CA1143962A - Concrete-reinforcing rod, particularly anchor rod, and method of manufacturing it - Google Patents
Concrete-reinforcing rod, particularly anchor rod, and method of manufacturing itInfo
- Publication number
- CA1143962A CA1143962A CA000353881A CA353881A CA1143962A CA 1143962 A CA1143962 A CA 1143962A CA 000353881 A CA000353881 A CA 000353881A CA 353881 A CA353881 A CA 353881A CA 1143962 A CA1143962 A CA 1143962A
- Authority
- CA
- Canada
- Prior art keywords
- rod
- ribs
- thread
- screw
- 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
Links
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
- Road Signs Or Road Markings (AREA)
- Dowels (AREA)
Abstract
ABSTRACT
A concrete-reinforcing rod, in particular an anchoring rod with helically-travelling ribs which form a partial screw-thread upon which an anchoring body can be screwed. The rod is formed such that the screw-thread partial pieces of successive screw thread courses, preferably extending over more than half of the circumference of the rod, are displaced or staggered continuously with relation to one another, and such that each gap between the screw-thread partial pieces is at least partially covered over by a screw-thread partial piece of the following screw-thread course. In this way, the screw-thread partial pieces which form a self-arresting screw-thread run helically around the rod.
A concrete-reinforcing rod, in particular an anchoring rod with helically-travelling ribs which form a partial screw-thread upon which an anchoring body can be screwed. The rod is formed such that the screw-thread partial pieces of successive screw thread courses, preferably extending over more than half of the circumference of the rod, are displaced or staggered continuously with relation to one another, and such that each gap between the screw-thread partial pieces is at least partially covered over by a screw-thread partial piece of the following screw-thread course. In this way, the screw-thread partial pieces which form a self-arresting screw-thread run helically around the rod.
Description
~ ~3~
CONCRETE-REINFORCING ROD, PARTICULARLY ANCHOR P~OD, AND METHOD
OF MANUFACTURING IT
. _ The invention relates to a concrete-reinforcing rod, part-icularly an anchor rod, with helically-shaped ribs which form partial pieces of a screw-thread, upon which an anchoring body, provided with a corresponding counter-screw-thread, can be screwed, as well as to a method of manufacturing i-t.
A reinforcing rod is known from United States patent No. 1,151,947; on i-ts surface are provided ribs traveling at a steep angle to the longitudinal axis of the rod. These ribs are disposed in groups; the ribs of successive groups being directed toward one ano-ther and partially overlapping. Aside from the too-great pitch of the ribs, the effect of a screw-thread canno-t be attained, even approximately, by means of the opposing orientation of the same. In the reinforcing rod according to German patent No. ~
1,077,854, the profilings in the form of ribs, customary for improving adhesion in -the concrete, are so disposed that they lie on a helix and orm part of a screw-thread. In this way, no chip-removing work, such as incising, or non-cutting forming work, like rolling up~a screw-thread cold on the ends of the rods, was necessary any longer for installing screwable connecting and/or anchoring bodies.
Reinforcing rods of this sort have been manufactured in such a manner that the ribs, which forrn a partial screw-thread, lay only on one side of the rod, while the opposite side of the rod remained smooth. The unilateral introduction of force thus brought about had an unfavorable influence on the fatigue strength of the ; ~ `~
rod. A further drawback of this rein~orcin~ rod lies in the fact that, because of the opposite smooth side of the rod, it cannot;
be inserted as rib s-teel in normal steel-concrete construction.
:' "
~ , ;~-` ~
`: :
:~
The reinforcing rod according to German patent No. 1,199,470 voids some of these drawbacks. On the side of the rod opposite the ribs, it possesses cavities (or recesses, or indentations) like-wise formed in the path of a warm rolling process, between which ribs remain standing, which are so disposed that their external boundary lies on the continuation of the circular cylinder surface of the other side of the rod, which forms the core of the rod. In their position with relation to the ribs on the opposite side of the rod, which form a partial screw-thread, these ribs between the recesses are so disposed that a screwed-on connecting or anchoring body lies with its internal surface on the external boundary of these ribs.
