WO1997010391A1 - Coupling arrangements for concrete reinforcement bars - Google Patents
Coupling arrangements for concrete reinforcement bars Download PDFInfo
- Publication number
- WO1997010391A1 WO1997010391A1 PCT/US1996/007425 US9607425W WO9710391A1 WO 1997010391 A1 WO1997010391 A1 WO 1997010391A1 US 9607425 W US9607425 W US 9607425W WO 9710391 A1 WO9710391 A1 WO 9710391A1
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- WIPO (PCT)
- Prior art keywords
- end segment
- bar
- reinforcement bar
- reinforcement
- splice
- Prior art date
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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
Definitions
- the present invention relates to arrangements for coupling reinforcement bars used in concrete construction, and, more particularly, to reinforcement bars having a threaded end segment for engaging a coupling element and a stop member located immediately adjacent thereto in order to prevent threading of the coupling element past the end segment.
- Reinforcement bars, or rebars have been in widespread use for many years as reinforcing elements in poured or cast concrete structures.
- reinforcement bars In the construction of large structures, where large concrete form work is carried out in steps or stages, it is advantageous to connect or splice together reinforcement bars at each stage in order to achieve a monolithic concrete structure. Accordingly, this may be accomplished by the splicing together of adjacent reinforcement bars either directly (via end-to-end coupling) or indirectly through an intermediate setting-splice bar arrangement.
- U.S. patent 5,152,118 to Lancelot discloses a coupling arrangement for concrete reinforcement bars where the rebar includes an upset end with a larger diameter than the rebar body and having threads cut therein for mating engagement with a coupler.
- the diameter of the upset end and its threading is sized to enable the coupler to clear the ribbing of the rebar.
- the rebar ribbing immediately adjacent the threaded upset end is flattened to otherwise enable the coupler to extend past the threaded upset end into the coupler.
- a dowel bar replacement system which includes a coupler having a positive stop within its interior to prevent the threaded end of a rebar from entering too far therein and damaging the ribbing on the outside surface of the rebar, as well as insuring proper thread engagement for full connection capacity.
- the Dayton Superior system discloses a first setting-splice bar which is tied to an existing reinforcement bar in the concrete structure at one end and is then coupled to a second setting-splice bar at the opposite end so as to provide a connection with an adjacent reinforcement bar of a separate stage.
- a problem of primary concern is prevention of a coupler from engaging the ribbing on a rebar element.
- U.S. patent 5,152,118 even a small cut or nick in the ribbing of the rebar produces a "cherpe" effect, by which stress force acting along the rebar is focused or concentrated by relatively minute changes in the geometry of the rebar.
- Even a shallow thread cut in the ribs has been found to create a plane of weakening in the rebar, and under protracted cyclic loading of the rebar, as may occur for example on a concrete bridge subject to heavy loads moving across it, creates a metal fatigue condition at the site of the surface cut which in turn eventually leads to structural failure of the rebar.
- the first as disclosed by U.S. patent 5,152,118 is to allow a coupling member to extend past a threaded end over the ribbing of a rebar without engaging it.
- the second approach as described with regard to the Dayton Superior dowel bar replacement system above, is to prevent a rebar from entering a coupling element past a threaded end. It has been found, that while each of these coupling arrangements perform their intended purpose, that certain disadvantages are associated with each. For example, the first mentioned system is utilized with respect to reinforcement bars of somewhat substantial length.
- a coupling arrangement to be developed which not only avoids the problems associated with rebars of substantial length, but is also flexible in its application so that standard coupling elements may be utilized. Moreover, it would be advantageous if a coupling arrangement for rebars would include a useable surface onto which tools could be engaged for tightening the rebar to a coupling element.
- Still another objective of the present invention is to provide a coupling arrangement for reinforcement bars in concrete construction which includes a useful surface for a tool to tighten the connection between the rebars and a coupler.
- Another objective is to provide a coupling arrangement which provides mechanical capacity equivalent to that of the spliced bar.
- Yet another objective of the present invention is to provide a coupling arrangement for reinforcement bars used in concrete construction which is flexible for completing the splice between adjacent reinforcement bars without regard to their relative orientation.
- Still another objective of the present invention is to provide a coupling arrangement for reinforcement bars in concrete construction which reduces formwork erection and stripping costs.
- a further objective of the present invention is to provide a coupling arrangmenet which reduces form penetration, and therefore grout leakage and honeycombing, which improves the architectural finish of the concrete.
