JP2020003538A - Cable and method for removing the same - Google Patents

Abstract

To improve work efficiency for removing a specific cable and to shorten working time.SOLUTION: A cable 100 is constituted by a hollow tubular outer shell 105 formed of an insulation material and having a transparent outer shell 107 formed of a material having translucency at least in a part thereof, a linear conductor 102 provided at an inner side of the outer shell, and a light guide member 108 provided at an inner side of the outer shell between the conductor and the inner surface of the outer shell. Thereby, by entering visible light from an end of the cable to be removed to make the cable emit light, the cable to be removed can be specified easily and reliably irrespective of a cable length.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cable that conducts electricity or light and a method for removing the cable.

  Various cables, such as energized electric wires and non-energized lines such as optical fiber cables, are laid in a space for accommodating electric wires. Conventionally, when removing a cable from such a space, check the sign displayed on the cable or check the cable as it is being traced from the end of the cable by checking the cable to be removed. I was checking.

  As a related technique, specifically, conventionally, for example, a first terminal connection member is attached to one of connectors provided at both ends of a cable, and a second terminal having a light emitting portion is provided to the other connector. In the state where the terminal connection member is attached, the control light is emitted from the light emitting portion to the outside of the second terminal connection member, and the corresponding first terminal connection member is caused to emit light. There has been a technique related to a cable identification system and a cable identification method for identifying a target cable from the Japanese Patent Application Laid-Open No. H10-157, for example.

  Also, specifically, conventionally, for example, light is input from a first connector attached to one end of a LAN cable having a light transmission line disposed substantially at the center of a radial cross section, and attached to the other end of the LAN cable. There is a technology related to a LAN cable, an end tracking device, a LAN cable forming method, and an end tracking method in which a light transmitting member emits light inside the second connector (for example, see Patent Document 2 below). .

JP-A-2017-117718 JP 2010-32962 A

  However, in each of the above-described conventional technologies, the light (visible light) incident from one end of the cable to be specified is identified at the other end of the cable, so that both ends or the other end of the cable to be specified. Therefore, there is a problem that the cable to be specified cannot be specified by visually observing the middle of the cable.

  In addition, in each of the above-described conventional technologies, the light (visible light) incident from one end of the cable to be specified is identified at the other end of the cable, so that the end of the cable to be specified is specified. However, when specifying multiple cables in a bundle or cables located in the shadow of other cables, it is difficult to remove them simply by specifying both ends of the cables. was there.

  SUMMARY OF THE INVENTION The present invention provides a cable and a cable removing method capable of improving the working efficiency of the task of removing a specific cable and shortening the working time in order to solve the above-mentioned problems caused by the conventional technology. The purpose is to:

  In order to solve the above-described problems and achieve the object, a cable according to the present invention is a hollow tubular outer sheath having a transparent outer sheath formed of an insulating material and formed at least in part of a translucent material. And a linear conductor provided inside the outer cover, and a light guide member provided inside the outer cover and between the conductor and the inner surface of the outer cover. And

  The cable according to the present invention is characterized in that, in the above-described invention, a plurality of the transparent skin portions are provided intermittently along a length direction of the skin.

  Further, the cable according to the present invention is characterized in that, in the above invention, the transparent sheath portion has a ring shape centered on the axis of the sheath.

  Further, the cable according to the present invention is characterized in that, in the above invention, a plurality of the transparent skin portions are provided on the same circumference centered on the axis of the skin.

  In the cable according to the present invention, in the above invention, the conductor is a conducting wire that conducts electricity.

  In the cable according to the present invention, in the above invention, the conductor is an optical fiber through which light passes.

The method for removing a cable according to the present invention is such that visible light is incident from one end of the cable, the cable that guides the visible light is specified, and the specified cable is removed.
It is characterized by the following.

  ADVANTAGE OF THE INVENTION According to the cable and the cable removal method concerning this invention, there exists an effect that the working efficiency concerning the operation | work which removes a specific cable can be improved, and the working time can be shortened.

FIG. 1 is an explanatory diagram illustrating a configuration of a cable according to a first embodiment of the present invention. FIG. 9 is an explanatory diagram illustrating a configuration of a cable according to a second embodiment of the present invention. FIG. 10 is an explanatory diagram illustrating a configuration of a cable according to a third embodiment of the present invention.