However, this does not result in a flawless connection. This steel rod, which indeed is suited for use as a simple concreie-reinforcing rod, because it has profilings on both sides, is disadvantageous in the use of anchoring or connecting bodies as a result of the uni-lateral introduction of force. Because of its asymmetrical form of cross-section, it is also difficult to align (or straighten) it in so-called aligning (or straightening) machines. Besides, its manufacture turns out to be difficult because the surfaces on the opposite sides of the rod, which surfaces are to be rolled, are at different distances from the axis of the rod and necessi`tate different surface velocities of the roLlers required from manufacture.
A Eurther problem in the manufacture of concrete-reinforcing rods with hot-rolled ribs which form a part:ial screw-thread reside5 in variations in texture in the steel which occur in rolling the ribs and which result in differences in tensile strength. These differences in tensile strength appear primaril~ in the area of points at which the individual rib grows upwardly out of the surface of the rod.
Notch tensions occur at this point, which lead to diminution of the breadth of oscillation of the rod.
These notching tensions act most strongly when the ribs run perpendicularly to the longitudinal direction of the rod, when their adhesion-improving effect is naturally at its greatest. In this case, the material of the ribs must be considered as a dead weight, because a cross-section perpendicular to the ~xis of the rod does not necessarily intersect--------------------------------------a rib. No notching tenslons occur when the ribs run in the longi-udinal direction of the rod, and the material of the ribs can be added fully to the cross-section of the rod; ho~ever, an adhesion-improving efEect does not take place then, because there is no direct support on the concrete. For this reason, the ribs are disposed inclined to the longitudinal axis of the rod in the case of concrete-reinforcing steels. In general, this inclination amounts to between 40 and 60 degrees. Then the cross-section projection of the ribs can be relied upon for the adhesion-improving effect, while the notching tensions are kept within bounds.
If the ribs lie on a helix and are designed to form a screw-thread, then the inclination of the ribs to the longitudinal axis of the rod may not be greater than that an anchoring body reliably obstructs with its internal screw-thread adapted to the partial screw-thread. However, the pitch of the screw-thread ribs which is possible under this condition is then so small that notching tensions cannot be avoided, and the material of the ribs cannot be added to the carrying cross-section surface. The result is smaller width oE oscillation oE the rod and poorer utilization of the material.
Experiments to diminish the unfavorable effects of the notching tensions on the width of oscillation by rounding off the profile of the ribs have not led to the desired result. Moreover, specially-shaped tools are necessary, and the service life of the rollers must he kept very short in order to ma:intain the required profile with certainty, which means increased ~leed for tools.
~ccording to German patent No. 1,659,067, the helically-disposed ribs are arranged in the form of a double-thread screw-thread on two opposite sides of the circumference of the rod. The double-thread screw-thread makes possible the manufacture of a steeper pitch of screw-thread and, therewith, a rod which can be manufactured better, roller-technically. A disadvantage is the small and insufficient extent of height of the full screw-thread with relation to the circumference of the rod~ As may be seen from a com-parison of FIGS. 2 and 3 of the said patent, the height of the rib depends decisiveIy on the angle to the longitudinal axis. The flatter the an~le of the rolled rib, the flatter, lower, and less---~
:: .
3~
~istinctly can the latter be rolled~ Added to this is the furtherdrawback that the -transmission of force to the counter-screw-thread in the nut (or Eemale screw), conditioned by the short screw-thread segments, lying one behind another in longitudinal direction, and only slightly raised (or in relief~, takes place only to an in-sufficient extent. As a result of the unavoidable roller tolerances, which also must be taken into consideration in the counter-screw-thread, the small, utilizable surface of the screw-thread segments is diminished still further.
The reinforcing rod of United States patent No. 4,137,686 also exhibits the same disadvantage of relatively short height of screw-thread with reference to the circumference of the rod and the segments of screw-thread lying spaced one behind another in the longi-tudinal axis of the rod.
