JP6570451B2 - Wire tension device and method for replacing overhead ground wire using the same - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension device used when replacing an overhead ground wire passed between utility poles and an overhead ground wire replacement method using the same.

  There is known a method of extending a cable passing between the utility poles 100 by arranging a spiral cable supporter called a spiral hanger 102 along the messenger wire 101 installed between the utility poles 100 and passing through the spiral hanger 102. It has been.

  FIG. 8 shows such a conventional wire drawing method. A messenger wire 101 is stretched between the two power poles 100, and a spiral hanger 102 is disposed so as to be wound around the messenger wire 101 in a spiral shape. As can be seen from FIG. 8, the spiral hanger 102 is wound around the messenger wire 101 with a gap.

  When passing a cable between the utility poles 100, first, the guide wire 103 is passed through the gap between the messenger wire 101 and the spiral hanger 102 described above. At this time, a leading tool 104 is attached to the tip of the guide wire 103 so that the guide wire 103 does not come off the spiral hanger 102. By this leading tool 104, it can progress stably, without removing from the spiral hanger 102.

  In this way, the leading end of the extended cable is connected to the leading end of the guide wire 103 passed between the utility poles 100. And it becomes possible to pass a cable between the utility poles 100 by pulling back the guide wire 103. Such a technique is described in Patent Document 1.

  If the method as described above is used, the cable to be extended can be reliably passed between the utility poles without hanging down, so that the work can be performed safely without interfering with the equipment below. .

JP 2010-233434 A

  An overhead ground wire (GW: ground wire) for the purpose of lightning damage countermeasures is installed at the trunk portion of the high-voltage distribution line and at a branch portion of five or more spans linked to the trunk portion.

  This overhead ground wire is installed at the tip of the overhead ground wire mounting hardware attached to the head of the utility pole. When this overhead ground wire is replaced, a method using the spiral hanger as described above can be used.

  By the way, a high voltage line is installed about 1 meter below the overhead ground line. For this reason, during replacement work due to aging such as rust, work is often performed in a power failure state in consideration of the possibility of interference with surrounding facilities.

  However, in a social situation that relies heavily on today's power, stopping power transmission, even for a short time, will have a significant impact on industry and other fields.

  Therefore, in the present invention, a wire drawing device that improves the efficiency of the wire drawing work, and using this wire drawing device, prevents electrical contact with the high-voltage wire without impairing workability due to use of the spiral hanger. It is an object to provide a method for replacing an overhead ground wire that can be safely performed in Japan.

  In order to achieve the above-mentioned object, the tension device of the present invention includes a slide portion that holds a slide shaft that has a support arm at one end to pivotally support a gripper so as to be slidable in an axial direction. And a clamp portion for fixing the slide portion to the utility pole side.

  In addition to the above-described configuration, the tensioning device of the present invention may be configured such that the support arm is rotatable about the slide shaft and can be locked at a predetermined rotation position. And is attached to the one end of the slide shaft.

  Moreover, the overhead ground wire replacement method of the present invention replaces the old overhead ground wire installed above the high voltage line between the two power poles using the spiral hanger and the tensioning device configured as described above. A method of attaching a support bar substantially horizontally to a height position between the high-voltage line and the old ground wire on one side of the utility pole; and A guide pipe fixing step for fixing the guide pipe to the tip of the fixed support rod so as to hang vertically, and a new overhead ground wire upward from below through the guide pipe fixed in the guide pipe fixing step. To the tip of the guide wire sent from the other side of the power pole through the spiral hanger passed along the old overhead ground wire that has been installed, by the feeding step Lifted A connecting step of connecting the tip of the newly installed overhead ground wire, a stretching step of pulling back the guide wire connected by the connecting step and extending the newly installed overhead ground wire to the other side of the utility pole, and a stretching step. And a tensioning step of fixing the tip of the newly installed overhead ground wire to the other side of the utility pole and applying tension using the tension device on one side of the utility pole.

  As described above, according to the present invention, the gripper is pivotally supported so as to be swingable with respect to the support arm. As a result, the gripper can be folded back and placed on the slide shaft side, so that the gripper can be held in a space-saving manner and the tensioning operation can be performed as it is without operating the slide shaft to approach or interfere with the high-voltage line. be able to.

  Further, according to the present invention, in addition to the above effects, the support arm can be rotated about the slide shaft by the rotation of the rotation unit. Thereby, a clamp part and a slide part can be installed in various attachment angles.

