JP2019068660A - Grounding terminal temporarily placing appliance and hot-line work construction method - Google Patents

Abstract

To provide a grounding terminal temporarily placing appliance and a hot-line work construction method allowing for improvement of safety and work efficiency in hot-line work construction.SOLUTION: A grounding terminal temporarily placing appliance 1 according to the present embodiment comprises: a screw shaft 2; an operation part 3; and a footing plate 4. The screw shaft 2 includes a male screw in an outer circumferential surface. The operation part 3 is fixed to the screw shaft 2, and can be rotated around an axis of the screw shaft 2. The footing plate 4 includes: a footing bolt hole 5; a screw hole 6; and a concave part 19. The footing bolt hole 5 extends to a direction intersecting an axial direction D of the screw shaft 2. The footing bolt hole 5 includes a right side part 10 and a left side part 11 opposite to the right side part 10. The screw hole 6 includes a female screw engaged with the screw shaft 2 in an inner circumferential surface. The screw hole 6 is provided at the right side part 10 or the left side part 11 of the footing bolt hole 5, and the screw shaft 2 can penetrate them. The convex part 19 is provided at the right side part 10 or the left side part 11 where the screw hole 6 is not provided, and at least a part of the convex part 19 is opposite to the screw shaft 2.SELECTED DRAWING: Figure 1

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a ground terminal temporary placement fixture and an indirect hot wire construction method using the same.

  In the work of replacing the transformer attached to the utility pole, it is necessary to ground the underline in order to ensure the safety of the operator. Usually, the underline is branched from the high voltage wire to supply current to the transformer and is connected to the transformer via a high voltage cut out. The procedure for replacing the transformer is as follows.

  The high voltage cut-out placed between the high voltage wire and the transformer is opened, and the current flowing from the high voltage wire (underlined) to the transformer is interrupted by the high voltage cut-out. Cut the underline connecting the high voltage wire and the high voltage cutout. Connect the high voltage cut out and the ground wire attached to the transformer using a grounding short circuit. This ensures that the transformer is grounded, allowing the operator to safely replace the transformer.

  In such a hot-line construction, an indirect hot-line construction method in which the worker does not directly touch the wire is often employed in order to ensure the safety of the worker and shorten the working time. At that time, various instruments are used to improve the workability.

  The apparatus which improves workability | operativity is disclosed by Unexamined-Japanese-Patent No. 2017-22888 (patent document 1), for example.

  The device disclosed in Patent Document 1 is an operating rod temporary fixing device capable of temporarily placing an operating rod used in an indirect hot-line operation on a utility pole. The control rod temporary fixing device includes a base including a hole through which a scaffolding bolt of a power pole passes, and a support portion for supporting the control rod. Pass the hole in the base through the scaffolding bolt, hang the operating rod temporary fixture on the scaffolding bolt, and place the operating rod on the support. The support portion is provided with a slit having a shape that prevents the operating rod from falling off. It is described in patent document 1 that the fall of the workability of an indirect hot-line operation | work is suppressed by this.

Unexamined-Japanese-Patent No. 2017-22888 Japanese Utility Model Publication No. 7-27221

  However, the operating rod temporary fixing device disclosed in Patent Document 1 is merely hooked on the scaffolding bolt and is only hanging. Therefore, the control rod temporary fixing device can rotate around the axis of the scaffold bolt or move in the axial direction of the scaffold bolt. When the operating rod temporary fixing device rotates or moves, the operating rod supported by the operating rod temporary fixing device also moves. Therefore, not only it becomes difficult for the operator to grasp the operating rod, but also there is a risk that the operating rod will fall.

  An object of the present invention is to provide a ground terminal temporary storage device and an indirect hot wire construction method capable of improving safety and workability in indirect hot wire construction.

  The ground terminal temporary placement device of the present embodiment includes a screw shaft, an operation unit, and a scaffolding plate. The screw shaft includes an external thread on the outer peripheral surface. The operating part is fixed to the screw shaft and is rotatable around the axis of the screw shaft. The scaffolding plate includes a scaffolding bolt hole, a screw hole and a recess. The scaffold bolt hole extends in a direction intersecting the axial direction of the screw shaft. The scaffold bolt hole includes a right side and a left side opposite to the right side. The screw hole includes an internal thread on the inner circumferential surface that engages with the screw shaft. The screw hole is provided on the right side or the left side of the scaffold bolt hole, and a screw shaft can be penetrated. The recess is provided on the right side or the left side where the screw hole is not provided, and at least a part thereof is opposed to the screw shaft.

  The indirect hot-line construction method of the present embodiment includes a blocking step, a cutting step, an attaching step, a grounding step, a replacing step, and a connecting step. In the shutoff process, the high voltage cut-out attached to the underline connecting the high voltage wire and the transformer is opened, and the current flowing from the high voltage wire to the transformer is cut off. In the cutting step, after the high pressure cut-out is opened, the underline between the high voltage wire and the high pressure cut out is cut. In the mounting step, after the underline is cut, the above ground terminal temporary placement device to which the underline ground shorting device connected to the ground wire of the transformer is attached is attached to the pole bolt of the utility pole. In the grounding step, after the grounding terminal temporary placement device is attached to the pole bolt of the pole, the underline grounding shorting device attached to the grounding terminal temporary placement device is taken using the insulating operation rod, and the underline grounding shorting device is high voltage cut. Attach to the disconnected underline that is connected to out and ground the disconnected underline and transformer that is connected to the high voltage cut-out. In the replacement step, the transformer is replaced after the step of grounding the underline and the transformer. In the connection step, after the step of replacing the transformer, remove the underline grounding shorting device and cut the underline connected to the high voltage cut-out and the disconnected underline connected to the high voltage wire. And connect.

