CA1203699A - Two part connector for concrete reinforcing bars - Google Patents
Two part connector for concrete reinforcing barsInfo
- Publication number
- CA1203699A CA1203699A CA000431399A CA431399A CA1203699A CA 1203699 A CA1203699 A CA 1203699A CA 000431399 A CA000431399 A CA 000431399A CA 431399 A CA431399 A CA 431399A CA 1203699 A CA1203699 A CA 1203699A
- Authority
- CA
- Canada
- Prior art keywords
- sleeve
- bar
- threads
- reinforcing bars
- concrete reinforcing
- 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
Landscapes
- Reinforcement Elements For Buildings (AREA)
Abstract
CCL SYSTEMS LIMITED
ABSTRACT
A connector or joining two concrete reinforcing bars in end-to-end relation comprises only two parts. Each part is a sleeve having an end portion to be swaged to a bar and an interengaging portion, the intergaging portions being threaded. The connection may be made on site using unskilled labour.
ABSTRACT
A connector or joining two concrete reinforcing bars in end-to-end relation comprises only two parts. Each part is a sleeve having an end portion to be swaged to a bar and an interengaging portion, the intergaging portions being threaded. The connection may be made on site using unskilled labour.
Description
~2Q~6~
TWO PART CONNECTOR FOR
CONCRETE REINFORCING_~ARS
The invention relates to the joining of a pair of concrete reinforcing bars or rods or the like, in end-to-end relation. In particular the inven~ion concerns the joining of the bars in end-to-end relation by means of a two part connector in such a way that the tensile strength of the joint is not less than that of the bars or otherwise satisfies the requirements of a building code or regulation.
One way of joining together two concrete reinforcing bars is by forming a male thread on both bars and a female thread on an i~ntermediate coupler and threading the bars together `in the coupler. Unfortunately the threading reduces the tensile strength of the bar and the cutting of the threads is an extra time consuming and inconvenient step.
It is known to join the bars together by means of swaged sleeves and an intermediate member or stud. These techniques are effective but they do require extra steps and involve the use of an extra element; in some cases it ~ ;~
~2~36~9
TWO PART CONNECTOR FOR
CONCRETE REINFORCING_~ARS
The invention relates to the joining of a pair of concrete reinforcing bars or rods or the like, in end-to-end relation. In particular the inven~ion concerns the joining of the bars in end-to-end relation by means of a two part connector in such a way that the tensile strength of the joint is not less than that of the bars or otherwise satisfies the requirements of a building code or regulation.
One way of joining together two concrete reinforcing bars is by forming a male thread on both bars and a female thread on an i~ntermediate coupler and threading the bars together `in the coupler. Unfortunately the threading reduces the tensile strength of the bar and the cutting of the threads is an extra time consuming and inconvenient step.
It is known to join the bars together by means of swaged sleeves and an intermediate member or stud. These techniques are effective but they do require extra steps and involve the use of an extra element; in some cases it ~ ;~
~2~36~9
2 --is important to ensure that the stud is provided with left and right hand threads.
It is one okject of the invention to provide a means and a method to join two concrete reinforcing bars in end-to-end relation without threading the bars, and which will form a joint having the required properties, e.g~ a tensile strength not less than that of the bars themselves and which involves the use of a two part connector without an intermediate member.
It is another object of this invention to provide a connector and a method of joining reinforcing bars which is quick to assemble on site, is of substantially uniform externaL diameter, requires no mechanical torquing and which can be performed to the predetermined quality at low over-lS all:cost by unskilled operators~
According to one aspe t of the inventio:n there is provided a method of making a connection between two concrete reinforcing bars, which are arranged in end-to-end relation, the method comprising connecting the bars by means of a 2Q connector comprising only two connector portions, each having threads by which the connector portions may be -.~. .
~Z~36~
engaged together, each portion comprising a sleeve which has a through bore and which is engaged to the respective bar by the step of locating a portion o~ the hollow sleeve about the bar and then swaging that portion to the respective contained bar.
The steps of the method may be performed in any sequence;
the threaded parts may be interengaged b~efore both sleeves are swaged on to the bars.
