GB2127512A - Reinforcing bar coupling system - Google Patents
Reinforcing bar coupling system Download PDFInfo
- Publication number
- GB2127512A GB2127512A GB08324374A GB8324374A GB2127512A GB 2127512 A GB2127512 A GB 2127512A GB 08324374 A GB08324374 A GB 08324374A GB 8324374 A GB8324374 A GB 8324374A GB 2127512 A GB2127512 A GB 2127512A
- Authority
- GB
- United Kingdom
- Prior art keywords
- fitting
- wires
- sleeve
- coupling
- reinforcing bars
- 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.)
- Granted
Links
- 230000003014 reinforcing effect Effects 0.000 title claims abstract description 43
- 238000010168 coupling process Methods 0.000 title claims description 26
- 238000005859 coupling reaction Methods 0.000 title claims description 26
- 230000008878 coupling Effects 0.000 title claims description 25
- 239000000463 material Substances 0.000 claims abstract description 47
- 239000004567 concrete Substances 0.000 claims abstract description 17
- 238000002347 injection Methods 0.000 claims abstract description 10
- 239000007924 injection Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 14
- 239000003822 epoxy resin Substances 0.000 abstract description 2
- 229920000647 polyepoxide Polymers 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 238000005452 bending Methods 0.000 description 4
- 229920005989 resin Polymers 0.000 description 4
- 239000011347 resin Substances 0.000 description 4
- 239000011440 grout Substances 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000013536 elastomeric material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B11/00—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding
- F16B11/006—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing
- F16B11/008—Connecting constructional elements or machine parts by sticking or pressing them together, e.g. cold pressure welding by gluing of tubular elements or rods in coaxial engagement
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B7/00—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections
- F16B7/18—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections using screw-thread elements
- F16B7/182—Connections of rods or tubes, e.g. of non-circular section, mutually, including resilient connections using screw-thread elements for coaxial connections of two rods or tubes
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
Abstract
Reinforcing bars or wire are coupled for structural concrete by applying to adjacent rod or wire portions (1, 2) a material (5) e.g. epoxy resin settable to form a structurally sound joint. The material is applied by injection into a sleeve (6) surrounding the adjacent wire portions. <IMAGE>
Description
SPECIFICATION
Reinforcing bar coupling system
This invention relates to coupling of reinforcing bars and is particularly but not exclusively concerned with end-coupling and fixing reinforcing bars, usually of steel, for use in structural concrete or the like.
Although coupling and fixing methods have
been proposed, usually using steel components, for reinforcing bars in structural concrete, these
methods tend to rely on, for example, threading of
reinforcement bars and tapping the couplers, or swaging techniques. These methods have limited application and, because of the extra working etc.
needed, they tend to be expensive and timeconsuming.
The more traditional method of bending and wiring together of the reinforcing bars means that special personnel have to be used for bending and fixing operations. Furthermore, this method increases the amount of steel needed, especially where ends of bars are bent to achieve parallelism of overlapped bars at the connections, which leads to "bulking" of the steel in columns and beams and problems associated therewith. The design of reinforced concrete structures has to take into acount the bulking of the steel, and, often a particular design of reinforced concrete structure costs more than is necessary to achieve the strength of structure.
The present invention sets out to provide for coupling and fixing of reinforcing bars without end-bending and overlapping of bars in structural concrete or the like which substantially eiiminates bulking of reinforcing bars and which consequently reduces the amount of materials needlessly used in columns, beams and walls and is simpler than prior proposed mechanical methods of coupling and fixing reinforcing bars.
Overall, since the present invention does not rely on bending and wiring together of the reinforcing bars on screwing or swaging techniques, the cost is reduced, together with a reduced reliance on specialist personnel and/or equipment.
According to a first aspect of the invention, there is provided a method of coupling and fixing reinforcing bars or wires for use in structural concrete or the like comprising applying settable sleeving material to adjacent portions, usually involving ends, of reinforcing bars where a junction is required or desired, said sleeving material forming by itself, or in combination with a material-retaining peripheral sleeve fitting useful for injection of the sleeving material, a structurally sound joint between the abutting or confronting end portions of the reinforcing bars.
When in combination with a peripheral sleeve fitting suitable injectable sleeving material may be introduced into the sleeve fitting via any of a plurality of holes, even valved ports, located in the sleeve fitting and also serving as sight holes for checking injection, the sleeve fitting having sealing means at each end portion to prevent loss of sleeving material.
The sleeve fitting may comprise locating means for centring and fixedly locating the adjacent end portions of the reinforcing bars relative to the sleeve. The centring means, which may be at least one combination of a threaded bolt and one of said plurality of holes adapted to receive said threaded bolt, may also serve to assist keying of the sleeving material. Angularly spaced such combinations are preferred.