  ADVANTAGE OF THE INVENTION The earthing terminal temporary placement apparatus and indirect hot wire construction method by this invention can improve safety | security and workability.

FIG. 1 is a perspective view of a ground terminal temporary placement device. FIG. 2 is a cross-sectional view taken along line II-II in FIG. FIG. 3 is an enlarged view of a region A in FIG. FIG. 4 is a side view of the ground terminal temporary placement device. FIG. 5 is a side view showing a wheelie of the ground terminal temporary placement device. FIG. 6 is a front view showing an axial rotation of the scaffold bolt of the ground terminal temporary placement device. FIG. 7 is a perspective view showing a ground terminal temporary placement device with the underline ground shorting device temporarily placed. FIG. 8 is a schematic view showing a utility pole to which a high voltage wire is attached. FIG. 9 is a schematic view showing a cutting step. FIG. 10 is a schematic view showing the grounding step. FIG. 11 is a schematic view showing a general grounding process.

  The ground terminal temporary placement device of the present embodiment includes a screw shaft, an operation unit, and a scaffolding plate. The screw shaft includes an external thread on the outer peripheral surface. The operating part is fixed to the screw shaft and is rotatable around the axis of the screw shaft. The scaffolding plate includes a scaffolding bolt hole, a screw hole and a recess. The scaffold bolt hole extends in a direction intersecting the axial direction of the screw shaft. The scaffold bolt hole includes a right side and a left side opposite to the right side. The screw hole includes an internal thread on the inner circumferential surface that engages with the screw shaft. The screw hole is provided on the right side or the left side of the scaffold bolt hole, and a screw shaft can be penetrated. The recess is provided on the right side or the left side where the screw hole is not provided, and at least a part thereof is opposed to the screw shaft.

  In the ground terminal temporary placement device of the present embodiment, the screw shaft tightens the scaffold bolt from the direction intersecting with the axial direction of the scaffold bolt of the utility pole. Therefore, the ground terminal temporary placement device is simply hooked on the scaffolding bolt and not only hanging but fixed to the scaffolding bolt. Also, the screw shaft engages with the screw hole of the scaffolding plate. Therefore, the fastening torque at the time of fastening the screw shaft is transmitted to the scaffolding plate. When torque is transmitted to the scaffolding plate, the scaffolding plate rotates about the axis of the screw shaft (hereinafter referred to as wheelie). Thus, the clamping of the scaffolding bolt and the wheelies of the scaffolding plate make it possible to fix the scaffolding plate at any angle. Since a member used in indirect hot-line construction is temporarily placed on the scaffolding plate, the scaffolding plate on which the member is placed temporarily can be fixed in parallel with the horizontal direction. As a result, the risk that the temporarily placed member falls is reduced, and the safety of the indirect hot wire construction is improved. In addition, since the part where the member is temporarily placed is parallel to the horizontal direction, the worker can easily take the member, and the workability of the indirect hot wire construction is improved. Also, the scaffold bolt is pressed into the recess by the screw shaft. If the scaffold plate tries to wheely after the scaffold bolt hits the recess, the inclined surface of the recess strikes the scaffold bolt, so the scaffold plate can not wheely. That is, the recess can stop the wheelie of the scaffolding plate. This makes it easier to fix the scaffolding plate at an arbitrary angle (especially horizontal) due to the recess.

  The scaffolding plate preferably comprises a mounting comprising a base provided with a hole for a scaffolding bolt and a side provided with a threaded hole. In this case, the above-described ground terminal temporary placement device further includes a leaf spring disposed between the side surface and the operation portion and disposed outside the screw shaft.

  In this case, it is possible to promote the wheelie of the scaffolding plate by the friction between the end face of the leaf spring and the side surface of the scaffolding plate up to the middle of the fastening process of the screw shaft. At the end of the screw shaft fastening process, the axial force between the screw shaft and the screw hole is strengthened, and the torque given to the scaffold plate is dominated by the screw torque of the screw shaft. As a result, the friction between the end face of the leaf spring and the side surface of the scaffolding plate acts in the direction of suppressing the wheelie of the scaffolding plate, so that the sudden wheelie of the scaffolding plate can be suppressed.

  In the above ground terminal temporary placement device, the scaffolding plate preferably includes a wall provided with a hole for a scaffold bolt, and a floor connected to the wall and bent relative to the wall. In this case, the ground terminal temporary placement device comprises a pin attached to the floor.

  In this case, for example, the underline grounding shorting device is temporarily placed on the pin. When the worker tries to remove the underline ground shorting device using the insulating operation rod, the worker can easily take the underline ground shorting device since the underline ground shorting device is rotatable around the axis of the pin.

