JP2006235263A - Installation method of optical fiber cable - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an installation method of optical fiber cable for installing an optical fiber cable in a conduit line without causing disconnection. <P>SOLUTION: An end of an installation wire 5 is connected with the end of the optical fiber cable 3. The other end of the installation wire 5 is connected with a spool 15 of a traction device 12 and the installation wire 5 is rolled up by rotating the spool 12. The installation wire 5 is inserted into a plastic cover 23 of substantially conical shape beforehand before the connection of the optical fiber cable 3. A spiral tube 9 is wound around the end part of the optical fiber cable 3. After the installation wire 5 is connected with the optical fiber cable 3, the end part of the optical fiber cable 3 around which the spiral tube 9 is wound is covered with the cover 23. In accordance with rotative operation of an operation handle 17, the spool 15 is rotated and the installation wire 5 is rolled up. In accordance with the rolling up of the installation wire 5, the optical fiber cable 3 is installed in the conduit line. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for passing an optical fiber cable through a pipeline.

  At present, an optical fiber is widely used as a transmission medium for transmitting a large amount of information, thereby further increasing the speed of information transmission. Optical fibers are widely used from short-distance communication such as indoors and premises to long-distance communication connecting cities. In particular, when an optical fiber is used indoors or on the premises, an optical fiber cable in which the outside of the optical fiber is covered with a covering member such as vinyl is used.

  An optical fiber is composed of a core part that transmits light and a clad part that covers the outer periphery of the core part, and is roughly classified into a silica-based optical fiber and a plastic optical fiber (hereinafter referred to as POF) depending on the type of constituent materials. When electronic devices are connected to each other using an optical fiber, an optical fiber cable in which an optical fiber is covered with a covering member is used, thereby preventing the optical fiber from being cut. Furthermore, in some of such optical fiber cables, in order to further increase the tensile strength in the axial direction, the tensile strength wire is covered with a covering member together with the optical fiber.

  By the way, an optical fiber cable disposed indoors is a conduit such as a CD or FS tube (CD tube and FS tube are names defined by “JIS C 8411: 1999 synthetic resin flexible conduit”). However, if the fiber optic cable is excessively pulled when passing the fiber optic cable into the pipeline, the fiber optic cable will be over tensioned. Therefore, the optical fiber cable may be disconnected. In order to solve such problems, an optical fiber cable is provided in which a tensile strength wire that can withstand a constant tension is covered with a covering member together with the optical fiber. The tensile wire is provided in parallel with the optical fiber in the cable, thereby providing an optical fiber cable that cannot be broken under a certain tension. In addition, there is a known method for passing a cable through a pipe using water-absorbent resin powder. In this method, the water-absorbent resin is applied to the outside of the cable and then passed through the pipe to damage the cable. I was able to pass through without. (For example, Patent Document 1)

However, the optical fiber cable in which the tensile strength wire is covered with the covering member together with the optical fiber becomes thick, and it becomes difficult to pass through the existing pipeline. Moreover, it leads to an increase in cost and the flexibility of the optical fiber cable is lost, so that the workability is lowered. Further, in the wire passing method in which the lubricant is applied to the covering member that covers the optical fiber, it may be difficult to remove the lubricant, which may cause inconvenience in connecting the optical fiber cable. .
Japanese Patent Laid-Open No. 2002-241778

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a wiring method for passing an optical fiber cable through a pipeline without disconnection.

  In order to achieve the above object, in the optical fiber cable passing method according to the present invention, the pulling linear member that is passed through the conduit in advance and connected at one end to the optical fiber cable is pulled from the other end. Pass the fiber cable through the pipeline. At this time, a spiral tube in which a long strip made of a low coefficient of friction material is formed in a spiral shape is wound around at least the end of the optical fiber cable to which the linear member for traction is joined, and the optical fiber cable is passed through the conduit. It is characterized by that.

  In addition, the spiral tube is wound in a tapered shape around the end of the optical fiber cable to which the linear member for traction is joined.