Most preferably the threads are parallel and/or inclined to the major axis of the sleeve, say by about 10 degrees. The threads may be of any suitable shape: threads of V section may be used; in some instances ! e.g. for joining bars of relatively larger diameter, it is preferred to use square threads with sloping faces such as ACME threads. Also the lead of the , .
~ILZ113699 7~91/7495 threads may be greater than the pitch. The lead of the thread may be double, triple or higher; generally a double lead pitch ;s preferred.
It is important to form the two part connector, especially the male part, of a material which can both be swaged and threaded without any decrease of strength. Steel is preferred. It will be appreciated that in forming the male sleeve threaded part to be received in the female sleeve threaded socket one wishes to avoid an increase in the overall diameter of the sleeve assembly. This may involve a reduction in the cross-sectional area of the part of the male sleeve to be threaded. We have found that by reducing the external diameter of the precursor of the sleeve . while holding the other dimensions one can have a threaded male part for a two part connector without losing strength. It is an advantage that the external diameter of the assembled connection is substantiallv uniform.
According to another aspect of the invention there is providea a connection of two concrete reinforcing bars arranged in end-to-end relation, a first sleeve being swaged to one bar and projecting towards t'ne second bar, the sIeeve having a bore with a t:hreaded portion, a second sleeve swaged to the second t)ar ana ~2036~5~
projecting towards the first, the second sleeve having an externally threaded end portion, the externally threaded portion of the second sleeve being hollow and being received in the threaded portion of the first sleeve directly and without the interposition between the sleeves of any third connecting element.
According to another aspect of ~he invention there is provided a two part connector adapted and dimensioned for use in joining together two concrete reinforcing bars, the connector consisting exclusively of two sleeves, each sleeve having one unthreaded end portion for swagin~ onto a bar and another end portion for interengagement with the other sleeve r one of the sleeve engagement parts having a male locating nose, the other sleeve having a female socket for reception of the male extension, the interengaging parts being hollow and threaded~
Preferably t~le concrete reinforcing bars range from about 10 mm to 57 mm in diameter. The bars may be of any type and have any rib deformation and are available under a 2Q variety of names.
Evaluations have shown that the invention is advantageous because skilled operators are not required on site. There is no need to thread the lZ03~i95~
749~/7495 bars, nor for an inspection, or extra protection of the threads: the only job done on site is rotation of one bar with respect to the other.
In order that the invention may be we].l understood it will now be described by way of example with reference to the accompanying diagrammatic drawings in which Figure 1 shows a system for joining two concrete relnforcing bars Bl and B2 together;
Figure 2 is a .sectional elevation of another two bars to be joined: and Figure 3 is a sectional elevation of the formed joint:of Figure 2.
The bars~Bl and B2 of Figure 1 are to be joined by means of two sleeves 51 and S2. The sleeve Sl has a bore 1 wlth an unthreaded portion SlA which has been swaged on to the bar Bl and a threaded portion SlB, which has a screw thread 2 at one end, the rlght, as seen ln Figure 1. The sleeve S2 has a portion S2A
with an unthreaded bore 3 and the left hand end portion S2B has an internal thread 4, shaped and dimensioned to complement the:thread 2 of the sleeve Sl. The sleeve S2 is swaged onto the bar B2 and the thread 4 is then threaded into the threaded bore 2 of .
the sleeve Sl. The assembled connection of the sleeves is of substantially uniform external diameter which is an advantage.
In the embodiment of Figures 2 and 3, two lengths of concrete reinforcing bars Bl, B2 are to be joined by couplers S3, S4. One coupler S3, the male, comprises a length of steel, originally having a straight sidea end portion S3A, which as shown, has been swaged on to the bar Bl, a threaded portion S3B, and a nose 7, the portions transist by an integral neck 5. The threaded portion S3B comprises threads 6 which have a multi-lead, le. a double lead, so that rotation of a nut thereon moves two threads per full rotation. The nose 7 serves for location and alignment into coupler S4.
