JPH0662722U - Optical fiber composite overhead ground wire connection fitting - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] In the optical fiber composite overhead ground wire connection fitting, the ingress of rainwater and sea salt particles is prevented to prevent corrosion from occurring and the optical fiber To improve the reliability of the communication line of the composite overhead ground wire. [Structure] A plug member 1 having an insertion hole which is inserted into a lead-in port provided in a connection box and into which an optical fiber unit 3 is inserted.
1, a gripping member 12 that is integrally formed with the plug member 11 and accommodates a part of the outer peripheral portion of the jacket AS wire layer 4, and a jacket AS wire layer that is housed on the gripping member 12. Clamping member 17 which is superposed on the exposed portion of 4 and clamps it
And the clamp member 1 with the outer AS line layer 4 tightened
7 and the gripping member 12, and a covering member 30 that surrounds the outer peripheral portions thereof and waterproofs them. In addition, this covering member is formed of a stretchable cylinder. Further, the covering member is composed of a belt-shaped body and a chuck member bonded to both ends of the belt-shaped body.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a connector structure for connecting optical fiber composite overhead ground wires (OPGW) to each other through a connection box mounted on a tower, and particularly to a connection box and an optical fiber composite overhead ground wire connected to the connection box. The present invention relates to a connector structure in which the outer coat wire layer of a wire has improved waterproofness.

[0002]

[Prior art]

 As shown in FIG. 5, the optical fiber composite overhead ground wire 1 has a function of combining and integrating the optical fiber communication line and the overhead ground wire of the power transmission line, and a plurality of optical fibers as one unit. And an outer coating AS wire layer 4 covering the optical fiber unit 3. The outer coating AS wire layer 4 includes an aluminum pipe 5 and an aluminum covered steel wire (AS wire) twisted around the outer peripheral portion of the aluminum pipe 5. ) 6 and. The aluminum pipe 5 houses the optical fiber unit 3 therein and protects it mechanically. The aluminum steel wire 6 is formed by pushing the aluminum around the steel wire and pulling it out through the die. The steel wire and aluminum are completely integrated by friction welding, and the tension and heat resistance of the steel wire In addition, it has both excellent electrical conductivity and corrosion resistance of aluminum, and has excellent properties as an overhead ground wire. On the other hand, the optical fiber combined with the overhead ground wire can cope with the demand for the transmission circuit of a large amount of signals such as the operation management of the transmission system accompanying the increasing power demand, and the electromagnetic induction disturbance due to the super high voltage. It is a thing. Therefore, the optical fiber composite overhead ground wire 1 which combines the advantages of the optical fiber unit 3 and the aluminum covered wire 6 is widely used as a communication line because of its high reliability after installation.

As shown in FIG. 4, the optical fiber composite overhead ground wire 1 prevents the elongation at high temperatures or strong winds from exerting a burden on the optical fiber inside the junction box 7 provided on the transmission line tower. It is connected after taking enough extra length 8. As described above, in order to pull in and connect only the optical fiber in the connection box 7, it is necessary to support or connect the outer AS line layer 4 to the connection box 7, and generally, the connection metal fitting 9 as shown in FIG. Is used.