- a reinforcement bar used in poured concrete construction which includes a cylindrical body of nominal diameter with raised ribbing extending on the body between two opposite ends.
- the reinforcement bar has an end segment at one of the ends which includes a thread thereon for engaging an internally threaded coupling element.
- a stop member is located immediately adjacent to the end segment to prevent threading of the coupling element past the end segment.
- the stop member includes an outer surface, such as annular, square or hexagonal, which is configured to be utilized by a tool.
- a second aspect of the present invention involves a three-piece splice between adjacent ends of two reinforcement bars used in poured concrete construction, where the splice includes a first reinforcement bar and a second reinforcement bar, each rebar having a cylindrical body of nominal diameter with raised ribbing extending thereon between two opposite ends. Both the first and second reinforcement bars have an end segment at one of the ends which includes a male thread thereon.
- a coupling sleeve open at opposite ends and internally threaded continuously between the ends for mating with the male threads of the first and second reinforcement bar end segments, is also provided.
- At least one of the first and second reinforcement bars includes a stop member located immediately adjacent to its respective end segment to prevent threading of the coupling sleeve past the respective end segment.
- the first and second reinforcement bars may each include a second end segment at the other of the respective ends, wherein the second end segment includes a male thread thereon for engaging a separate coupling sleeve.
- a second stop member located immediately adjacent to the second end segment may be provided to prevent threading of the separate coupling sleeve past the second end segment.
- a third aspect of the present invention is a setting-splice bar used to provide a structural connection between a reinforcement bar and a coupling element in poured concrete construction.
- the setting- splice bar includes a cylindrical body of nominal diameter with raised ribbing extending on the body between two opposite ends, the bar having an end segment at one of the ends which includes a thread thereon for engaging the coupling member.
- a stop member is located immediately adjacent to the end segment to prevent threading of the coupling element past the end segment.
- a pair of setting-splice bars may be utilized with a coupling element to provide a structural connection between rebars of adjacent stages.
- Fig. 1 is a partial longitudinal front view of a reinforcement bar in accordance with the present invention
- Fig. 2 is a side view of the reinforcement bar of Fig. 1;
- Fig. 3 is a partial longitudinal front view of a three-piece splice of two reinforcement bars like that depicted in Figs. 1 and 2, where the coupling element has been broken away for clarity;
- Fig. 4 is a partial longitudinal front view of a pair of setting-splice bars used to indirectly connect adjacent reinforcement bars in separate stages of concrete construction, wherein the left portion depicts a setting-splice bar having a 90 * hook therein and the right portion depicts a linear setting-splice bar;
- Fig. 5 is a partial longitudinal front view of a pair of setting-splice bars used to indirectly connect adjacent reinforcement bars in separate stages of concrete construction, wherein the left portion depicts a setting-splice bar having a 90 * hook therein and the right portion depicts a setting-splice bar having a 180' hook therein;
- Fig. 6 is a partial longitudinal front view of a reinforcement bar having a first alternative design
- Fig. 7 is a side view of the reinforcement bar of Fig. 6;
- Fig. 8 is a partial longitudinal front view of a reinforcement bar having a second alternative design;
- Fig. 9 is a side view of the reinforcement bar of Fig. 8.
- Fig. 1 depicts a reinforcement bar 10 of the type suitable for use in poured concrete construction.
- Reinforcement bar 10 preferably is fabricated from ASTM- A615 grade 60 reinforcing steel. It will be noted that reinforcement bar 10 has a cylindrical body 12 of nominal diameter d, with raised ribbing 14 extending thereacross between two opposite ends 13 and 15. Reinforcement bar 10 has an end segment 16 at end 13 which includes a thread 18 thereon for engaging an internally threaded coupling element 20 as shown in Fig. 3.
- Reinforcement bar 10 also includes a stop member 22 located immediately adjacent to end segment 16 to prevent threading of coupling element 20 past end segment 16. Most importantly, stop member 22 prevents coupling element 20 from engaging ribbing 14 in order to prevent any small cuts or nicks therein.
- stop member 22 may have any of several sahpes and designs such as circular, elliptical, or square, but as best seen in Fig. 2, is shown as having the design of a hexagonal nut . Accordingly, stop member 22 has a hexagonal outer surface 24 which may be utilized by a wrench or other tool for tightening the connection between reinforcement bar 10 and coupling member 20. Stop member 22 is affixedly positioned on reinforcement bar 10, such as by welding or forging an individual element thereto or cold forming stop member 22 thereon. In any case, it will be understood that stop member 22 will not be moved from its position on reinforcement bar 10 adjacent end segment 16 so that coupling element 20 will be prevented from extending past end segment 16 and onto ribbing 14.
