABBOTT Primary Examiner.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Reinforcement Elements For Buildings (AREA)
  • Acyclic And Carbocyclic Compounds In Medicinal Compositions (AREA)
US307489A 1959-06-10 1963-09-09 Spirally ribbed reinforcing bar for concrete Expired - Lifetime US3335539A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DET0016798 1959-06-10

Publications (1)

Publication Number Publication Date
US3335539A true US3335539A (en) 1967-08-15

Family

ID=7548355

Family Applications (1)

Application Number Title Priority Date Filing Date
US307489A Expired - Lifetime US3335539A (en) 1959-06-10 1963-09-09 Spirally ribbed reinforcing bar for concrete

Country Status (4)

Country Link
US (1) US3335539A (en, 2012)
BE (1) BE591237A (en, 2012)
GB (1) GB904773A (en, 2012)
LU (1) LU38644A1 (en, 2012)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3641799A (en) * 1970-07-16 1972-02-15 Bethlehem Steel Corp Deformed wire for concrete reinforcement
US4137686A (en) * 1977-02-05 1979-02-06 Dyckerhoff & Widmann Aktiengesellschaft Steel rods with hot rolled ribs formed in a partial spiral
US4254597A (en) * 1979-08-15 1981-03-10 Allied Surveyor Supplies Manufacturing Co. Sectionalized driven rod
US10260234B1 (en) * 2017-12-22 2019-04-16 Yu-Liang Kuo Deformed reinforcing bar, truss structure, and floor module structure

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE511786A (en, 2012) * 1951-06-01
BE559836A (en, 2012) * 1956-09-05
US891234A (en) * 1908-06-23 Harry A Crane Reinforcing-bar for cementitious bodies.
US1076192A (en) * 1908-05-22 1913-10-21 William C Coryell Reinforcing-bar for concrete and similar structures.
US1339226A (en) * 1919-11-18 1920-05-04 Karl R Schuster Structural bar
US2374827A (en) * 1941-09-20 1945-05-01 Carl A Menzel Concrete reinforcing bar
US2377980A (en) * 1944-05-24 1945-06-12 Inland Steel Co Reinforcing bar
US2552364A (en) * 1946-06-10 1951-05-08 Sheffield Steel Corp Reinforcing bar or rod
FR1166624A (fr) * 1956-05-11 1958-11-13 Klockner Huettenwerk Haspe Ag Fer d'armature torsadé pour le béton armé

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US891234A (en) * 1908-06-23 Harry A Crane Reinforcing-bar for cementitious bodies.
US1076192A (en) * 1908-05-22 1913-10-21 William C Coryell Reinforcing-bar for concrete and similar structures.
US1339226A (en) * 1919-11-18 1920-05-04 Karl R Schuster Structural bar
US2374827A (en) * 1941-09-20 1945-05-01 Carl A Menzel Concrete reinforcing bar
US2377980A (en) * 1944-05-24 1945-06-12 Inland Steel Co Reinforcing bar
US2552364A (en) * 1946-06-10 1951-05-08 Sheffield Steel Corp Reinforcing bar or rod
BE511786A (en, 2012) * 1951-06-01
FR1166624A (fr) * 1956-05-11 1958-11-13 Klockner Huettenwerk Haspe Ag Fer d'armature torsadé pour le béton armé
BE559836A (en, 2012) * 1956-09-05
FR1181961A (fr) * 1956-09-05 1959-06-19 Tor Isteg Steel Corp Barre d'armature pour ouvrages en béton

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3641799A (en) * 1970-07-16 1972-02-15 Bethlehem Steel Corp Deformed wire for concrete reinforcement
US4137686A (en) * 1977-02-05 1979-02-06 Dyckerhoff & Widmann Aktiengesellschaft Steel rods with hot rolled ribs formed in a partial spiral
US4254597A (en) * 1979-08-15 1981-03-10 Allied Surveyor Supplies Manufacturing Co. Sectionalized driven rod
US10260234B1 (en) * 2017-12-22 2019-04-16 Yu-Liang Kuo Deformed reinforcing bar, truss structure, and floor module structure

Also Published As

Publication number Publication date
DE1409168A1 (de) 1969-01-30
GB904773A (en) 1962-08-29
BE591237A (fr) 1960-11-25
LU38644A1 (en, 2012)

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