US2260779A - Method of making ferroconcrete reinforcing elements - Google Patents

Method of making ferroconcrete reinforcing elements Download PDF

Info

Publication number
US2260779A
US2260779A US23732538A US2260779A US 2260779 A US2260779 A US 2260779A US 23732538 A US23732538 A US 23732538A US 2260779 A US2260779 A US 2260779A
Authority
US
Grant status
Grant
Patent type
Prior art keywords
rod
twisting
rods
method
cold rolling
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
Inventor
Hoffmann Ernst
Original Assignee
Hoffmann Ernst
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
Grant date

Links

Images

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21DWORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21D11/00Bending 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
    • B21D11/14Twisting
    • B21D11/15Reinforcing rods for concrete
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21BROLLING OF METAL
    • B21B1/00Metal-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
    • B21B1/16Metal-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
    • B21B1/163Rolling or cold-forming of concrete reinforcement bars or wire ; Rolls therefor
    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
    • C21D7/00Modifying the physical properties of iron or steel by deformation
    • C21D7/02Modifying the physical properties of iron or steel by deformation by cold working
    • C21D7/10Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars
    • C21D7/105Modifying the physical properties of iron or steel by deformation by cold working of the whole cross-section, e.g. of concrete reinforcing bars of concrete reinforcing bars
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04CSTRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/02Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
    • E04C5/03Reinforcing 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
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00Metal working
    • Y10T29/49Method of mechanical manufacture
    • Y10T29/49616Structural member making
    • Y10T29/49623Static structure, e.g., a building component
    • Y10T29/49632Metal reinforcement member for nonmetallic, e.g., concrete, structural element

Description

Oct. 28, 1941. HOFFMAN 'Z',Z60,779

METHOD OF MAKING FERROCONCRETE IREINFORCING ELEMENTS Filed Oct. 27, 1938 I'm enter fwd W Patented Oct. 28, 1 941 warrior) or MAKING manoconcnara' REINFORCING ELEMENTS Ernst Hcflmann, Vienna, Germany ripplication October 27, 1938, Serial No. 237,325 In Austria October 28, 1937 6 Claims.

This invention relates to ferro-concrete reinforcement elements, and to the manufacturing thereof.

It is known that the strength of reinforcing elements for concrete structures can be increased, thus permitting of higher loads being applied thereto, by subjecting the reinforcing rods to cold twisting with simultaneous stretching. This stretch-twisting process has its limitations since more than a certain degree of twisting results in destruction of the structure of the material. The degree of twisting must therefore be limited and consequently an increase of the elastic limit of the rods beyond a certain value is impossible.

In accordance with the present invention the strength of reinforcing elements for concrete structures is considerably increased by rolling the rods between profiled rolls which subject the material of the rod to a kneading action whereby its bonding capacity is increased simultaneously. The rods of flattened cross section obtained by this process may then be subjected to the known twisting or stretch-twisting operation, or two or more of them may be twisted together with or without simultaneous stretching.

For the better understanding of the invention, reference is now made to the accompanying drawing, in which:

I the opposite direction;

Figures 4 and 5 are views similar to Figures 3 (c) and 3 (d), showing the result obtained with a modified rolling operation.

In carrying out the invention according to one embodiment thereof, the round section'iron or steel rod i shown in Figures 1 and 3 (a) is first subjected to a cold rolling operation between profiled rolls, whereby the rod is given the form shown in Figures 2 and 3 (b) the rod being. flattened in cross section and indentations 2 formed in the flat faces. These indentations may be-of an desired shape and disposition, but preferably they take the form of parallel notches, inclined to the axis of the rod and so disposed that no cross section of the rod is weakened by more than one of the notches on each side of the rod, all as shown in the drawing. The notches formed in the two opposite flat sides of the rod are oppositely inclined, so that they cross one another when the rod is viewed in elevation. In this cold rolling process the material of the rod is very considerably improved by the kneading action, particularly in the zones marked A in the Figure 2. The elastic limit of the reinforcing element produced is considerably higher than that of the initial round rod but does not possess the defects which would result from excessive twisting.

