GB2272114A - Tacking tensile load at cable joints - Google Patents
Tacking tensile load at cable joints Download PDFInfo
- Publication number
- GB2272114A GB2272114A GB9222504A GB9222504A GB2272114A GB 2272114 A GB2272114 A GB 2272114A GB 9222504 A GB9222504 A GB 9222504A GB 9222504 A GB9222504 A GB 9222504A GB 2272114 A GB2272114 A GB 2272114A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cable
- stopper
- tensile load
- joint
- housing
- 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.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 claims abstract description 14
- 229910000831 Steel Inorganic materials 0.000 description 5
- 239000010959 steel Substances 0.000 description 5
- 239000004020 conductor Substances 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/08—Cable junctions
- H02G15/10—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes
- H02G15/12—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes for incorporating transformers, loading coils or amplifiers
- H02G15/14—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes for incorporating transformers, loading coils or amplifiers specially adapted for submarine cables
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4439—Auxiliary devices
- G02B6/4471—Terminating devices ; Cable clamps
- G02B6/4477—Terminating devices ; Cable clamps with means for strain-relieving to interior strengths element
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4439—Auxiliary devices
- G02B6/4471—Terminating devices ; Cable clamps
- G02B6/44785—Cable clamps
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G15/00—Cable fittings
- H02G15/007—Devices for relieving mechanical stress
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Cable Accessories (AREA)
Abstract
A method of jointing two ends of a cable containing internal mechanical strength members within an external sheath comprises the steps of affixing to each cable an external "stopper" (12a, 12b, 24a, 24b) extending from a short distance from the end of the cable (10) away from the cable end, providing mechanical tensile load transfer means (12, 30a, 30b) between the two stoppers (12a, 12b, 24a, 24b), preparing an end portion of each cable to expose a length of the cable core (10a, 10b) and performing a jointing procedure between the exposed cable core ends whereby the jointed ends of the cable core are free of tensile load. <IMAGE>
Description
Cable Joint
This invention relates to cable joints in cables containing internal mechanical strength members and to methods of making such joints, with particular but not exclusive reference to optical fibre submarine telecommunications cables.
Hitherto jointing of armoured submarine cables, e.g. for repair purposes, has involved stripping back the ends of the cable to be joined to expose a short length of the steel wire armouring, splaying the armour wires and anchoring the splayed ends in special collars fabricated in the ends of a rigid steel housing within which the conductor or fibre joints are effected. The housing is then overmoulded with a polymer to prevent water ingress. Tensile stress between the two joined parts of the cable is transferred from the steel wire armouring of the one part via the rigid housing to the steel wire armouring of the other part. Making such a joint is time consuming and awkward in as much as it involves manipulating the ends of the steel armour wires. It is also expensive in that it requires fabrication of the housing with its special wire clamping means at each end.
It is already known to utilise so-called preformed wire "stoppers11 to haul cables longitudinally. These stoppers are helically stranded wires and are applied over the external sheath of the cable for a short distance to grip the sheath so that tensile load is gradually transferred over this distance from the internal cable elements to the external preform stoppers. The stopper is usually formed with some kind of "eye" joint beyond the cable end so that it can be attached to a towing hook or the like for hauling the cable.
According to the present invention there is provided a method of jointing two ends of a cable containing internal mechanical strength members within an external sheath, the method comprising the steps of affixing to each cable an external "stopper" means extending from a short distance from the cable end away from the cable end, providing mechanical tensile load transfer means between the two stopper means, preparing an end portion of each cable to expose a length of the cable core and performing a jointing procedure between the exposed cable core ends whereby the jointed ends of the cable core are free of tensile load.
In a preferred embodiment the two stopper means are comprised by opposite ends of a double ended common stopper, wherein they are spaced apart by a central portion of the common stopper, and the cable ends are caused to emerge from the bore of the stopper whereby the cable core joint is formed externally of the stopper.
In an alternative embodiment the two cable ends are engaged in separate stoppers which are separately engaged in respective ends of a rigid housing to provide tensile load transfer, the cable core joint being formed within the housing.
Embodiments of the invention will now be described with reference to the accompanying drawings, in which Fig. 1 illustrates a cable joint using a double-ended wire
stopper;
Figs. 2 and 3 illustrate details of the joint of Fig. 1;
Figs. 4 and 5 illustrate a cable joint using two separate
wire stoppers and an intermediate rigid housing.
In the cable joint shown in Figs. 1-3 the two ends lOa, lOb of the cable to be joined are first inserted into respective ends 12a, 12b of a comparatively long double ended preformed wire stopper 12.
The stopper 12 is fabricated with two spaced apart collars 14a, 14b having openings 16a, 16b through which the ends lOa, lOb emerge.
The ends of the cable are then stripped in conventional fashion to expose the conductors or optical fibres 18a, 18b for jointing in conventional manner, after which the joint 1 8c is sealed in a cast resin body 20 or other protective body. In the finished joint tensile loading is transferred from the external sheath of one cable to the other via the stopper 12 while the cable core joint is effected on untensioned end lengths lOa, lOb of the cable. This provides an inexpensive joint which is easy to make and does not require a large rigid joint housing. The finished joint has a slim profile which can readily pass through a cable engine while the untensioned portion can be lifted away to one side until the stopper exists the cable engine.