  Further, according to the present invention, in addition to the above effect, when the overhead ground wire is lifted onto the column, the overhead wire is sent through the guide pipe held by the support rod, so that the high pressure is lowered to a position lower than the target height position. Even if wires are installed, electrical contact can be prevented and work can be performed safely.

It is a figure which shows the aerial ground wire replacement | exchange method which concerns on embodiment of this invention. It is a perspective view of the tension device used for the overhead ground wire replacement method of FIG. It is the partially broken perspective view which looked at the wire drawing apparatus of FIG. 2 from another angle. It is an enlarged view of the rotation part of the wire drawing apparatus of FIG. It is a perspective view of the support bar used for the overhead ground wire replacement method of FIG. It is a perspective view of the support pole for the utility pole attachment used for the overhead ground wire replacement | exchange method of FIG. 1, and its attachment seat. It is the reel which sends out the guide wire used for the overhead ground wire replacement | exchange method of FIG. 1, (a) is the perspective view which showed the state which arrange | positioned one side to the table | surface and (b) arranged the other side to the table | surface. It is a figure which shows the conventional cable extending method.

  Hereinafter, an aerial ground wire replacement method according to an embodiment of the present invention and devices used therefor will be described. First, an outline of the overhead ground wire replacement work will be described with reference to FIG. 1, and then peripheral devices will be described with reference to FIG.

  FIG. 1 is a perspective view showing a state around the upper end of a utility pole 50 in the overhead ground wire replacement method according to the embodiment of the present invention.

  In the overhead ground wire replacement method according to the present embodiment, a new overhead ground wire 52 is stretched between two utility poles 50 using a spiral hanger 53. In FIG. 1, the newly installed overhead ground wire 52 is indicated by a one-dot chain line.

  An overhead ground wire fitting 55 is attached to the tip of the utility pole 50, and the old overhead ground wire 51 is stretched on the tip. A high-voltage line 54 is stretched about 1 meter below the former aerial ground line 51.

  Here, such a utility pole adjacent to the utility pole 50 (one side) is not shown, and will be referred to as a utility pole 50a (the other side) for convenience.

  First, the spiral hanger 53 is laid between the utility poles 50 and 50a. The spiral hanger 53 is sent from the power pole 50 side along the old overhead ground wire 51 to the power pole 50a side. Although this operation is performed on a bucket vehicle arranged at the height of the old overhead ground wire 51, illustration is omitted.

  Next, the guide wire 18 (described later with reference to FIG. 7) is sent from the utility pole 50a side to the utility pole 50 side so as to be inserted into the handed spiral hanger 53. In the present embodiment, the spiral hanger 53 is inserted from the utility pole 50 side, and the guide wire 18 is inserted from the utility pole 50a side. Such work is desirable in consideration of work efficiency, but the spiral hanger 53 and the guide wire 18 may be inserted from the same side.

  Next, the support rod 12 is attached to the overhead ground wire attachment hardware 55 (support rod attachment step). Thereby, as shown in FIG. 1, the support bar 12 is disposed at a height position between the high-voltage line 54 and the old overhead ground line 51.

  Following this, the support bar 14 is attached to the utility pole 50 at a position lower than the high-voltage line 54.

  The guide pipe 16 is fixed by the guide pipe holder 12a provided on the upper support bar 12 and the guide pipe holder 14a provided on the lower support bar 14 (guide pipe fixing step). Since the guide pipe 16 is formed of an insulating material, an electric shock can be prevented even if the guide pipe 16 comes into contact with the high-voltage line 54. In the present embodiment, an example in which the upper support rod 12 is attached first is shown, but it may be fixed from below depending on the work environment.

Next, the tip of the newly installed aerial ground wire 52 is sent onto the pillar (lifting process). At this time, the support rod 12
, 14 through the guide pipe 16 fixed to the new overhead ground wire 52 from below to above.

  The tip of the newly installed overhead ground wire 52 that has reached the pole of the utility pole 50 is connected to the tip of the guide wire 18 located on the utility pole 50 side (connection step).

  And the guide wire 18 is pulled back to the electric pole 50a side, and the connected new overhead ground wire 52 is extended to the electric pole 50a (drawing process).

  The tip of the newly installed overhead ground wire 52 that reaches the utility pole 50a is fixed to the utility pole 50a side and lifted up on the utility pole 50 side (stretching step). At this time, as shown in FIG. 1, tension is applied by the wire drawing device 1 attached to the overhead ground wire attachment hardware 55. A grasping device 10 is swingably connected to the wire drawing device 1. The configurations of the tensioning device 1 and the gripper 10 will be described later with reference to FIG.

  As described above, after the newly installed overhead ground wire 52 is stretched, the old overhead ground wire 51 is removed. In the removal work, the old overhead ground wire 51 is lowered to the ground through the guide pipe 16 fixed by the support rods 12 and 14. Thereafter, the tools such as the support rods 12 and 14 and the guide pipe 16 are removed, and the operation is completed.

  Next, devices around the utility pole 50 will be described.

  FIG. 2 is an overall perspective view of the wire drawing device 1 according to the present embodiment. The gripper 10 connected to the wire drawing device 1 is indicated by a dotted line.

  As shown in FIG. 2, the tension device 1 includes a slide portion 2 and a clamp portion 8 that are integrally formed. The slide part 2 is configured to slide the rack 2a provided as a slide shaft in the axial direction.

  A rotating portion 3 is provided at one end of the rack 2a (the rotating portion 3 will be described in detail later with reference to FIG. 4). And the support arm 6 which supports the grasper 10 via the rotation part 3 is provided. The gripper 10 is pivotally supported with respect to the support arm 6 so as to be swingable.

  The slide part 2 and the gripper 10 having such a configuration can be attached to the overhead ground wire attachment hardware 55 by the clamp part 8.

  FIG. 3 is a perspective view seen from the bottom surface side of the wire drawing device 1 of FIG. 2, and is shown partially broken so that the inside of the slide portion 2 can be confirmed. As shown in FIG. 3, the slide mechanism of the wire drawing device 1 is configured by a combination of a rack 2a and a pinion gear 2c. When a rotational force is applied to the input shaft 2b protruding to the outside, the rack 2a can be moved in the axial direction via the worm gear 2d arranged integrally with the pinion gear 2c.

  In this embodiment, an example in which the slide mechanism is configured by the pinion gear and the rack is shown. However, if the slide shaft itself does not rotate, a screw shaft is used instead of the rack 2a. It is also possible to use a nut instead of the gear 2c.

4 is an enlarged perspective view of the periphery of the rotating unit 3 of the wire drawing device 1 of FIG. The rotating part 3 is composed of a fixed part 4 fixed to one end of the rack 2a and a movable part 5 which can move relative to the fixed part 4. In FIG. 4, the movable part 5 is fixed. A state of being separated from the portion 4 in the axial direction is shown. An engaging convex portion 4a is projected from the fixed portion 4 toward the movable portion 5 side. Further, a plurality of engagement recesses 5a that can be engaged with the engagement protrusions 4a are formed on the movable portion 5 side. Specifically, four engagement recesses 5a are formed around the axis with an interval of 90 degrees (predetermined rotation position). Thereby, the movable part 5 side can be locked to an arbitrary rotation position in 90 degree increments with respect to the fixed part 4.

  With such a configuration, the clamp unit 8 cannot be installed as shown in FIG. 1 depending on the work environment, and the gripper 10 can be used for work even if it must be attached in an inclined posture. It is possible to arrange at a suitable position.

  Further, when the rotation is performed 180 degrees, the direction in which the tension is applied can be reversed. Since the work is performed by arranging the bucket from one side of the utility pole 50, the slide portion 2 can always be arranged on the operator side, so that the work efficiency is remarkably improved.

  2 to 4 can be operated by extending the grasping device 10 to a rotational position in a direction away from the rack 2a. However, by arranging the gripper 10 so as to be bent to the rack 2a side, it is compactly gathered, so that the work space can be widely utilized and the gripper 10 can be arranged near the input shaft 2b. Visibility is also improved.

  FIG. 5 is an overall perspective view of the support bar 12 attached to the overhead ground wire fitting 55 in FIG. A clamp portion 12b for holding the overhead ground wire fitting 55 is provided at the tip of the support rod 12. This clamp part 12b is connected with the main body side (bar side) and the universal joint part 12c. As a result, the holding work can be performed at an angle with respect to the main body side, and the working efficiency is improved.

  FIG. 6 is a perspective view showing the support bar 14 attached to the side surface of the utility pole 50 and the support bar mounting seat 20 for fixing the support bar 14 at a position below the high-voltage line 54 in FIG. A hex joint 14 b is provided at the tip of the support bar 14. The hexagonal joint 14b is inserted into a hexagonal hole 20a formed in the support rod mounting seat 20, and can be locked by the plunger 20b. Such a support rod mounting seat 20 is fixed to the utility pole 50 by the belt 20c.

  As shown in FIGS. 5 and 6, in the configuration according to the present embodiment, the guide pipe is fixed by the support rods 12 and 14 at the upper and lower positions of the high-pressure line 54. Space can be maintained, and safety is ensured even in a live line state.

  As described above, in the present embodiment, the configuration in which the support rods 12 and 14 are provided on both the upper and lower sides of the high-voltage line 54 is shown. However, at least the support rod 12 is disposed above the high-voltage line 54, and the work can be performed. The safety will be significantly increased.

  FIG. 7 shows a bucket 56 and a reel 22 installed on the bucket 56. Here, for convenience of explanation, illustration of a structure such as an arm that supports the bucket 56 is omitted.

  The reel 22 can accommodate and feed out the guide wire 18 described in the description of the work procedure using FIG. If the length is between 2 and 3 diameters, the work can be performed by placing it on the bucket 56, so there is no risk of interference with the high-voltage line 54 as described above, and the work efficiency is improved.

The reel 22 shown in FIG. 7 is provided with hooks 24 a and 24 b that can be locked to the bucket 56. The hooks 24 a and 24 b are provided on both sides of the winding portion 26 that accommodates the guide wire 18. Thereby, it is possible to attach to the bucket 56 in either of the hooks 24a and 24b. FIG. 7A shows a state attached by the hook 24a, and FIG. 7B shows a state attached by the hook 24b on the opposite side. Therefore, since the installation state can be selected in accordance with the direction in which the guide wire 18 is desired to be sent out, the working direction can be changed without moving the bucket 56.

1 Tensioning device 2 Slide part 2a Rack (slide shaft)
2b Input shaft 2c Pinion gear 2d Worm gear 3 Rotating part 4 Fixed part 4a Engaging convex part 5 Movable part 5a Engaging concave part 6 Support arm 8 Clamping part 10 Grasping device 12, 14 Supporting rod 12a, 14a Guide pipe holder 12b Clamp Part 12c Universal joint part 14b Hex joint 16 Guide pipe 18 Guide wire 20 Support rod mounting seat 20a Hexagon hole 20b Plunger 20c Belt 22 Reel 24 Frame 24a, 24b Hook 26 Winding part 50, 50a Electric pole 51 Old overhead ground wire 52 Newly installed Overhead ground wire 53 Spiral hanger 54 High voltage wire 55 Overhead ground wire mounting hardware 56 Bucket 100 Telephone pole 101 Messenger wire 102 Spiral hanger 103 Guide wire 104 Leading tool

Claims (3)

A slide portion that has a support arm at one end that pivotally supports the grasper so as to be able to swing;
A tensioning device comprising: a clamp portion for fixing the slide portion to the utility pole side. The support arm is
2. The slide shaft according to claim 1, wherein the slide shaft is attached to the one end of the slide shaft via a rotation portion that can be rotated around the slide shaft and can be locked at a predetermined rotation position. The described tension device. An aerial ground wire replacement method for replacing an old overhead ground wire installed above a high-voltage line between two power poles using a spiral hanger and the tension device according to claim 1,
On one side of the utility pole, at a height position between the high-voltage line and the old overhead ground line, a support bar mounting step for mounting a support bar substantially horizontally;
A guide pipe fixing step of fixing a guide pipe so as to hang vertically in the tip of the support rod fixed in the support rod attaching step;
A feeding step of sending the newly installed overhead ground wire upward from below through the guide pipe fixed in the guide pipe fixing step;
The new aerial site lifted by the lifting process at the tip of a guide wire that is inserted from the other side of the utility pole through the spiral hanger passed along the former aerial ground line. A connecting step for connecting the ends of the wires;
Pulling back the guide wire connected in the connecting step and extending the newly installed overhead ground wire to the other side of the utility pole, and extending the tip of the newly installed overhead ground wire extended in the extending step to the other side of the utility pole An aerial ground wire replacement method comprising: a fixing step of fixing and applying tension using the tension device on one side of the utility pole.