An aspect of the invention is to avoid these drawbacks. In the case of a reinforcing rod or anchoring rod of the initially-described type, this is attained by arranging the screw-thread partial pieces of successive screw-threads, which pxeferably extend over more than half of the circumference of the rod, in a continually-staggered manner with relation to one another, and by at least partially covering over the gap between the screw-thread partial pieces by means of a screw-thread partial piece of the following screw-thread, so that the screw-thread partial pieces which form a selE-arresting screw-thread, or the gaps, run helically around the rod. The manufacture of such a rod takes place in such a manner that a rod blank (or unworked piece) with rolled ribs running diagonally to the longitudinal axis of the rod, the ribs being oriented in one direction and preferably including an angle of 40 to 60 degrees to the longitudinal axis of the rod, is subjected to a torsion in order to form the self-arresting (or self-blocking, or self-obstructing) screw-thread consisting of screw-thread partial pieces.
In the first stage of the process, a rod blank is warm-rolled with ribs. However, the ribs situated on the two opposite sides are not arran~ed at an opposing angle, in known manner; rather, they wind in a coil around the rod. secause of the oblique angle to 3~2, longitudinal axis, -the ribs, while avoiding any notching tensions in the rod, can be rolled to be not only very long, but also relatively high and distinct. In the second and essential stage of the process, the rib steel is twisted or torsioned in the direction in which the ribs are inclined. In that way, the angle of the ribs becomes ever flatter with increasing twisting, so that a functional, self-arresting screw-thread now originates from the original coil-shaped arrangement of the ribs; it is advantageous that the ribs, already originally long, become still longer because of expansion of the steel resulting from the torsion and reach over more than half of the circumference of the rod.
This now-formed screw-thread partial piece is displaced (or staggered) in a clockwise direction with relation to the next one, so that every individual screw-thread-rib gap is covered over by the next screw-thread partial piece. The pitch of the serew-thread is continuously (or stagelessly) manufacturable in accordance with the degree of torsion. Right-hand or left-hand screw-threads are possible, according to the position of the ribs and corresponding direction of torsion.
Accordingly, this invention provides a concrete reinforcement comprising a steel rod formed along its circumference with a succession of ribs forming screw thread sections lying along a helix and engageable by a female thread, said sections being separated by uniformly spaced gaps disposed along a continuous helical track coaxial with said rod, successive sections overlapping the gaps of the next section in axial projection, said sections forming collectively a self-locking screw thread.
3~
Embodiments of the subject matter of the invention are represented in the drawings, which also illustrate thè process in accordance with the invention. Fig. 1 shows a portion of an anchoring rod before the torsion treatment, Fig. 2 shows the same after the torsion, and Fig. 3 shows a series of possible forms of ribs.
The rod 1 according to Fig. 1 has ribs 2, which are arranged on opposite sides of the surface of the rod.
The ribs 2 enclose an angle of about 45 degrees with the longi-tudinal axis of the rod. They are manufactured in the warm-rolling process. As a result of their oblique position, the ribs 2 are relatively long but, because of gaps 3 existing between the ribs 2, embrace less than half of the circumference of the rod. The gaps 3 between -the ribs lie diametrally on the circumference oE the rod along a generatrix of the cylinder which forms the rod 1. The manufacture of the rod 1 shown in Fig. 1 is possible wi-th any preferred forms of ribs, and also with distinct heights, without any problems.
- 5a -Z
The rod 1 is then twisted or torsioned - that is, the od is twisted within itself - so that displacement of the surface elements occurs, and , in connection therewith, the steel is strength-ened, and thè rod is simultaneously straightened (or aligned). Then a rod 4 in accordance with FIG. 2 exists as a product of the process, its ribs now forming flat screw-thread partial pieces _ lying closely adjacent one another. The gaps 6 no longer lie along a generatrix, as shown in FIG. l; rather, they are displacedly arranged along a helix on the rod. Because of expansion by reason of torsion, the screw thread partial pieces _ resulting from the ribs 2 (Fig. 1) embrace more than half of the circumference of the rod. Adjacent screw thread partial pieces _ of the next screw-thread course are displaced (or staggered) in such a manner that the screw thread partial pieces overlap in axial projection, and therefore a screwed-on screw nut, with its counter threading over a large extent, is in engagement with the rod 4. Only because of the torsion does a screw-thread which is self-arresting, and which is of sufficient stability, originate from the originally diagonal ribs, which have no sort of screw-thread function.