,, The coupler S4 has an originally straight sided end portion S4A, and a socket end portion S4B which is internally threaded to receive the threaded portion S3B of the male coupler S3. The threads 8 of the socket S4B mate with tnose 6 of the male coupler.
The mouth of the socket S4B has an internal chamfer to initially guide the nose of the male into the socket.
In use, one of the couplers S4, S4 is swaged to a bar Bl, B2. For example, the male coupler S3 may be swaged to the bar Bl in a Eabrication shop. The female coupler is tnen swaged to the bar B2 and ~..;, ~1 ~l20;~6~9 brought to the male coupler or vica versa, and by a few rotations the female is threaded on to the male so joining the bars together. (If the bar B2 is too long to rotate, the coup]ers may be joined ana then the bar B2 may be swaged to the coupler S4). The joint formed meets the appropriate building code requirements. The joint is fast to assemble. It is easy for an operator to see that the couplers are properly joined, since no full threads will be left exposed. The bars may range from U.S. size no. 4 (12 mm) to U.S. size no. 18 (57 mm).
The invention is further illustrated by the following example. Two concrete reinforcing bars of diameter specified in the Table below were joined by appropriately dimensioned connectors according to Figure 2 above. The sleeves were swaged on to the bars and the splice was completed by threaaing the connector parts together to a hand tight connection and then unthreading the connection one half turn to ~simulate the situation where such unthreading may be necessary for example to join misaligned bars. The joint was then continuously tensioned under a load until the joint failed. The tensile strength was determined by dividing the maximum load by the nominal reinforcing bar area. These results show that the joint had a tensile strength exceeaing tne 125% oE the !1 . _ 9 specified bar yield strength of 517 Newtonsimm2 and so the connector would conform for example to the mecnanical splice requirement of the American Concrete Institute standard ACI 318 The tensile strength of the joint is in Newtons/mm and the bar yield strength is Newtons/m ~n ~
.
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It is one okject of the invention to provide a means and a method to join two concrete reinforcing bars in end-to-end relation without threading the bars, and which will form a joint having the required properties, e.g~ a tensile strength not less than that of the bars themselves and which involves the use of a two part connector without an intermediate member.
It is another object of this invention to provide a connector and a method of joining reinforcing bars which is quick to assemble on site, is of substantially uniform externaL diameter, requires no mechanical torquing and which can be performed to the predetermined quality at low over-lS all:cost by unskilled operators~
According to one aspe t of the inventio:n there is provided a method of making a connection between two concrete reinforcing bars, which are arranged in end-to-end relation, the method comprising connecting the bars by means of a 2Q connector comprising only two connector portions, each having threads by which the connector portions may be -.~. .
~Z~36~
engaged together, each portion comprising a sleeve which has a through bore and which is engaged to the respective bar by the step of locating a portion o~ the hollow sleeve about the bar and then swaging that portion to the respective contained bar.
The steps of the method may be performed in any sequence;
the threaded parts may be interengaged b~efore both sleeves are swaged on to the bars.
Most preferably the threads are parallel and/or inclined to the major axis of the sleeve, say by about 10 degrees. The threads may be of any suitable shape: threads of V section may be used; in some instances ! e.g. for joining bars of relatively larger diameter, it is preferred to use square threads with sloping faces such as ACME threads. Also the lead of the , .
~ILZ113699 7~91/7495 threads may be greater than the pitch. The lead of the thread may be double, triple or higher; generally a double lead pitch ;s preferred.
It is important to form the two part connector, especially the male part, of a material which can both be swaged and threaded without any decrease of strength. Steel is preferred. It will be appreciated that in forming the male sleeve threaded part to be received in the female sleeve threaded socket one wishes to avoid an increase in the overall diameter of the sleeve assembly. This may involve a reduction in the cross-sectional area of the part of the male sleeve to be threaded. We have found that by reducing the external diameter of the precursor of the sleeve . while holding the other dimensions one can have a threaded male part for a two part connector without losing strength. It is an advantage that the external diameter of the assembled connection is substantiallv uniform.