The strength of the cold rolled rod may be increased further by a twisting operation, with or without simultaneous stretching, without causing the formation of harmful cracks or the like. If the rod is twisted in the direction of the arrow I of Figure 3 (b) it assumes the shape shown in Figure 3 (d), while if it is twisted in the direction of the arrow II of Figure 3 (b) it assumes the shape shown in Figure 3 (c) In the former case the notches extend after twisting substantially perpendicularly to the helical line of the twisted outer fibres, while in the rod shown in Figure 3 (d) they extend substantially parallel to the helical line of the outer fibres. These two arrangements have various advantages, which are of importance in reinforced concrete construction. The reinforcing rod of Figure 3 (c) is distinguished by particularly good adhesive capacity,

.while that of Figure 3 (d) can resist stretching In carrying out the twisting operation upon the rods thus far described, care must be taken to see that the twisting takes place in the required direction and owingto the awkward nature of the work pieces some difliculty and loss of time may be experienced in presenting them to the twisting machine in the required position. For this reason it has been found preferable to modify the cold rolling process so that the inclined notches on the two opposite faces of the rod lie parallel to one another instead of crossing. Somewhat surprisingly it is found that such a rolling process does not cause bending of the rod to an extent greater than can subsequently be rectified by a trueing operation or by the twisting operation itself. when the rods are cold rolled in this manner, the same result is obtained whichever direction of twisting is adopted, as clearly appears from Figures 4 and 5, so that the rods may be fed to the twisting machine in the usual way. The twisted rods thus obtained comblue the advantages of the rods shown in Figures ,3 (c) and a (a).

In all cases, the twisting operation improves more particularly those zones which are not di rectly influenced by the cold rolling operation. This is due to the fact that as a result of the rolling operation the zones (A in Figure 2) partieularly influenced by the cold rolling are brought nearer to the axis of the rod. while the zones least influenced (B in Figure 2) are forced away from the axis and are consequently most affected by the twisting operation. Thus a greater increase of the elastic limit is obtained by a relatively small degree of twisting and cracks due to twisting are avoided. The twisting operation also results in an equalization of the strength over the whole length of the reinforc- 2. A method for the production of a reinforcing element for concrete structures which comprises cold rolling a metal rod to provide a series of the rod in the portions thereof least affected by the said cold rolling operation.

3. A, method for the production of a reinforcing element for concrete structures which comprises cold rolling a plurality of metal rods between opposing surfaces of profiled rolls to provide flattened opposite faces having parallel in' dentations therein and producing kneading ac-' ing rod, any variations of strength, which may be due to slight variations of the cross section, in the initial material being equalized. It is a particular advantage of the present invention that the strength (elastic limit) of the rods is improved much beyond that of the known stretch twisted reinforcing elements with a much smaller degree of twisting, i. e. without subjecting the rod to such high stresses. A further advantage is that the reinforcing rods of the present invention have excellent bonding capacity and in this respect are readily distinguishable from smooth surfaced rods.

Reinforcing members having very great bonding capacity may be obtained by twisting together, either with or without simultaneous stretching, two or more of the rods thus far de-. scribed. The rods used may be cold-rolled but untwisted rods as shown in Figures 2 and 3 (b) or rods which have themselves been twisted after cold-rolling as shown in Figures 3 (c), 3 (d), 4

distributed over the whole length of the beam.

I claim: f

1. A method for the production of a reinforcing element for concrete structures which comprises cold rolling a metal rod to alter the cross section thereof and to produce kneading action in the portions of the rod most affected by the cold rolling operation and thereafter cold twisting the rod to improve the tensile strength in the portions of the rod not directly affected by the said cold rolling operation, thereby greatly in-- creasing the tensile strength and elastic limit of the rod.

tion in the portions thereof most affected by the cold rolling operation, cold twisting a plurality of the rods together and simultaneously stretching the rods to increase the tensile strength thereof in the portions least affected by the said cold rolling operation, thereby improving the tensile strength, elastic limit and bonding capacity of the rods.