- end segment 16 may have a diameter d ; larger than nominal diameter d x of reinforcement bar 10, whereby end segment 16 has what is known as an upset enlarged end.
- thread 18 formed on end segment 16 has a thread diameter d 3 at least as great as nominal diameter d, to preserve the tensile strength of reinforcement bar 10.
- thread diameter d 3 be intermediate nominal diameter d : and a maximum diameter d 4 of reinforcement bar 10 taken across ribbing 14.
- the preferred relationship of the diameters for reinforcement bar 10 are applicable whether the threads are cut into or rolled on reinforcement bar 10.
- stop member 22 will perform its intended purpose so long as the outer diameter d 5 of stop member 22 is greater than the inside diameter of coupling element 20 (same as threaded diameter d 3 ) .
- reinforcement bar 10 may include a second end segment 26 at end 15, with second end segment 26 also including a thread 28 thereon for engaging a second internally threaded coupling element 30 in a separate stage of the concrete construction.
- a second stop member 32 is located immediately adjacent to second end segment 26 to prevent the threading of second coupling element 30 past second end segment 26.
- the relationships between the diameters of second stop member 32 and coupling element 30 will be such as to prevent coupling element 30 from extending past second end segment 26.
- the relationships between the diameters of second end segment 26, thread 28, and reinforcement bar 10 will be as described above with respect to diameters d lf d 2 , and d 3 , although they need not be the same sizes thereof .
- a three-piece splice (identified generally by the numeral 34) is formed between adjacent ends of two structural reinforcement bars 10a and 10b used in poured reinforced concrete construction.
- Splice 34 is comprised of first reinforcement bar 10a, second reinforcement bar 10b, and coupling sleeve 20.
- first and second reinforcement bars 10a and 10b will preferably have the construction of reinforcement bar 10 described above, where at least one, and preferably both, of such reinforcement bars includes stop members 22a and 22b located immediately adjacent to end segments 16a and 16b for preventing threading of coupling sleeve 20 past such end segment.
- reinforcement bars 10a and 10b are coupled together in an end-to-end manner which meet the standards of the American Concrete Institute 318, Building Code Requeriements for reinforced concrete.
- a setting-splice bar 42 which is used to provide a structural connection between a reinforcement bar 44 and a coupling element 46 as seen in Figs. 4 and 5. More specifically, a linear setting-splice bar 42 has the same general configuration as reinforcement bar 10 described above (see right hand side of Fig. 4) , but it will be understood that it is of substantially shorter length.
- setting-splice bar 42 has an end segment 48 with threads 50 formed therein at one end 43 so that it may be engaged to coupling member 46.
- a stop member 52 is located immediately adjacent to end segment 48 to prevent threading of coupling element 46 past end segment 48.
- the other end 45 of setting-splice bar 42 is then attached to reinforcement bar 44 (which is substantially aligned with a longitudinal axis 58 running through coupling member 46) , such as commonly done by twisting wire therearound.
- a setting-splice bar 54 having a 90 * hook therein is utilized to provide the structural connection for a reinforcement bar 56 with coupling element 46, reinforcement bar 56 being oriented substantially perpendicular to longitudinal axis 58 running through coupling element 46.
- a stop 55 is provided adjacent a threaded end segment 57 of setting- splice bar 54 to prevent coupling element 46 from extending past end segment 57.
- An end 59 opposite threaded end segment 57 of setting-splice bar 54 is attached to reinforcement bar 56, such as by twisting wire therearound.
- Fig. 5 depicts a setting-splice bar 66 having a 180' hook therein so that it may be properly attached to a reinforcement bar 68 oriented substantially parallel to longitudinal axis 58.
- a stop 60 is provided adjacent a threaded end segment 62 of setting-splice bar 66 to prevent coupling element 46 from extending past threaded end segment 62.
- An end 64 opposite threaded end segment 62 of setting- splice bar 66 is attached to reinforcement bar 68, such as by twisting wire therearound.
- a stop member 70 having an annular outer surface 72 may be utilized as depicted in Figs. 6 and 7.
- a knurl such as having a "C"- shape, may also be utilized as an alternate stop member 74, which is depicted in Figs. 8 and 9.