The sleeve fitting may have other or additional keying means on its surface adjacent the sleeving material i.e. inner surface, which other keying means may also serve as means for centring the adjacent end portions of the reinforcing bars.
The other or additional keying or locating means may comprise stamped or moulded ribs or nibs extending longitudinally or transversely of the surface of the sleeve fitting adjacent the sleeving material. The ribs or nibs may have any desired cross-section, say rectangular or triangular and may taper along their length.
Locating and/or keying means may even comprise a plurality of separable ring or tube-like inserts, or the like, arranged within a said sleeve fitting, the rings or the like each having a diameter smaller than the diameter of the inner surface of the sleeve fitting but greater than the diameter of the reinforcing bars, and permitting one size of sleeve fitting to serve several sizes of reinforcing bar without waste of sleeving material.
The sleeve fitting which is preferably inert relative to the sleeving material may be made of metal or a suitable synthetic polymeric material.
The sleeving material is preferably of a type that cures after application, for example an epoxy-type.
resin material such as "Seltite-Selfix (Registered
Trade Mark) or cementing grout. The sleeving material may additionally comprise entrained fibre-material for additional strength.
In general, it is found that provision of a satisfactorily strong joint is readily achieved using the sleeving material proposals hereof in appropriate thickness for its strength characteristics so as to be of a joint-strength equivalent to the bar-strength. Using the specific epoxy resin materials mentioned herein indicates that a sleeving material thickness of about 5 mm should suffice.
The sleeve fitting may comprise keying means also on its surface adjacent the structural concrete or the like i.e. outer surface. The keying means may serve to provide additional keying between the sleeve fitting and the concrete and may comprise a plurality of longitudinal or transverse ribs or grooves, or a plurality of dots or the like.
The keying means may also comprise the sealing means at each end portion of the sleeve fitting, in fact, naturally occurring steps thereat and the greater diameter and thus surface area of the sleeve fitting itself (compared to the bar) may well be sufficient to give adequate keying to the concrete.
According to a second aspect of the present invention, there is provided a coupling sleeve fitting device for coupling and fixing reinforcing bars in adjacent, usually end-wise, relation for use in structural concrete or the like, which coupling sleeve fitting affords material retention, effectively as a mould, for an injectable sleeving material suitable for jointing adjacent portions of reinforcing bars. Preferably, said sleeving material itself is capable of forming a structurally sound joint between the adjacent portions of the reinforcing bars, though the coupling sleeve fitting could contribute, if desired.
The invention will now be described by way of example with reference to the accompanying drawings, in which:
Figure 1 is a longitudinal section of a joint formed between two reinforcing bars in end-toend alignment and a coupling sleeve fitting of the invention, the section being along the line I-I of
Figure 2;
Figure 2 is a cross-section through the line Il-Il of Figure 1;
Figure 3 is a cross-section through a further embodiment of a coupling sleeve fitting of the invention and one reinforcing bar; and
Figure 4 shows other shapes of coupling.
Figure 1 shows a joint between two adjacent abutting or confronting end portions 1 and 2 of two reinforcing bars 3 and 4 respectively in endto-end alignment. The joint is formed by the combination of a sleeving material 5 and a sleeve fitting 6.
The sleeve fitting 6, which is preferably inert relative to the sleeving material, is made of metal, such as mild steel, or a suitable synthetic polymeric material. The sleeve fitting can be made of various sizes and wall thicknesses, as well as in varying angles, such as 450 or 900 bends, tees, crosses, etc.
A seal or cap is arranged at each end of the sleeve fitting. The seal or cap 7 is shown snap- or push-fitted onto the sleeve fitting and held in place by a pair of spaced flanges 9 defining a circular groove 10. The seal or cap 8 is pierced to enable a reinforcing bar to pass therethrough (as shown in Figure 1). The seal or cap is preferably a grommet made of rubber or a synthetic polymeric or elastomeric material. However, other closures could be used, say of putty-like materials or plasticine.
The sleeve fitting is placed in position around the two reinforcing bars, which can be of any known type, such as ribbed or plain bars. The sleeve fitting has means for centring and fixedly locating the adjacent end portions 1 and 2 of the two reinforcing bars relative to the sleeve. The centring and locating means are a plurality of screws or threaded bolts 11 which engage threaded holes 12 in the sleeve fitting and pass therethrough to abut the reinforcing bars within the sleeve fitting.
The sleeving material 5 is injected into the sleeve fitting through at least one of strategically placed injection or application holes or valved ports 13, which can be the threaded holes 12 used for the centring and locating screws or threaded bolt. The sleeving material is preferably an epoxy-type resin material, such as "Seltite
Selfix" (Registered Trade Mark), or a cementing grout. The sleeving material may additionally comprise an entrained fibre for additional bonding strength.