FIG. 3 represents examples of cross section forms of screw-thread courses which are suited especially for the manufacture of reinforcing rods.
CONCRETE-REINFORCING ROD, PARTICULARLY ANCHOR P~OD, AND METHOD
OF MANUFACTURING IT
. _ The invention relates to a concrete-reinforcing rod, part-icularly an anchor rod, with helically-shaped ribs which form partial pieces of a screw-thread, upon which an anchoring body, provided with a corresponding counter-screw-thread, can be screwed, as well as to a method of manufacturing i-t.
A reinforcing rod is known from United States patent No. 1,151,947; on i-ts surface are provided ribs traveling at a steep angle to the longitudinal axis of the rod. These ribs are disposed in groups; the ribs of successive groups being directed toward one ano-ther and partially overlapping. Aside from the too-great pitch of the ribs, the effect of a screw-thread canno-t be attained, even approximately, by means of the opposing orientation of the same. In the reinforcing rod according to German patent No. ~
1,077,854, the profilings in the form of ribs, customary for improving adhesion in -the concrete, are so disposed that they lie on a helix and orm part of a screw-thread. In this way, no chip-removing work, such as incising, or non-cutting forming work, like rolling up~a screw-thread cold on the ends of the rods, was necessary any longer for installing screwable connecting and/or anchoring bodies.
Reinforcing rods of this sort have been manufactured in such a manner that the ribs, which forrn a partial screw-thread, lay only on one side of the rod, while the opposite side of the rod remained smooth. The unilateral introduction of force thus brought about had an unfavorable influence on the fatigue strength of the ; ~ `~
rod. A further drawback of this rein~orcin~ rod lies in the fact that, because of the opposite smooth side of the rod, it cannot;
be inserted as rib s-teel in normal steel-concrete construction.
:' "
~ , ;~-` ~
`: :
:~
The reinforcing rod according to German patent No. 1,199,470 voids some of these drawbacks. On the side of the rod opposite the ribs, it possesses cavities (or recesses, or indentations) like-wise formed in the path of a warm rolling process, between which ribs remain standing, which are so disposed that their external boundary lies on the continuation of the circular cylinder surface of the other side of the rod, which forms the core of the rod. In their position with relation to the ribs on the opposite side of the rod, which form a partial screw-thread, these ribs between the recesses are so disposed that a screwed-on connecting or anchoring body lies with its internal surface on the external boundary of these ribs.
However, this does not result in a flawless connection. This steel rod, which indeed is suited for use as a simple concreie-reinforcing rod, because it has profilings on both sides, is disadvantageous in the use of anchoring or connecting bodies as a result of the uni-lateral introduction of force. Because of its asymmetrical form of cross-section, it is also difficult to align (or straighten) it in so-called aligning (or straightening) machines. Besides, its manufacture turns out to be difficult because the surfaces on the opposite sides of the rod, which surfaces are to be rolled, are at different distances from the axis of the rod and necessi`tate different surface velocities of the roLlers required from manufacture.
A Eurther problem in the manufacture of concrete-reinforcing rods with hot-rolled ribs which form a part:ial screw-thread reside5 in variations in texture in the steel which occur in rolling the ribs and which result in differences in tensile strength. These differences in tensile strength appear primaril~ in the area of points at which the individual rib grows upwardly out of the surface of the rod.
Notch tensions occur at this point, which lead to diminution of the breadth of oscillation of the rod.
These notching tensions act most strongly when the ribs run perpendicularly to the longitudinal direction of the rod, when their adhesion-improving effect is naturally at its greatest. In this case, the material of the ribs must be considered as a dead weight, because a cross-section perpendicular to the ~xis of the rod does not necessarily intersect--------------------------------------a rib. No notching tenslons occur when the ribs run in the longi-udinal direction of the rod, and the material of the ribs can be added fully to the cross-section of the rod; ho~ever, an adhesion-improving efEect does not take place then, because there is no direct support on the concrete. For this reason, the ribs are disposed inclined to the longitudinal axis of the rod in the case of concrete-reinforcing steels. In general, this inclination amounts to between 40 and 60 degrees. Then the cross-section projection of the ribs can be relied upon for the adhesion-improving effect, while the notching tensions are kept within bounds.