Abstract
A reinforcement bar (10a, 10b) used in poured concrete construction is disclosed which includes a cylindrical body of nominal diameter with raised ribbing extending on the body between two opposite ends. The reinforcement bar has an end segment (16a, 16b) at one of the ends which includes a thread thereon for engaging an internally threaded coupling element (20). A stop member (22a, 22b) is located immediately adjacent to the end segment (16a, 16b) to prevent threading of the coupling element (20) past the end segment. The stop member (22a, 22b) includes an outer surface, such as an annular or hexagonal surface, which is configured to be utilized by a tool. A three-piece splice (34) may be formed between adjacent ends (16a, 16b) of two such reinforcement bars (10a, 10b) and a coupling sleeve (20) open at opposite ends and internally threaded continuously between the ends for mating with the male threads of the first and second reinforcement bar end segments.
Description
COUPLINQ ARRANGEMENTS FOR CONCRETE REINFORCEMENT BARS
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to arrangements for coupling reinforcement bars used in concrete construction, and, more particularly, to reinforcement bars having a threaded end segment for engaging a coupling element and a stop member located immediately adjacent thereto in order to prevent threading of the coupling element past the end segment.
2. Description of Related Art Reinforcement bars, or rebars, have been in widespread use for many years as reinforcing elements in poured or cast concrete structures. In the construction of large structures, where large concrete form work is carried out in steps or stages, it is advantageous to connect or splice together reinforcement bars at each stage in order to achieve a monolithic concrete structure. Accordingly, this may be accomplished by the splicing together of adjacent reinforcement bars either directly (via end-to-end coupling) or indirectly through an intermediate setting-splice bar arrangement.
While many rebar splicing devices and couplers have been devised for the aforementioned purpose, U.S. patent 5,152,118 to Lancelot, discloses a coupling arrangement for concrete reinforcement bars where the rebar includes an upset end with a larger diameter than the rebar body and having threads cut therein for mating engagement with a coupler. In order to allow the coupler to extend past the threaded upset end onto the rebar without affecting any ribbing or deformations of the rebar, the diameter of the upset end and its threading is sized to enable the coupler to clear the ribbing of the rebar. Alternatively, the rebar ribbing immediately
adjacent the threaded upset end is flattened to otherwise enable the coupler to extend past the threaded upset end into the coupler.
Another prior art coupling arrangement is described in the 1992 catalog for Dayton Superior Corporation, which is the assignee of the present invention. Therein, a dowel bar replacement system is disclosed which includes a coupler having a positive stop within its interior to prevent the threaded end of a rebar from entering too far therein and damaging the ribbing on the outside surface of the rebar, as well as insuring proper thread engagement for full connection capacity. It will be noted that the Dayton Superior system discloses a first setting-splice bar which is tied to an existing reinforcement bar in the concrete structure at one end and is then coupled to a second setting-splice bar at the opposite end so as to provide a connection with an adjacent reinforcement bar of a separate stage. With respect to the present invention, a problem of primary concern is prevention of a coupler from engaging the ribbing on a rebar element. As noted in U.S. patent 5,152,118, even a small cut or nick in the ribbing of the rebar produces a "cherpe" effect, by which stress force acting along the rebar is focused or concentrated by relatively minute changes in the geometry of the rebar. Even a shallow thread cut in the ribs has been found to create a plane of weakening in the rebar, and under protracted cyclic loading of the rebar, as may occur for example on a concrete bridge subject to heavy loads moving across it, creates a metal fatigue condition at the site of the surface cut which in turn eventually leads to structural failure of the rebar.
Consequently, two different approaches have been utilized to combat this problem. The first, as disclosed by U.S. patent 5,152,118 is to allow a coupling member to extend past a threaded end over the ribbing of
a rebar without engaging it. The second approach, as described with regard to the Dayton Superior dowel bar replacement system above, is to prevent a rebar from entering a coupling element past a threaded end. It has been found, that while each of these coupling arrangements perform their intended purpose, that certain disadvantages are associated with each. For example, the first mentioned system is utilized with respect to reinforcement bars of somewhat substantial length. This raises the potential for accidents to workers associated with bars extending through the various formwork, and may involve bending and re-bending of such reinforcement bars in order to align appropriately with coupling elements for subsequent stages . Even though the prior Dayton Superior dowel bar replacement system avoids problems associated with rebars of substantial length, it has been found that the placement of a stop in a coupling element is somewhat involved and more costly, and does not allow a useful surface onto which a tool may be engaged for threading the setting-splice bars therein.