FIG. 6 shows a connecting fitting 9 for an optical fiber composite overhead ground wire 1 that has been conventionally used. The connecting fitting 9 holds the optical fiber composite overhead ground wire 1 while connecting to a connection box 7 It is provided at the inlet 10. Specifically, the connection fitting 9 is formed by stripping off the outer coating AS wire layer 4 and introducing the optical fiber unit 3 exposed to a predetermined length into the connection box 7, and at the same time, the outer coating AS wire serving as an outer shell. The layer 4 is grasped and connected to the connection box 7. The connection fitting 9 has a plug member 11 formed at the tip thereof so as to be inserted and fitted into the drawing-in port 10 of the connection box 7, and is integrally formed with the plug member 11, and the outer AS line layer is formed. 4 is provided with a gripping member 12 formed so as to wrap around and grip a part of the outer peripheral portion of 4 and a flange member 13 for fixing to the connection box 7. Further, the grip member 12 is provided with a clamp member 17 which is superposed on the grip member 12 and covers the exposed portion of the outer sheath AS line layer 4 which is wrapped in the grip member 12. The plug member 11 is provided with an insertion hole 14 formed so as to penetrate through the axial portion thereof, and the insertion hole 14 is configured so that the optical fiber unit 3 is inserted while the aluminum pipe 5 is covered. There is. Further, an O-ring (not shown) is attached to the aluminum pipe 5 which is inserted through the insertion hole 14 to prevent rainwater and the like from entering the inside of the junction box 7 along the aluminum pipe 5 in the insertion hole 14. Has been. The casing AS wire layer 4 wrapped in the grip member 12 is configured such that the clamp member 17 is overlapped and clamped. In this way, the optical fiber composite overhead ground wire 1 is gripped by the connection fitting 9, and the plug member 11 is inserted and fitted into the lead-in port 10 of the connection box 7, and the connection box 7 is integrated with the plug member 11. By fixing the flange member 13 formed in a specific manner, they are connected. In addition, the optical fiber unit 3 inserted into the connection box 7 is connected to each of the strands by stripping the aluminum pipe 5 as the coating layer.

[0005]

[Problems to be solved by the device]

 By the way, in the structure of the conventional connecting fitting, as shown in FIGS. 4 and 6, the holding member 12 of the connecting fitting 9 is formed integrally with the plug member 11 and the optical fiber composite overhead wire 1 is used. It has a groove portion for grasping a part of the outer circumference of the outer casing AS line layer 4 which becomes the outer shell of the clamp member 17. The clamp member 17 is provided on the exposed portion of the outer casing AS line layer 4 held in the groove portion. Since they are overlapped with each other, there is a problem that a predetermined gap is generated at the overlap between the clamp member 17 and the grip member 12. In particular, the outer diameter of the optical fiber composite overhead ground wire 1 is not always uniform, and even if the clamp member 17 is tightened to the gripping member 12 with a tightening bolt or the like, a gap tends to be generated. The inventor of the present invention has found out that the following problems occur when a slight gap is formed between the holding member 12 of the connection fitting 9 and the clamp member 17 as described above. When rainwater enters the interior through such gaps, it tends to be difficult to drain and retained, and tends to stay for a long time. In particular, inside the gripping member 12, the cut surface when the aluminum steel wire (AS wire) is peeled off is exposed as it is, and if rainwater stays on the cut surface of the aluminum and steel wire, these Corrosion due to the contact potential difference between the members easily occurs. Then, when such corrosion occurs for a long period of time, a hole is opened in the aluminum pipe 5 covering the optical fiber unit 3 or the strength thereof is lowered and the aluminum pipe 5 is deformed, so that the optical fiber unit 3 housed inside is corroded. Due to the damage, not only the signal transmission loss of the optical fiber unit 3 may increase, but also a serious accident such as replacement of the optical fiber composite overhead ground wire 1 may occur due to the disconnection of the optical fiber. When such an accident occurs, the optical fiber composite overhead ground wire 1 has many advantages as described above, but since the possibility of affecting the reliability as a communication line becomes large, what is the problem of corrosion? However, it is a problem that must be solved.

Accordingly, the present invention effectively solves the problem of corrosion in the connection of the conventional optical fiber composite overhead ground wire, and provides an optical fiber composite overhead ground wire connection fitting that has excellent durability and communication reliability. The purpose is to do.

[0007]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention is a connection in which an outer layer AS wire layer of an end portion of an optical fiber composite overhead ground wire is stripped off and an optical fiber unit exposed by a predetermined length is mounted on a transmission line tower. In the connector structure for guiding the optical fiber composite overhead ground wire to the connection box by holding the outer AS line layer while guiding it into the box, it is inserted into the lead-in port provided in the connection box, A plug member having an insertion hole for guiding the fiber unit into the connection box, and a grip member integrally formed with the plug member for enclosing and gripping a part of the outer peripheral portion of the outer AS line layer. And a clamp member for clamping the optical fiber composite overhead ground wire on the gripping member and on the exposed portion of the envelope AS line layer wrapped by the clamp member, and the clamp for clamping the envelope AS line layer. Material and grip Wrapping an outer peripheral portion of the member is constituted by a covering member for waterproofing them.

In addition, a tube-shaped tubular body that surrounds the covering member along the longitudinal direction around the outer periphery of the clamp member that clamps the outer AS line layer and the gripping member and that has elasticity. Composed by

Further, the strip-shaped body and the both ends of the strip-shaped body are joined to each other so as to surround the covering member along the outer periphery of the clamp member and the gripping member that clamp the outer-layer AS line layer. Therefore, it is composed of a chuck member.

[0010]

[Action]

 With the above-described configuration, the covering member that covers the outer peripheral portion of the grip member and the clamp member that covers the AS line layer is provided to waterproof them, so that the inside of the grip member and the clamp member overlaps with each other. Since rainwater does not enter the inside, it is possible to prevent corrosion inside.

Further, since the covering member is surrounded by the outer circumference of the gripping member and the clamp member covering the AS line layer along the longitudinal direction thereof, and is formed of a stretchable tubular body, By overlapping the clamp member with the grip member and clamping them, and then attaching the covering members to these, the clamping force can be increased and the covering can be performed, and the covering can be performed accurately according to the change in diameter of the optical fiber composite overhead ground wire to be gripped. can do.

Further, since the covering member is formed of a belt-shaped body, the optical fiber composite overhead wire can be clamped and then attached by winding the covering member around the outer periphery of the holding member and the clamp member. .

[0013]

【Example】

 An embodiment of the present invention will be described below with reference to FIG. As shown in FIG. 1, the optical fiber composite overhead ground wire 1 includes an optical fiber unit 3 having a plurality of optical fibers as one unit and an outer cover AS wire layer 4 which covers the optical fiber unit 3 and serves as the outermost shell. The outer AS wire layer 4 is composed of an aluminum pipe 5 and an aluminum steel wire (AS wire) 6. The connection fitting 9 is provided with a plug member 11 which is inserted into and fitted into the lead-in port 10 of the connection box 7 at the tip thereof, and is formed integrally with the plug member 11 to hold the outer AS line layer 4. The member 12 is provided. Further, between the plug member 11 and the grip member 12, there is a flange member 13 extending in the radial direction and abutting so as to cover the outer peripheral edge portion of the lead-in port 10 and connecting and fixing it to the connection box 7. Has been formed. The plug member 11 is formed with an insertion hole 14 on the axis thereof, through which the optical fiber unit 3 covered with the aluminum pipe 5 is inserted. A space between the aluminum pipe 5 and the insertion hole 14 is sealed with an O-ring or the like (not shown) so that rainwater does not enter the inside of the connection box 7. Further, an optical fiber unit supporting portion 15 having an insertion hole 14 for inserting the optical fiber unit 3 in a predetermined length is provided in the holding member 12 formed integrally with the plug member 11. At the same time, a housing groove portion 16 for fitting and gripping a substantially half outer circumference of the AS line layer 4 is formed. The housing groove portion 16 is configured to have a semi-cylindrical shape. In addition, a clamp member 17 that is opposed to the holding groove portion 16 of the grasping member 12 and that covers the AS line layer 4 that is exposed by being left unwrapped in the holding groove portion 16 is overlapped. The clamp member 17 has a semi-cylindrical shape. That is, as shown in the drawing, the accommodating groove portion 16 for gripping the AS line layer 4 is formed in a substantially semi-cylindrical shape, and the clamp member 17 is also formed in a substantially semi-cylindrical shape. By overlapping the clamp members 17, a cylindrical body surrounding the optical fiber composite overhead ground wire 1 having a substantially circular cross section is formed. In addition, insertion holes (not shown) for inserting tightening bolts (not shown) are formed at both sides of the clamp member 17. Further, the gripping member 12 for fitting and gripping the optical fiber composite overhead ground wire 1 is formed in a substantially semi-cylindrical shape, and the clamping member 17 formed in the substantially semi-cylindrical shape is superposed on it. Thus, the outer peripheral portions of the clamp member 17 and the grip member 12 are configured to have a substantially circular cross section.

In particular, the present invention is provided with a covering member 30 that encloses the outer peripheral portions of the clamp member 17 and the grip member 12 that form the above-described substantially circular cross section and waterproofs them. The covering member 30 is formed so that the inner diameter thereof is fitted to the outer peripheral portions of the clamp member 17 and the gripping member 12 which cover the outer AS line layer 4, and the length in the longitudinal direction thereof is the above. It is formed into a tubular body or a tubular body so as to surround the outer peripheral portion over its entire length. The covering member 30 is made of a flexible or stretchable synthetic resin material or rubber.

Next, the operation of the first embodiment will be described.

As shown in FIG. 2, when connecting the optical fiber composite overhead ground wire 1 to the connection box 7 mounted on the transmission line tower, the optical fiber composite overhead ground wire 1 to be connected in advance has a cylindrical shape. After fitting the covering member 30 of the above, the optical fiber unit 3 covered with the aluminum pipe 5 is inserted into the plug member 11 constituting the connecting fitting 9 through the insertion hole 14, and the accommodating groove portion 16 of the holding member 12 is inserted. The outer AS line layer 4 is held inside.

Next, a clamp member 17 is superposed on the exposed portion of the grasped AS line layer 4 so as to cover the exposed portion, and as shown in the drawing, the clamp member 17 is secured to the clamp member 17 by a tightening bolt 19 or the like. The grip member 12 is fastened by sandwiching the outer AS line layer 4. In this way, after the clamp member 17 is fastened, the tubular covering member 30 that has been fitted into the optical fiber composite overhead ground wire 1 in advance is provided on the outer peripheral portion between the clamp member 17 and the grip member 12. Around the outer circumferences of the clamp member 17 and the gripping member 12 which are sequentially fed out and grip the outer AS line layer 4, the outer circumferences of the clamp member 17 and the grip member 12 are surrounded and covered so as to cover the entire length along the longitudinal direction. Then, the optical fiber unit 3 is introduced from the inlet 10 of the connection box 7, and the plug member 11 is inserted into the inlet 10 via an O-ring (not shown) between the connection box 7 and the flange member 13. And the connection box 7 and the flange member 13 are fixed with screws 18.

As described above, by covering the outer peripheral portions of the clamp member 17 and the gripping member 12 with the covering member 30 so as to surround them, the joint member between the clamp member 17 and the gripping member 12 is provided inside the joint member 17 and the gripping member 12. It is possible to prevent infiltration of rainwater and the like.

As described above, since the cut end of the jacketed AS line layer 4 to be clamped can be sealed from rainwater or the like, the occurrence of corrosion can be prevented and reliability of the communication line can be minimized. Can be improved. In addition, in this embodiment, the covering member 30 is molded into a cylindrical or tube-shaped cylindrical body from a flexible or stretchable synthetic resin material or rubber. By setting the inner diameter smaller than the outer diameter of the clamp member 17 to be clamped and the grip member 12 to be overlapped with each other, the fastening force between the clamp member 17 and the grip member 12 with respect to the AS line layer 4 of the jacket can be increased. In addition to the above, it is possible to perform accurate coating without separating from the clamp member 17 and the grip member 12. In addition, as shown in FIG. 2, the covering member 30 is molded with a synthetic resin material or rubber having flexibility or elasticity, and is set to be longer than the entire length of the clamp member 17 and the gripping member 12. This makes it possible to cover the lower end portions of the clamp member 17 and the grip member 12 and the outer peripheral portion of the optical fiber composite overhead ground wire 1 to be inserted into the connection fitting 9. As described above, by covering the boundary portion between the connecting fitting 9 and the optical fiber composite overhead ground wire 1 with the covering member 30, it is possible to completely prevent rainwater from entering the connecting fitting 9.

Next, another embodiment of the present invention will be described.

As shown in FIG. 3, the covering member 30 surrounds the outer circumference of the clamp member 17 and the gripping member 12 that clamp the outer AS line layer 4, and the strip-shaped body 32 to surround the strip-shaped body 32 and the strip-shaped body 32. It is mainly composed of a chuck member 33 joined to both ends of the body 32. The strip-shaped body 32 is formed of a flexible or stretchable synthetic resin material or rubber as in the above-described embodiment. Further, both ends of the band-shaped body 32 are each folded outward by a predetermined length to form a folded piece 34. A chuck member 33 as shown in the drawing is detachably attached to these folding pieces 34 so as to connect the band-shaped body 32 in a tubular shape and bind the band-shaped body 32 tightly. According to this embodiment, after the outer AS line layer 4 is clamped by the clamp member 17 and the grip member 12, the strip-shaped body 32 is wound along the outer periphery of the outer AS line layer 4 and the folded pieces 34 at both ends thereof are wound. By engaging the chuck member 33 with the cover member 30, the covering member 30 can be attached to the connecting fitting 9 to cover it.

In particular, in this embodiment, when connecting the optical fiber composite overhead ground wire 1 to the connection fitting 9, it is necessary to fit the covering member 30 to the optical fiber composite overhead ground wire 1 side in advance. Instead, it is versatile in that it can be easily attached to the connection fitting 9 of the existing optical fiber composite overhead ground wire 1 to cover it.

In any of the above embodiments, when the covering member 30 is attached to the outer peripheral portions of the clamp member 17 and the gripping member 12 that form the connection fitting 9, an adhesive is applied to the inner surface of the covering member 30. By applying and attaching to the connection fitting 9, it is possible to prevent the covering member 30 from coming off and to improve the waterproof property. Furthermore, the covering member 30 can be firmly attached to the connecting fitting 9 by molding the covering member 30 with a heat-shrinkable synthetic resin material, mounting it on the connecting fitting 9, and then heating and shrinking it. In particular, as shown in FIG. 2, it is also possible to attach the covering member 30 to the connecting fitting 9 and then heat it to shrink the lower end so that the outer end of the composite overhead ground wire 1 is brought into close contact.

[0024]

[Effect of device]

 As is clear from the above description, the present invention produces the following excellent effects.

(1) In the optical fiber composite overhead ground wire connecting fitting, it is possible to prevent rainwater and sea salt particles from entering inside, and prevent corrosion from occurring in advance. This effectively solves the problem, and the durability of the optical fiber composite overhead ground wire is improved, and the reliability of this communication line can be greatly improved.

(2) The structure is simple, and it is versatile in that it can be used for existing connection fittings.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing an embodiment of the present invention.

FIG. 2 is a partially cutaway side view showing an embodiment of the present invention.

FIG. 3 is a partial perspective view showing another embodiment of the present invention.

FIG. 4 is a partial side view showing a conventional embodiment.

FIG. 5 is a cutaway plan view showing a conventional example.

FIG. 6 is a partial perspective view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical fiber composite overhead ground wire 3 Optical fiber unit 4 Envelope AS wire layer 7 Connection box 9 Connection metal fitting 10 Entry port 11 Plug member 12 Gripping member 17 Clamping member 30 Covering member 32 Belt-shaped body 33 Chuck member

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location H02G 15/02 7028-5G

Claims (3)

[Scope of utility model registration request] 1. An outer jacket A of an optical fiber composite overhead ground wire terminal portion.
A connector structure for stripping the S-line layer and introducing the optical fiber unit exposed for a predetermined length into a connection box mounted on a transmission line tower and connecting and supporting an optical fiber composite overhead ground wire to the connection box. In the connection box, the plug member having an insertion hole for inserting the optical fiber unit into the connection box, and the outer casing AS formed integrally with the plug member. A gripping member that wraps and grips a part of the outer peripheral portion of the wire layer, and a clamp that is overlapped on the gripping member and an exposed portion of the outer AS line layer that is wrapped by the gripping member to clamp the optical fiber composite overhead ground wire An optical fiber composite overhead ground wire, comprising: a member; and a covering member that encloses the outer peripheral portions of the clamp member and the gripping member that clamp the AS line layer of the jacket, and that waterproofs them. Fittings. 2. The covering member is constituted by a tubular tube body that is stretchable and surrounds an outer peripheral portion of the clamp member that clamps the outer AS line layer and the gripping member along the longitudinal direction thereof. The optical fiber composite overhead ground wire connecting fitting according to claim 1, wherein the connecting fitting is provided. 3. The covering member is formed in a band shape so as to surround the clamping member and the gripping member that clamp the outer sheath AS line layer, and is joined to both ends of the band member. The optical fiber composite overhead ground wire connecting fitting according to claim 1, wherein a chuck member is provided as much as possible.