  In addition, a tapered guide member is provided at an end of the optical fiber cable to which the pulling linear body is joined, and the tip of the spiral tube is housed in the tapered guide member.

  In addition, a dynamic friction coefficient with a long-strand state polyvinyl chloride made of a low friction coefficient material is 0.45 or less.

  Further, the optical fiber contained in the optical fiber cable is all made of plastic.

  In the optical fiber cable wiring jig of the present invention, a spiral tube in which a long strip made of a low friction coefficient material is formed in a spiral shape, and an end portion of the optical fiber cable around which the spiral tube is wound And an engaging member that engages.

  Further, the engaging member is characterized in that it is formed in a tapered shape so as to accommodate the end portion of the optical fiber cable around which the spiral tube is wound.

  According to the optical fiber cable passing method of the present invention, an end portion of an optical fiber cable in which at least a pulling linear body is joined to a spiral tube in which a long strip made of a low friction coefficient material is spirally formed. The resistance when the optical fiber cable is passed through the conduit can be reduced by winding the optical fiber cable through the conduit, and the optical fiber cable is passed through the conduit without being disconnected.

  In addition, by winding the spiral tube in a tapered shape around the end of the optical fiber cable to which the pulling wire is joined, the resistance during the optical fiber cable passage can be further reduced, and the tube can be more easily An optical fiber cable can be passed through the road.

  Further, a tapered guide member is provided at the end of the optical fiber cable to which the pulling linear body is joined, and the tip of the spiral tube is housed in the tapered guide member, so that the optical fiber cable can be connected. Resistance can be further reduced, and the optical fiber cable can be more easily passed through the pipeline.

  Further, since the dynamic friction coefficient with the long-strand-shaped polyvinyl chloride made of a low friction coefficient material is 0.45 or less, the optical fiber cable can be more easily passed through the pipe.

  Further, since the optical fiber strands included in the optical fiber cable are all made of plastic, the optical fiber cable can be easily passed through a meandering pipeline.

  According to the optical fiber cable wiring jig of the present invention, a spiral tube in which a long strip made of a low friction coefficient material is formed in a spiral shape, and an end portion of the optical fiber cable around which the spiral tube is wound The optical fiber cable can be more easily passed through the tube furnace.

  In addition, the engagement member is formed in a tapered shape so as to accommodate the end portion of the optical fiber cable around which the spiral tube is wound, so that the resistance at the time of wiring is reduced and the optical fiber cable is more easily put into the tube furnace. Can pass through.

  As described above, various types of optical fiber are known, such as those made of quartz, those using a quartz core and using a clad plastic (plastic clad fiber), and plastic optical fibers made entirely of plastic. However, a description will be given taking POF as an example, which is all made of plastic and has excellent flexibility and handling properties. In addition, POF is suitable for indoor wiring compared to silica-based fiber for the above reasons. Furthermore, since the wire diameter is made relatively large, the cable covering it is likely to be thick and easy to wire. From the standpoint of safety, the present invention is optimal for POF cables. As shown in FIG. 1, in the POF cable 3 formed entirely of plastic, two optical fibers 3a are covered with a covering member 3b. As a result, for example, one optical fiber 3a can be used as an ON / OFF signal transmission line, and the other POF 3a can be used as a transmission line for image data or the like, whereby data transmission can be performed efficiently. Further, it is possible to perform bidirectional communication using a single optical fiber by changing the light source wavelength.

  The end of the POF cable 3 is connected to a through wire 5 that is a linear body wound up by a pulling device to be described later. The through wire 5 is, for example, a resin-coated piano wire and can withstand a large tension. The connection between the POF cable 3 and the wire 5 is performed as follows. First, a certain portion of the covering member 3b is removed from the end of the POF cable 3 to expose the optical fiber 3a. The exposed portion is folded and stopped with a vinyl tape 7 to form a ring. The ring-shaped optical fiber 3 a is similarly folded through the through wire 5 and stopped with the vinyl tape 8. The end portion of the POF cable 9 to which the wire 5 is joined is covered with a cover (engagement member) 23 which forms a wire jig together with the spiral tube 9, and the tip of the spiral tube 9 is covered with this cover 23. Is housed in. In addition, when the thickness of the covering member 9b is thin, the covering member 9b may be directly folded without being removed to form a loop, and the wire wire 5 may be connected thereto. In the above description, a piano wire coated with a resin is illustrated as the through wire. However, the through wire is not limited to this, and a wire wire more suitable for the shape of the pipe line and the pipe arrangement environment may be used. Absent. For example, in a pipeline with many bent portions, easy wiring can be expected by using organic fibers that are more flexible but strong against tension.

  A spiral tube 9 is wound around the end of the POF cable 3, for example, at a portion 3 m from the end. The spiral tube 9 is formed in advance in a shape in which a long strip 9a is spirally wound, and the spiral tube 9 is attached to the optical fiber cable 3 so that the end of the POF cable 3 is disposed in the spiral. Wrapped. The spiral tube 9 is made of, for example, nylon, which is a low friction coefficient material, and a certain distance is provided between the adjacent elongated strips 9a. The static friction coefficient and the dynamic friction coefficient of nylon in plastic are about 0.3 to 0.4, and the spiral tube 9 can be easily slid on the plastic or the like. In addition, the spiral tube wound around the POF cable 3 is not limited to nylon, and a spiral tube made of other materials as appropriate, such as Teflon (registered trademark) or polyethylene, may be used. At this time, a material having a low dynamic friction coefficient is preferable as a material of the material. Considering that there are many PVC (polyvinyl chloride) contact surfaces between cables and existing wiring and CD tubes, the coefficient of friction with PVC measured by JIS K 7125 is preferably at least 0.45 or less. More preferably, a material that is 0.35 or less may be used. Specifically, polyethylene, polypropylene, polytetrafluoroethylene, perfluoroalkoxy fluororesin, tetrafluoroethylene hexafluoropropylene copolymer, ethylene tetrafluoride ethylene copolymer, polyvinylidene fluoride, polychlorotrifluoride ethylene, Other fluororesins including vinyl fluoride can be mentioned. By using a spiral tube formed of such a material, the spiral tube can be slid even more easily. In the above description, the spiral tube 9 is wound around a portion 3 m from the end of the POF cable. However, the length of the portion around which the spiral tube is wound is not limited to this, and may be 1 m or 5 m from the end, for example. Furthermore, by setting the outer side of the spiral tube as a low friction coefficient part and the inner side as a high friction coefficient part, the spiral tube does not fall out or shift from the POF cable.

  As shown in FIG. 2, the wire 5 is preferably wound up by the traction device 12. The traction device 7 includes a spool 15, an operation handle 17, a drag mechanism that controls torque transmitted from the operation handle 17 to the spool 15, and a drag adjustment knob 19 that adjusts torque transmitted by the drag mechanism. The housing 21 supports the spool 12 and covers the drag mechanism. A grip portion 12a that is gripped by the user is provided on the upper portion of the traction device 12. For example, the grip portion 12a is gripped by the left hand, and the operation handle 17 is rotated by the right hand.

  The drag mechanism rotates the spool so that tension below the set value is applied to the POF cable 9 according to the operation of the operation handle 17, and the set value is determined by the drag adjustment knob 19. When tension greater than the set value is applied to the POF cable 3, the spool 15 slips with respect to the rotation operation of the operation handle 17.