  Hereinafter, preferred embodiments of a cable and a cable removing method according to the present invention will be described in detail with reference to the accompanying drawings.

<Embodiment 1>
(Cable configuration)
First, the configuration of the cable according to the first embodiment of the present invention will be described. FIG. 1 is an explanatory diagram illustrating a configuration of a cable according to a first embodiment of the present invention. In FIG. 1, a cable 100 according to a first embodiment of the present invention has a linear appearance. The cable 100 according to the present invention may be a power cable or a communication cable. FIG. 1 illustrates a communication cable 100 as an example.

  The cable 100 according to the first embodiment of the present invention includes a tension member 101, a core wire 102, a protective layer 103, a holding member 104, and an outer sheath (sheath) 105. The tension member 101 is a linear body, and bears a tension and a temperature expansion / contraction force applied to the cable 100 at the time of manufacturing, laying, and laying the cable 100.

  The tension member 101 is provided to prevent the core wire 102 from being bent or stretched more than necessary. The tension member 101 protects the core wire 102 from an external force applied to the cable 100 and strains the optical fiber. The stress is not applied. The tension member 101 is formed of, for example, steel wire, FRP, aramid fiber, or the like.

  A plurality of cords 102 are provided, each of which is arranged around the tension member 101. Each of the core wires 102 includes a thin wire core and a clad that covers the outer peripheral surface of the core (not shown), and the light incident from one end in the length direction is applied to the other end. Propagate to In the first embodiment, the core wire 102 implements the conductor according to the present invention. The conductor according to the present invention may be realized by a conducting wire that conducts electricity. In this case, the cable 100 functions as a power cable.

  The core mainly realizes a function of propagating light incident from one end in the length direction to the other end. Specifically, the core can be formed using a material having a high light refractive index, such as silica glass (quartz glass), for example. Ge (germanium) or P (phosphorus) may be added to the core to increase the refractive index.

  The clad realizes a function of reflecting light propagating in the core into the core at an interface with the core. The clad is formed using a material having a lower refractive index of light than the core. Specifically, the clad can be realized by, for example, silica glass whose refractive index is reduced by adding B (boron) or F (fluorine).

  In the cable 100, as the core wire 102, for example, a tape core wire in which a plurality of core wires 102 arranged in parallel are collectively covered with an ultraviolet curable resin or the like can be used. The tape core wire is widely used because a plurality of core wires 102 can be fusion-spliced together and the connection work time can be reduced.

  In a cable 100 using a tape core, a tape slot 106 that holds a plurality of tape cores 102 that are superimposed is arranged around the tension member 101. By using a tape core, a high-density cable 100 with a small diameter can be realized.

  In the cable 100, the core wire 102 is not limited to the tape core wire, but may be a single core wire. In this case, a plurality of single core wires are arranged around the tension member 101. Further, the cable 100 may be a unit-type cable including a plurality of units constituted by a plurality of cords 102 and arranging the plurality of units around the tension member 101.

  The protective layer 103 is provided around the core wire 102 so as to surround the core wire 102 (tape slot 106). The protective layer 103 is formed using a material having elasticity, and protects the cord 102 provided around the tension member 101 from external force. The protective layer 103 can be formed, for example, of a foamable resin. The presser winding member 104 wraps the protective layer 103 from the outer peripheral side and presses and fixes the protective layer 103 around the tension member 101 in a state of wrapping the core wire 102.

  The outer shell 105 has a hollow tubular shape and is formed of an insulating material. The outer cover 105 covers the presser winding member 104 from the outer peripheral side, and protects the laid cable 100 from the laid environment. The outer skin 105 can be formed using, for example, PE (polyethylene), PVC (polyvinyl chloride), FEP, or the like.

  FEP, which is a copolymer of tetrafluoroethylene and hexafluoropropylene, is excellent in heat resistance, weather resistance and mechanical strength, but it is expensive, so that the material for forming the sheath is not suitable in terms of performance and price. Therefore, it is preferable to use PE or PVC. In addition, since PVC generates toxic chlorine-based gas and dioxin during combustion, it is preferable to use a sheath formed of PE.