Accordingly, it would be desirable for a coupling arrangement to be developed which not only avoids the problems associated with rebars of substantial length, but is also flexible in its application so that standard coupling elements may be utilized. Moreover, it would be advantageous if a coupling arrangement for rebars would include a useable surface onto which tools could be engaged for tightening the rebar to a coupling element.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a coupling arrangement for rebars used in concrete construction which are able to splice together two or more adjacent rebars. Another objective of the present invention is to provide a coupling arrangement for rebars in concrete
construction which splices together two or more rebars without weakening the ribbing on such reinforcement bars.
Still another objective of the present invention is to provide a coupling arrangement for reinforcement bars in concrete construction which includes a useful surface for a tool to tighten the connection between the rebars and a coupler.
Another objective is to provide a coupling arrangement which provides mechanical capacity equivalent to that of the spliced bar.
Yet another objective of the present invention is to provide a coupling arrangement for reinforcement bars used in concrete construction which is flexible for completing the splice between adjacent reinforcement bars without regard to their relative orientation.
Still another objective of the present invention is to provide a coupling arrangement for reinforcement bars in concrete construction which reduces formwork erection and stripping costs. A further objective of the present invention is to provide a coupling arrangmenet which reduces form penetration, and therefore grout leakage and honeycombing, which improves the architectural finish of the concrete. In accordance with one aspect of the present invention, a reinforcement bar used in poured concrete construction is disclosed which includes a cylindrical body of nominal diameter with raised ribbing extending on the body between two opposite ends. The reinforcement bar has an end segment at one of the ends which includes a thread thereon for engaging an internally threaded coupling element. A stop member is located immediately adjacent to the end segment to prevent threading of the coupling element past the end segment. The stop member includes an outer surface, such as annular, square or hexagonal, which is configured to be utilized by a tool. A second aspect of the present invention
involves a three-piece splice between adjacent ends of two reinforcement bars used in poured concrete construction, where the splice includes a first reinforcement bar and a second reinforcement bar, each rebar having a cylindrical body of nominal diameter with raised ribbing extending thereon between two opposite ends. Both the first and second reinforcement bars have an end segment at one of the ends which includes a male thread thereon. A coupling sleeve, open at opposite ends and internally threaded continuously between the ends for mating with the male threads of the first and second reinforcement bar end segments, is also provided. At least one of the first and second reinforcement bars includes a stop member located immediately adjacent to its respective end segment to prevent threading of the coupling sleeve past the respective end segment. The first and second reinforcement bars may each include a second end segment at the other of the respective ends, wherein the second end segment includes a male thread thereon for engaging a separate coupling sleeve. A second stop member located immediately adjacent to the second end segment may be provided to prevent threading of the separate coupling sleeve past the second end segment. A third aspect of the present invention is a setting-splice bar used to provide a structural connection between a reinforcement bar and a coupling element in poured concrete construction. The setting- splice bar includes a cylindrical body of nominal diameter with raised ribbing extending on the body between two opposite ends, the bar having an end segment at one of the ends which includes a thread thereon for engaging the coupling member. A stop member is located immediately adjacent to the end segment to prevent threading of the coupling element past the end segment.
The other end of the bar is attached to the reinforcement bar. In this configuration, a pair of setting-splice
bars may be utilized with a coupling element to provide a structural connection between rebars of adjacent stages.
BRIEF DESCRIPTION OF THE DRAWING While the specification concludes with claims particularly pointing out and distinctly claiming the present invention, it is believed that the same will be better understood from the following description taken in conjunction with the accompanying drawing in which:
Fig. 1 is a partial longitudinal front view of a reinforcement bar in accordance with the present invention;
Fig. 2 is a side view of the reinforcement bar of Fig. 1;
Fig. 3 is a partial longitudinal front view of a three-piece splice of two reinforcement bars like that depicted in Figs. 1 and 2, where the coupling element has been broken away for clarity;
Fig. 4 is a partial longitudinal front view of a pair of setting-splice bars used to indirectly connect adjacent reinforcement bars in separate stages of concrete construction, wherein the left portion depicts a setting-splice bar having a 90* hook therein and the right portion depicts a linear setting-splice bar;
Fig. 5 is a partial longitudinal front view of a pair of setting-splice bars used to indirectly connect adjacent reinforcement bars in separate stages of concrete construction, wherein the left portion depicts a setting-splice bar having a 90* hook therein and the right portion depicts a setting-splice bar having a 180' hook therein;
Fig. 6 is a partial longitudinal front view of a reinforcement bar having a first alternative design;
Fig. 7 is a side view of the reinforcement bar of Fig. 6; Fig. 8 is a partial longitudinal front view of a reinforcement bar having a second alternative design;
and
Fig. 9 is a side view of the reinforcement bar of Fig. 8.