  The indirect hot-line construction method of the present embodiment includes a blocking step, a cutting step, an attaching step, a grounding step, a replacing step, and a connecting step. In the shutoff process, the high voltage cut-out attached to the underline connecting the high voltage wire and the transformer is opened, and the current flowing from the high voltage wire to the transformer is cut off. In the cutting step, after the high pressure cut-out is opened, the underline between the high voltage wire and the high pressure cut out is cut. In the mounting step, after the underline is cut, the ground terminal temporary placement device of the present embodiment to which the underline ground shorting device connected to the ground wire of the transformer is attached is attached to the scaffold bolt of the utility pole. In the grounding step, after the grounding terminal temporary placement device is attached to the pole bolt of the pole, the underline grounding shorting device attached to the grounding terminal temporary placement device is taken using the insulating operation rod, and the underline grounding shorting device is high voltage cut. Attach to the disconnected underline that is connected to out and ground the disconnected underline and transformer that is connected to the high voltage cut-out. In the replacement step, the transformer is replaced after the step of grounding the underline and the transformer. In the connection step, after the step of replacing the transformer, remove the underline grounding shorting device and cut the underline connected to the high voltage cut-out and the disconnected underline connected to the high voltage wire. And connect.

  According to the indirect hot-line construction method of the present embodiment, safety and workability are improved because the above-described temporary holding device for the ground terminal is used.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. The same or corresponding parts in the drawings have the same reference characters allotted and description thereof will not be repeated.

[Ground terminal temporary placement equipment]
FIG. 1 is a perspective view of a ground terminal temporary placement device. Referring to FIG. 1, the ground terminal temporary placement device 1 includes a screw shaft 2 (see FIG. 2), an operation unit 3 and a scaffolding plate 4.

[Screw shaft]
FIG. 2 is a cross-sectional view taken along line II-II in FIG. In FIG. 2, a part of the scaffold plate is omitted. Referring to FIG. 2, screw shaft 2 has a cylindrical shape. The screw shaft 2 includes an external thread on the outer peripheral surface.

[Operation]
The operation unit 3 is fixed to the screw shaft 2. The operation unit 3 is rotatable around the axial direction D of the screw shaft 2. That is, the operation unit 3 is rotatable integrally with the screw shaft 2. When the operation unit 3 rotates around the axial direction D of the screw shaft 2, the screw shaft 2 also rotates. The operator rotates the operation unit 3 by the insulating operation rod having a hook tool attached to the tip. The shape of the operation unit 3 is, for example, a ring shape. However, the shape of the operation unit 3 is not limited to this. The shape of the operation unit 3 may be a polygon, an ellipse, or the like. In short, the shape of the operation unit 3 may be any shape that can be operated by the insulating operation rod.

Scaffold plate
Referring to FIG. 1, scaffolding plate 4 includes scaffolding bolt holes 5 and screw holes 6. The scaffold bolt of the utility pole passes through the scaffold bolt hole 5. The scaffold bolt holes 5 extend in a direction intersecting the axial direction D of the screw shaft 2. That is, the scaffold bolt holes 5 have a constant length in the direction intersecting the axial direction D of the screw shaft 2. This is for securing the installation space of the screw hole 6. The extending direction of the scaffold bolt hole 5 may not be parallel to the axial direction D of the screw shaft 2. This is because if the scaffold bolt hole 5 extends in parallel with the axial direction D of the screw shaft 2, the scaffold bolt can not be fixed by the screw shaft 2.

  Preferably, the scaffold bolt holes 5 extend in a direction perpendicular to the axial direction D of the screw shaft 2 and perpendicular to the vertical direction. That is, the scaffold bolt holes 5 preferably extend in the horizontal direction. If the scaffold bolt hole 5 extends in a direction orthogonal to the axial direction D of the screw shaft 2, the scaffold bolt can be firmly fixed by the screw shaft 2. Further, since the scaffold bolt extends in the horizontal direction, the scaffold bolt can be easily passed through the scaffold bolt hole 5 if the scaffold bolt hole 5 extends in the direction perpendicular to the vertical direction.

  With reference to FIG. 2, the shape of the scaffold bolt hole 5 is not particularly limited as long as the scaffold bolt can pass through. However, the shape of the hole 5 for scaffolding bolt is a large circle 7 having a diameter larger than the diameter of the scaffolding bolt head, a small circle 8 having a diameter smaller than the diameter of the scaffolding bolt head, a large circle and a small circle It is preferable to include a parallel portion 9 connecting the circular portion.

  The scaffold bolt hole 5 includes the right side 10 and the left side 11. The left side 11 faces the right side 10. The right side 10 and the left side 11 are separated by a vertical line passing through the center of the scaffold bolt hole 5.

  Screw holes 6 are provided on the right side 10 of the scaffolding bolt holes 5. The screw hole 6 is provided through the right side portion 10. The screw hole 6 includes an internal thread on the inner circumferential surface that engages with the screw shaft 2. The screw shaft 2 can pass through the screw hole 6. As described above, the axial direction D of the screw shaft 2 intersects with the extending direction of the scaffold bolt hole 5. Therefore, the extending direction of the screw hole 6 also intersects with the extending direction of the scaffold bolt hole 5.

  When the operation unit 3 is rotated, the screw shaft 2 is rotated. The male screw of the screw shaft 2 meshes with the female screw of the screw hole 6. Therefore, when the operation unit 3 is rotated, the screw shaft 2 moves in the axial direction D. Thereby, the tip end of the screw shaft 2 can be protruded or drawn from the right side portion 10 of the scaffold bolt hole 5. After passing the scaffolding bolt through the scaffolding bolt hole 5, the screw shaft 2 pushes the scaffolding bolt by rotating the operation part 3, and the scaffolding bolt 18 is sandwiched between the screw shaft 2 and the left side 11 (see FIG. 3). Thereby, the ground terminal temporary placement fixture 1 can be fixed to the scaffold bolt of the utility pole.

[Concave part]
FIG. 3 is an enlarged view of a region A in FIG. Referring to FIG. 3, left side portion 11 of scaffold bolt hole 5 may include a recess 19. The recess 19 is recessed from the left side portion 11. The recess 19 serves to stop the wheelie of the scaffolding plate 4. As described above, when the operation unit is rotated to fix the scaffolding plate 4, the scaffolding plate starts to wheely. When the rotation of the operation unit is continued, the tip end of the screw shaft 2 contacts the scaffold bolt 18 and the scaffold bolt 18 is pressed against the left side portion 11. Under the present circumstances, if the recessed part 19 is provided in the left side part 11, the scaffold volt | bolt 18 will contact the recessed part 19. As shown in FIG. If the rotation of the operating part is continued after the scaffold bolt 18 hits the recess 19, the scaffold plate will try to continue wheeling. However, since the recess 19 includes the inclined surface 20, if the scaffold plate tries to wheely after the scaffold bolt 18 hits the recess 19, the inclined surface 20 contacts the scaffold bolt 18 so that it stops the wheelie of the scaffold plate. it can. This suppresses excessive wheelies and makes it easier to fix the scaffolding plate at an arbitrary angle (especially horizontal). In addition, in the cross section perpendicular | vertical to the extension direction of the screw hole 5, the inclined surface 20 means the surface inclined with respect to the parallel part 9 of a scaffold plate.

  At least a portion of the recess 19 is provided in the region of the left side 11 having the same length as the diameter of the scaffold bolt 18 from the upper end of the scaffold bolt hole 5. When the hole 5 for scaffolding bolt is passed through the scaffolding bolt and the grounding terminal temporary placement device is hung on the scaffolding bolt, the scaffolding bolt 18 contacts the upper end of the hole 5 for scaffolding bolt. Therefore, the scaffold bolt 18 is pressed into the recess 19 when the scaffold bolt 18 is tightened, provided it is provided in the region of the left side 11 having the same length as the diameter of the scaffold bolt 18 from the upper end of the scaffold bolt hole 5. This causes the wheelie of the scaffolding plate to stop at a predetermined angle. The scaffold bolt 18 is pressed against the recess 19 by the screw shaft 2. Therefore, at least a part of the recess 19 against which the scaffold bolt 18 is pressed faces the screw shaft 2.

  The cross-sectional shape of the recess 19 is preferably a circular arc. This is because the scaffold plate will wheely smoothly when the scaffold bolt 18 is pressed into the recess 19. However, the cross-sectional shape of the recess 19 is not limited to this. The cross-sectional shape of the recess 19 may be polygonal.

  Referring to FIG. 1, scaffolding plate 4 includes mounting portion 12, wall portion 13 and floor portion 14.

  Referring to FIG. 2, the mounting portion 12 includes a bottom surface 15 and a side surface 16. The bottom surface 15 is provided with a scaffold bolt hole 5. The side surface 16 is provided with a screw hole 6. More specifically, the screw holes 6 are provided from the right side 10 to the side 16 of the scaffold bolt holes 5. The screw shaft 2 is inserted from the side surface 16 toward the right side portion 10.

  Referring to FIG. 1, wall 13 is integral with floor 14. In the floor portion 14, members used in indirect hot-line construction are temporarily placed. The member used in indirect hot wire construction is, for example, a underlined grounding shorting device. The wall 13 and the floor 14 are made by bending a metal plate. Therefore, the angle between the wall 13 and the floor 14 is less than 180 degrees. In consideration of workability, it is preferable that the angle between the wall portion 13 and the floor portion 14 be 90 degrees.

  Then, the improvement of the safety | security and workability | operativity by the earthing terminal temporary placement instrument of this embodiment is demonstrated.

[Mechanism for improving safety]
FIG. 4 is a side view of the ground terminal temporary placement device. Referring to FIG. 4, after attaching the ground terminal temporary placement fixture 1 to the scaffolding bolt 18 of the electric pole 22, the operator rotates the operation unit 3 using the insulating operation rod.

  Referring to FIG. 2, the tip of screw shaft 2 projects from right side 10 to foot 11 of scaffold bolt hole 5 with rotation of operation unit 3. The tip of the screw shaft 2 contacts the scaffold bolt 18 (see FIG. 3). The scaffold bolt 18 pushed to the tip of the screw shaft 2 contacts the left side portion 11. That is, the scaffold bolt 18 is sandwiched between the tip of the screw shaft 2 and the left side portion 11. After the scaffold bolt 18 contacts the tip end of the screw shaft 2 and the left side portion 11, when the operation part 3 is further rotated, the screw shaft 2 is tightened in the screw hole 6, and axial force is generated in the screw shaft 2 and the screw hole 6. Do.

  As a result, the ground terminal temporary placement device 1 is fixed to the scaffold bolt 18. When the ground terminal temporary placement fixture 1 is fixed, the temporary live placement member to be temporarily placed is stably supported by the ground terminal temporary placement fixture 1. Also, as described below, by fixing the scaffolding plate 4 of the ground terminal temporary placement fixture 1 in a state parallel to the horizontal direction, the risk of the temporarily placed members being reduced is reduced, and the safety of indirect hot wire construction Improves the quality.

[Mechanism to improve workability]
When the operation unit 3 is rotated, the screw shaft 2 is rotated. The external thread of the screw shaft 2 engages with the internal thread of the threaded hole 6 of the scaffolding plate 4. Therefore, the fastening torque of the screw shaft 2 is transmitted to the screw hole 6, that is, the scaffolding plate 4. Thereby, the scaffolding plate 4 can be wheeled.

  FIG. 5 is a side view showing a wheelie of the ground terminal temporary placement device. The broken line in FIG. 5 indicates the position of the grounding terminal temporary placement tool in FIG. 4. In FIG. 5, the alternate long and short dash line indicates the position where the floor portion 14 of the scaffolding plate 4 is raised above the horizontal direction. In addition, the display of the operation part 3 grade | etc., Is abbreviate | omitted in the earthing | grounding terminal temporary storage instrument shown with a broken line and a dashed-dotted line in FIG.

  Referring to FIG. 5, when torque is transmitted to scaffolding plate 4, scaffolding plate 4 will rotate (willie) around the axis of the screw shaft. When the scaffolding plate 4 is wheeled, naturally, the floor portion 14 for temporarily placing the members also is wheeled. As indicated by the broken line, the floor portion 14 does not become horizontal depending on the position of the center of gravity of the ground terminal temporary placement device 1 simply by hanging the ground terminal temporary placement device 1 on the scaffolding bolt 18. Therefore, it is difficult for the worker to take the member temporarily placed on the floor portion 14, and the workability is not high.

  However, as described above, in the ground terminal temporary placement device 1 of the present embodiment, the floor portion 14 of the scaffold plate 4 can be wheeled by rotating the operation portion 3. Therefore, the floor portion 14 can be adjusted to be horizontal, or the position of the floor portion 14 can be made parallel to the scaffold bolt according to the position of the operator. In addition, as shown by the alternate long and short dash line in FIG. 5, it is possible to suppress the floor portion 14 from being excessively wheely and the floor portion 14 to be wheeled beyond the horizontal state. Therefore, the position of the floor portion 14 can be fixed so that the worker can easily take the member, and the workability is improved.

  In short, in the ground terminal temporary placement device of the present embodiment, the screw shaft tightens the scaffold bolt from the direction intersecting the axial direction of the scaffold bolt of the utility pole. The screw shaft engages with the threaded hole in the scaffolding plate. Therefore, the fastening torque at the time of fastening the screw shaft is transmitted to the scaffolding plate. Thus, the scaffolding plate can wheely. Since the members used in indirect hot-line construction are temporarily placed on the scaffolding plate, the wheelie of the scaffolding plate can fix the position of the scaffolding plate so that the worker can easily take the members. In addition, since the recessed portion can control the wheelie of the scaffolding plate, it is possible to horizontally fix the floor of the scaffolding plate on which the member is temporarily placed. As a result, the workability of the indirect live line construction is improved.

  Furthermore, since the ground terminal temporary placement device of the present embodiment is fixed to the scaffold bolt by the screw shaft, not only rotation (willie) viewed from the axial direction of the screw shaft, but also at any angle in the axial direction of the scaffold bolt It can be rotated and fixed.

  FIG. 6 is a front view showing an axial rotation of the scaffold bolt of the ground terminal temporary placement device. The broken line in FIG. 6 shows a state in which the ground terminal temporary placement tool just hangs on the scaffolding bolt 18. Referring to FIG. 6, prior to fixing ground terminal temporary placement fixture 1 to scaffolding bolt 18, ground terminal temporary placement fixture 1 only hangs on scaffolding bolt 18. Therefore, it can rotate around the axial direction of the scaffold bolt 18. Therefore, the ground terminal temporary placement device 1 is rotated to an arbitrary position around the axial direction of the scaffold bolt 18, and the operation portion 3 is rotated by the insulating operation rod 29 in that state to fix the ground terminal temporary placement device 1 to the scaffold bolt 18. In this case, the ground terminal temporary placement device 1 is fixed at an arbitrary position around the scaffold bolt 18 in the axial direction. That is, when viewed from the axial direction of the scaffold bolt 18, the scaffold plate 4 can be fixed by being inclined from the horizontal direction.

  The bucket of the work platform on which the worker is riding is not necessarily at the same height as the ground terminal temporary storage device 1. In this case, when the worker takes the member temporarily placed on the ground terminal temporary placement device 1, the worker needs to take the member at a position higher or lower than himself, and the workability is not high. However, the ground terminal temporary placement device 1 of this embodiment can be fixed by tilting the scaffolding plate 4 from the horizontal direction when viewed from the axial direction of the scaffolding bolt 18. Therefore, the floor 14 of the scaffolding plate 4 on which the members are temporarily placed can be directed to the worker. Thereby, even if the position of the worker is different from the position of the ground terminal temporary storage device 1 in the height direction, the worker can easily take the member, and the workability is further improved.

[Leaf spring]
With reference to FIG. 2, the ground terminal temporary placement device 1 may include a plate spring 17. The leaf spring 17 is disposed outside the screw shaft 2. The plate spring 17 is disposed between the operating portion 3 and the side surface 16 of the mounting portion 12. More specifically, the plate spring 17 is sandwiched between the end surface of the operation portion 3 and the side surface 16 of the mounting portion 12. Therefore, the plate spring 17 does not rotate with the rotation of the operation unit 3.

  When the operation unit 3 is rotated to tighten the scaffold bolt 18, the operation unit 3 is also fixed to the screw shaft 2, so the operation unit 3 also moves in the advancing direction of the screw shaft 2. When the operating portion 3 approaches the side surface 16 of the mounting portion 12, the plate spring 17 is compressed by the operating portion 3 and the side surface 16. When the leaf spring 17 is compressed, a force is applied to the operating portion 3 from the leaf spring 17 by a restoring force. From this state, when the operation unit 3 is further rotated, the plate spring 17 tends to rotate in the same direction as the rotation direction of the operation unit 3 due to the friction between the operation unit 3 and the plate spring 17. On the other hand, the restoring force of the plate spring 17 applies a force also to the side surface 16 of the mounting portion 12. Therefore, if the leaf spring 17 tries to rotate in the same direction as the rotational direction of the operation part 3, the friction between the leaf spring 17 and the side surface 16 causes the plate spring 17 to move to the scaffold plate 4 in the same direction as the rotational part 3. The torque in the direction is given. That is, the torque applied from the leaf spring 17 to the scaffolding plate 4 acts to promote the wheelie of the scaffolding plate 4.

  The number of leaf springs 17 may be one or plural. Preferably, the leaf spring 17 is disposed around the axial direction D of the screw shaft 2.

[pin]
Referring to FIG. 1, the ground terminal temporary placement fixture 1 may be provided with a pin 28. The pins 28 are attached to the floor 14 of the scaffolding plate 4. In the pin 28, a member used in the indirect hot wire construction is temporarily placed.

  FIG. 7 is a perspective view showing a ground terminal temporary placement device with the underline ground shorting device temporarily placed. In FIG. 7, the case where the member temporarily placed is the underline grounding shorting device 21 is shown. In this case, the ground terminal temporary placement device comprises three pins. In general, there are three underlines connecting high voltage wires and high voltage cutouts. Therefore, in order to connect each of the three underlines to the ground line, three underline ground shorting devices 21 are required. The underline ground shorting device 21 is only inserted into the pin. Thus, the underline ground shorting device 21 is rotatable about the axis of the pin. When the operator tries to remove the underline grounding shorting device 21 using the insulating operating rod 29, the underline grounding shorting device 21 is rotatable around the axis of the pin, so that the operator can be in any position. It is easy to take the underline grounding short circuit 21.

  When the ground terminal temporary placement device 1 includes three pins, it is preferable that the three pins be arranged in a direction intersecting the extending direction of the scaffold bolt holes 5. As mentioned above, the underline ground shorting device 21 is rotatable about the axis of the pin. Therefore, when the three pins are arranged in parallel with the direction in which the holes 5 for scaffolding bolts extend, it is easy for one under-line ground shorting device 21 to make contact with the next under-line ground shorting device. Therefore, the rotation angle of the underline ground shorting device 21 is limited. However, if the three pins are aligned in the direction crossing the extending direction of the scaffold bolt holes 5, it is difficult for one under-ground ground shorting device 21 to come into contact with the next under-line ground shorting device. Therefore, the rotation angle of the underline grounding short circuit device 21 becomes wide. This further improves the workability of the worker.

[Indirect live line construction method]
Then, the indirect hot-line construction method using the earthing terminal temporary placement instrument of this embodiment is explained. The indirect hot-line construction method of the present embodiment is a method for replacing a transformer attached to a utility pole.

  The indirect hot-line construction method of the present embodiment includes a blocking step, a cutting step, an attaching step, a grounding step, a replacing step, and a connecting step. Each step will be described below.

[Shutdown process]
FIG. 8 is a schematic view showing a utility pole to which a high voltage wire is attached. Referring to FIG. 8, a high voltage wire 23, a high voltage cutout 24, and a transformer 25 are attached to the utility pole 22. The underline 26 connects the high voltage wire 23 and the transformer 25 in order to supply current to the transformer. A high pressure cut-out 24 is attached to the underline 26. The high voltage cut-out 24 can interrupt the current flowing to the underline 26. Normally, the high voltage cut-out 24 is not open in order to supply current to the transformer 25. However, when replacing the transformer 25, it is necessary to shut off the current flowing to the transformer 25 in order to ensure the safety of the worker. Therefore, in the shutoff process, the high voltage cut-out 24 is opened, and the current flowing from the high voltage wire 23 to the transformer 25 is shut off.

[Cutting process]
FIG. 9 is a schematic view showing a cutting step. Referring to FIG. 9, after the high pressure cut-out 24 is opened, the underline 26 between the high voltage wire 23 and the high pressure cut-out 24 is cut by a cutting tool. Thereby, the underline 26 between the high voltage electric wire 23 and the high voltage cut-out 24 is the underline 26A of the one connected to the high voltage electric wire 23, and the underline 26B of the one connected to the high voltage cutout 24. Divided into

[Installation process]
In the mounting step, the above-described ground terminal temporary placement device 1 is attached to the scaffolding bolt 18 of the electric pole 22. A underline ground shorting device 21 is attached to the ground terminal temporary placement device 1. The underline ground shorting device 21 is connected to the ground wire 27 of the transformer 25. As a result, the underline ground shorting device 21 is grounded together with the transformer 25.

  The underline ground shorting device 21 temporarily placed on the ground terminal temporary placement device 1 is connected to the ground wire 27 in advance before the mounting process. After the cutting process, the operator uses the insulated operating rod 29 to remove the underline grounding shorting device 21 that is already grounded and temporarily placed on the ground terminal temporary placement device 1 (see FIG. 7).

  Here, the effect of using the ground terminal temporary placement fixture 1 described above in the indirect hot-line construction method of the present embodiment will be described.

  Referring to FIG. 9, in the utility pole 22, the high voltage wire 23, the high voltage cutout 24, and the transformer 25 may be disposed in this order from the top. In such a utility pole 22, a worker located below the transformer 25 cuts the underline between the high voltage wire 23 and the high voltage cut-out 24 and connects it to the grounding shorting device 21 using the insulating operating rod. It is difficult. The reason is that since the transformer 25 is between the worker and the high voltage cut-out 24, the insulating operation rod may interfere with the transformer 25. Therefore, conventionally, in such a utility pole, the worker manually opens the high-pressure cut-out 24 by hand manually using an aerial work vehicle, and attaches the grounding shorting device 21 to the high-pressure cut-out 24. Workers wear insulating clothing, high-pressure gloves, etc. There is no problem in safety, but it is more desirable to work indirectly with insulating operating rods.

  Therefore, this problem can be solved by using the above-described temporary holding device for the ground terminal 1. The ground terminal temporary placement device 1 is attached to the scaffold bolt 18. The underline grounding shorting device 21 is temporarily placed on the ground terminal temporary placement device 1. The transformer 25 does not become an obstacle when the worker takes the underline grounding shorting device 21 temporarily placed on the grounding terminal temporary placement device 1 using the insulating operation rod. Because, as described above, the ground terminal temporary placement device 1 can be fixed at any angle (especially horizontal) when viewed from the axial direction of the screw shaft, and at any angle when viewed from the axial direction of the scaffold bolt This is because the ground terminal temporary placement device 1 can be fixed. Therefore, the angle of the ground terminal temporary placement device 1 can be adjusted so that the worker can easily take the member temporarily placed on the ground terminal temporary placement device 1. Therefore, according to the indirect hot-line construction method of the present embodiment, the workability is improved. Furthermore, the safety is further improved because the worker does not have to directly and manually ground the underline.

[Earthing process]
FIG. 10 is a schematic view showing the grounding step. Referring to FIG. 10, in the grounding step, the underline grounding shorting device 21 attached to the ground terminal temporary placement device 1 is taken using the insulating operation rod. The underline ground shorting device 21 is attached to the underline 26 cut in the cutting step. Here, there are two broken underlines 26: underline 26A connected to the high voltage electric wire 23, and underline 26B connected to the high pressure cutout 24. The underline ground shorting device 21 is attached to the disconnected underline 26 B connected to the high pressure cutout 24. As described above, the underline grounding shorting device 21 is previously connected to the ground line of the transformer 25 and is grounded. Thus, the grounding process grounds the underline 26, the high voltage cut-out 24, and the transformer 25. The implementation of such a grounding step can suppress a short circuit of the current. Hereinafter, this point will be described in detail.

  FIG. 11 is a schematic view showing a general grounding process. Referring to FIG. 11, in general, when grounding the underline 26, the high voltage cut-out 24, and the transformer 25, the underline ground shorting device 21 connected to the ground wire 27 of the transformer 25 has a high voltage cut-out 24. Connected directly to After the transformer 25 has been replaced, the disconnected underlines 26A and 26B between the high voltage wire 23 and the high voltage cut-out 24 are reconnected to re-energize the transformer 25.

  However, in such a grounding step, when the current is supplied to the transformer 25 without removing the underline grounding shorting device 21 after the replacement of the transformer 25, a current shown by a broken line in FIG. 11 is generated. As a result, underlining and the like may be shorted.

  Referring to FIG. 10, according to the indirect hot wire construction method of the present embodiment, the underline ground shorting device 21 is not directly connected to the high voltage cut-out 24. The underline ground shorting device 21 is connected to the disconnected underline 26 B which is connected to the high pressure cutout 24. Therefore, in order to connect the disconnected underlines 26A and 26B with each other in order to re-energize the transformer 25, the underline ground shorting device 21 must be removed. For this reason, according to the indirect hot-line construction method of the present embodiment, shorting of underline and the like is suppressed.

[Exchange process]
In the replacement process, the transformer 25 is replaced. Since the replacement process is carried out after the grounding process, workers can safely replace the transformer without an electric shock because it flows to the ground through the grounding wire even if current remains in the transformer. Can.

[Connection process]
In the connection process, the underline grounding shorting device 21 is removed, and the disconnected underline 26B connected to the high-pressure cutout 24 and the disconnected underline 26A connected to the high-voltage wire 23 are connected. Do. The connection step is performed after the replacement step. In short, in the connection step, the underline 26 is returned to the original state. The connection process is performed by a known method using a wire connection tool or the like.

  The embodiment of the present invention has been described above. However, the embodiments described above are merely examples for implementing the present invention. Therefore, the present invention is not limited to the above-described embodiment, and the above-described embodiment can be appropriately modified and implemented without departing from the scope of the invention.

  In the above description, the case where the screw hole is provided on the right side of the scaffold bolt hole 5 has been described. However, a screw hole may be provided on the left side of the scaffold bolt hole 5. In this case, no screw hole is provided on the right side. Also, in this case, the recess is provided on the right side. In short, the left and right of the above-described temporary holding device for the ground terminal may be reversed.

  In the above description, the case where the ground terminal temporary placement fixture includes the attachment portion has been described. However, the ground terminal temporary placement device may not include the mounting portion. The scaffolding plate may be of any shape so that the scaffolding bolt holes and threaded holes are provided.

  In the above description, the case where the ground terminal temporary placement tool includes a pin that enables temporary placement of members has been described. However, the configuration for temporarily placing the members is not limited to the pins. As a configuration for temporarily placing the member, for example, a slit or a hook that can support the member on the floor portion of the scaffolding plate and support it may be provided.

  In the present specification, “crossing” does not mean only the case where a certain direction and a certain direction cross at 90 degrees. A certain direction and a certain direction may intersect at an angle different from 90 degrees. For example, "the hole for scaffold bolt extends in a direction intersecting with the axial direction of the screw shaft" does not mean only when the hole for scaffold bolt extends in a direction orthogonal to the axial direction of the screw shaft. It also includes the case in which the hole for the scaffolding bolt extends obliquely intersecting with the screw shaft.

1: Ground terminal temporary placement device 2: Screw shaft 3: Operation part 4: Scaffold plate 5: Hole for scaffold bolt 6: 6: Screw hole 7: Large circle part 8: Small circle part 9: Parallel part 10: Right side part 11: Left side Part 12: Mounting part 13: Wall part 14: Floor part 15: Bottom face 16: Side 17: Leaf spring 18: Scaffolding bolt 19: Recess 20: Inclined face 21: Underline grounding shorting device 22: Electric pole 23: High voltage electric wire 24: High voltage cut out 25: Transformer 26: Underline 27: Ground wire 28: Pin

Claims (4)

A screw shaft including a male screw on the outer peripheral surface,
An operation unit fixed to the screw shaft and rotatable around the screw shaft;
The scaffold bolt hole includes a scaffold bolt hole extending in a direction intersecting the axial direction of the screw shaft and including a right side portion and a left side portion opposite to the right side portion, and an internal thread meshed with the screw shaft A screw hole which is provided on the right side or the left side and through which the screw shaft can pass, and a recess which is provided on the right side or the left side where the screw hole is not provided And a scaffolding plate. The temporary grounding device according to claim 1, further comprising:
The scaffolding plate includes a mounting portion including a bottom surface provided with the hole for the scaffolding bolt and a side surface provided with the screw hole,
A ground terminal temporary placement device, comprising: a leaf spring disposed between the side surface and the operation portion and disposed outside the screw shaft. It is a ground terminal temporary placement instrument according to claim 1 or claim 2, further,
The scaffolding plate includes a wall provided with the hole for the scaffolding bolt, and a floor connected to the wall and bent relative to the wall;
A ground terminal temporary placement device, comprising: a pin attached to the floor. Opening a high voltage cut-out attached to a underline connecting a high voltage wire and a transformer, and interrupting a current flowing from the high voltage wire to the transformer;
Severing the underline between the high voltage wire and the high voltage cut-out after opening the high voltage cut-out;
The ground terminal temporary storage device according to any one of claims 1 to 3, further comprising a underline ground shorting device connected to the ground wire of the transformer after cutting the underline. Attaching to the scaffold bolt,
After the grounding terminal temporary placement device is attached to the pole bolt of the pole, the underline grounding shorting device attached to the ground terminal temporary placement device is taken using the insulating operation rod, and the underline grounding shorting device is Attaching to the disconnected underline that is connected to a cutout, and grounding the disconnected underline that is connected to the high-voltage cutout and the transformer;
Replacing the transformer after the step of grounding the underline and the transformer;
After the step of replacing the transformer, the underline grounding shorting device is removed, and the one connected to the high voltage wire and the one connected to the high voltage wire and the one connected to the high voltage cut-out And connecting with underlining.

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