  PE is excellent in corrosion resistance and impact resistance, but has the property of being easily degraded by ultraviolet rays alone. For this reason, in the PE forming the sheath, a black pigment such as carbon black is added, and the black pigment absorbs ultraviolet rays to improve the weather resistance and extend the life in many cases. Further, by adding a black pigment to the PE forming the sheath, transmission of external light into the cable 100 can be suppressed, and deterioration of members provided inside the sheath such as the core wire 102 can be suppressed. .

  The outer skin 105 includes a transparent outer skin portion 107 formed at least in part of a light-transmitting material. Each transparent sheath 107 has an annular shape centered on the axis of the cable 100. A plurality of transparent skin portions 107 are provided intermittently along the length direction of the skin 105, that is, the cable 100. Specifically, a plurality of the transparent cover portions 107 are provided at arbitrary intervals from each other in the length direction of the cable 100, for example, "2 meter intervals", "3 meter intervals", and the like.

  The transparent cover 107 can be formed using an optically transparent material such as transparent vinyl, for example. Further, the transparent skin 107 may be formed of, for example, transparent PE in which a black pigment is not mixed. Thereby, the corrosion resistance and impact resistance of the transparent outer cover 107 can be ensured.

  Also, instead of making the entire cable 100 transparent, a transparent sheath portion 107 is provided on a part of the outer sheath 105, and the other portion is colored with a black pigment or the like, so that a core wire provided inside the outer sheath 105 is provided. Deterioration of members provided inside the sheath such as 102 can be suppressed, and weather resistance and long life of the cable 100 can be secured.

  The cable 100 further includes a light guide member 108. The light guide member 108 is formed using an optically transparent material, has a linear shape, and transmits light incident from one end in the length direction to the other end. The light guide member 108 can be realized by, for example, an optical fiber similar to the above-described core wire 102.

  The light guide member 108 is provided inside the outer skin 105 and between the core wire 102 as a conductor and the inner surface of the outer skin 105. The light guide member 108 is provided directly below the outer skin 105. The light guide member 108 may be in contact with the inner peripheral surface of the outer skin 105, or may be opposed to the space 105 with a space. More specifically, in the cable 100 of the first embodiment, the light guide member 108 is provided between the presser winding member 104 that winds the core wire 102 and the protective layer 103 from the outer peripheral side and the inner surface of the outer sheath 105. Have been.

  Further, it is preferable that a plurality of light guide members 108 are provided on the same circumference around the axis of the cable 100. When a plurality of light guide members 108 are provided on the same circumference around the axis of the cable 100, the light guide members 108 are preferably provided at equal intervals on the same circumference.

  As described above, the outer cover 105 includes the transparent outer cover 107, and the light guide member 108 is provided immediately below the outer cover 105. Therefore, at the position where the transparent outer cover 107 is provided, the transparent outer cover 107 is provided. The light guide member 108 is located immediately below the light guide member 108. Further, since a plurality of the transparent skin portions 107 are provided intermittently along the length direction of the cable 100, the plurality of transparent skin portions 107 are provided at the plurality of locations in the length direction of the cable 100 from outside the cable 100 via the transparent skin portion 107. Light emission of the light guide member 108 can be visually recognized.

  Each of the plurality of transparent skin portions 107 provided intermittently along the length direction of the cable 100 has a ring shape centered on the axis of the skin 105. Thus, during the manufacture of the cable 100, the light guide member 108 can be reliably disposed immediately below each transparent cover 107 without strictly adjusting the positional relationship between the transparent cover 107 and the light guide member 108. it can. Thus, the light emission of the light guide member 108 can be reliably visually recognized from the outside of the cable 100 via each transparent sheath 107.

(Example of conventional cable removal work)
Next, an example of a removing operation for removing a specific cable 100 from a plurality of conventional cables laid in multiple strips will be described. In such a conventional cable removal operation, first, the end of the cable to be removed is specified. The end of the cable to be removed can be specified by the position of the connected end.

  Specifically, the end of the cable to be removed is, for example, a device such as an optical connection box to which the end of the cable to be removed is connected, or the cable to be removed in the device is connected. It can be specified by specifying (identifying) the position of the connector.