According to another aspect of the invention there is providea a connection of two concrete reinforcing bars arranged in end-to-end relation, a first sleeve being swaged to one bar and projecting towards t'ne second bar, the sIeeve having a bore with a t:hreaded portion, a second sleeve swaged to the second t)ar ana ~2036~5~
projecting towards the first, the second sleeve having an externally threaded end portion, the externally threaded portion of the second sleeve being hollow and being received in the threaded portion of the first sleeve directly and without the interposition between the sleeves of any third connecting element.
According to another aspect of ~he invention there is provided a two part connector adapted and dimensioned for use in joining together two concrete reinforcing bars, the connector consisting exclusively of two sleeves, each sleeve having one unthreaded end portion for swagin~ onto a bar and another end portion for interengagement with the other sleeve r one of the sleeve engagement parts having a male locating nose, the other sleeve having a female socket for reception of the male extension, the interengaging parts being hollow and threaded~
Preferably t~le concrete reinforcing bars range from about 10 mm to 57 mm in diameter. The bars may be of any type and have any rib deformation and are available under a 2Q variety of names.
Evaluations have shown that the invention is advantageous because skilled operators are not required on site. There is no need to thread the lZ03~i95~
749~/7495 bars, nor for an inspection, or extra protection of the threads: the only job done on site is rotation of one bar with respect to the other.
In order that the invention may be we].l understood it will now be described by way of example with reference to the accompanying diagrammatic drawings in which Figure 1 shows a system for joining two concrete relnforcing bars Bl and B2 together;
Figure 2 is a .sectional elevation of another two bars to be joined: and Figure 3 is a sectional elevation of the formed joint:of Figure 2.
The bars~Bl and B2 of Figure 1 are to be joined by means of two sleeves 51 and S2. The sleeve Sl has a bore 1 wlth an unthreaded portion SlA which has been swaged on to the bar Bl and a threaded portion SlB, which has a screw thread 2 at one end, the rlght, as seen ln Figure 1. The sleeve S2 has a portion S2A
with an unthreaded bore 3 and the left hand end portion S2B has an internal thread 4, shaped and dimensioned to complement the:thread 2 of the sleeve Sl. The sleeve S2 is swaged onto the bar B2 and the thread 4 is then threaded into the threaded bore 2 of .
the sleeve Sl. The assembled connection of the sleeves is of substantially uniform external diameter which is an advantage.
In the embodiment of Figures 2 and 3, two lengths of concrete reinforcing bars Bl, B2 are to be joined by couplers S3, S4. One coupler S3, the male, comprises a length of steel, originally having a straight sidea end portion S3A, which as shown, has been swaged on to the bar Bl, a threaded portion S3B, and a nose 7, the portions transist by an integral neck 5. The threaded portion S3B comprises threads 6 which have a multi-lead, le. a double lead, so that rotation of a nut thereon moves two threads per full rotation. The nose 7 serves for location and alignment into coupler S4.
,, The coupler S4 has an originally straight sided end portion S4A, and a socket end portion S4B which is internally threaded to receive the threaded portion S3B of the male coupler S3. The threads 8 of the socket S4B mate with tnose 6 of the male coupler.
The mouth of the socket S4B has an internal chamfer to initially guide the nose of the male into the socket.
In use, one of the couplers S4, S4 is swaged to a bar Bl, B2. For example, the male coupler S3 may be swaged to the bar Bl in a Eabrication shop. The female coupler is tnen swaged to the bar B2 and ~..;, ~1 ~l20;~6~9 brought to the male coupler or vica versa, and by a few rotations the female is threaded on to the male so joining the bars together. (If the bar B2 is too long to rotate, the coup]ers may be joined ana then the bar B2 may be swaged to the coupler S4). The joint formed meets the appropriate building code requirements. The joint is fast to assemble. It is easy for an operator to see that the couplers are properly joined, since no full threads will be left exposed. The bars may range from U.S. size no. 4 (12 mm) to U.S. size no. 18 (57 mm).