4. A method for the production of a reinforcing element for concrete structures which comprises cold rolling a round metal rod to provide a flattened cross section having indentations in the oppositely disposed surfaces thereof by means of profiled rolls having inclined parallel projections thereon, the projections on one roll crossing those of the other opposing roll, producing indentations .on opposite faces of the rod inclined at an angle to the helical line of the outer fibres thereof, the indentations on said opposite faces being in crossed relation and cold twisting the. said rod. Y

5. A method for the production of a reinforcing element for concrete structures which comprises cold rolling a metal rod to provide a flattened cross section by means of profiled rolls having inclined parallel projections on each roll, the projections on one roll crossing those of the opposite roll, producing a flattened cross section having parallel indentations on each of the faces thereof, and coldtwisting the rod so that the indentations on one face are inclined substantially at right angles to the helical line of the twisted outer fibres, while those on the other face extend substantially parallel to the helical line of the twisted outer fibres.

6. A method for the production of a reinforcing element for concrete structures which comprises cold rolling a plurality of metal rods to form a flattened cross section in each of the rods and producing a series of parallel notches in the flattened faces of the rods inclined to the axes thereof and thereafter cold twisting the rods together, to increase the tensile strength, bonding capacity and elastic limit of the rod.

. ERNST HOFFMANN.

US2260779A 1937-10-28 1938-10-27 Method of making ferroconcrete reinforcing elements Expired - Lifetime US2260779A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
AT205847X 1937-10-28
AT231137X 1937-11-23
AT270138X 1938-01-27

Publications (1)

Publication Number Publication Date
US2260779A true US2260779A (en) 1941-10-28

Family

ID=27151266

Family Applications (1)

Application Number Title Priority Date Filing Date
US2260779A Expired - Lifetime US2260779A (en) 1937-10-28 1938-10-27 Method of making ferroconcrete reinforcing elements

Country Status (2)

Country Link
US (1) US2260779A (en)
GB (1) GB509378A (en)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2600534A (en) * 1950-10-06 1952-06-17 Hawkinson Paul E Co Method of making coiled wire for use in antiskid pneumatic tire treads
US2716080A (en) * 1950-10-13 1955-08-23 Schwarz Johannes Process for increasing the strength of steel
DE1004212B (en) * 1953-11-07 1957-03-14 Westfalenhuette Ag Process for Heat Treatment of Steel concrete form
US2805470A (en) * 1955-05-05 1957-09-10 Frphikjaer-Jensen Axel Method of making steel reinforcing bars for concrete structures
US2881822A (en) * 1954-11-03 1959-04-14 Henry Maurice Improvement of the tensile strength of metal products
US2933127A (en) * 1958-04-11 1960-04-19 Aerotec Ind Inc Seats for conveyances
US2957240A (en) * 1956-08-17 1960-10-25 Robert A Brandes Method of making concrete reinforcing elements from ribbed steel bars
US3102060A (en) * 1958-12-15 1963-08-27 Schoch Ag Ernst Method for the mechanical twisting of cold-formed profile steels
US3136054A (en) * 1957-04-20 1964-06-09 Baustahlgewebe Gmbh Rod rolling method
US3430406A (en) * 1963-05-06 1969-03-04 Laclede Steel Co Reinforcing mat for use in constructing continuously reinforced concrete slabs
US3770595A (en) * 1970-11-23 1973-11-06 Stephanois Rech Method of treatment of steel parts in order to increase their resistance to wear and abrasion
US4194380A (en) * 1977-06-29 1980-03-25 Andrew Corporation Corrugated elliptical waveguide with permanent twist
US4897117A (en) * 1986-03-25 1990-01-30 Teledyne Industries, Inc. Hardened penetrators
FR2928391A1 (en) * 2008-03-06 2009-09-11 Soc Civ D Brevets Matiere Longitudinal reinforcement bar for reinforcement cage of rectangular sectioned beam in e.g. building, has oblong transversal section provided with flattened large surfaces and round lateral sides, where bar is made of concrete
US20140059975A1 (en) * 2012-09-06 2014-03-06 Chester Wright, III Reinforcement for Reinforced Concrete and Methods for Manufacturing Thereof
US9243406B1 (en) * 2015-01-21 2016-01-26 TS—Rebar Holding, LLC Reinforcement for reinforced concrete
EP2834428A4 (en) * 2012-04-03 2016-03-16 Polytorx Llc Concrete reinforcing fibers

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1265666A (en) * 1969-03-04 1972-03-01
CA2112934A1 (en) * 1993-01-21 1994-07-22 Robert Hugo Jacob Over Reinforcement fibre for reinforcing concrete

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2600534A (en) * 1950-10-06 1952-06-17 Hawkinson Paul E Co Method of making coiled wire for use in antiskid pneumatic tire treads
US2716080A (en) * 1950-10-13 1955-08-23 Schwarz Johannes Process for increasing the strength of steel
DE1004212B (en) * 1953-11-07 1957-03-14 Westfalenhuette Ag Process for Heat Treatment of Steel concrete form
US2881822A (en) * 1954-11-03 1959-04-14 Henry Maurice Improvement of the tensile strength of metal products
US2805470A (en) * 1955-05-05 1957-09-10 Frphikjaer-Jensen Axel Method of making steel reinforcing bars for concrete structures
US2957240A (en) * 1956-08-17 1960-10-25 Robert A Brandes Method of making concrete reinforcing elements from ribbed steel bars
US3136054A (en) * 1957-04-20 1964-06-09 Baustahlgewebe Gmbh Rod rolling method
US2933127A (en) * 1958-04-11 1960-04-19 Aerotec Ind Inc Seats for conveyances
US3102060A (en) * 1958-12-15 1963-08-27 Schoch Ag Ernst Method for the mechanical twisting of cold-formed profile steels
US3430406A (en) * 1963-05-06 1969-03-04 Laclede Steel Co Reinforcing mat for use in constructing continuously reinforced concrete slabs
US3770595A (en) * 1970-11-23 1973-11-06 Stephanois Rech Method of treatment of steel parts in order to increase their resistance to wear and abrasion
US4194380A (en) * 1977-06-29 1980-03-25 Andrew Corporation Corrugated elliptical waveguide with permanent twist
US4897117A (en) * 1986-03-25 1990-01-30 Teledyne Industries, Inc. Hardened penetrators
FR2928391A1 (en) * 2008-03-06 2009-09-11 Soc Civ D Brevets Matiere Longitudinal reinforcement bar for reinforcement cage of rectangular sectioned beam in e.g. building, has oblong transversal section provided with flattened large surfaces and round lateral sides, where bar is made of concrete
EP2834428A4 (en) * 2012-04-03 2016-03-16 Polytorx Llc Concrete reinforcing fibers
US20140059975A1 (en) * 2012-09-06 2014-03-06 Chester Wright, III Reinforcement for Reinforced Concrete and Methods for Manufacturing Thereof
US8915046B2 (en) * 2012-09-06 2014-12-23 Chester Wright, III Reinforcement for reinforced concrete and methods for manufacturing thereof
US9243406B1 (en) * 2015-01-21 2016-01-26 TS—Rebar Holding, LLC Reinforcement for reinforced concrete

Also Published As

Publication number Publication date Type
GB509378A (en) 1939-07-14 application

Similar Documents

Publication Publication Date Title
US3250109A (en) Method for orienting grain flow
US3160249A (en) Linear interlocking key or spline
US3165815A (en) Process for the manufacture of sections
US4944172A (en) Method of making a U-shaped closure tamper evident
US4759994A (en) Sandwich-type stampable, metallic structure
US3201862A (en) Process for making steel-reinforced aluminum members
US2699599A (en) Structural sheet
US3609855A (en) Production of beryllium ribbon reinforced composites
US4367838A (en) Method of producing clad steel articles
US1790178A (en) Fibre board and its manufacture
US2895368A (en) Bolt having rolled grooves and recessed head to enhance uniform elongation
US4241146A (en) Corrugated plate having variable material thickness and method for making same
US3131469A (en) Process of producing a unitary multiple wire strand
US2246578A (en) Trussed structural member and method of and means for its manufacture
US2060593A (en) Metal element and method of making the same
US2788045A (en) Conventional truncated screw threads with small locking thread bonded therebetween
US5689990A (en) Sheet material, method of producing same and rolls for use in the method
US4597278A (en) Method for producing I-beam having centrally corrugated web
US2427176A (en) Method of making cable terminals
US3535871A (en) Method for making chain links
US4317350A (en) Corrugated plate having variable material thickness and method for making same
US20010004825A1 (en) Building elements and building element assemblies formed therewith
US3141358A (en) Method for forming spinning orifices in spinneret plate structures
US3079681A (en) Method of making a joint
US2617179A (en) Method of manufacturing tapered beams