  Conventionally, the cable to be removed is specified by tracing the cable from the specified end to the opposite end. When a cable such as a tape is provided with a sign on the cable to be removed, the corresponding cable is traced on the basis of the sign to specify the entire cable to be removed. If the cable to be removed is provided with a sign such as a tape, the cable can be cut and removed in the middle section of the cable.

  However, if the cable to be removed is long, if the cable to be removed is laid over multiple floors (floors), or if the cable to be removed is laid behind another cable In this case, even if the end of the cable to be removed is specified, it is difficult to immediately specify the entirety of the cable to be removed.

  In such a case, conventionally, for example, one worker has to pull the end of the cable to be removed, and another worker has to visually follow the cable that moves with it. For this reason, a plurality of operators are required to specify the entire cable, which requires a great deal of labor and a long time, which is troublesome.

  In particular, conventionally, when the cable to be removed is an old cable, the cable to be removed is pulled from the end because the cable laid later is laid so as to overlap the cable. However, the cable is difficult to move, and it is troublesome and time-consuming to specify the entire cable to be removed. On the other hand, by using the cable 100 according to the first embodiment of the present invention, the entire cable 100 to be removed can be easily and quickly specified by the following method.

(Example of cable 100 removal work)
Next, an example of a removing operation for removing the cable 100 to be removed in an environment where a plurality of cables 100 according to the first embodiment of the present invention are laid will be described. When removing the cable 100, first, the end of the cable 100 to be removed is specified in the same manner as described above, and visible light is incident from the specified end. The visible light can be incident using, for example, a visible light incident device described below.

  Such a visible light incidence device can be realized, for example, by a configuration similar to a known optical fiber checker used for checking the continuity of an optical fiber. Specifically, the visible light incidence device includes an optical connector, a light source, a switch, a control circuit, and a power supply.

  The optical connector can be composed of a ferrule and a holder. The optical connector is detachably attached to the light guide member 108 included in the cable 100 to be removed. It is preferable that the visible light incidence device includes connectors equal in number or more to the number of light guide members 108 included in the cable 100 to be removed. The description of the optical connector is omitted because it can be easily realized by using a known technique.

  The light source emits visible light having a wavelength (about 380 to 780 nm) that can be seen by human eyes. Specifically, the light source can be realized, for example, by a laser light source that emits laser light having a wavelength in the visible light range. The light source emits light at a wavelength with good visibility such as red.

  The switch receives an operation performed by the operator to switch on / off the light source. The control circuit switches on / off of the light source according to the operation received by the switch. As the power source, for example, a battery can be used. The visible light incidence device may be connected to an outlet via an AC / DC converter instead of the power supply.

  The visible light incidence device may include a cap-shaped connector having an inside diameter that can cover the end of the cable 100 to be removed, instead of the connector. In this case, a light emitter for emitting light at least on the entire bottom surface in the cap shape is provided inside the connector. Specifically, a diffusion plate is provided on the entire bottom surface of the connector in the form of a cap, and a light source for emitting light to the diffusion plate is provided.

  By using the visible light incident device provided with such a connector having a cap shape, regardless of the number of light guide members 108 provided in the cable 100, just covering the end of the cable 100 with the connector having the cap shape, Visible light can be easily and reliably incident on all the light guide members 108.

  The visible light incident from the end of the cable 100 to be removed is guided through the light guide member 108 of the cable 100 to be removed. Thus, the light guide member 108 of the cable 100 to be removed emits visible light such as red, for example. Since the light guide member 108 is positioned immediately below the transparent sheath 107, light emitted from the light guide member 108 is diffused to the outside of the cable 100 via the transparent sheath 107. Further, since a plurality of the transparent skin portions 107 are provided intermittently along the length direction of the cable 100, the light-guiding members 108 that emit light are provided at a plurality of locations in the length direction of the cable 100. Can be visually recognized via.

  In particular, when the transparent outer cover 107 has a ring shape centered on the axis of the outer cover 105, the light guide member 108 and the transparent outer cover 107 always overlap in the radial direction of the cable 100. On the other hand, the light emission of the light guide member 108 can be surely visually recognized. In the case of the cable 100 including a plurality of light guide members 108, the number of the light guide members 108 in which light emission can be visually recognized through the transparent cover 107 increases in each transparent cover 107. Regardless, the light emission of the light guide member 108 can be more visually recognized.