Any air which is trapped within the sleeve fitting is allowed to escape via bleed holes which in practice are others of the holes or valved ports 1 3. Furthermore, the bleed holes are used to check that the sleeving material has filled completeiy the sleeve fitting.
Once the sleeve fitting has been filled with the sleeving material, the holes or valved ports 13 can be sealed by , for example, rubber or synthetic polymeric or elastomeric material grommets 14 (as shown in Figure 2), though such may not be necessary in practice.
The joint shown in Figures 1 and 2 has the reinforcing bars centred within the sleeve fitting by a pair of screws or threaded bolts 11 engaging a respective end portion 1 or 2 of the reinforcing bars. The pair of screws provides a strong grip and ensures that the sleeve fitting is fixedly located relative to the reinforcing bars.
However, it has been found possible to use one screw or threaded bolt in combination with, for example a pair of spaced ribs or nibs 1 5 (as shown in Figure 3). One screw or threaded bolt permits a quicker release of the sleeve from the reinforcing bars, than if two screws or threaded bolts were present. It is even feasible simply to use three or more ribs or nibs that taper towards ends of the sleeve fitting, though positive grip via screw clamping will normally greatly assist any desired and practical extent of "dry-building" of reinforcing, i.e. prior to concrete pouring.
It is also feasible for such ribs or nibs 1 5 to be on inserts for the sleeve fittings, or even for such inserts to be plain as the inserts would enable one size of sleeve fitting to service different sizes of reinforcing wire without waste of injected material beyond a thickness required to give adequate strength, say 5 mm over the rod/wire radius. The above-mentioned ribs or nibs can have any desired cross-section, and the above mentioned inserts could be spaced rings if desired.
The screws or threaded bolts will, of course, also serve to assist keying between the sleeving material and the inner surface of the sleeve fitting.
It is possible for the exterior surface of the sleeve fitting to have a plurality of longitudinal or transverse ribs or grooves or dots or the like to assist keying between the concrete and the sleeve. However, this may be unnecessary, as the sleeve fitting has a greater surface area for keying than that of the reinforcing bars. Also, steps at the seals or caps 7 assist the keying between the sleeve fitting and the concrete.
The invention has been described with reference to the combination of the sleeving material and the sleeve fitting. It is however possible, actually normal, for the sleeving material considered by itself to provide all required strength of the joint between adjacent end portions of the reinforcing bars. In either of the two above joints, the invention provides a structurally sound joint.
The strength of a joint formed in accordance with the invention is either dependent on the outer sleeve fitting or the inner sleeving material, or just the inner sleeving material. If however, the outer sleeve fitting is strong enough, the joint can be reliably dry built.
The epoxy-type resin material can be used with rusted bars, and the bars do not require coating with a rust converter or the like.
The invention can be used on a single coupling between two reinforcing bars, or on large configurations of reinforcing bars before final fixing with the resin material or cementing grout.
The composition of the sleeving material can be adjusted to vary the setting times, either for flash sets of only a few minutes or slower sets of a few hours.
Figure 4 shows couplings with 450 and 900 bends, in flat-T formation, cross-formation, and corner-T formation. If desired, of course, five or six-branch couplings can be provided. Moreover, where any joint for reinforcing rods/wires where an end of one of the latter meets what could be a continuous run, aligned passages of the coupling could permit it simply to be slid over such a continuous rod or wire.
Claims (10)
1. A method of coupling or fixing reinforcing bars or wires for subsequent embedment in concrete for structural purposes, the method comprising applying to adjacent bar or wire
portions at a desired joint or junction thereof a sleeve of settable material which, when set,
makes a structurally sound joint between and over said adjacent portions, and causing or allowing said material to set to a structually sound state.
2. A method according to claim 1, wherein,
prior to said applying, a material-retaining sleeve fitting is emplaced over said adjacent portions
with a clearance thereto, and said applying is by
injection into said clearance.
3. A method according to claim 2, wherein, after emplacement but before injection, the sleeve fitting is end-capped relative to the wires or rods and injection is then via at least one side aperture in the fitting with air-escape and sight checking of injection at at least another side aperture in the fitting.
4. A methood according to claim 2 or claim 3 wherein, at emplacement, the sleeve fitting is located relative to said bars or wires by adjustment of bolts in threaded bores in side walls of the fitting.
5. A method of coupling or fixing reinforcing bars or wires for structural concrete substantially as herein described with reference to the drawings.
6. A coupling fitting for reinforcing bars or wires for structural concrete in making joints in accordance with the method of any preceding claim, comprising a sleeve-like mould device for settable sleeving material to form the desired joint, said sleeve-like mould device having means for locating it over and about portions of said bars or wires adjacent said desired joint with a clearance to said bar or wire portions; injection access means to said clearance for application of said sleeving material, and air-escape/injection sighting means relative to said clearance.
