JP3027957U - Close-off device for high voltage transmission tower - Google Patents

Abstract

(57) An object of the present invention is to provide an approach blocking device for a high voltage power transmission tower, which can very easily change the direction of the approach blocking rod and support its mounting. SOLUTION: A support part fixed to a position of a high voltage transmission tower to prevent a person from approaching an overhead power transmission line, a shaft part projecting upward from the support part, and a cross section formed in a substantially circular shape. And an approach blocking rod in which the shaft portion is slidably inserted, and a through hole is formed in the through hole in a direction orthogonal to the longitudinal direction thereof. A flat portion having a substantially square V shape or a substantially square shape attached to the periphery of the blocking rod, the hole through which the shaft portion slidably passes, and the flat portion abutting on the upper surface of the support portion. A flat portion having a lower surface, a coil spring provided around the shaft portion at a position above the flat portion, and provided on the support portion or the flat portion, and the direction of the approach blocking rod is set in a predetermined direction. And a positioning portion for positioning the position.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

 The present invention relates to a high voltage (as will be described in detail later, "high voltage" in this specification includes "extra high voltage"; the same applies below). An access blocking device for preventing access from a transmission tower to an overhead power transmission line. Regarding

[0002]

[Prior art]

 Conventionally, a close-off block bar has been used to prevent the high voltage transmission tower from approaching an overhead power transmission line (see, for example, Japanese Utility Model Publication No. 3-4020 and Japanese Utility Model Publication No. 5-5802). . FIG. 5 is a diagram showing this high-voltage power transmission tower. In FIG. 5, reference numeral 1 is a high-voltage power transmission tower, and 2 is an overhead power transmission line supported by the high-voltage power transmission tower 1. If any abnormality occurs in the overhead power transmission line 2, it is necessary to approach the overhead power transmission line 2 from the high voltage power transmission tower 1 and perform repair work for the overhead power transmission line 2 as shown in FIG. is there. However, since high-voltage electric power is flowing through this overhead power transmission line 2, there is a risk of electric shock accident even if the user approaches without contact. Therefore, an approach blocking device 3 for blocking the approach is provided as shown in FIG. 6 so as not to approach the overhead power transmission line 2 carelessly. In addition, in FIG. 6, 4 is an insulator.

Next, the configuration of the conventionally used approach blocking device 3 will be described with reference to FIG. In FIG. 7, 4 is a support portion fixed to the high voltage power transmission tower 1, 4a is an upper end portion of the support portion 4 having a flat plane, and 4b and 4c are formed at an edge portion of the upper end portion 4a of the support portion 4. The positioning portion 5 is an approach blocking rod having a circular cross section, and 6 is a flat portion attached to the approximate center of the approach blocking rod 5 and having a flat lower surface. In this conventional example, the approach blocking rod 5 has a through hole formed substantially in the center thereof so as to penetrate in the direction perpendicular to the longitudinal direction of the rod 5. Further, a shaft portion 7 is projectingly fixed to the upper end portion 4a of the support portion. A through hole of the approach blocking rod 5 is slidably inserted into the shaft portion 7. Further, at least the upper half of the shaft portion 7 is threaded. A nut 8 is fitted from the upper end of the shaft portion 7.

Next, a method of assembling the approach blocking rod 5 in this conventional example will be described. As shown in FIG. 7, the flat lower surface of the flat portion 6 is brought into contact with the flat upper surface of the upper end portion 4a of the supporting portion 4, and the side surface of the flat portion 6 is positioned as shown in FIG. By contacting the portions 4b and 4c, the approach blocking rod 5 is positioned with respect to the support portion 4. Then, in this state, by fitting and tightening the nut 8 from above the shaft portion 7, the approach blocking rod 5 is firmly attached to and supported by the support portion 4.

Next, a method of using the approach blocking rod 5 in this conventional example will be described. Normally, the approach blocking rod 5 is positioned in a direction substantially parallel to the overhead power transmission line 2 and then attached to the support portion 4 to block the approach to the overhead power transmission line 2. Next, when it is necessary to approach the overhead power transmission line 2 for repair work at the time of power failure, loosen the nut 8 with a tool from the state shown in FIG. Rotate to the direction you want. When the flat bar 6 is placed between the two positioning parts 4b and 4c shown in FIG. Then, using the tool again, the nut 8 is fitted on the shaft portion 7 and tightened to attach the approach blocking rod 5 to the support portion 4. When the repair work at the time of power failure is completed, the nut 8 is loosened again with a tool, and the approach blocking rod 5 is rotated again until it is in a direction substantially parallel to the overhead power transmission line 2. By tightening 8, the access blocking rod 5 is attached and fixed to the support portion 4.

[0006]

[Problems to be solved by the device]

 However, in such a conventional approach blocking device 3, as described above, the approach blocking rod 5 is rotated to change the direction to a direction substantially orthogonal to the overhead power transmission line 2 in order to start repair work or the like. At both the time and when the approach blocking rod 5 is installed to return it to the original direction (direction substantially parallel to the overhead power transmission line) after the completion of repair work, etc., use the tool to remove the nut 8 one by one. There is a problem in that it has to be loosened and tightened, which compels extremely complicated work.

The present invention has been made by paying attention to such problems of the prior art, and therefore, the proximity breaker for a high-voltage power transmission tower can extremely easily change the direction of the approach breaker bar and attach and fix it to the support portion. The purpose is to provide.

[0008]

[Means for Solving the Problems]

 High voltage (including special high voltage; the same applies hereafter) according to the present invention for solving the above problems (claim 1) The high voltage transmission tower access cutoff for blocking people's approach from the overhead transmission line to the overhead transmission line The device consists of a support that is fixed at a position that prevents people from approaching the overhead power transmission line of the high-voltage power transmission tower, and a shaft that projects upward from this support and that has a screw cut in almost the upper half. Is an approach blocking rod having a substantially circular cross section, and a through hole is formed in a direction orthogonal to the longitudinal direction of the rod, and the shaft portion is slidably inserted into the through hole. An approach blocking rod and a flat portion having a substantially square cross section or a substantially square shape attached to the periphery of the approach blocking rod, and a hole through which the shaft portion slidably passes, A flat carrier having a flat lower surface that is in contact with the upper surface of the supporting unit; Coil spring provided around the shaft portion at a position above the shaft portion, a lid portion fixed to the upper end of the coil spring and through which the shaft portion is inserted, and a screw of the shaft portion from above the lid portion. A nut that is inserted into the lid, is moved to a position where the lid is pressed downward against the force of the coil spring, and is fixed at that position, and the nut is provided in the support portion or the flat portion. A positioning portion for positioning the approach blocking rod in a predetermined direction.

Further, the high voltage (including special high voltage. The same applies below) transmission device according to the present invention (claim 2) is a high voltage power transmission tower access blocking device for blocking a person from approaching an overhead power transmission line. A support that is fixed at a position that prevents people from approaching overhead power lines in the tower, has a flat upper surface, and a shaft that protrudes upward from this support and has a screw cut in almost the upper half thereof. And a cross-section having a substantially quadrangular shape or a generally square-shaped cross section, and a through hole is formed in a direction orthogonal to the longitudinal direction thereof. The approach blocking rod, which is slidably inserted, the coil spring provided around the shaft portion above the approach blocking rod, and the upper end of the coil spring, and the shaft portion is inserted therethrough. And the screw on the shaft from above the lid. A nut to be inserted, which is moved to a position where the lid is pressed downward against the force of the coil spring and is fixed at that position, and the nut provided on the support, And a positioning portion for positioning the blocking rod in a predetermined direction.

In the above-mentioned invention of claim 1 or claim 2, the term “high voltage” is referred to in Article 3 (type of voltage, etc.) of “Ministerial Ordinance for Setting Technical Standards for Electrical Equipment” by the Ministry of International Trade and Industry. Used to include both "high voltage" (750 V for DC, 600 V for AC and 7,000 V or less) and "extra high voltage" (more than 7,000 V) Has been done. Further, the meaning of the term "high pressure" is the same throughout the specification.

[0011]

[Embodiment of device]

 In the present invention (the invention of claim 1), one end of the spring is fixed to the shaft portion, and the approach blocking rod is biased toward the support portion by the spring. , As described below, it becomes very easy to change the direction of the approach blocking rod and fix it to the support part.

That is, first, when trying to attach and fix the approach blocking rod to the support portion, the approach blocking rod is positioned by itself, and thereafter, due to the action of the spring, the approach blocking rod naturally moves toward the support portion. It is urged to be attached and fixed. In other words, it is no longer necessary to tighten the nut with a tool, as in the past. Next, when trying to change the direction of this attached and fixed proximity blocking rod, hold the proximity blocking rod and lift it upwards against the force of the spring to rotate the rod. When the hand comes off the approaching blocking rod when it reaches a predetermined position, the spring naturally causes it to be attached and fixed to the supporting portion below it by the force of the spring. Therefore, unlike the conventional case, it is not necessary to take out the tool and loosen or tighten the nut each time the turning is performed to change the direction.

Further, in the present invention (the invention of claim 2), if at least the lower surface of the approach blocking rod is formed flat, the flat lower surface of the approach blocking rod is left as it is (that is, claim 1). It can be attached to the flat upper surface of the supporting portion as it is without interposing the flat portion in the invention. Therefore, in comparison with the invention of claim 1, the flat part is not required, the number of parts of the approach blocking device is reduced, and the device can be simplified and the manufacturing cost can be reduced.

Further, if the approach blocking rod is formed in a rectangular cross section, the lower surface of the proximity blocking rod becomes flat, so that the flat portion in the device of claim 1 is not necessary, and the approach blocking rod is not necessary. Since the blocking bar has a square pole shape, there is an advantage that its manufacture is easy.

[0015]

【Example】

 Example 1. A configuration of an approach blocking device for a high voltage transmission tower according to an embodiment of the present invention will be described. FIG. 1 is a perspective view of the first embodiment, and FIG. 3 is an exploded perspective view thereof. In FIGS. 1 and 3, 14 is a supporting portion fixed to the high-voltage power transmission tower 1 (see FIG. 6), 14a is an upper surface of the supporting portion 14 having a flat plane, and 15 is an approach blocking rod having a circular cross section. Reference numerals 16, 16 are flat portions having a square-shaped cross section, which is fixed to the approximate center of the approaching blocking rod 15 and has at least a lower surface formed flat. Further, 16a is a portion which projects downward from one edge of the flat portion 16 by a predetermined distance m, and is brought into contact with the left edge of the upper surface 14a of the support portion 14 in FIG. It is a positioning portion for positioning the approach blocking rod 15 in relation to the support portion 14.

In the first embodiment, as shown in FIG. 3, a shaft portion 17 is projectingly fixed to approximately the center of the upper surface 14 a of the support portion 14. The shaft portion 17 is threaded on its upper half. Further, the approach blocking rod 15 has a through hole 15a formed at substantially the center thereof so as to penetrate in a direction orthogonal to the longitudinal direction thereof. Further, the flat portion 16 is also formed with a through hole 16b penetrating in the vertical direction in the drawing. Further, in the first embodiment, as shown in FIGS. 1 and 3, a nut 18 fitted in a screw formed on the upper half of the shaft portion 17 is provided. Further, as shown in the drawing, a spring 19 which is inserted through the shaft portion 17 and is interposed between the nut 18 and the approach blocking rod 15 is also provided.

When assembling the first embodiment, as shown in FIG. 3, first, the approach blocking rod 15 is inserted through the opening of the flat portion 16 to position the through holes 15a and 16b. To match. Then, the shaft portion 17 is slidably inserted into these two through holes 15a and 16b. Then, the spring 19 is inserted into the shaft portion 17 protruding from the upper surface of the flat portion 16. Then, the nut 18 is fitted and tightened on the shaft portion 17 while slightly pressing the spring 19 downward from the top of the lid portion 19a fixed to the spring 19 and contracting it. When the nut 18 is fitted and tightened, the spring 19 is in a slightly compressed state. In this state, the spring 19 urges the approach blocking rod 15 downward (in the direction of the support portion 14) in the figure by its repulsive force (elastic force). As described above, the approach blocking device according to the first embodiment is manufactured. The approach blocking device thus manufactured fixes the support portion 14 to the high-voltage power transmission tower 1 in a state where the approach blocking rod 15 is positioned in a direction substantially parallel to the overhead power transmission line 2. As a result, it is attached to the high-voltage power transmission tower 1.

Next, a method of using the first embodiment will be described. Normally, the approach blocking rod 15 is attached in a direction substantially parallel to the overhead power transmission line 2 as described above, whereby the approach from the high voltage power transmission tower to the overhead power transmission line 2 is effectively blocked. Next, the method of use when it is necessary to approach the overhead power transmission line 2 from the high-voltage power transmission tower for repair work on the overhead power transmission line 2 will be described. In this case, the operator holds the approach blocking rod 15 in the state shown in FIG. 1 with both hands and lifts it slightly upward. In this case, the lifting distance may be a distance slightly larger than the distance m (see FIG. 3) in which the positioning portion 16a projects from the lower surface of the flat portion 16. In this way, when the approach blocking bar 15 is lifted, the positioning section 16a comes above the upper surface 14a of the support section 14, so that the approach blocking bar 15 can be freely rotated on the support section 14. Like

Therefore, the operator rotates the access blocking rod 15 in the direction of arrow α in FIG. 1 by approximately 90 degrees. Then, by bringing the positioning portion 16a into contact with the edge portion 14c (see FIG. 3) of the upper surface 14a of the support portion 14, the approach blocking rod 15 is positioned in relation to the support portion 14. That is, the positioning portion 16a contacts the edge portion 14b on the left side in FIG. 3 of the upper surface 14a of the support portion 14 before the approach blocking rod 15 is rotated (when it is in a direction substantially parallel to the overhead power transmission line). Although they were in contact with each other, after the approach blocking rod 15 is rotated (rotated to a direction substantially orthogonal to the overhead power transmission line), the support block 14 is brought into contact with the edge 14c of the upper surface 14a of FIG. The approach blocking bar 15 is positioned at this position. The approach blocking rod 15 thus positioned is urged toward the support portion 14 by the elastic force of the spring 19 and thus held at the above-mentioned position.

As described above, according to the first embodiment, when it is necessary to rotate the proximity blocking rod 15 by about 90 degrees for repair work of the overhead power transmission line, as described above, If the approach blocking rod 15 is slightly lifted against the elastic force of the spring 18, it can be freely rotated. In addition, even when the approach blocking rod 15 is returned to its original position (direction) after repair work is completed, similarly, if the approach blocking rod 15 is slightly lifted up, the approach blocking rod 15 can be easily rotated to the original position (direction). Direction). Therefore, according to the first embodiment, when the approach blocking rod is rotated, the tool is taken out one by one to loosen the nut 8 (see FIG. 7) as before, or when returning to the original position. Since complicated work such as tightening the nut 8 with a tool is not required, there is an effect that the efficiency of repair work on the overhead power transmission line is significantly improved.

Example 2. Next, a second embodiment of the present invention will be described. 2 is a perspective view showing the second embodiment, and FIG. 4 is an exploded perspective view thereof. In these figures, the same parts as those in FIGS. 1 and 3 are designated by the same reference numerals and the description thereof will be omitted. In the second embodiment, as shown in FIGS. 2 and 4, the approach blocking rod 25 has a quadrangular cross section. Therefore, since the lower surface of the approach blocking rod 25 of the second embodiment is flat, the lower surface is left as it is (without attaching the flat portion 16 to the approach blocking rod 15 as in the first embodiment). It can be placed on the upper surface 14 a of the support portion 14.

In addition, in the second embodiment, positioning portions 24a, 24b, 24c, and 24d that project upward from the upper surface 14a by a distance indicated by n in FIG. 4 are provided at four corners of the upper surface 14a of the support portion. It is provided. The approach blocking bar 25 is positioned between the four positioning portions 24a, 24b, 24c, and 24d so that it is positioned only in the direction shown by the arrow A or the arrow B in FIG.

Next, a method of using the second embodiment will be described. Normally, the approach blocking rod 25 is attached in a direction substantially parallel to the overhead power transmission line 2 as described above, whereby the approach from the high voltage power transmission tower 1 to the overhead power transmission line 2 is effectively blocked. . Next, a method of use when it is necessary to approach the overhead transmission line 2 from the high voltage transmission tower 1 for repair work of the overhead transmission line 2 will be described. In this case, the operator holds the approach blocking rod 25 in the state shown in FIG. 2 with both hands and lifts it slightly upward against the force of the spring 19. In this case, the distance for lifting the approach blocking rod 25 from the upper surface 14a of the supporting portion 14 is a distance n (see FIG. 4) at which the positioning portions 24a, 24b, 24c, 24d project upward from the upper surface 14a of the supporting portion 14. The distance should be a little larger than the above. In this way, when the proximity blocking rod 25 is lifted by a distance slightly larger than the distance n, the positioning portions 24a, 24b, 24c, 24d come above the upper surface 14a of the supporting portion 14, so that the approach blocking rod 25 is supported. It becomes possible to freely rotate on the portion 14.

Therefore, the operator rotates the approach blocking rod 25 in the direction of arrow α in FIG. 2 by approximately 90 degrees, and at that position, closes the contact between the positioning portions 24a, 24b, 24c, 24d. By inserting the rod 25, the approach blocking rod 25 is positioned with respect to the support portion 14. The approach blocking rod 25 thus positioned is urged toward the support portion 14 by the elastic force of the spring 19, so that it is held at the position where it is positioned.

As described above, according to the second embodiment, as in the case of the first embodiment, the operation of rotating the approach blocking rod 15 by about 90 degrees for repair work of the overhead power transmission line is extremely performed. It will be easy to do. Furthermore, according to the second embodiment, as described above, since the approach blocking rod 25 is formed in a quadrangular cross section and the lower surface thereof is formed flat, this lower surface is directly mounted on the upper surface 14a of the support portion 14. Can be placed and attached. Therefore, unlike the first embodiment, the flat portion 16 is not needed to attach the approach blocking rod 25 to the support portion 14. Therefore, since the number of parts can be reduced accordingly, the manufacturing cost can be reduced and the device can be simplified.

In the second embodiment, the approach blocking rod 25 has a quadrangular cross section so that the approach blocking rod has a flat lower surface. However, the present invention is not limited to this. Alternatively, for example, a flat lower surface may be formed by linearly cutting only the lower half or one-third of the approaching blocking rod having a circular or polygonal cross section. Even when the flat lower surface is provided in this way, the approach blocking rod has the flat lower surface as in the case of the second embodiment. It is not necessary to use special parts such as the used "flat part", and the number of parts can be reduced.

[0027]

[Effect of device]

 As described above, according to the present invention, when it is necessary to rotate the proximity blocking rod for repair work of the overhead transmission line, the proximity blocking is resisted against the elastic force of the coil spring. If you lift the rod a little, you can rotate it freely. Also, even when returning the approach blocking rod to its original position (direction) after repair work is completed, it can be easily rotated back to its original position (direction) by lifting the approach blocking rod slightly. be able to. Therefore, when rotating the approach blocking rod, you need to take out the tool and loosen the nut as before, or tighten the nut with a tool when returning it to its original position. It becomes unnecessary, and the efficiency of repair work on overhead power lines will be greatly improved.

Further, in the present invention (the invention of claim 2), the lower surface of the approach blocking rod is made flat by a method such as forming the approach blocking rod in a quadrangular cross section. With this structure, since the lower surface of the approach blocking rod has a flat portion, the proximity blocking rod can be supported only by placing the flat lower surface as it is on the flat upper surface of the supporting portion. Can be attached to the section. Therefore, it is not necessary to separately provide a flat part for attaching the approach blocking rod to the support part, which reduces the number of parts, reduces the manufacturing cost, and simplifies the device. Become.

[Brief description of drawings]

FIG. 1 is a perspective view showing an approach breaker for a high voltage transmission tower according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing an approaching and breaking device for a high voltage power transmission tower according to a second embodiment of the present invention.

FIG. 3 is an exploded perspective view of the first embodiment.

FIG. 4 is an exploded perspective view of a second embodiment.

FIG. 5 is a diagram showing a high-voltage power transmission tower.

FIG. 6 is a diagram for explaining a conventional device for blocking access to an overhead power transmission line installed in a high-voltage power transmission tower.

FIG. 7 is a perspective view showing a conventional approach blocking device for a high-voltage power transmission tower.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 High-voltage power transmission tower 2 Overhead power transmission line 14 Support part 14a Upper surface of the support part 15,25 Approach blocking rod 16 Flat part 16a 24a, 24b, 24c, 24d Positioning part 17 Shaft part 15a, 16b, 25a Through hole 18 Nut 19 Coil Spring

Claims (2)

[Scope of utility model registration request] 1. A high-voltage power transmission tower approach-and-break device for blocking access from a high-voltage power transmission tower (including special high-voltage. The same shall apply hereinafter) to the overhead power transmission line, wherein a person connecting the high-voltage power transmission tower to the overhead power transmission line The support part is fixed at a position to prevent the approach, the shaft part projecting upward from this support part and the upper half of which is threaded, and the approach blocking part with a substantially circular cross section. A rod, a through hole is formed in a direction orthogonal to the longitudinal direction thereof, and the shaft portion is slidably inserted into the through hole.
The approach blocking rod, a flat portion having a substantially square V shape or a square shape attached to the periphery of the approach blocking rod, the hole through which the shaft portion slidably passes, and the support portion. A flat portion having a flat lower surface that abuts on the upper surface, a coil spring provided around the shaft portion at a position above the flat portion, and fixed to the upper end of the coil spring, the shaft portion A lid part that is inserted, and a nut that is inserted into the screw of the shaft part from above the lid part, and is moved to a position where the lid part is pressed downward against the force of the coil spring, A high-voltage power transmission tower, comprising: a nut fixed at that position; and a positioning portion that is provided on the support portion or the flat portion and that positions the direction of the approach blocking rod in a predetermined direction. Access blocking device. 2. A high-voltage power transmission tower access approach blocking device for blocking access from a high-voltage power transmission tower (including extra-high voltage; the same applies hereinafter) to the overhead power transmission line, which is a person to the overhead power transmission line of the high-voltage power transmission tower. Fixed to a position that prevents the approach of the support, the support having a flat upper surface, the shaft protruding from the support, and the upper half of which is threaded. The approach blocking rod is formed in a substantially square V shape, and a through hole is formed in a direction orthogonal to the longitudinal direction thereof, and the shaft portion is slidably inserted in the through hole. An approach blocking rod, a coil spring provided above the approach blocking rod around the shaft portion, a lid portion fixed to an upper end of the coil spring, and the shaft portion inserted therethrough; A nut to be inserted into the screw of the shaft portion from above the lid, Part is moved to a position where it is pressed downward against the force of the coil spring and is fixed at that position, and the support part is provided to position the approach blocking rod in a predetermined direction. And a positioning part for the purpose of providing an approach blocking device for a high-voltage power transmission tower.