  Thereby, when the cable 100 to be removed is long, when the cable 100 to be removed is laid over a plurality of floors (floor floors), or when the cable 100 to be removed is shaded by another cable 100, Even when the cable 100 is laid, the operator can easily and reliably specify the entire cable 100 simply by inputting visible light from one end of the cable 100 to be removed. Thus, the specific cable 100 to be removed can be accurately and quickly removed without being mistaken.

  In addition, by fixing the visible light incident device attached to the cable 100 to be removed while emitting visible light, the worker can specify the cable 100 to be removed alone. Furthermore, one worker can perform a series of operations from identification of the cable 100 to be removed to removal of the cable 100. Thereby, the work efficiency can be improved.

  As described above, according to the cable 100 of the first embodiment according to the present invention, it is possible to eliminate the occurrence of an accident and the re-operation of the cable 100 due to erroneous recognition of the cable 100 to be removed. Thereby, the work efficiency required for removing the cable 100 can be improved, and the work time required for removing the cable 100 can be reduced.

  As described above, the cable 100 according to the first embodiment of the present invention is a hollow tubular sheath having a transparent sheath portion 107 formed of an insulating material and at least partially formed of a translucent material. 105, a linear conductor (such as the core wire 102) provided inside the outer skin 105, and a light guide member 108 provided inside the outer skin 105 and between the conductor and the inner surface of the outer skin 105. , Is provided.

  According to the cable 100 of the first embodiment according to the present invention, when the visible light is incident from the end of the cable 100, the light guide member 108 that guides the visible light to emit light in the visible light wavelength region is formed. , Can be easily visually recognized through the transparent skin portion 107. Thus, by visually observing an intermediate portion (a portion other than both ends) of the cable 100, the place where the operation of specifying the cable 100 is performed is not limited to the end of the cable 100, and the cable 100 to be specified can be specified. The cable 100 can be easily identified, and the cable 100 to be removed can be easily and accurately specified without being mistaken.

  And by this, the operation | work which removes the specific cable 100 from the bundle of several cables 100, or removes the cable 100 located behind another cable 100 can be performed correctly and quickly. Can do it. Thereby, regardless of the working environment, the work of removing the specific cable 100 can be performed accurately and quickly, so that the working efficiency can be improved and the working time can be shortened.

  Further, the cable 100 according to the first embodiment of the present invention is characterized in that a plurality of transparent skin portions 107 are provided intermittently along the length direction of the skin 105.

  According to the cable 100 of the first embodiment according to the present invention, the cable to be specified is specified without lowering the durability of the outer cover 105, that is, the cable 100, as compared with the case where the entire outer cover 105 is made of the transparent outer cover 105. 100 can be easily specified. Thereby, when the specific cable 100 is removed from the bundle of the plurality of cables 100 according to the first embodiment of the present invention, the remaining cable 100 is damaged due to the removing operation. Can be prevented.

  Further, the cable 100 according to the first embodiment of the present invention is characterized in that the transparent sheath portion 107 has a ring shape centered on the axis of the outer sheath 105.

  According to the cable 100 of the first embodiment according to the present invention, at the time of manufacturing the cable 100, the strictly adjusting the positional relationship between the transparent outer cover 107 and the light guide member 108 can be performed immediately below each transparent outer cover 107. The light guide member 108 can be arranged. As a result, the yield of manufacturing the cable 100 can be improved, and the manufacturing cost of the cable 100 can be reduced.

  In the above-described first embodiment, each of the plurality of transparent sheath portions 107 provided intermittently along the length direction of the cable 100 is a cable having a ring shape centered on the axis of the sheath 105. Although the example of 100 has been described, the shape of the transparent skin 107 is not limited to this.

<Embodiment 2>
(Cable configuration)
Next, the configuration of the cable according to the second embodiment of the present invention will be described. In the second embodiment, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted. FIG. 2 is an explanatory diagram illustrating a configuration of a cable according to a second embodiment of the present invention.