7. A coupling fitting according to claim 6, wherein the means for locaitng comprises bolts through threaded bores in side walls of the device at radial spacings relative to axes of bars or wires to be jointed.
8. A coupling fitting according to claim 6 or claim 7, having end caps for the fitting relative to encompassed portions of said bars or wires.
9. A coupling fitting according to claim 6, 7 or 8, wherein the fitting is exteriorly formed to aid keying to concrete when the latter is cast thereabout.
10. A coupling fitting for forming joints
between reinforcing bars or rods for structural concrete substantially as herein described and as shown in the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08324374A GB2127512B (en) | 1982-09-11 | 1983-09-12 | Reinforcing bar coupling system |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8225956 | 1982-09-11 | ||
| GB08324374A GB2127512B (en) | 1982-09-11 | 1983-09-12 | Reinforcing bar coupling system |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB8324374D0 GB8324374D0 (en) | 1983-10-12 |
| GB2127512A true GB2127512A (en) | 1984-04-11 |
| GB2127512B GB2127512B (en) | 1986-11-19 |
Family
ID=26283805
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB08324374A Expired GB2127512B (en) | 1982-09-11 | 1983-09-12 | Reinforcing bar coupling system |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2127512B (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2184809A (en) * | 1986-06-25 | 1987-07-01 | Yee Elizabeth W | A splice for overlapping reinforcing bars |
| WO1996000855A1 (en) * | 1994-06-28 | 1996-01-11 | Schlaich Joerg | Bonding of steel sections |
| EP1504163B1 (en) * | 2002-05-01 | 2006-06-14 | Ultimate Design Solutions Ltd. | Coupling device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114961111A (en) * | 2022-03-28 | 2022-08-30 | 柳州城市职业学院 | Corrosion-resistant composite full grouting sleeve and forming process method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1335895A (en) * | 1971-07-21 | 1973-10-31 | Ccl Systems Ltd | Coupling device for the stressing tendons of multi-span post- tensioned concrete structures |
| GB1364212A (en) * | 1972-12-05 | 1974-08-21 | Ccl Systems Ltd | Coupling assembly for the stressing tendons of multi span post tensioned concrete structures |
| GB1462735A (en) * | 1974-05-06 | 1977-01-26 | Michelin & Cie | Pneumatic tyres |
| GB1478705A (en) * | 1974-09-13 | 1977-07-06 | Furukawa Electric Co Ltd | Connector for fibre reinforced plastics filaments or cord |
| GB1493005A (en) * | 1974-04-24 | 1977-11-23 | Zueblin Ag | Reinforcing element provided with an anchoring member |
| GB1546253A (en) * | 1977-12-19 | 1979-05-23 | British Steel Corp | Reinforcing bar joints |
-
1983
- 1983-09-12 GB GB08324374A patent/GB2127512B/en not_active Expired
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1335895A (en) * | 1971-07-21 | 1973-10-31 | Ccl Systems Ltd | Coupling device for the stressing tendons of multi-span post- tensioned concrete structures |
| GB1364212A (en) * | 1972-12-05 | 1974-08-21 | Ccl Systems Ltd | Coupling assembly for the stressing tendons of multi span post tensioned concrete structures |
| GB1493005A (en) * | 1974-04-24 | 1977-11-23 | Zueblin Ag | Reinforcing element provided with an anchoring member |
| GB1462735A (en) * | 1974-05-06 | 1977-01-26 | Michelin & Cie | Pneumatic tyres |
| GB1478705A (en) * | 1974-09-13 | 1977-07-06 | Furukawa Electric Co Ltd | Connector for fibre reinforced plastics filaments or cord |
| GB1546253A (en) * | 1977-12-19 | 1979-05-23 | British Steel Corp | Reinforcing bar joints |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2184809A (en) * | 1986-06-25 | 1987-07-01 | Yee Elizabeth W | A splice for overlapping reinforcing bars |
| WO1996000855A1 (en) * | 1994-06-28 | 1996-01-11 | Schlaich Joerg | Bonding of steel sections |
| EP1504163B1 (en) * | 2002-05-01 | 2006-06-14 | Ultimate Design Solutions Ltd. | Coupling device |
| US7093402B2 (en) | 2002-05-01 | 2006-08-22 | Ultimate Design Solutions Ltd. | Coupling device |
| US7107735B2 (en) | 2002-05-01 | 2006-09-19 | Ultimate Design Solutions Ltd. | Coupling device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB8324374D0 (en) | 1983-10-12 |
| GB2127512B (en) | 1986-11-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| PE20 | Patent expired after termination of 20 years |