  A cover 23, which is a tapered guide member, is provided at the end of the POF cable 3 around which the spiral tube 9 is wound. The cover 23 has an umbrella shape formed in a substantially conical shape and is made of polyethylene which is a low friction coefficient material. A through hole 23 a through which the wire 5 is passed is formed at the top of the cover 23, and the cover 23 is previously connected to the wire 5 before the POF cable 3 is bound to one end of the wire 5. Passed through. In the above description, the end of the POF cable 3 around which the spiral tube 9 is wound is covered with the polyethylene cover 23, but the constituent material of the cover is not limited to this. For example, a cover made of a low friction coefficient material such as nylon or Teflon (registered trademark) may be used. Further, the boundary between the cover 23 and the spiral tube 9 may be covered with vinyl tape. As a result, the spiral tube 9 can be prevented from dropping or slipping from the cover 23, and the resistance during wiring can be further reduced. Moreover, you may wind so that the external shape may become a taper shape only with a spiral tube.

  The operation of the above configuration will be described with reference to FIG. A CD tube 25 is disposed indoors such as a house, and a wire wire 5 is passed through the CD tube 25 in advance. One end of the wire 5 is connected to the POF cable 3, and the other end is connected to the spool 15 of the traction device 12.

  A spiral tube 9 is wound around the end of the POF cable 3. An umbrella-shaped cover is passed through the wire 5 in advance, and the end of the POF cable 3 around which the spiral tube 9 is wound is covered with the cover 23. The through wire 5 is wound up by the spool 15 of the traction device 12, and the POF cable 3 moves in the pipeline starting from the end portion around which the spiral tube 9 is wound. At this time, since the end portion of the POF cable 3 is covered with the spiral tube 9, friction generated between the end of the POF cable 3 and the conduit can be suppressed, and the POF cable 3 can be pulled smoothly. Further, since the end portion of the POF cable 3 around which the spiral tube 9 is wound is covered with the cover 23, the POF cable 3 is not caught by an obstacle or a joint located in the pipe line.

  When the spool 15 slips in response to the rotation operation of the operation handle 17, the operation of the operation handle 17 is temporarily stopped, the POF cable 3 is slightly pulled back, and the operation handle 17 is rotated again to perform the POF cable 3 again. Towing. By repeating such an operation, the POF cable 3 can be passed through the pipeline without being disconnected.

  In the above embodiment, the wire 5 is wound up by the spool 15 provided in the traction device 12, but the method of winding the wire is not limited to this. As in the past, the installer may directly pull the wire. Also in this case, the resistance of the line in the pipe line is lowered by the spiral tube, so that the POF cable is not disconnected. Further, for example, the optical fiber cable may be passed through the pipe line by a traction device including a tension reel that winds a wire to apply a constant tension to the optical fiber cable. When the wire is wound up by the tension reel, the tension applied to the wire is detected, and the tension reel is driven according to the detected tension. Therefore, the tension applied to the wire is kept constant during towing. Can do. As a result, the POF cable can be passed through the pipeline without applying excessive tension.

  In addition, by wrapping a spiral tube having a larger interval between the adjacent elongated strips around the optical fiber cable, the contact area between the spiral tube and the conduit can be reduced. Reduction of friction generated between the two can be expected. Furthermore, since the spiral tube becomes easy to bend due to a larger space between the adjacent long strips, the POF cable can be easily passed through a more complicated bent pipe.

  In the above embodiment, the spiral tube 9 is wound around one POF cable 3 in which the two optical fibers 3a are covered with the covering member 3b and is passed through the pipe. The number of is not limited to this and may be a plurality. By winding a spiral tube around a plurality of POF cables and passing them through the pipeline, more POF cables can be easily passed through the pipeline.

  In the above embodiment, the connection portion between the wire 5 and the POF cable 3 is covered with the cover 23, but a vinyl tape may be wound around the connection portion to form a taper shape. By forming the end of the POF cable around which the spiral tube is wound in a tapered shape by such a method, it is possible to prevent the end of the POF cable from being caught at the joint of the pipeline, and the POF cable can be smoothly passed through the pipeline. be able to.

  Examples of the optical fiber cable passing method according to the present invention will be described below. In the examples, the spiral tube was made by processing a sheet made of polytetrafluoroethylene.

<Example 1>
A CD tube 25 made of hard polyvinyl chloride having an inner diameter of 22 mm and having four 90 ° bent portions every approximately 1.8 m was formed. A UTP (Untwisted Twist Pair) cable and a wire 5 were passed through the conduit consisting of the CD tube 25 in advance. The POF cable 3 is a two-core type cable that includes two optical fibers 3a having an outer diameter of 0.75 mm and does not include a tension member. A spiral tube 9 made of polytetrafluoroethylene was wound around. The coefficient of dynamic friction between polyurethane as the coating material and polytetrafluoroethylene in the spiral tube and polyvinyl chloride was 0.52 and 0.04, respectively, as measured according to JIS K 7125. When the through wire 5 was joined to the POF cable 3 and the pulling device 12 was operated to wind up the through wire 5, the POF cable 3 was subjected to a tension of 30N.

<Example 2>
The experiment was performed under the same conditions as in Experiment 1 except that the inner diameter of the CD tube 25 was 16 mm, the cable was passed through a cable with a diameter of 7 mm made of PVC, and the passage portion was narrowed. During winding of the wire 5, a tension of 80 N was applied to the POF cable 3.

<Comparative Example 1>
The experiment was performed under the same conditions as Experiment 1 except that the spiral tube 9 was not wound around the POF cable 3. During winding of the wire 5, a tension of 170 N was applied to the POF cable 3.

<Comparative example 2>
The experiment was performed under the same conditions as in Experiment 2 except that the spiral tube 9 was not wound around the POF cable 3. The POF cable 3 was disconnected during the winding of the wire 5.

It is the perspective view which showed the coupling | bond part of a wire and an optical fiber cable by cut | disconnecting a spiral tube in a plane perpendicular | vertical to an optical fiber cable so that the edge part of an optical fiber cable may be exposed. It is a perspective view which illustrates roughly the wiring method which winds up a wiring cable with a traction device and passes an optical fiber cable through a CD tube. It is a flowchart in the case of passing an optical fiber cable through a pipe line using the wiring method of the present invention.

Explanation of symbols

3 Optical Fiber Cable 3a Optical Fiber 3b Covering Member 5 Wire (Linear)
9 Spiral tube 9a Long strip 12 Pulling device 15 Spool 17 Operation handle 19 Drag adjustment knob 23 Cover (tapered guide member)
25 CD tube

Claims (7)

In the method of passing an optical fiber cable, the optical fiber cable is passed through the conduit by pulling the pulling linear body that is passed through the conduit in advance and connected to the optical fiber cable from the other end.
A spiral tube in which a long strip made of a low friction coefficient material is formed in a spiral shape is wound around at least an end portion of the optical fiber cable to which the linear member for traction is joined, and the optical fiber cable is passed through the pipeline. An optical fiber cable wiring method as a feature.   2. The method of passing an optical fiber cable according to claim 1, wherein the spiral tube is wound in a tapered shape around an end portion of the optical fiber cable to which the pulling linear body is joined.   3. A tapered guide member is provided at an end of the optical fiber cable to which the linear member for traction is joined, and the tip of the spiral tube is housed in the tapered guide member. The optical fiber cable wiring method described.   4. The method of passing an optical fiber cable according to claim 1, wherein a coefficient of dynamic friction with the polyvinyl chloride in a long belt state made of the low friction coefficient material is 0.45 or less.   5. The method of passing an optical fiber cable according to claim 1, wherein all of the optical fiber wires contained in the optical fiber cable are made of plastic.   It has a spiral tube in which a long strip made of a low friction coefficient material is formed in a spiral shape, and an engagement member that engages with an end of an optical fiber cable around which the spiral tube is wound. Fiber optic cable wiring jig. 7. The optical fiber cable wiring jig according to claim 6, wherein the engaging member is formed in a tapered shape so as to accommodate an end portion of the optical fiber cable around which the spiral tube is wound.

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