DETAILED DESCRIPTION OF THE INVENTION Referring now to the drawing in detail, wherein identical numerals indicate the same elements throughout the figures, Fig. 1 depicts a reinforcement bar 10 of the type suitable for use in poured concrete construction. Reinforcement bar 10 preferably is fabricated from ASTM- A615 grade 60 reinforcing steel. It will be noted that reinforcement bar 10 has a cylindrical body 12 of nominal diameter d, with raised ribbing 14 extending thereacross between two opposite ends 13 and 15. Reinforcement bar 10 has an end segment 16 at end 13 which includes a thread 18 thereon for engaging an internally threaded coupling element 20 as shown in Fig. 3. Reinforcement bar 10 also includes a stop member 22 located immediately adjacent to end segment 16 to prevent threading of coupling element 20 past end segment 16. Most importantly, stop member 22 prevents coupling element 20 from engaging ribbing 14 in order to prevent any small cuts or nicks therein.
It will be noted that stop member 22 may have any of several sahpes and designs such as circular, elliptical, or square, but as best seen in Fig. 2, is shown as having the design of a hexagonal nut . Accordingly, stop member 22 has a hexagonal outer surface 24 which may be utilized by a wrench or other tool for tightening the connection between reinforcement bar 10 and coupling member 20. Stop member 22 is affixedly positioned on reinforcement bar 10, such as by welding or forging an individual element thereto or cold forming stop member 22 thereon. In any case, it will be understood that stop member 22 will not be moved from its position on reinforcement bar 10 adjacent end segment 16 so that coupling element 20 will be prevented from
extending past end segment 16 and onto ribbing 14.
It will also be seen from Fig. 1 that end segment 16 may have a diameter d; larger than nominal diameter dx of reinforcement bar 10, whereby end segment 16 has what is known as an upset enlarged end. In this way, it is contemplated that thread 18 formed on end segment 16 has a thread diameter d3 at least as great as nominal diameter d, to preserve the tensile strength of reinforcement bar 10. In this regard, it is preferred that thread diameter d3 be intermediate nominal diameter d: and a maximum diameter d4 of reinforcement bar 10 taken across ribbing 14. The preferred relationship of the diameters for reinforcement bar 10 are applicable whether the threads are cut into or rolled on reinforcement bar 10. Regardless of the relative sizes of diameters d1( d2, d3, and d4, it will be understood that stop member 22 will perform its intended purpose so long as the outer diameter d5 of stop member 22 is greater than the inside diameter of coupling element 20 (same as threaded diameter d3) .
It will also be noted from Fig. 1 that reinforcement bar 10 may include a second end segment 26 at end 15, with second end segment 26 also including a thread 28 thereon for engaging a second internally threaded coupling element 30 in a separate stage of the concrete construction. As with first end segment 16, a second stop member 32 is located immediately adjacent to second end segment 26 to prevent the threading of second coupling element 30 past second end segment 26. It will be understood that the relationships between the diameters of second stop member 32 and coupling element 30 will be such as to prevent coupling element 30 from extending past second end segment 26. As noted previously, the relationships between the diameters of second end segment 26, thread 28, and reinforcement bar 10 will be as described above with respect to diameters dlf d2, and d3, although they need not be the same sizes
thereof .
As seen in Fig. 3, a three-piece splice (identified generally by the numeral 34) is formed between adjacent ends of two structural reinforcement bars 10a and 10b used in poured reinforced concrete construction. Splice 34 is comprised of first reinforcement bar 10a, second reinforcement bar 10b, and coupling sleeve 20. It will be understood that first and second reinforcement bars 10a and 10b will preferably have the construction of reinforcement bar 10 described above, where at least one, and preferably both, of such reinforcement bars includes stop members 22a and 22b located immediately adjacent to end segments 16a and 16b for preventing threading of coupling sleeve 20 past such end segment. In this manner, reinforcement bars 10a and 10b are coupled together in an end-to-end manner which meet the standards of the American Concrete Institute 318, Building Code Requuirements for reinforced concrete. Another application of the present invention is with a setting-splice bar 42 which is used to provide a structural connection between a reinforcement bar 44 and a coupling element 46 as seen in Figs. 4 and 5. More specifically, a linear setting-splice bar 42 has the same general configuration as reinforcement bar 10 described above (see right hand side of Fig. 4) , but it will be understood that it is of substantially shorter length. In this system, setting-splice bar 42 has an end segment 48 with threads 50 formed therein at one end 43 so that it may be engaged to coupling member 46. Accordingly, a stop member 52 is located immediately adjacent to end segment 48 to prevent threading of coupling element 46 past end segment 48. The other end 45 of setting-splice bar 42 is then attached to reinforcement bar 44 (which is substantially aligned with a longitudinal axis 58 running through coupling member 46) , such as commonly done by twisting wire therearound.
It will be seen from the left hand portions of
Figs . 4 and 5 that a setting-splice bar 54 having a 90* hook therein is utilized to provide the structural connection for a reinforcement bar 56 with coupling element 46, reinforcement bar 56 being oriented substantially perpendicular to longitudinal axis 58 running through coupling element 46. A stop 55 is provided adjacent a threaded end segment 57 of setting- splice bar 54 to prevent coupling element 46 from extending past end segment 57. An end 59 opposite threaded end segment 57 of setting-splice bar 54 is attached to reinforcement bar 56, such as by twisting wire therearound.
The right hand portion of Fig. 5 depicts a setting-splice bar 66 having a 180' hook therein so that it may be properly attached to a reinforcement bar 68 oriented substantially parallel to longitudinal axis 58. Likewise, a stop 60 is provided adjacent a threaded end segment 62 of setting-splice bar 66 to prevent coupling element 46 from extending past threaded end segment 62. An end 64 opposite threaded end segment 62 of setting- splice bar 66 is attached to reinforcement bar 68, such as by twisting wire therearound.
In each of these configurations, an indirect connection between reinforcement bars 56 and 44 and reinforcement bars 56 and 68 is provided. It should also be noted that the particular setting-splice bars utilized are to provide the appropriate or designated lap splice required for providing the desired structural connection between setting-splice bars 54, 42, and 66 and reinforcement bars 56, 44, and 68, respectively, regardless of their orientation with coupling element 60.
Although the configuration for reinforcement bar 10 and stop member 22 are preferably as shown in Figs. 1 and 2, alternative stop member configurations may be utilized so long as they prevent coupling elements from extending past the threaded end segments of the reinforcement bar. Thus, a stop member 70 having an
annular outer surface 72 may be utilized as depicted in Figs. 6 and 7. Likewise, a knurl, such as having a "C"- shape, may also be utilized as an alternate stop member 74, which is depicted in Figs. 8 and 9. Having shown and described the preferred embodiment of the present invention, further adaptations of the reinforcement bars and couplings therefor may be accomplished by appropriate modifications by one of ordinary skill in the art without departing from the scope of the invention.
Claims
1. A reinforcement bar used in poured concrete construction, comprising:
(a) a cylindrical body of nominal diameter with raised ribbing extending on said body between two opposite ends, said reinforcement bar having an end segment at one of said ends which includes a thread thereon for engaging an internally threaded coupling element; and
(b) a stop member located immediately adjacent to said end segment to prevent threading of said coupling element past said end segment .
2. The reinforcement bar of claim 1, wherein said stop member is a knurl.
3. The reinforcement bar of claim 1, wherein said stop member has an annular outer surface.
4. The reinforcement bar of claim 1, wherein said stop member has a hexagonal outer surface .
5. The reinforcement bar of claim 1, wherein said cylindrical body is linear.
6. The reinforcement bar of claim 1, said end segment having a diameter larger than said nominal diameter, wherein said thread on said end segment has a thread diameter at least as great as said nominal diameter to preserve the tensile strength of said reinforcement bar.
7. The reinforcement bar of claim 6, wherein said thread diameter is intermediate said nominal diameter and a maximum diameter of said ribbing.
8. The reinforcement bar of claim 1, said bar further comprising:
(a) a second end segment at the other of said ends, wherein said second end segment includes a thread thereon for engaging a second internally threaded coupling element; and
(b) a second stop member located immediately adjacent to said second end segment to prevent threading of said second coupling element past said second end segment.
9. A three piece splice between adjacent ends of two structural reinforcement bars used in poured concrete construction, said splice comprising:
(a) a first reinforcement bar having a cylindrical body of nominal diameter with raised ribbing extending thereon between two opposite ends, said first reinforcement bar having an end segment at one of said ends, wherein said end segment includes a male thread thereon;
(b) a second reinforcement bar having a cylindrical body of nominal diameter with raised ribbing extending thereon between two opposite ends, said second reinforcement bar having an end segment at one of said ends, wherein said end segment includes a male thread thereon; and
(c) a coupling sleeve open at opposite ends and internally threaded continuously between said ends for mating with the male threads of said first and second
reinforcement bar end segments; wherein at least one of said first and second reinforcement bars includes a stop member located immediately adjacent to said respective end segment to prevent threading of said coupling sleeve past said respective end segment.