In the embodiment shown in Figs. 4 and 5 the two cable ends 22a, 22b are fed through separate cable stoppers 24a, 24b. The cable ends are then stripped to make the cable core joint 26. Each stopper 22a, 22b has a respective collar 28a, 28b welded to its end directed toward the other stopper. The two collars 28a, 28b are shaped to engage the ends of a rigid joint housing 30, which may be in fact two halves 30a, 30b of a split housing which is filled with a sealing compound. The rigid housing also serves to transfer tensile load from one stopper to the other. In practice the rigid housing can be fabricated in one of two forms. In the first form it comprises a split cylindrical housing, i.e. two half-shells that are clamped together to engage flanges or grooves (not shown) on the collars 28a, 28b. In an alternative construction the ends of the two half shells are secured to the collars by radial bolts extending through the half shell into the collar, whereby the tensile load is transferred from the collars to the half shells through the bolts which are in shear stress.
Claims (8)
1. A method of jointing two ends of a cable containing internal mechanical strength members within an external sheath, the method comprising the steps of affixing to each cable an external "stopper" means extending from a short distance from the cable end away from the cable end, providing mechanical tensile load transfer means between the two stopper means, preparing an end portion of each cable to expose a length of the cable core and performing a jointing procedure between the exposed cable core ends whereby the jointed ends of the cable core are free of tensile load.
2. A method according to claim 1 wherein the two stopper means are comprised by opposite ends of a double ended common stopper, wherein they are spaced apart by a central portion of the common stopper, and the cable ends are caused to emerge from the bore of the stopper whereby the cable core joint is formed externally of the stopper.
3. A method according to claim 1 wherein the two cable ends are engaged in separate stoppers which are separately engaged in respective ends of a rigid housing to provide tensile load transfer, the cable core joint being formed within the housing.
4. A method according to claim 3 wherein the housing is comprised of two half cylindrical shells which are clamped together to engage by way of flanges with collars affixed to the stoppers.
5. A method according to claim 3 wherein the housing is comprised of two half cylindrical shells which are assembled to two collars affixed to the stoppers by radially spaced bolts extending through the half shells into the collars.
6. A method substantially as described with reference to the accompanying drawings.
7. A cable joint for two ends of a cable containing internal mechanical strength members within an external sheath, the joint comprising external "stopper" means extending from a short distance from the cable end away from the cable end, mechanical tensile load transfer means between the two stopper means, whereby the ends of the cable are free of tensile load, the end portions of each cable being jointed together to form a tensile load free joint.
8. A cable joint substantially as described with reference to the accompanying drawings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9222504A GB2272114A (en) | 1992-10-27 | 1992-10-27 | Tacking tensile load at cable joints |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9222504A GB2272114A (en) | 1992-10-27 | 1992-10-27 | Tacking tensile load at cable joints |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9222504D0 GB9222504D0 (en) | 1992-12-09 |
| GB2272114A true GB2272114A (en) | 1994-05-04 |
Family
ID=10724088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9222504A Withdrawn GB2272114A (en) | 1992-10-27 | 1992-10-27 | Tacking tensile load at cable joints |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2272114A (en) |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1420503A (en) * | 1972-05-08 | 1976-01-07 | Preformed Line Products Co | Conductor breakout |
| GB1566214A (en) * | 1976-11-25 | 1980-04-30 | Cselt Centro Studi Lab Telecom | Method of joining optical cables |
| US4484962A (en) * | 1984-01-17 | 1984-11-27 | Thomas & Betts Corporation | Method and apparatus for applying strain relief to a cable splice |
| GB2157097A (en) * | 1984-04-02 | 1985-10-16 | Exxon Production Research Co | Cable connector for downhole drilling and logging operations |
| US4601536A (en) * | 1982-03-17 | 1986-07-22 | Les Cables De Lyon | Connection for a submerged optical fiber cable |
| US4664471A (en) * | 1983-09-16 | 1987-05-12 | Les Cables De Lyon | Junction box for joining the ends of underwater optical fiber cables by welding |
| EP0350245A2 (en) * | 1988-07-04 | 1990-01-10 | BICC Public Limited Company | Connecting device for use with optical fibres |
-
1992
- 1992-10-27 GB GB9222504A patent/GB2272114A/en not_active Withdrawn
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1420503A (en) * | 1972-05-08 | 1976-01-07 | Preformed Line Products Co | Conductor breakout |
| GB1566214A (en) * | 1976-11-25 | 1980-04-30 | Cselt Centro Studi Lab Telecom | Method of joining optical cables |
| US4601536A (en) * | 1982-03-17 | 1986-07-22 | Les Cables De Lyon | Connection for a submerged optical fiber cable |
| US4664471A (en) * | 1983-09-16 | 1987-05-12 | Les Cables De Lyon | Junction box for joining the ends of underwater optical fiber cables by welding |
| US4484962A (en) * | 1984-01-17 | 1984-11-27 | Thomas & Betts Corporation | Method and apparatus for applying strain relief to a cable splice |
| GB2157097A (en) * | 1984-04-02 | 1985-10-16 | Exxon Production Research Co | Cable connector for downhole drilling and logging operations |
| EP0350245A2 (en) * | 1988-07-04 | 1990-01-10 | BICC Public Limited Company | Connecting device for use with optical fibres |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9222504D0 (en) | 1992-12-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 732E | Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977) | ||
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |