JP2008109752A - Repairing method for connecting part of power cable and repair device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a repairing method for a connecting point of a power cable which can reduce the work expense by facilitating the replacement work of the connecting point of the power cable, and to provide a repair device. <P>SOLUTION: The repair method comprises a cutting process for cutting the connecting point 2, an extrusion process which extrudes the power cable 1 from a cylinder, by pressing the power cable 1 gripped in the cylinder of a power cable connecting member 13 from the cutting face side of the cut connecting part 2; and a reconnecting process which attaches a new connecting member 26 to the end 19 of the power cable 1, extruded from the cylinder of the power cable connecting member 13 and reconnects the power cable 1 to a connected body 31, by fixing the connecting member 26 to the connected body 31. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a method for repairing a connecting portion of a power cable and a repair device.

  The power system is composed of a wide variety of power transmission / distribution equipment such as power cables, switches, and transformers, from a wide-area power transmission network connecting regions to a terminal distribution network connecting small consumers. The power system is spread nationwide from the mountainous area to the metropolitan area, and appropriate power transmission / distribution equipment is selected according to the power demand at the installation location, and is installed in each region.

There are a wide variety of power cables from wide-area power transmission networks to power transmission / distribution networks in buildings, and appropriate ones are selected according to the voltage and current to be transmitted. For example, in a wide-area transmission network that requires large-capacity transmission capacity, the overhead transmission line connecting the towers is insulated and supported by an insulator, and power is transmitted at a special high voltage such as 500 kV or 275 kV. Is secured. On the other hand, in the distribution network at the end, which requires only a small capacity of power transmission capability, the power cable insulation performance can be ensured even with an insulation member composed of rubber coating etc. by transmitting power at a voltage of 22 kV or 6.9 kV. I am doing it. In addition, these power cables are connected to each other by a connection portion that is not easily disconnected even when exposed to wind and rain (see, for example, Patent Document 1).
Japanese Patent Laid-Open No. 10-27641

  A power cable composed of an insulating member such as a rubber coating can be easily installed on a power pole or the like, but it is necessary to replace the insulating member periodically in order to maintain the insulating performance. Here, the connecting portion connecting the power cables also needs to have sufficient insulation performance as with the power cable. However, the connection part that connects the power cables is configured not to be easily detached even if a tensile force acts upon exposure to wind and rain. Therefore, when exchanging the connection portion of the power cable, it is necessary to cut both ends of the connection portion. However, if both ends of the connecting portion are cut, the length of the power cable is shortened. Therefore, it is necessary to prepare an extension cable for adding the cut portions and connect the power cables on both sides of the cut portion using two connecting portions. Since it is necessary to use one extension cable and two connection members to replace one connection portion, the number of man-hours is increased, and the increase in the number of connection portions causes an increase in future equipment maintenance costs.

  Then, this invention makes it a subject to provide the repair method and repair apparatus of the connection part of a power cable which make the exchange operation | work of the connection part of a power cable easy, and reduce a construction cost.

  In order to solve the above-mentioned problem, the present invention is a method for repairing a connecting portion of a power cable, which cuts the connecting portion, pushes out the power cable from the cut surface side, and adds a new one to the end of the extruded power cable. A connecting member is attached and connected to the connected body.

Specifically, the present invention provides a power cable inserted into an opening provided at an end portion of a cylindrical power cable connecting member by pressing and gripping the power cable on the inner peripheral wall surface in the cylinder. A cutting step of cutting the connection portion so as to intersect the power cable held in a cylinder of the power cable connection member, A pressing step of pushing out the power cable from within the cylinder by pressing the power cable held in the cylinder of the power cable connecting member from the cut surface side of the cut connection portion; and the power cable connecting member A reconnection step of attaching a new connection member to the end of the power cable pushed out from the cylinder and reconnecting the power cable to the connection target by fixing the connection member to the connection target. , Comprising a.

  There are various types of power cable connecting portions, but the power cable connecting portion repair method according to the present invention is inserted into an opening provided at an end of a cylindrical power cable connecting member. It is assumed that the connecting portion connecting the power cable to the body to be connected is repaired by pressing and gripping the power cable being pressed on the inner peripheral wall surface in the cylinder.

  Generally, a power cable used for an overhead power transmission line or the like generates tension when exposed to wind and rain. Therefore, the connection portion firmly connects the power cables so that they do not easily come off even when tension is applied. Therefore, when pulling out the connecting portion holding the power cable by press-contacting with the inner peripheral wall surface in the cylinder, it is necessary to apply a great amount of tension to the power cable. Here, the outside of the power cable is covered with an insulating film. Therefore, when pulling out the power cable, a great tension is applied to the insulating coating. Since the insulating coating is made of rubber or the like, the strength against tensile force is weaker than that of a core wire made of metal. For this reason, when an electric power cable is pulled out, an insulating film may extend and may break.

  On the other hand, when pushing out the power cable press-fitted into the cylinder, a pressing force is applied to the end of the power cable. For this reason, it is possible to directly apply a pressing force to the core wire exposed at the end of the power cable. Therefore, it becomes possible to efficiently transmit the pressing force to the power cable, and it does not apply a great amount of tension to the insulating coating as it is pulled out, and does not damage the insulating coating. Since the power cable is pushed out from the cylinder without damaging the insulating coating, the existing power cable can be used effectively.

  Therefore, the method for repairing the connecting portion of the power cable according to the present invention includes a cutting step of cutting the connecting portion, a pressing step of pushing out the power cable from the cylinder of the power cable connecting member of the cut connecting portion, and the extruded power cable. And a reconnection step of attaching the connecting member to the end of the connector and reconnecting to the connected body.

  In the cutting step, the connection portion connecting the power cables is cut. When cutting the connecting portion, the connecting portion is cut so as to intersect with the power cable held in the cylinder of the power cable connecting member. When cutting the connection portion, it is possible to expose the end portion of the power cable on the cut surface of the connection portion by cutting at least so as to intersect the power cable. Note that when cutting the connection portion, the effect according to the present invention can be realized if it is cut at least so as to intersect the power cable, but it is easier to cut the power cable if it is cut substantially orthogonal to the power cable. It can be extruded.

  In the pressing step, the power cable held in the cylinder of the power cable connecting member is pressed, and the power cable is pushed out from the cylinder of the power cable connecting member. When pressing the power cable, the power cable is pressed from the cut surface side of the connection portion cut by the cutting step. Since the end portion of the power cable is exposed on the cut surface side of the connection portion cut by the cutting step, the core wire of the power cable can be directly pressed. As a result, it is possible to efficiently transmit the pressing force to the power cable and push the power cable out of the power cable connecting member without damaging the insulating coating.

In the reconnection process, a new connection member is attached to the end of the power cable pushed out from the cylinder of the power cable connection member, and the power cable is reconnected to the connected body. The connecting member is not limited to the above-described cylindrical power cable connecting member, and different types of connecting members may be used. By fixing the connecting member attached to the end of the power cable to the connected body, the power cable can be connected to the connected body again.

  As described above, it is possible to effectively use the existing power cable, facilitate the replacement work of the connecting portion of the power cable, and reduce the construction cost. When refurbishing the power cable connection part, it is a common practice to reduce the construction cost by eliminating the need to replace the existing power cable by deliberately performing a process that is contrary to the renovation of the connection part, cutting the connection part. An extremely great effect that cannot be easily conceived by common sense of technology is exhibited.

  In the above-described method for repairing a connecting portion, the connecting portion includes power cables inserted into openings provided at both ends of the power cable connecting member. The power cables are connected to each other in a state where they are in contact with each other by pressing and gripping each of the power cables on the inner peripheral wall surface in the cylinder. In the reconnection step, the power cables may be reconnected to each other by attaching the crimp terminals to the end portions of the power cables and connecting the crimp terminals.

  When replacing existing connections that connect power cables to each other, when it is difficult to bring power cables close to each other depending on the distance between adjacent power poles and the routing of wired cable ducts There is. In such a situation, if both ends of the connecting portion connecting the power cables are cut, it becomes extremely difficult to reconnect the power cables that have been cut and shortened in length. Installation is necessary.

  Therefore, in the case of a connecting portion using a power cable connecting member that is inserted into the openings at both ends and connects the power cables to each other, in the cutting step, the vicinity of the substantially central portion of the connecting portion is cut. . By cutting the vicinity of the substantially central portion of the connection portion of the power cable so as to cross the power cable, the end portions of the power cable are exposed at the respective cut surfaces of the connection portion divided into two. Also, since the power cable is cut near the center of the connection part, the power cable will not be cut short, and an extension cable may be required when reconnecting the power cables. Absent.

  Next, in the reconnecting step, crimp terminals are respectively attached to the ends of the two power cables pushed out by the pressing step from the power cable connecting member of the connecting portion divided in two. Then, the power cables are reconnected to each other by connecting the crimp terminals.

  As described above, it is possible to facilitate the replacement work of the connecting portions for connecting the power cables to reduce the construction cost.

  Further, the present invention can also be understood from the aspect of an object. That is, according to the present invention, the power cable inserted into the opening provided at the end of the cylindrical power cable connecting member is pressed against and gripped by the inner peripheral wall surface of the cylinder, thereby covering the power cable. A repair device used when repairing a connection portion connected to a connection body, the rod-shaped pressing portion having a size that can be inserted into the cylinder of the power cable connection member, and the cylinder of the power cable connection member The pressing portion is driven in a direction to push out the power cable held in the cylinder of the power cable connecting member from the cut surface side of the connecting portion cut so as to intersect with the power cable held by Thus, the power cable connecting member is configured such that the pressing force is transmitted to the drive mechanism that pushes the power cable out of the cylinder and the power cable held in the cylinder of the power cable connecting member. And a fixing mechanism for fixing the drive mechanism.

  The power cable refurbishing apparatus according to the present invention grips the power cable inserted into the opening provided at the end of the cylindrical power cable connecting member by pressure contact with the inner peripheral wall surface in the cylinder. It is used when the power cable is removed from the connection part connected to the non-connector.

  As described above, a power cable used for an overhead power transmission line or the like is firmly fixed so that it does not easily come off even when tension is applied to the connection portion. In addition, considering the reuse of the power cable, it is preferable to push the power cable by applying a force in the pressing direction to the power cable, rather than pulling the power cable by applying a pulling force to the power cable. Street.

  Therefore, the present invention is a repair device used when repairing a connection portion of a power cable, and includes a pressing portion, a drive mechanism, and a fixing mechanism.

  The pressing portion is composed of a bar having a size that can be inserted into the cylinder of the power cable connecting member. The pressing portion presses the end portion of the power cable held inside the power cable connecting member at the tip of the rod. Since the pressing portion presses the end of the power cable with the tip of the rod, the outer diameter of the rod is preferably substantially the same as or smaller than the outer diameter of the power cable. In addition, since the pressing portion pushes out the power cable gripped by being pressed against the inner peripheral wall surface in the cylinder of the power cable connecting member, it is preferable that the pressing portion has a strength that does not deform even when a pressing force is applied. In addition, since a press part presses the edge part of an electric power cable, it must not be a sharp shape.

  The drive mechanism drives the pressing portion in a direction to push out the power cable held in the cylinder of the power cable connecting member. A drive mechanism drives a press part from the cut surface side of the connection part cut | disconnected so that it might cross | intersect the power cable currently hold | gripped in the cylinder of a power cable connection member. This is because the end portion of the power cable is exposed on the cut surface side of the cutting portion, so that the power cable is easily pressed. The power cable is pressed against the inner peripheral wall surface in the cylinder of the power cable connecting member and is gripped by the frictional force between the power cable and the power cable connecting member. Therefore, the drive mechanism drives the pressing portion with a force stronger than this frictional force. The drive mechanism pushes the power cable out of the cylinder by driving the pressing portion.

  The fixing mechanism fixes the drive mechanism to the power cable connecting member. When pushing out the power cable from the power cable connecting member, the repulsive force when the power cable is pressed may be transmitted to the power cable connecting member. This is because a repulsive force when the power cable is pressed is transmitted to the power cable connecting member, thereby generating a force for separating the power cable and the power cable connecting member. Therefore, the drive mechanism for applying a pressing force to the power cable is fixed to the power cable connecting member, and the repulsive force when the power cable is pressed is transmitted to the power cable connecting member. Thereby, it is possible to apply a pressing force to the power cable and pull it away from the power cable connecting member.

  As described above, when replacing the connection portion of the power cable, the power cable can be easily pushed out from the power cable connection member.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the repair method and repair apparatus of the connection part of a power cable which make the exchange operation | work of the connection part of a power cable easy, and reduce a construction cost.

  Hereinafter, the best mode for carrying out the present invention will be described by way of example. Embodiment shown below is an illustration and this invention is not limited to these.

  FIG. 1 is a front view showing a connection portion 2 of a power cable 1 to be repaired in a method for repairing a connection portion 2 of a power cable 1 according to an embodiment of the present invention. FIG. 2 is an enlarged view of the cross section of the connection portion 2 of the power cable 1. In the present embodiment, it is assumed that the plug-in type linear connection portion of the 22 kV power cable that is an overhead power transmission line installed on the utility pole 3 is replaced. However, the present invention is not limited to such a connecting portion, and may be of any type as long as it is a connecting portion of a plug-type power cable that is inserted into the hole. In addition, although the overhead power transmission line is provided for three phases and there are three connection portions 2, for the sake of convenience of explanation, the description will be made on the assumption that one connection portion 2 is repaired. Needless to say, the other two connecting portions 2 can be repaired in the same manner.

  In FIG. 3, the work flow of the repair method of the connection part 2 of the power cable 1 which concerns on a present Example is shown. Hereinafter, a method for repairing the connecting portion 2 according to the present embodiment will be described with reference to the work flow diagram according to FIG. 3.

<Step 1>
The operator prepares tools, materials, etc. (S101). For equipment and tools, band saw 4, wire saw, generator, gold file, cable drum, insulator stripping tool, torque wrench, ratchet wrench, cable band 5, stainless steel universal band 6, silicon sticking strip, repair device 7 Prepare etc. As materials, a cable cleaner, JK Wiper (registered trademark), ACP tape, semiconductive fusion tape, waterproof tape, adhesive polyethylene tape 8, waste cloth, silicon grease, etc. are prepared. Further, the worker attaches a fall prevention net or a light worktable around the work place as necessary.

<Step 2>
Next, the worker removes the support fitting 9 that supports the connecting portion 2 (S102). FIG. 4 shows a working method when removing the support fitting 9. As shown in FIG. 4, the operator removes the support fitting 9 that supports the connection portion 2 to be repaired, and then disturbs the operation of the connection portion 2 of the healthy-phase power cable 1 that does not perform the operation. The cable band 5 is temporarily fixed to the utility pole 3 so that it does not occur.

<Step 3>
Next, the worker removes the peripheral member 10 (S103). The peripheral member 10 includes a clamp 11 and a pipe 12. FIG. 5 shows a working method when removing the peripheral member 10. As shown in FIG. 5, the operator removes the holding member, the spiral protective band, the grounding clamp, the mounting bolt, and the like, and then moves the clamp 11 to the side and slides the pipe 12 to remove the peripheral member 10. Since the length of the pipe 12 is about 75 cm, the operator shifts the clamp 11 and the pipe 12 to the side by about 45 cm. By shifting the clamp 11 more than half of the length of the pipe 12, it is possible to expose the vicinity of the central portion of the old insulating cylinder 13 (corresponding to the “power cable connecting member” in the present invention).

<Step 4>
Next, the operator measures the center of the old insulating cylinder 13 (S104). Based on the dimensions of the old insulating cylinder 13, the operator measures the center position at an equal distance from both ends.

<Step 5>
Next, the operator cuts the old insulating cylinder 13 (S105) (corresponding to the “cutting step” in the present invention). FIG. 6 shows a working method when cutting the old insulating cylinder 13. As shown in FIG. 6, the operator uses the band saw 4 to cut the center position of the old insulating cylinder 13 measured in S104. The worker cuts the center position of the old insulating cylinder 13 so as to be substantially orthogonal to the power cable 1 inserted into the old insulating cylinder 13. Further, the operator supplies power to the band saw 4 using a generator or a cable drum when cutting the old insulating cylinder 13. Although the operator cuts the center position of the old insulating cylinder 13, it is not required to be strictly accurate, and the worker may cut a position slightly deviated from the center.

<Step 6>
Next, the operator pushes out the power cable 1 from the old insulating cylinder 13 (S106) (corresponding to the “pressing step” in the present invention). 7 and 8 show a working method when the power cable 1 is pushed out from the old insulating cylinder 13. As shown in FIG. 7, the worker wears a repair device 7 for pushing out the power cable 1 from the old insulating cylinder 13. Specifically, the operator fits the fixing mechanism 14 of the repair device 7 along the outer peripheral side of the old insulating cylinder 13. Then, the fixing bolt 15 is tightened to hold the old insulating cylinder 13 by the fixing mechanism 14, and the repair device 7 is fixed to the old insulating cylinder 13. When the fixing mechanism 14 is fitted into the old insulating cylinder 13, the driving mechanism 16 is located on the cutting surface 17 side of the old insulating cylinder 13 and the pressing portion 18 is exposed to the cutting surface of the old insulating cylinder 13. It arrange | positions so that it may contact the edge part 19 of the cable 1. FIG. And as shown in FIG. 8, the drive mechanism 16 is rotated using a ratchet wrench. As a result, the pressing portion 18 is driven in the direction of pushing out the power cable 1 by the drive mechanism 16, and the power cable 1 held in the cylinder of the old insulating cylinder 13 is pushed out. In extruding the power cable 1, if the silicon between the old insulating cylinder 13 and the power cable 1 is peeled in advance using a silicon sticking peeling rod, the power cable 1 is pushed out compared to the case where the silicon is not peeled off. Even smoother.

<Step 7>
Next, the worker cuts the contact portion 20 that electrically connects the power cables 1 to each other (S107). FIG. 9 shows a working method when cutting the contact portion 20. As shown in FIG. 9, the operator uses a band saw 4 or a wire saw to cut and remove the contact portion 20 attached to the end of the power cable 1. The operator also removes the spacer 21 fixed to the end of the power cable 1.

<Step 8>
Next, the worker strips off the insulating coating 22 at the end of the power cable 1 (S108). FIG. 10 shows a working method when the insulating coating 22 at the end of the power cable 1 is peeled off. As shown in FIG. 10, the operator peels off about 5 cm of the insulating coating 22 at the end of the power cable 1 using an insulator stripping tool, and exposes the core wire 23 that is a conductor.

<Step 9>
Next, the worker cleans the insulating coating 22 of the power cable 1 with a cable cleaner or a JK wiper (S109). The operator cleans the insulating coating 22 of the power cable 1 around the position where the spacer 21 is fixed using a cable cleaner or a JK wiper.

<Step 10>
Next, the worker winds the ACP tape around the power cable 1 (S110). The operator wraps the ACP tape in one reciprocal half flap (two layers) from the end of the power cable 1 to about 19 cm so as to overlap the shielding layer 24 of the power cable 1. When winding the ACP tape, the operator should be careful not to create wrinkles or voids while pulling with a uniform force. Half wrapping is a method of winding a tape around a rod-shaped object while spirally wrapping the tapes in half. Moreover, one reciprocation means starting winding of the tape from one end side of the target portion, turning back when the winding to the other end side is completed, and winding the tape to the position where the winding of the tape is started. .

<Step 11>
Next, the operator fits the spacer 21 into the power cable 1 (S111). FIG. 11 shows a working method when the spacer 21 is fitted. When the operator fits the spacer 21, the silicon grease is uniformly applied to the inside of the spacer 21, the insulating coating 22 of the power cable 1, and the surface of the wound ACP tape. Then, the operator fits the power cable 1 while turning the spacer 21.

<Step 12>
Next, the worker attaches the crimp terminal 25 to the power cable 1 (S112). FIG. 12 shows an operation method when the crimp terminal 25 is attached. As shown in FIG. 12, the operator fits the crimp terminal 25 on the core wire 23 of the power cable 1. Then, a load of 40 t is applied to the crimp terminal 25 twice, and the crimp terminal 25 is crimped to the core wire 23 of the power cable 1. The operator removes burrs on the surface of the crimp terminal 25 generated by crimping of the crimp terminal 25 with a file or the like. In addition, when applying a load to the crimp terminal 25, the operator pays sufficient attention to the wrinkles of the core wire 23 so that the core wire 23 is not kinked.

<Step 13>
Next, the operator inserts the power cable 1 into the new insulating cylinder 26 (S113). FIG. 13 shows a working method when the tip of the power cable 1 is inserted into the new insulating cylinder 26. As shown in FIG. 13, the operator inserts the power cable 1 into a new insulating cylinder 26 having a substantially T-shape in appearance. The operator inserts until the hole 28 of the battledore portion 27 of the crimp terminal 25 attached to the tip of the power cable 1 comes to the center 29 of the new type insulating cylinder 26. When the operator inserts the tip of the power cable 1 into the new insulating cylinder 26, the operator cleans the surface of the spacer 21 and applies silicon grease to the surface of the spacer 21 and the inner surface of the new insulating cylinder 26.

<Step 14>
Next, the worker winds the semiconductive fusion tape (S114). The operator has an end portion (about 2 cm) of the new insulating cylinder 26 into which the power cable 1 is inserted, an ACP tape wound around the power cable 1, and an end portion (about 2 cm) of the corrugated 30 of the power cable 1. Wrap semi-conductive fusing tape so that it is covered. The operator wraps the semiconductive fusion tape so as to be reciprocated twice (four layers) by half wrap.

<Step 15>
Next, the worker performs waterproofing treatment (S115). FIG. 14 shows a working method when waterproofing is performed. As shown in FIG. 14, the operator covers the surface of the semiconductive fusion tape wound in S114, winds the waterproof tape in two reciprocations (four layers), and further adhesive polyethylene. The tape 8 is wound by half-wrap 1 reciprocation (2 layers). Thereby, the clearance gap between the power cable 1 and the new type insulation cylinder 26 is completely closed, and insulation performance and waterproof performance are ensured.

<Step 16>
Next, the worker attaches the new connection member 31 to the utility pole 3 (S116). FIG. 14 shows a working method when attaching the new connection member 31 to the utility pole 3. As shown in FIG. 20, the operator uses the stainless steel universal band 6 to lock the adjacent phase power cable connection portion 2 and the like.

<Step 17>
Next, the worker attaches the power cable 1 to the new connection member 31 (S117) (corresponding to the “reconnection process” in the present invention). FIG. 16 shows a working method when the power cable 1 is connected to the new connection member 31. As shown in FIG. 16, the operator fits the new insulating cylinder 26 into the connection terminal 32 of the new connection member 31. Then, the operator fits the connection terminal 32 in the hole 28 of the battledore portion 27 of the crimp terminal 25 in the cylinder of the new insulating cylinder 26. Then, the operator fixes the crimp terminal 25 to the connection terminal 32 with a bolt. Then, the worker performs waterproofing on the new insulating cylinder 26 and attaches a grounding clamp or the like to complete the work. Thus, the repair of the connection portion 2 of the power cable 1 is completed. In addition, in FIG. 17, the connection part 33 of the new electric power cable 1 in which repair work was completed is shown.

  As described above, according to the method for repairing a power cable according to the present embodiment, the existing power cable is not cut and significantly shortened, so that an operation of connecting an extension cable is not necessary. For this reason, it becomes possible to facilitate the replacement work of the connecting portion of the power cable and reduce the construction cost.

  Hereinafter, a power cable repair device 7 according to an embodiment of the present invention will be described. The repair device 7 shown below is the same as that used in the repair method of the power cable 1 according to the first embodiment described above. In addition, it cannot be overemphasized that the repair apparatus 7 which concerns on this invention is not limited to the Example shown below. Moreover, it cannot be overemphasized that the repair method of the electric power cable which concerns on Example 1 mentioned above is not limited only to use of the repair apparatus 7 which concerns on a present Example.

  FIG. 18 shows a modification device 7 for a power cable connecting portion according to an embodiment of the present invention. As shown in FIG. 18, the repair device 7 according to an embodiment of the present invention includes a pressing portion 18, a drive mechanism 16, and a fixing mechanism 14.

  The pressing portion 18 is made of a metal rod and is formed in a size that can be inserted into the inner cylinder of the old insulating cylinder 13. Further, the tip of the pressing portion 18 is formed in a flat shape so that the pressing force is sufficiently transmitted to the tip of the power cable 1. Further, in the pressing portion 18, the cross section of the rod is formed in a circular shape so as to follow the inner peripheral wall surface of the inner cylinder of the old insulating cylinder 13. The pressing portion 18 is connected to the drive mechanism 16, and the portion from the driving mechanism 16 to the tip of the pressing portion 18 is formed of a linear iron rod. Therefore, the pressing part 18 can transmit the pressing force from the drive mechanism 16 to the tip of the pressing part 18.

  The drive mechanism 16 includes a rod-shaped male screw 34 linearly connected to the pressing portion 18 and a female screw 35 into which the male screw 34 is fitted.

  The male screw 34 is made of a long metal rod, and its length is made large enough to push out the power cable 1. The male screw 34 converts rotational motion into linear motion by interaction with the female screw 35, and converts rotational force into pressing force. That is, the male screw 34 is linearly moved by being rotated to generate a pressing force, and drives the pressing portion 18 linearly. The male screw 34 has an operation part 36 having a hexagonal cross section, and a rotational force is applied to the male screw 34 by fitting a ratchet wrench or the like to the operation part 36 and rotating it. The operation unit 36 may be disposed at the tip of the male screw 34.

  The female screw 35 receives a repulsive force from the pressing portion 18 that is generated when the male screw 34 rotates and a driving force is transmitted to the pressing portion 18. The female screw 35 is configured to be connected to the fixing mechanism 14 via the U-shaped member 37, and transmits the repulsive force transmitted from the male screw 34 to the fixing mechanism 14.

The fixing mechanism 14 has a grip portion 38 that grips the outer periphery of the old insulating cylinder 13. The fixing mechanism 14 fixes the drive mechanism 16 to the old insulating cylinder 13 by being fixed by the fixing bolt 15 in a state in which the holding portion 38 holds the outer periphery of the old insulating cylinder 13. As a result, the repulsive force from the power cable 1 generated by rotating the male screw 34 is applied to the old insulating cylinder 13 via the pressing portion 18, the male screw 34, the female screw 35, the U-shaped member 37, and the gripping portion 38. Can be communicated to.

  As described above, according to the repair device 7 according to the present embodiment, the power cable 1 can be easily pushed out from the old insulating cylinder 13 when the connecting portion 2 is repaired. In the present embodiment, the driving mechanism 16 of the refurbishing apparatus 7 is configured to be driven by an operator's operation, but the present invention is not limited to this. That is, in the present invention, the pressing portion 18 may be driven by electric driving or hydraulic driving so as to apply a pressing force to the power cable 1.

The front view which showed the connection part of the power cable. The figure which expanded the cross section of the connection part of an electric power cable. The work flow figure of the repair method of a connection part. The figure which shows the operation | work method at the time of removing a support instrument. The figure which shows the working method at the time of removing a peripheral member. The figure which shows the working method at the time of cut | disconnecting an old type insulation cylinder. The figure which shows the working method at the time of pulling out an electric power cable. The figure which shows the working method at the time of pulling out an electric power cable. The figure which shows the working method at the time of cut | disconnecting a contact part. The figure which shows the operation | work method at the time of peeling off the edge part of an electric power cable. The figure which shows the operation | work method at the time of fitting a spacer. The figure which shows the working method at the time of attaching a crimp terminal. The figure which shows the work method at the time of inserting the front-end | tip of an electric power cable in a new type insulation cylinder. The figure which shows the work method at the time of giving a waterproofing treatment. The figure which shows the working method at the time of attaching a new type connection member to a utility pole. The figure which shows the work method at the time of connecting an electric power cable to a new type connection member. The figure which shows the connection part of the completed new electric power cable. The figure which shows the repair apparatus of the connection part of an electric power cable.

Explanation of symbols

1 ··········· Power cable 2, 33 ···························· Pole 4 ·················· Band saw 5 ············ Cable band 6 ··································· Stainless Band 7 ... Refurbishment device 8 ... Adhesive polyethylene tape 9 ... ..Support bracket 10 ... Peripheral member 11 ... Clamp 12 ... Pipe 13 ... Old type insulation cylinder 14 ... Fixing mechanism 15 ... Fixing bolt 16 ... Drive mechanism 17 ...・ ・ ・ ・ Cutting surface 18 ・ ・ ・ ・ ・ ・ ・ ・ Extruded part 19 ・ ・ ・ ・ ・ ・ ・ ・ End 20 ・ ・ ・ ・ ・ ・ ・ ・.... Contact part 21 ..... Spacer 22 ..... Insulating coating 23 ..... core wire 24 ... Shield layer 25 ... Crimp terminal 26 ... New insulation cylinder 27 ....... Battledore 28 ..... Hole 29 ..... Center 30 ... ······· corrugated 31 ··································································· ······················ 35 ----- operation unit 37 ............. U-shaped member 38 ............. gripper

Claims (3)

The power cable inserted into the opening provided at the end of the cylindrical power cable connecting member is pressed against and gripped by the inner peripheral wall surface in the cylinder to connect the power cable to the connected body. A method of refurbishing the connecting part,
A cutting step of cutting the connection portion so as to intersect with the power cable held in the cylinder of the power cable connection member;
A pressing step of pushing the power cable out of the cylinder by pressing the power cable held in the cylinder of the power cable connecting member from the cut surface side of the cut connection portion;
A new connecting member is attached to the end of the power cable pushed out from the cylinder of the power cable connecting member, and the connecting member is fixed to the connected body, whereby the power cable is again attached to the connected body. A reconnection step of connecting,
How to repair the connection part of the power cable. The connecting portion is configured so that the power cables inserted into openings provided at both ends of the power cable connecting member are connected to each other in a state where the power cables are in contact with each other in a cylinder. The power cables are connected to each other by pressing and gripping the cables on the inner peripheral wall surface in the cylinder,
The cutting step cuts the vicinity of the substantially central portion of the connection portion,
In the reconnection step, each of the power cables is reconnected to each other by attaching the crimp terminals to the end portions of the power cables and connecting the crimp terminals to each other.
The method for repairing a connecting portion of the power cable according to claim 1. The power cable inserted into the opening provided at the end of the cylindrical power cable connecting member is pressed against and gripped by the inner peripheral wall surface of the cylinder to connect the power cable to the connected body. A repair device used when repairing a connected part,
A rod-shaped pressing portion of a size that can be inserted into the cylinder of the power cable connecting member;
The power cable held in the cylinder of the power cable connecting member is pushed out from the cut surface side of the connecting portion cut so as to intersect the power cable held in the cylinder of the power cable connecting member. A driving mechanism that pushes the power cable out of the cylinder by driving the pressing portion in a direction;
A fixing mechanism that fixes the drive mechanism to the power cable connection member so that a pressing force is transmitted to the power cable held in the cylinder of the power cable connection member.
Equipment for repairing power cable connections.

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