10. The splice of claim 9, wherein said stop member is a knurl .
11. The splice of claim 9, wherein said stop member has an annular outer surface.
12. The splice of claim 9, wherein said stop member has a hexagonal outer surface.
13. The splice of claim 9, said first and second reinforcement bar end segments having a diameter greater than said respective nominal diameters, wherein said thread on said end segments has a thread diameter at least as great as said respective nominal diameters to preserve the tensile strength of said first and second reinforcement bars.
14. The splice of claim 13, wherein said thread diameter of said end segments is intermediate said respective nominal diameters and a maximum diameter of said respective ribbings.
15. The splice of claim 9, said first and second reinforcement bars each further comprising:
(a) a second end segment at the other of said respective ends, wherein said second end segment includes a male thread thereon for engaging a separate coupling sleeve; and
(b) a second stop member located immediately adjacent to said second end segment to prevent threading of said separate coupling sleeve past said second end segment .
16. A bar used to provide a structural connection between a reinforcement bar and a coupling element in poured concrete construction, comprising:
(a) a cylindrical body of nominal diameter with raised ribbing extending on said body between two opposite ends, said bar having an end segment at one of said ends which includes a thread thereon for engaging said coupling member; and (b) a stop member located immediately adjacent to said end segment to prevent threading of said coupling element past said end segment,- wherein the other end of said bar is attached to said reinforcement bar.
17. The bar of claim 16, said cylindrical body being linear to provide a designated lap splice when said reinforcement bar is substantially aligned with an axis through said coupling element.
18. The bar of claim 16, said cylindrical body including a hook therein to provide a designated lap splice when said reinforcement bar is substantially perpendicular to an axis through said coupling element.
19. The bar of claim 16, said cylindrical body including a hook therein to provide a designated lap splice when said reinforcement bar is substantially parallel to an axis through said coupling element.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US52727695A | 1995-09-12 | 1995-09-12 | |
| US08/527,276 | 1995-09-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO1997010391A1 true WO1997010391A1 (en) | 1997-03-20 |
Family
ID=24100821
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1996/007425 WO1997010391A1 (en) | 1995-09-12 | 1996-05-22 | Coupling arrangements for concrete reinforcement bars |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO1997010391A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1012410C2 (en) * | 1999-06-22 | 2001-01-10 | R C M Ankertec B V | Concrete construction with anchor rods and anchor rod. |
| NL1017853C2 (en) * | 2001-04-17 | 2002-10-18 | Barfix Bermuda Ltd | System and method for connecting a reinforcing bar with a coupling piece. |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4143986A (en) * | 1978-01-09 | 1979-03-13 | Antosh Leon A | Rebar splice |
| US4619096A (en) * | 1981-01-15 | 1986-10-28 | Richmond Screw Anchor Co., Inc. | Rebar splicing and anchoring |
| US5152118A (en) * | 1990-08-13 | 1992-10-06 | Richmond Screw Anchor Co., Inc. | Couplings for concrete reinforcement bars |
| US5333976A (en) * | 1993-06-23 | 1994-08-02 | Dobbrunz Kurt A | Center locking spacing bolt |
-
1996
- 1996-05-22 WO PCT/US1996/007425 patent/WO1997010391A1/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4143986A (en) * | 1978-01-09 | 1979-03-13 | Antosh Leon A | Rebar splice |
| US4619096A (en) * | 1981-01-15 | 1986-10-28 | Richmond Screw Anchor Co., Inc. | Rebar splicing and anchoring |
| US5152118A (en) * | 1990-08-13 | 1992-10-06 | Richmond Screw Anchor Co., Inc. | Couplings for concrete reinforcement bars |
| US5333976A (en) * | 1993-06-23 | 1994-08-02 | Dobbrunz Kurt A | Center locking spacing bolt |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1012410C2 (en) * | 1999-06-22 | 2001-01-10 | R C M Ankertec B V | Concrete construction with anchor rods and anchor rod. |
| NL1017853C2 (en) * | 2001-04-17 | 2002-10-18 | Barfix Bermuda Ltd | System and method for connecting a reinforcing bar with a coupling piece. |
| WO2002084041A1 (en) * | 2001-04-17 | 2002-10-24 | Barfix Bermuda Ltd. | System and method for connecting a concrete reinforcing bar to a coupler |
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