If the ribs lie on a helix and are designed to form a screw-thread, then the inclination of the ribs to the longitudinal axis of the rod may not be greater than that an anchoring body reliably obstructs with its internal screw-thread adapted to the partial screw-thread. However, the pitch of the screw-thread ribs which is possible under this condition is then so small that notching tensions cannot be avoided, and the material of the ribs cannot be added to the carrying cross-section surface. The result is smaller width oE oscillation oE the rod and poorer utilization of the material.
Experiments to diminish the unfavorable effects of the notching tensions on the width of oscillation by rounding off the profile of the ribs have not led to the desired result. Moreover, specially-shaped tools are necessary, and the service life of the rollers must he kept very short in order to ma:intain the required profile with certainty, which means increased ~leed for tools.
~ccording to German patent No. 1,659,067, the helically-disposed ribs are arranged in the form of a double-thread screw-thread on two opposite sides of the circumference of the rod. The double-thread screw-thread makes possible the manufacture of a steeper pitch of screw-thread and, therewith, a rod which can be manufactured better, roller-technically. A disadvantage is the small and insufficient extent of height of the full screw-thread with relation to the circumference of the rod~ As may be seen from a com-parison of FIGS. 2 and 3 of the said patent, the height of the rib depends decisiveIy on the angle to the longitudinal axis. The flatter the an~le of the rolled rib, the flatter, lower, and less---~
:: .
3~
~istinctly can the latter be rolled~ Added to this is the furtherdrawback that the -transmission of force to the counter-screw-thread in the nut (or Eemale screw), conditioned by the short screw-thread segments, lying one behind another in longitudinal direction, and only slightly raised (or in relief~, takes place only to an in-sufficient extent. As a result of the unavoidable roller tolerances, which also must be taken into consideration in the counter-screw-thread, the small, utilizable surface of the screw-thread segments is diminished still further.
The reinforcing rod of United States patent No. 4,137,686 also exhibits the same disadvantage of relatively short height of screw-thread with reference to the circumference of the rod and the segments of screw-thread lying spaced one behind another in the longi-tudinal axis of the rod.
An aspect of the invention is to avoid these drawbacks. In the case of a reinforcing rod or anchoring rod of the initially-described type, this is attained by arranging the screw-thread partial pieces of successive screw-threads, which pxeferably extend over more than half of the circumference of the rod, in a continually-staggered manner with relation to one another, and by at least partially covering over the gap between the screw-thread partial pieces by means of a screw-thread partial piece of the following screw-thread, so that the screw-thread partial pieces which form a selE-arresting screw-thread, or the gaps, run helically around the rod. The manufacture of such a rod takes place in such a manner that a rod blank (or unworked piece) with rolled ribs running diagonally to the longitudinal axis of the rod, the ribs being oriented in one direction and preferably including an angle of 40 to 60 degrees to the longitudinal axis of the rod, is subjected to a torsion in order to form the self-arresting (or self-blocking, or self-obstructing) screw-thread consisting of screw-thread partial pieces.
In the first stage of the process, a rod blank is warm-rolled with ribs. However, the ribs situated on the two opposite sides are not arran~ed at an opposing angle, in known manner; rather, they wind in a coil around the rod. secause of the oblique angle to 3~2, longitudinal axis, -the ribs, while avoiding any notching tensions in the rod, can be rolled to be not only very long, but also relatively high and distinct. In the second and essential stage of the process, the rib steel is twisted or torsioned in the direction in which the ribs are inclined. In that way, the angle of the ribs becomes ever flatter with increasing twisting, so that a functional, self-arresting screw-thread now originates from the original coil-shaped arrangement of the ribs; it is advantageous that the ribs, already originally long, become still longer because of expansion of the steel resulting from the torsion and reach over more than half of the circumference of the rod.
This now-formed screw-thread partial piece is displaced (or staggered) in a clockwise direction with relation to the next one, so that every individual screw-thread-rib gap is covered over by the next screw-thread partial piece. The pitch of the serew-thread is continuously (or stagelessly) manufacturable in accordance with the degree of torsion. Right-hand or left-hand screw-threads are possible, according to the position of the ribs and corresponding direction of torsion.
Accordingly, this invention provides a concrete reinforcement comprising a steel rod formed along its circumference with a succession of ribs forming screw thread sections lying along a helix and engageable by a female thread, said sections being separated by uniformly spaced gaps disposed along a continuous helical track coaxial with said rod, successive sections overlapping the gaps of the next section in axial projection, said sections forming collectively a self-locking screw thread.
3~
Embodiments of the subject matter of the invention are represented in the drawings, which also illustrate thè process in accordance with the invention. Fig. 1 shows a portion of an anchoring rod before the torsion treatment, Fig. 2 shows the same after the torsion, and Fig. 3 shows a series of possible forms of ribs.
The rod 1 according to Fig. 1 has ribs 2, which are arranged on opposite sides of the surface of the rod.
The ribs 2 enclose an angle of about 45 degrees with the longi-tudinal axis of the rod. They are manufactured in the warm-rolling process. As a result of their oblique position, the ribs 2 are relatively long but, because of gaps 3 existing between the ribs 2, embrace less than half of the circumference of the rod. The gaps 3 between -the ribs lie diametrally on the circumference oE the rod along a generatrix of the cylinder which forms the rod 1. The manufacture of the rod 1 shown in Fig. 1 is possible wi-th any preferred forms of ribs, and also with distinct heights, without any problems.
- 5a -Z
The rod 1 is then twisted or torsioned - that is, the od is twisted within itself - so that displacement of the surface elements occurs, and , in connection therewith, the steel is strength-ened, and thè rod is simultaneously straightened (or aligned). Then a rod 4 in accordance with FIG. 2 exists as a product of the process, its ribs now forming flat screw-thread partial pieces _ lying closely adjacent one another. The gaps 6 no longer lie along a generatrix, as shown in FIG. l; rather, they are displacedly arranged along a helix on the rod. Because of expansion by reason of torsion, the screw thread partial pieces _ resulting from the ribs 2 (Fig. 1) embrace more than half of the circumference of the rod. Adjacent screw thread partial pieces _ of the next screw-thread course are displaced (or staggered) in such a manner that the screw thread partial pieces overlap in axial projection, and therefore a screwed-on screw nut, with its counter threading over a large extent, is in engagement with the rod 4. Only because of the torsion does a screw-thread which is self-arresting, and which is of sufficient stability, originate from the originally diagonal ribs, which have no sort of screw-thread function.
FIG. 3 represents examples of cross section forms of screw-thread courses which are suited especially for the manufacture of reinforcing rods.
Claims (8)
1. A concrete reinforcement comprising a steel rod formed along its circumference with a succession of ribs forming screw thread sections lying along a helix and engageable by a female thread, said sections being separated by uniformly spaced gaps disposed along a continuous helical track coaxial with said rod, successive sections overlapping the gaps of the next section in axial projection, said sections forming collectlvely a self-locking screw thread.
2. The reinforcement defined in claim 1 wherein said sections each extend over more than half the circumference of the rod.
3. The reinforcement defined in claim 2 wherein said sections are of triangular cross section.
4. The reinforcement defined in claim 2 wherein said sections are of trapezoidal cross section.
5. A method of making a reinforcing rod, comprising the steps of:
(a) rolling a steel blank with respective inclining ribs having a common inclination on opposite sides of a bar, said ribs including a 40 to 60° angle with the axis of said bar and the ribs on opposite sides of the bar being separated by gaps lying at most two diametrically opposite generatrices of the bar; and (b) twisting said bar to steepen the angles of each rib included with the axis of the bar and offset said gaps along a helical track while bringing said ribs closer together so that said ribs lie along a helix and form a self-locking screw thread.
(a) rolling a steel blank with respective inclining ribs having a common inclination on opposite sides of a bar, said ribs including a 40 to 60° angle with the axis of said bar and the ribs on opposite sides of the bar being separated by gaps lying at most two diametrically opposite generatrices of the bar; and (b) twisting said bar to steepen the angles of each rib included with the axis of the bar and offset said gaps along a helical track while bringing said ribs closer together so that said ribs lie along a helix and form a self-locking screw thread.
6. The method defined in claim 5 wherein said bar is subjected to a degree of twisting determined by the pitch angle desired for said screw thread.
7. The method defined in claim 5 wherein said ribs have a triangular cross section.
8. The method defined in claim 5 wherein said ribs have a trapezoidal cross section.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ATA4258/79 | 1979-06-15 | ||
| AT425879A ATA425879A (en) | 1979-06-15 | 1979-06-15 | CONCRETE REINFORCING BAR, ESPECIALLY ANCHOR BAR, AND METHOD FOR THE PRODUCTION THEREOF |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1143962A true CA1143962A (en) | 1983-04-05 |
Family
ID=3561686
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000353881A Expired CA1143962A (en) | 1979-06-15 | 1980-06-12 | Concrete-reinforcing rod, particularly anchor rod, and method of manufacturing it |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS563745A (en) |
| AT (1) | ATA425879A (en) |
| BR (1) | BR8003693A (en) |
| CA (1) | CA1143962A (en) |
| DE (1) | DE3022085A1 (en) |
| GB (1) | GB2054695A (en) |
| NO (1) | NO801776L (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102363152A (en) * | 2011-10-14 | 2012-02-29 | 山东焱鑫矿用材料加工有限公司 | Production equipment of steel for non-cold processing joint |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3730490A1 (en) * | 1987-09-11 | 1989-03-23 | Dyckerhoff & Widmann Ag | HOT ROLLED CONCRETE REINFORCING BAR, PARTICULARLY CONCRETE RIB BAR |
| AUPO219296A0 (en) * | 1996-09-06 | 1996-10-03 | Alan H. Reid Pty Ltd | Threaded fastener having insertion depth indicator |
| AUPS266202A0 (en) * | 2002-05-30 | 2002-06-20 | Industrial Rollformers Pty Limited | Threaded bar |
| CN102102424A (en) * | 2011-03-03 | 2011-06-22 | 天津市银龙预应力钢材集团有限公司 | Spine-free reinforcing steel bar with interrupted spiral ribs |
| CN102764764B (en) * | 2011-05-06 | 2015-01-14 | 豫北转向系统股份有限公司 | Rolling wheel of spline with heterodont tooth and method for processing spline |
| CN102430675B (en) * | 2011-10-14 | 2014-04-09 | 山东焱鑫矿用材料加工有限公司 | Method for producing steel for non-cold machining connection |
| CN106049763B (en) * | 2016-07-27 | 2018-08-31 | 中国建筑第八工程局有限公司 | The Ribbed Bar that cross rib is staggered |
| CN106523007A (en) * | 2016-12-20 | 2017-03-22 | 辽宁工程技术大学 | Anchor rod body transverse rib structure used for promoting anchoring force |
-
1979
- 1979-06-15 AT AT425879A patent/ATA425879A/en not_active Application Discontinuation
-
1980
- 1980-06-12 CA CA000353881A patent/CA1143962A/en not_active Expired
- 1980-06-12 GB GB8019307A patent/GB2054695A/en not_active Withdrawn
- 1980-06-12 DE DE3022085A patent/DE3022085A1/en not_active Withdrawn
- 1980-06-13 JP JP7915180A patent/JPS563745A/en active Pending
- 1980-06-13 NO NO801776A patent/NO801776L/en unknown
- 1980-06-13 BR BR8003693A patent/BR8003693A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102363152A (en) * | 2011-10-14 | 2012-02-29 | 山东焱鑫矿用材料加工有限公司 | Production equipment of steel for non-cold processing joint |
Also Published As
| Publication number | Publication date |
|---|---|
| BR8003693A (en) | 1981-01-13 |
| JPS563745A (en) | 1981-01-16 |
| DE3022085A1 (en) | 1981-02-05 |
| NO801776L (en) | 1980-12-16 |
| ATA425879A (en) | 1980-03-15 |
| GB2054695A (en) | 1981-02-18 |
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