  As shown in FIG. 2, the cable 200 according to the second embodiment of the present invention includes a plurality of transparent sheath portions 201 provided on the same circumference around the axis of the outer sheath 105. It is preferable that the same number of the transparent outer skin portions 201 be provided on the same circumference as the number of the light guide members 108. Further, a plurality of the transparent sheath portions 201 are provided at arbitrary intervals from each other in the length direction of the cable 200, such as "2 meter intervals" and "3 meter intervals".

  According to the cable 200 of the second embodiment of the present invention, the portion of the outer sheath 105 where the black pigment is added to improve the weather resistance and extend the life is continuous without any breakage. Even when a part of the outer cover 105 is formed by the transparent outer cover 201 to which the black pigment is not added, the durability of the outer cover 105, that is, the cable 200 can be maintained.

  This makes it possible to maintain the durability of the cable 200, which can be easily specified, as compared with a conventional cable that does not include the transparent sheath portion 201. Thus, according to the cable 200 of the second embodiment according to the present invention, when removing the cable 200 to be removed from the bundle of a plurality of cables, In addition, it is possible to reliably prevent the remaining cable 200 from being damaged.

  In addition, by providing a plurality of (the same number as the number of light guide members 108) transparent skin portions 201 on the same circumference centered on the axis of the cable 200, the provision of the plurality of light guide members Even if any one of them is displaced from the position immediately below the transparent outer cover 201, the light emission of the other light guide member 108 can be visually recognized. Accordingly, the durability of the cable 200 can be ensured, and the operation of removing the cable 200 can be performed accurately and quickly, so that the operation efficiency can be improved and the operation time can be shortened.

<Embodiment 3>
(Cable configuration)
Next, the configuration of the cable according to the third embodiment of the present invention will be described. In the third embodiment, the same parts as those in the above-described first and second embodiments are denoted by the same reference numerals, and description thereof will be omitted. FIG. 3 is an explanatory diagram illustrating a configuration of a cable according to a third embodiment of the present invention.

  As shown in FIG. 3, in the cable 300 according to the third embodiment of the present invention, the light guide member 108 extends from an end in the length direction of the outer cover 105. The extended light guide member 108 is exposed to the outside of the outer skin 105. An optical connector 301 is provided at an end of each extended light guide member 108. The optical connector 301 can be configured by a ferrule or a holder having the same configuration as the optical connector 301 included in the visible light incidence device.

  When removing the cable 300, the light guide member 108 may expose the outer sheath 105 of the cable 300 to be removed by peeling the outer sheath 105 from the end in the length direction of the cable 300 by a predetermined length. In this case, the optical connector 301 is attached to the exposed light guide member 108 when specifying the cable 300 to be removed.

  In this way, by exposing the light guide member 108, the visible light incident device and the light guide member 108 can be easily and reliably connected using a general-purpose existing optical fiber checker as the visible light incident device. it can. Thereby, the work efficiency required for removing the cable 300 can be improved, and the work time required for removing the cable 300 can be reduced.

  INDUSTRIAL APPLICABILITY As described above, the cable according to the present invention is useful for a cable that conducts electricity or light, and a method for removing a cable, and is particularly suitable for a cable that is laid in plurals and a method for removing a cable.

REFERENCE SIGNS LIST 100 cable 101 tension member 102 core wire 103 protective layer 104 holding member 105 outer cover 106 tape slot 107 transparent outer cover 108 light guide member 200 cable 201 transparent outer cover 300 cable 301 optical connector

Claims (7)

A hollow tubular outer skin having a transparent outer skin portion formed of an insulating material and at least partially formed of a material having translucency,
A linear conductor provided inside the outer skin,
A light guide member provided inside the outer cover and between the conductor and the inner surface of the outer cover;
A cable comprising:   The cable according to claim 1, wherein a plurality of the transparent skin portions are provided intermittently along a length direction of the skin.   The cable according to claim 1, wherein the transparent sheath portion has a ring shape centered on an axis of the sheath.   The cable according to claim 1, wherein a plurality of the transparent sheath portions are provided on the same circumference centered on an axis of the sheath.   The cable according to claim 1, wherein the conductor is a conducting wire that conducts electricity.   The cable according to claim 1, wherein the conductor is an optical fiber through which light passes. Visible light is incident from one end of the cable according to any one of claims 1 to 6,
Identifying the cable that guides the visible light,
Removing the identified cable,
A method for removing a cable, comprising:

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