The invention is further illustrated by the following example. Two concrete reinforcing bars of diameter specified in the Table below were joined by appropriately dimensioned connectors according to Figure 2 above. The sleeves were swaged on to the bars and the splice was completed by threaaing the connector parts together to a hand tight connection and then unthreading the connection one half turn to ~simulate the situation where such unthreading may be necessary for example to join misaligned bars. The joint was then continuously tensioned under a load until the joint failed. The tensile strength was determined by dividing the maximum load by the nominal reinforcing bar area. These results show that the joint had a tensile strength exceeaing tne 125% oE the !1 . _ 9 specified bar yield strength of 517 Newtonsimm2 and so the connector would conform for example to the mecnanical splice requirement of the American Concrete Institute standard ACI 318 The tensile strength of the joint is in Newtons/mm and the bar yield strength is Newtons/m ~n ~
.
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E E E E E
~a ~ o o o o o ~ ~a h h v 4~ ~ ~ ~1 ~ ~ ~ ~ U U U 4 o o o a h ~ ~ h ~ ~ ~ o o Q) a) )~
v~ ~n v~ ~ ~ ~ ~ J~ rD G Q~ n u~
I~ . ~ :
c u~
E~
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Claims (9)
1. A method of making a connection between two concrete reinforcing bars, which are arranged in end-to-end relation, the method comprising connecting the bars by means of a connector comprising only two connector portions, each having threads by which the connector portions may be engaged together, each portion comprising a sleeve which has a through bore and which is engaged to the respective bar by the step of locating a portion of the hollow sleeve about the bar and then swaging that portion to the respective contained bar.
2. A method according to claim 1, in which the threads are parallel and/or inclined to the major axis of the sleeve.
3. A method according to claim 1 or 2, in which the threads are of V slope or square shape with sloping faces.
4. A method according to claim 1 or 2, in which the threads of the sleeve are shaped such that the lead of the threads is greater than the pitch thereof.
5. A method according to claim 1 or 2, in which the threads of the sleeve are shaped such that the lead of the threads is greater than the pitch thereof, and in which the thread has a double lead pitch.
6. A method according to claim 1, in which the diameter of each sleeve is changed along its length such that the external diameter of the assembled connection is substantially uniform.
7. A method according to claim 1 or claim 6, in which the concrete reinforcing bars range from about 10 mm to 57 mm in diameter.
8. A connection of two concrete reinforcing bars arranged in end-to-end relation, a first sleeve being swaged to one bar and projecting towards the second bar, the sleeve having a bore with a threaded portion, a second sleeve swaged to the second bar and projecting towards the first, the second sleeve having an externally threaded end portion, the externally threaded portion of the second sleeve being hollow and being received in the threaded portion of the first sleeve directly and without the interposition between the sleeves of any third connecting element.
9. A two part connector adapted and dimensioned for use in joining together two concrete reinforcing bars, the connector consisting exclusively of two sleeves, each sleeve having one unthreaded end portion for swaging onto a bar and another end portion for interengagement with the other sleeve, one of the sleeve engagement parts having a male locating nose, the other sleeve having a female socket for reception of the male extension, the interengaging parts being hollow and threaded.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB82.18813 | 1982-06-29 | ||
| GB8218813 | 1982-06-29 | ||
| GB82.33658 | 1982-11-25 | ||
| GB08233659A GB2114835B (en) | 1979-05-23 | 1982-11-25 | Temperature detecting device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1203699A true CA1203699A (en) | 1986-04-29 |
Family
ID=26283223
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000431399A Expired CA1203699A (en) | 1982-06-29 | 1983-06-29 | Two part connector for concrete reinforcing bars |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU1631183A (en) |
| BR (1) | BR8303464A (en) |
| CA (1) | CA1203699A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106836653B (en) * | 2017-02-28 | 2023-05-12 | 中国建筑第八工程局有限公司 | Extrusion direct-insertion type steel bar connecting device |
-
1983
- 1983-06-28 BR BR8303464A patent/BR8303464A/en unknown
- 1983-06-28 AU AU16311/83A patent/AU1631183A/en not_active Abandoned
- 1983-06-29 CA CA000431399A patent/CA1203699A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| AU1631183A (en) | 1984-01-05 |
| BR8303464A (en) | 1984-02-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |