Anti-vibration device and method for manufacturing Anti-vibration device

Abstract

To shorten an entire length of an anti-vibration device, and stably maintain an entire power transmission facility including an overhead wire and the anti-vibration device.SOLUTION: An anti-vibration device includes: a pair of first clamps that are spaced apart from each other in an axial direction of an overhead wire and grip the overhead wire; a second clamp that is disposed between the pair of first clamps and grips the overhead wire; a first supplementary wire that is disposed along the overhead wire and is fixed to the overhead line in a slack state by the pair of first clamps; and a second supplementary wire that is disposed along the overhead wire between the overhead wire and the first supplementary wire and is fixed to the overhead wire in the slack state by the pair of first clamps and the second clamp.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to vibration isolation devices and methods for manufacturing vibration isolation devices. [Background technology]

[0002] When wind blows against an overhead wire, Karman vortices are generated downwind of the wire, causing the wire to vibrate. Vibration of the overhead wire can cause fatigue in the wire or wear on metal fittings. For this reason, vibration isolation devices are sometimes attached to overhead wires to suppress vibration of the wire (for example, see Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 58-170313 Summary of the Invention [Problem to be solved by the invention]

[0004] An object of the present disclosure is to shorten the overall length of an anti-vibration device and maintain the stability of the entire power transmission facility including the overhead line and the anti-vibration device. [Means for solving the problem]

[0005] According to one aspect of the present disclosure, there is provided an anti-vibration device comprising: a pair of first clamps arranged at intervals in the axial direction of an overhead wire and gripping the overhead wire; a second clamp arranged between the pair of first clamps and gripping the overhead wire; a first tension wire arranged along the overhead wire and fixed in a slack state relative to the overhead wire by the pair of first clamps; and a second tension wire arranged along the overhead wire between the overhead wire and the first tension wire and fixed in a slack state relative to the overhead wire by the pair of first clamps and the second clamp. [Effects of the Invention]

[0006] According to the present disclosure, the overall length of the vibration isolation device can be shortened, and the entire power transmission facility including the overhead wire and the vibration isolation device can be maintained in a stable state. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic perspective view showing an anti-vibration device according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a schematic cross-sectional view showing the first clamp, the second clamp, and the third clamp. [Figure 3] FIG. 3 is a schematic perspective view showing an anti-vibration device according to a modified example of an embodiment of the present disclosure. [Figure 4A] FIG. 4A is a schematic side view showing the vibration isolation device of Comparative Example 1. FIG. [Figure 4B] FIG. 4B is a schematic side view showing the vibration isolation device of Comparative Example 2. As shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0008] [Description of the embodiments of the present disclosure] <Knowledge gained by the inventors> First, the findings of the inventors will be explained.

[0009] For example, there are cases where overhead lines are installed with high tension over long spans of rivers, straits, etc. In such cases, vibrations with various frequencies are generated in the overhead lines.

[0010] In the past, to suppress the vibrations of overhead wires with various frequencies, a vibration isolation device was installed, which consisted of several splices of different lengths arranged continuously along the overhead wire. Such a vibration isolation device is also called a "Beat damper."

[0011] Conventional vibration isolation devices suppress overhead wire vibrations over a wide frequency range, so the overall length of the device is long. In this case, the process of installing the vibration isolation devices on the overhead wire requires workers to stand on the overhead wire at a high altitude and install multiple tie wires in order over a long distance along the overhead wire. This makes it difficult to ensure safety during the work by the workers. In addition, because the vibration isolation devices extend over a long distance along the overhead wire, it is difficult to manage the installation status of the vibration isolation devices. Furthermore, maintenance such as repairs of the vibration isolation devices is also difficult.

[0012] Therefore, Patent Document 1 discloses an anti-vibration device in which the shorter splice wire is placed inside the longer splice wire (between the long splice wire and the overhead wire). By placing the splice wires in this way, the overall length of the anti-vibration device can be shortened. Patent Document 1 states that this makes it easier for workers to install the anti-vibration device.

[0013] However, when the inventors examined the vibration isolation device of Patent Document 1, they found that the following new problem occurred. Below, the configuration shown in Figure 2 of Patent Document 1 will be described as "Comparative Example 1," and the configuration shown in Figure 4 of Patent Document 1 will be described as "Comparative Example 2."

[0014] (Comparative Example 1) 4A, the vibration-damping device of Comparative Example 1 has a first tension wire 932, a second tension wire 934, a third tension wire 936, and a fourth tension wire 938. The lengths of the first tension wire 932, the second tension wire 934, the third tension wire 936, and the fourth tension wire 938 decrease in this order. The first tension wire 932, the second tension wire 934, the third tension wire 936, and the fourth tension wire 938 are arranged in parallel along the overhead wire 100. As described above, the shorter tension wires are arranged between the longer tension wires and the overhead wire 100.

[0015] In the vibration isolation device of Comparative Example 1, the ends of the first tension wire 932, the second tension wire 934, the third tension wire 936, and the fourth tension wire 938 that are closer to the pylon are fixed to the overhead wire 100 by a common large clamp 922. On the other hand, the ends of the first tension wire 932, the second tension wire 934, the third tension wire 936, and the fourth tension wire 938 that are farther from the pylon are fixed to the overhead wire 100 by individual small clamps 924. With this configuration, vibrations of various frequencies that occur in the overhead wire 100 are suppressed.

[0016] However, in the vibration isolation device of Comparative Example 1, vibrations of various frequencies were concentrated in the common large clamp 922 that fixed the ends of the first tension wire 932, the second tension wire 934, the third tension wire 936, and the fourth tension wire 938. As a result, there was a risk of an overload being applied to the overhead wire 100 at the portion where the large clamp 922 gripped the overhead wire 100.

[0017] Furthermore, in the vibration isolation device of Comparative Example 1, the ends of the first tie wire 932, the second tie wire 934, the third tie wire 936, and the fourth tie wire 938, which were farthest from the steel tower, were fixed close to the overhead wire 100 and at the same distance vertically downward from the overhead wire 100. Therefore, due to the arrangement of the fixed portions, the first tie wire 932, the second tie wire 934, the third tie wire 936, and the fourth tie wire 938 were close to each other. Due to the proximity of these tie wires, there was a possibility that the first tie wire 932, the second tie wire 934, the third tie wire 936, and the fourth tie wire 938 would collide with each other when each tie wire absorbed vibrations. As a result, there was a risk of damage to the first tie wire 932, the second tie wire 934, the third tie wire 936, and the fourth tie wire 938.

[0018] (Comparative Example 2) As shown in FIG. 4B, the vibration-damping device of Comparative Example 2 differs from the vibration-damping device of Comparative Example 1 in the arrangement of the splices.

[0019] In the vibration isolation device of Comparative Example 2, not only the end far from the pylon but also the end close to the pylon of each of the first tension wire 932, second tension wire 934, third tension wire 936, and fourth tension wire 938 are fixed to the overhead wire 100 by individual small clamps 924. The centers of the first tension wire 932, second tension wire 934, third tension wire 936, and fourth tension wire 938 are aligned in the direction along the overhead wire 100. This configuration also suppresses vibrations of various frequencies that occur in the overhead wire 100.

[0020] However, in the vibration-damping device of Comparative Example 2, due to the above-mentioned arrangement, the lowest points of the first tension wire 932, the second tension wire 934, the third tension wire 936, and the fourth tension wire 938 overlap with a gap in the vertical direction. Therefore, for example, when low-frequency vibration occurs in the overhead wire 100, the antinodes of the vibrations of the first tension wire 932, the second tension wire 934, the third tension wire 936, and the fourth tension wire 938 that absorb the vibrations of the overhead wire 100 overlap. Because the antinodes of the vibrations of each tension wire move the largest in the vertical direction, there is a possibility that the first tension wire 932, the second tension wire 934, the third tension wire 936, and the fourth tension wire 938 will collide with each other. As a result, there is a risk of damage to the first tension wire 932, the second tension wire 934, the third tension wire 936, and the fourth tension wire 938.

[0021] As a result of careful consideration by the inventors in addressing the above-mentioned new problems, the inventors discovered a configuration that can shorten the overall length of the vibration isolation device and stably maintain the entire power transmission equipment, including the overhead wires and the vibration isolation device.

[0022] The present disclosure below is based on the above findings made by the inventors.

[0023] <Embodiments of the present disclosure> Next, embodiments of the present disclosure will be listed and described.

[0024] [1] An anti-vibration device according to one aspect of the present disclosure, a pair of first clamps spaced apart in the axial direction of the overhead wire to hold the overhead wire; a second clamp disposed between the pair of first clamps and configured to hold the overhead wire; a first tie wire arranged along the overhead wire and fixed in a loose state relative to the overhead wire by the pair of first clamps; a second tension wire disposed along the overhead wire between the overhead wire and the first tension wire, and fixed in a slack state relative to the overhead wire by the pair of first clamps and the second clamp; Equipped with. According to this configuration, the overall length of the vibration isolation device can be shortened, and the entire power transmission facility including the overhead wire and the vibration isolation device can be maintained in a stable state.

[0025] [2] In the vibration isolation device described in [1] above, the first tension wire is fixed to the overhead wire between the pair of first clamps at a predetermined axial interval in the axial direction of the overhead wire, The second tension wire is fixed to the overhead wire between the pair of first clamps and the second clamp at an axial distance in the axial direction of the overhead wire that is shorter than the axial distance of the first tension wire. According to this configuration, the second attachment wire can suppress vibration of the overhead wire at a frequency higher than the frequency at which the first attachment wire resonates.

[0026] [3] In the vibration isolation device according to [1] or [2] above, The lowest point at which the first slackened extension wire is located and the lowest point at which the second slackened extension wire is located are offset from each other in the axial direction of the imaginary wire. According to this configuration, it is possible to prevent the antinodes of vibration from overlapping in the first and second attachment wires.

[0027] [4] In the vibration isolation device according to any one of [1] to [3] above, the first tension wire is fixed to each of the pair of first clamps at a position vertically downward from the overhead wire by a first vertical distance, The second tie wire is fixed in each of the pair of first clamps and second clamps at a position vertically downward from the overhead wire at a second vertical distance that is shorter than the first vertical distance. According to this configuration, it is possible to prevent the first and second fixing wires from colliding with each other.

[0028] [5] In the vibration isolation device according to any one of [1] to [4] above, a plurality of third clamps disposed between the pair of first clamps and the pair of second clamps and configured to hold the overhead wire; a third tension wire that is disposed along the overhead wire between the overhead wire and the second tension wire, and is fixed in a slack state relative to the overhead wire by the pair of first clamps, the second clamp, and the plurality of third clamps; Further provided are: According to this configuration, the third tie wire can also suppress vibration of the overhead wire.

[0029] [6] A method for manufacturing an anti-vibration device according to another aspect of the present disclosure includes: a step of disposing a pair of first clamps that grip an overhead wire at intervals in an axial direction of the overhead wire; placing a second clamp that grips the overhead wire between the pair of first clamps; a step of placing a first tension wire along the overhead wire and fixing the first tension wire in a slack state relative to the overhead wire using the pair of first clamps; a step of placing a second tension wire along the overhead wire between the overhead wire and the first tension wire, and fixing the second tension wire in a slack state relative to the overhead wire using the pair of first clamps and the second clamp; Equipped with. According to this configuration, the overall length of the vibration isolation device can be shortened, and the entire power transmission facility including the overhead wire and the vibration isolation device can be maintained in a stable state.

[0030] [Details of the embodiments of the present disclosure] Next, one embodiment of the present disclosure will be described below with reference to the drawings. Note that the present disclosure is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope of the claims.

[0031] <One embodiment of the present disclosure> (1) Vibration isolation device The vibration isolation device 10 according to this embodiment will be described with reference to Figures 1 and 2. In Figure 1, for example, the left side is closer to the pylon and the right side is farther from the pylon. In Figure 2, (a), (b), and (c) show cross sections of the first clamp 220, the second clamp 240, and the third clamp 260, respectively. In Figure 2, the bolts 226, 246, and 266 are shown in side views.

[0032] Hereinafter, the "axial direction" of the overhead wire 100 refers to the direction along the central axis of the overhead wire 100, and in some cases may be referred to as the "longitudinal direction." The "radial direction" of the overhead wire 100 refers to the direction from the central axis of the overhead wire 100 toward the outer periphery, and in some cases may be referred to as the "transverse direction." The same terms as those for the overhead wire 100 are used for each of the drain wires 300.

[0033] 1 and 2, the vibration-damping device 10 according to this embodiment includes, for example, a first clamp 220, a second clamp 240, a third clamp 260, a first tie wire 320, a second tie wire 340, and a third tie wire 360. Hereinafter, the first clamp 220, the second clamp 240, and the third clamp 260, and the first tie wire 320, the second tie wire 340, and the third tie wire 360 ​​may be collectively referred to as "clamps 200" and "tie wires 300," respectively.

[0034] (overhead line) The overhead wire 100 to which the vibration isolation device 10 of this embodiment is attached is, for example, an overhead ground wire or an overhead power transmission line. An armor rod (not shown) that protects the overhead wire 100 is provided at the portion where the first clamp 220 and the like are attached, for example, so as to cover the outer periphery of the overhead wire 100.

[0035] (First clamp) For example, a pair of first clamps 220 are provided. The pair of first clamps 220 are arranged, for example, at an interval (axial interval L1, described later) in the axial direction of the overhead wire 100. Each of the pair of first clamps 220 is configured to grip the overhead wire 100 and to fix a portion of each of the first lay wire 320, second lay wire 340, and third lay wire 360 ​​to the overhead wire 100.

[0036] Specifically, the first clamp 220 includes, for example, a support portion 222, a grip portion 224, and a bolt 226.

[0037] The support portion 222 is configured, for example, as a long plate-like member (rod-like member) and is arranged in the vertical direction so as to intersect with the overhead wire 100. The support portion 222 has, for example, four recesses (reference numerals not shown) in which the overhead wire 100 covered by the armor rod, the third attachment wire 360, the second attachment wire 340, and the first attachment wire 320 fit, in this order, along the longitudinal direction of the support portion 222. The four recesses are arranged at predetermined intervals along the longitudinal direction of the support portion 222.

[0038] For example, four gripping portions 224 are provided. Each of the four gripping portions 224 has a recess (reference numeral not shown) into which the overhead wire 100, the third tension wire 360, the second tension wire 340, and the first tension wire 320, which are covered by the armor rod, fit. Each of the four gripping portions 224 is fastened to the support portion 222 by a bolt 226, with the overhead wire 100, the third tension wire 360, the second tension wire 340, and the first tension wire 320 sandwiched between itself and the support portion 222. In this way, the four gripping portions 224 are configured to grip the overhead wire 100, the third tension wire 360, the second tension wire 340, and the first tension wire 320, respectively.

[0039] (Second clamp) For example, one second clamp 240 is provided. The second clamp 240 is disposed, for example, between the pair of first clamps 220. The second clamp 240 is configured to grip the overhead wire 100 and to fix a portion of each of the second tie wire 340 and the third tie wire 360 ​​to the overhead wire 100.

[0040] Specifically, the second clamp 240 has, for example, a support portion 242, a gripping portion 244, and a bolt 246. The second clamp 240 is configured similarly to the first clamp 220, except that, for example, the support portion 242 is shorter than the support portion 222 of the first clamp 220, and the second clamp 240 does not have a gripping portion that grips the first tie wire 320.

[0041] (Third clamp) For example, a plurality (a pair) of third clamps 260 are provided. Each of the pair of third clamps 260 is disposed, for example, between the pair of first clamp 220 and second clamp 240. Each of the pair of third clamps 260 is configured to grip the overhead wire 100 and fix a portion of the third tie wire 360 ​​to the overhead wire 100.

[0042] Specifically, the third clamp 260 has, for example, a support portion 262, a gripping portion 264, and a bolt 266. The third clamp 260 is configured similarly to the first clamp 220 and the second clamp 240, except that, for example, the support portion 262 is shorter than the support portion 242 of the second clamp 240, and the third clamp 260 does not have gripping portions that grip the first attachment wire 320 and the second attachment wire 340.

[0043] (extension line) The first tie wire 320, the second tie wire 340, and the third tie wire 360 ​​are, for example, arranged in parallel along the overhead wire 100. Each of the first tie wire 320, the second tie wire 340, and the third tie wire 360 ​​has, for example, a plurality of strands (numbers not shown) twisted together in a spiral shape. Examples of each tie wire 300 include aluminum-coated steel wire or galvanized steel wire. The diameter of the strands, the number of strands, the overall diameter of the tie wire 300, and the material of the strands of the first tie wire 320, the second tie wire 340, and the third tie wire 360 ​​can be adjusted according to the resonating frequency, and may be the same or different.

[0044] (First Attachment) As described above, the first tension wire 320 is arranged along the overhead wire 100. A first axial end of the first tension wire 320 and a second axial end opposite the first end of the first tension wire 320 are fixed to the first clamp 220 closer to the pylon and the first clamp 220 farther from the pylon, respectively. As a result, the first tension wire 320 is fixed in a catenary-like slack state relative to the overhead wire 100 by the pair of first clamps 220.

[0045] When vibrations of a predetermined frequency occur in the overhead wire 100, the first tension wire 320 resonates, and the multiple wires in the first tension wire 320 generate heat due to friction with each other. This allows the vibration energy of the overhead wire 100 to be converted into thermal energy by the first tension wire 320, and the thermal energy can be consumed (dissipated to the outside). As a result, vibrations of the overhead wire 100 can be suppressed.

[0046] The first tension wire 320 is fixed to the overhead wire 100, for example, between a pair of first clamps 220, at a predetermined axial distance L1 in the axial direction of the overhead wire 100. As a result, the first tension wire 320 is configured to resonate at a predetermined frequency according to the loop length (curve length, catenary length) of the first tension wire 320 slackened in the axial direction of the overhead wire 100 at the axial distance L1.

[0047] Here, the frequency f at which the splice 300 resonates is calculated by the following formula.

[0048]

number

[0049] where: f: natural frequency of the splice 300 (Hz), l: loop length (m) of the slackened splice wire 300 at a predetermined axial interval in the axial direction of the overhead wire 100, EI: Bending stiffness of 300mm splice wire (N·m 2 ), w: weight per unit length of splice wire 300 (N / m), g: acceleration of gravity (m / s 2 ), i: positive integer (1, 2, 3, etc.) is.

[0050] In reality, each splice 300 resonates in a certain frequency band that includes the resonance frequency calculated by the above formula.

[0051] 2, the first tension wire 320 is fixed, for example, in each of the pair of first clamps 220 at a position spaced vertically downward from the overhead wire 100 by a first vertical distance D1. Here, the first vertical distance D1, as well as a second vertical distance D2 and a third vertical distance D3 described below, are the distances from the central axis of the overhead wire 100 to the central axes of the tension wires 300. The above-mentioned first vertical distance D1 is related to the distances by which the first tension wire 320 is vertically separated from a second tension wire 340 and a third tension wire 360 ​​described below.

[0052] (Second siding) The second tie wire 340 is arranged, for example, between the overhead wire 100 and the first tie wire 320 and along the overhead wire 100. The second tie wire 340 is fixed in a slack state to the overhead wire 100, for example, by a pair of a first clamp 220 and a second clamp 240, i.e., at three locations. As a result, the second tie wire 340 forms a pair of loops defined by the pair of the first clamp 220 and the second clamp 240.

[0053] In this embodiment, the second attachment wire 340 is divided into, for example, two attachment wires 300. Specifically, the second attachment wire 340 includes, for example, a 2-1 attachment wire 342 and a 2-2 attachment wire 344. A first axial end of the 2-1 attachment wire 342 and a second end opposite the first end of the 2-1 attachment wire 342 are fixed to the first clamp 220 and the second clamp 240, respectively, which are close to the pylon. The second end of the 2-1 attachment wire 342 is connected to the first axial end of the 2-2 attachment wire 344 by the second clamp 240. A first axial end of the 2-2 attachment wire 344 and a second end opposite the first end of the 2-2 attachment wire 344 are fixed to the second clamp 240 and the first clamp 220, which is far from the pylon, respectively.

[0054] In this embodiment, the second tension wire 340 is fixed to the overhead wire 100, for example, between a pair of first clamps 220 and second clamps 240, at an axial distance in the axial direction of the overhead wire 100 that is shorter than the axial distance L1 of the first tension wires 320. Specifically, the 2-1 tension wire 342 and the 2-2 tension wire 344 are fixed to the overhead wire 100, for example, at axial distances L21 and L22, respectively, in the axial direction of the overhead wire 100. The axial distances L21 and L22 are both shorter than the axial distance L1 of the first tension wire 320. This allows the 2-1 tension wire 342 and the 2-2 tension wire 344 to suppress vibration of the overhead wire 100 at frequencies higher than the frequency at which the first tension wire 320 resonates.

[0055] In this embodiment, the pair of loops in the second tie wire 340 are fixed to the overhead wire 100 at different axial intervals in the axial direction of the overhead wire 100, and are configured so that their resonant frequency bands partially overlap. In other words, in the axial direction of the overhead wire 100, the axial interval L21 at which the 2-1 tie wire 342 is fixed and the axial interval L22 at which the 2-2 tie wire 344 is fixed are different from each other within a range in which the resonant frequency band of the 2-1 tie wire 342 and the resonant frequency band of the 2-2 tie wire 344 partially overlap each other. This makes it possible to prevent the occurrence of a frequency band in which vibration of the overhead wire 100 cannot be suppressed, among the frequency bands in which the pair of loops in the second tie wire 340 resonate. As a result, the second tie wire 340 can suppress vibration of the overhead wire 100 over a wide frequency band.

[0056] In this embodiment, the second attachment wire 340 is fixed to the overhead wire 100 by the second clamp 240 between the pair of first clamps 220 as described above, so that the lowest point at which the first attachment wire 320 is loosened and the lowest point at which the second attachment wire 340 is loosened (the lowest points of the 2-1 attachment wire 342 and the 2-2 attachment wire 344) are offset in the axial direction of the overhead wire 100. This makes it possible to prevent the vibration antinodes of the first attachment wire 320 and the second attachment wire 340 from overlapping.

[0057] 2, in this embodiment, the second tie wire 340 is fixed in each of the pair of first clamp 220 and second clamp 240 at a position spaced vertically downward from the overhead wire 100 by a second vertical distance D2 that is shorter than the first vertical distance D1. The second vertical distance D2 is set, for example, so that the lowest point of the second tie wire 340 in a stationary state does not come into contact with the first tie wire 320. This ensures that the second tie wire 340 is spaced reliably away from the first tie wire 320 even if at least one of the first tie wire 320 and the second tie wire 340 resonates in conjunction with vibration of the overhead wire 100.

[0058] (Third Attachment) The third tie wire 360 ​​is arranged, for example, between the overhead wire 100 and the second tie wire 340 and along the overhead wire 100. The third tie wire 360 ​​is fixed in a slack state to the overhead wire 100 at five locations, for example, by a pair of first clamps 220, second clamps 240, and a plurality of third clamps 260. As a result, the third tie wire 360 ​​forms four loops defined by the pair of first clamps 220, second clamps 240, and a plurality of third clamps 260.

[0059] In this embodiment, the third attachment wire 360 ​​is divided into, for example, four attachment wires 300. Specifically, the third attachment wire 360 ​​includes, for example, a 3-1 attachment wire 362, a 3-2 attachment wire 364, a 3-3 attachment wire 366, and a 3-4 attachment wire 368. A first axial end of the 3-1 attachment wire 362 and a second end opposite the first end of the 3-1 attachment wire 362 are fixed to the first clamp 220 close to the pylon and the third clamp 260 close to the pylon, respectively. The second end of the 3-1 attachment wire 362 is connected to the first axial end of the 3-2 attachment wire 364 by the third clamp 260 close to the pylon. A first axial end of the 3-2 attachment wire 364 and a second end opposite the first end of the 3-2 attachment wire 364 are fixed to the third clamp 260, which is close to the pylon, and the second clamp 240, respectively. The second end of the 3-2 attachment wire 364 is connected to the first axial end of the 3-3 attachment wire 366 by the second clamp 240. The 3-3 attachment wire 366 and the 3-4 attachment wire 368 are fixed to the overhead wire 100 in a configuration that is symmetrical to the 3-2 attachment wire 364 and the 3-1 attachment wire 362, with the second clamp 240 as the center line, except that their axial spacing along the axial direction of the overhead wire 100 is different from each other, as will be described later.

[0060] In this embodiment, the third tension wires 360 are fixed to the overhead wire 100, for example, between a pair of first clamps 220, second clamps 240, and multiple third clamps 260, at axial intervals that are shorter than the axial intervals (L21, L22) of the second tension wires 340 in the axial direction of the overhead wire 100. Specifically, the 3-1 tension wire 362, the 3-2 tension wire 364, the 3-3 tension wire 366, and the 3-4 tension wire 368 are fixed to the overhead wire 100 at axial intervals L31, L32, L33, and L34, respectively, in the axial direction of the overhead wire 100. The axial intervals L31, L32, L33, and L34 are each shorter than the axial interval L21 of the 2-1 tension wire 342 and the axial interval L22 of the 2-2 tension wire 344. As a result, the 3-1 attachment wire 362, the 3-2 attachment wire 364, the 3-3 attachment wire 366 and the 3-4 attachment wire 368 can suppress vibrations of the overhead wire 100 at frequencies higher than the frequency at which the second attachment wire 340 resonates.

[0061] In this embodiment, the four loops of the third tie wire 360 ​​are fixed to the overhead wire 100 at different axial intervals in the axial direction of the overhead wire 100, and are configured so that their resonant frequency bands partially overlap. This makes it possible to prevent the occurrence of a frequency band in which vibration of the overhead wire 100 cannot be suppressed, among the frequency bands in which the four loops of the third tie wire 360 ​​resonate. As a result, the third tie wire 360 ​​can suppress vibration of the overhead wire 100 over a wide frequency band.

[0062] In this embodiment, the lowest point at which the third extension wire 360 ​​is slackened (the lowest points of the 3-1 extension wire 362, the 3-2 extension wire 364, the 3-3 extension wire 366, and the 3-4 extension wire 368) is shifted in the axial direction of the overhead wire 100 from the lowest point at which the first extension wire 320 is slackened and the lowest point at which the second extension wire 340 is slackened. This makes it possible to prevent the antinodes of vibration in the first extension wire 320, the second extension wire 340, and the third extension wire 360 ​​from overlapping.

[0063] 2, in this embodiment, the third tie wire 360 ​​is fixed at a position vertically downwardly spaced a third vertical distance D3, which is shorter than the second vertical distance D2, in each of the pair of first clamps 220, second clamps 240, and multiple third clamps 260. The third vertical distance D3 is set, for example, so that the lowest point of the third tie wire 360 ​​in a stationary state does not come into contact with the second tie wire 340. This ensures that the third tie wire 360 ​​is reliably separated from the second tie wire 340 even if at least one of the second tie wire 340 and the third tie wire 360 ​​resonates in conjunction with vibration of the overhead wire 100.

[0064] As the first, second, and third tie wires 320, 340, and 360 resonate, the wires in each tie wire 300 rub against each other, generating frictional heat. This converts vibration energy into thermal energy. As a result, vibration of the overhead wire 100 can be efficiently suppressed.

[0065] (2) Manufacturing method of vibration isolation device (mounting method of vibration isolation device) The manufacturing method of the vibration-damping device 10 of this embodiment includes, for example, a clamp placement step S10 and a splice wire fixing step S20.

[0066] (S10: Clamp placement process) First, a worker moves from the tower onto the overhead wire 100. Once the worker is on the overhead wire 100, the worker performs the following operations.

[0067] The first clamp 220, the third clamp 260, the second clamp 240, the third clamp 260, and the first clamp 220 that grip the overhead wire 100 are arranged, for example, in this order, starting from a position closest to the pylon and moving in the opposite direction, at a predetermined axial interval in the axial direction of the overhead wire 100. The order in which the clamps 200 are attached is not limited to the above-mentioned order, and the order may be reversed.

[0068] (S20: Wire fixing process) When the clamp placement step S10 is completed, the first attachment wire 320 is placed along the overhead wire 100, and the first attachment wire 320 is fixed in a slack state relative to the overhead wire 100 by the pair of first clamps 220.

[0069] After the first attachment wire 320 is fixed to the overhead wire 100, the second attachment wire 340 is placed along the overhead wire 100 between the overhead wire 100 and the first attachment wire 320, and the second attachment wire 340 is fixed in a slack state relative to the overhead wire 100 using a pair of first clamps 220 and second clamps 240.

[0070] After the second tension wire 340 is fixed to the overhead wire 100, the third tension wire 360 ​​is placed along the overhead wire 100 between the overhead wire 100 and the second tension wire 340, and the third tension wire 360 ​​is fixed in a slack state relative to the overhead wire 100 using a pair of first clamps 220, a second clamp 240 and multiple third clamps 260.

[0071] The order in which the respective tie wires 300 are fixed to the overhead wire 100 is not limited to the above-mentioned order, and the order may be reversed.

[0072] In this manner, the vibration isolation device 10 of this embodiment is manufactured.

[0073] (3) Summary of this embodiment According to this embodiment, one or more of the following effects are achieved.

[0074] (a) In this embodiment, the first tension wire 320, the second tension wire 340, and the third tension wire 360 ​​are arranged in parallel along the overhead wire 100. The axial distances between the first tension wire 320, the second tension wire 340, and the third tension wire 360 ​​in the axial direction of the overhead wire 100, which are fixed in a catenary-like slack state, become shorter in this order. That is, in each tension wire 300 of this embodiment, multiple loops formed with different lengths are concentrated in the area between the pair of first clamps 220.

[0075] As described above, in this embodiment, the vibration isolation device 10 is configured to be able to suppress vibrations of various frequencies using each tie wire 300, and the overall length of the vibration isolation device 10 can be shortened. This makes it easier for workers to perform their work, and makes it easier to ensure safety during work by workers. It also makes it easier to manage the installation status of the vibration isolation device 10. Furthermore, it also makes it easier to perform maintenance such as repairs on the vibration isolation device 10.

[0076] (b) In this embodiment, the second tie wire 340 is fixed to the overhead wire 100 at three locations, including the pair of first clamps 220 and the second clamp 240. Furthermore, the third tie wire 360 ​​is fixed to the overhead wire 100 at five locations, including the pair of first clamps 220 and the second clamp 240 and the plurality of third clamps 260. In this way, by fixing the second tie wire 340 and the third tie wire 360 ​​included in the vibration-damping device 10 to the overhead wire 100 at multiple locations, even if vibrations of various frequencies occur in the overhead wire 100, the vibrations (stresses) can be dispersed among the multiple clamps 200. By dispersing the vibrations, it is possible to prevent vibrations of various frequencies from concentrating on the clamps 200 (particularly the first clamp 220) common to each tie wire 300. This prevents excessive loads from being applied to the portions of the clamps 200 common to each tie wire 300 that grip the overhead wire 100. As a result, it is possible to prevent damage to the overhead wire 100 due to an overload on the overhead wire 100.

[0077] (c) In this embodiment, due to the above-described fixed arrangement of the first tenon wire 320, the second tenon wire 340, and the third tenon wire 360, the lowest point at which the first tenon wire 320 is loosened, the lowest point at which the second tenon wire 340 is loosened (the lowest point of each of the 2-1 tenon wire 342 and the 2-2 tenon wire 344), and the lowest point at which the third tenon wire 360 ​​is loosened (the lowest point of each of the 3-1 tenon wire 362, the 3-2 tenon wire 364, and the 3-3 tenon wire 366) are offset from one another in the axial direction of the overhead wire 100. As a result, even if low-frequency vibration occurs in the overhead wire 100, for example, it is possible to prevent the antinodes of vibration from overlapping in the first tenon wire 320, the second tenon wire 340, and the third tenon wire 360. Preventing these antinodes of vibration from overlapping can suppress collisions between the first tenon wire 320, the second tenon wire 340, and the third tenon wire 360. As a result, damage to each of the splices 300 included in the vibration isolation device 10 can be suppressed.

[0078] As described above in (a) to (c), in this embodiment, it is possible to shorten the overall length of the vibration isolation device 10, while maintaining the stability of the entire power transmission facility including the overhead wire 100 and the vibration isolation device 10.

[0079] (d) In this embodiment, at least any two of the first tacking wire 320 , the second tacking wire 340 , and the third tacking wire 360 ​​are fixed to the overhead wire 100 by a common clamp 200 .

[0080] In the above-mentioned comparative example 2, both ends of each of the first tension wire 932, second tension wire 934, third tension wire 936, and fourth tension wire 938 were fixed to the overhead wire 100 by individual small clamps 924. In other words, no large clamp common to each tension wire was provided, and the ends of each tension wire were misaligned along the overhead wire 100. For this reason, in comparative example 2, it was difficult to fix the tension wires to each small clamp 924.

[0081] In contrast to this, in this embodiment, any two of the tie wires 300 are fixed to the overhead wire 100 by a common clamp 200, which makes it easier to fix the tie wires 300 to each clamp 200 compared to Comparative Example 2. As a result, it is possible to simplify the tie wire fixing step S20.

[0082] (e) In this embodiment, the first tension wire 320, the second tension wire 340, and the third tension wire 360 ​​are fixed at positions spaced vertically downward from the overhead wire 100 by a first vertical distance D1, a second vertical distance D2, and a third vertical distance D3, respectively. The first vertical distance D1, the second vertical distance D2, and the third vertical distance D3 decrease in this order.

[0083] Such a vertical arrangement of the tie wires 300 ensures that the first tie wire 320, the second tie wire 340, and the third tie wire 360 ​​are separated from one another even if at least one of the tie wires 300 resonates with the vibration of the overhead wire 100. This configuration also makes it possible to prevent the first tie wire 320, the second tie wire 340, and the third tie wire 360 ​​from colliding with each other.

[0084] By fixing the first axial end of each of the tie wires 300 and the second end opposite the first end of each of the tie wires 300 at equal intervals vertically downward from the overhead wire 100, it is possible to prevent excessive slack in each of the tie wires 300. In other words, it is possible to form a loop with a well-balanced catenary curve in each of the tie wires 300. This makes it possible to prevent collisions of the tie wires 300 caused by the generation of irregular vibrations in each of the tie wires 300.

[0085] Furthermore, as described above, by making the vertical fixing positions of both ends of each splice wire 300 equal, it is possible to use common components to fix each splice wire 300. Examples of common components include the pair of first clamps 220, the pair of third clamps 260, the gripping portions 224 and bolts 226 of each clamp 200, etc. This allows for a reduction in the cost of components required for the clamps 200.

[0086] <Other Embodiments of the Present Disclosure> Although the embodiments of the present disclosure have been specifically described above, the present disclosure is not limited to the above-described embodiments and can be modified in various ways without departing from the spirit of the present disclosure.

[0087] In the above-described embodiment, the second tie wire 340 is divided into two tie wires 300, but the present disclosure is not limited to this case. The second tie wire 340 may also consist of a single tie wire 300. In this case, both axial ends of the second tie wire 340 may be fixed to the overhead wire 100 by a pair of first clamps 220, and the middle portion of the second tie wire 340 in the axial direction may be fixed to the overhead wire 100 by a second clamp 240. For example, if a longer second tie wire 340 makes work easier during on-site construction, the second tie wire 340 may be connected in a single piece, as described above.

[0088] In the above-described embodiment, the third tie wire 360 ​​is divided into four tie wires 300, but the present disclosure is not limited to this. The third tie wire 360 ​​may consist of a single tie wire 300. In this case, both axial ends of the third tie wire 360 ​​may be fixed to the overhead wire 100 by a pair of first clamps 220, and three intermediate points in the axial direction of the third tie wire 360 ​​may be fixed to the overhead wire 100 by a second clamp 240 and a pair of third clamps 260. For example, if a longer third tie wire 360 ​​makes work easier during on-site construction, the third tie wire 360 ​​may be connected in a single piece, as described above.

[0089] In the above-described embodiment, a case where one second clamp 240 is provided has been described, but the present disclosure is not limited to this case. Two or more second clamps 240 may be provided. In this case, the second tension wire 340 may be fixed to the overhead wire 100 at two or more locations between the pair of first clamps 220. Accordingly, the third tension wire 360 ​​may be fixed to the overhead wire 100 at more locations between the pair of first clamps 220 than in the above-described embodiment.

[0090] In the above embodiment, a pair of third clamps 260 is provided, but the present disclosure is not limited to this. Three or more third clamps may be provided. In this case, the third tension wire 360 ​​may be fixed to the overhead wire 100 at more locations between the pair of first clamps 220 than in the above embodiment.

[0091] In the above-described embodiment, the vibration control device 10 includes the third tension wire 360, the second tension wire 340, and the first tension wire 320 in this order, extending vertically downward from the overhead wire 100. However, the present disclosure is not limited to this example. The vibration control device 10 may include, for example, only the second tension wire 340 and the first tension wire 320, extending vertically downward from the overhead wire 100, in this order. That is, the third tension wire 360 ​​may not be provided. On the other hand, the vibration control device 10 may include, for example, four or more tension wires 300 extending vertically downward from the overhead wire 100. That is, additional tension wires 300 may be provided between the overhead wire 100 and the third tension wire 360. In this way, the number of tension wires 300 may be adjusted depending on the frequency band for which vibration of the overhead wire 100 is to be suppressed.

[0092] In the above-described embodiment, the vibration isolation device 10 is illustrated as not including any other member for suppressing vibration of the overhead wire 100 other than the tie wire 300, but the present disclosure is not limited to this case. As shown in the modified example of Fig. 3, the vibration isolation device 10 may include, for example, a weight damper (e.g., a Stockbridge damper) 400 for suppressing high-frequency vibration of the overhead wire 100 at a position of the overhead wire 100 where the clamp 200 is not provided. In this way, by using the tie wire 300 and the weight damper 400 together, the vibration isolation effect can be further improved.

[0093] <Additional Notes> Preferred aspects of the present disclosure are described below.

[0094] (Appendix 1) a pair of first clamps spaced apart in the axial direction of the overhead wire to hold the overhead wire; a second clamp disposed between the pair of first clamps and configured to hold the overhead wire; a first tie wire arranged along the overhead wire and fixed in a loose state relative to the overhead wire by the pair of first clamps; a second tension wire disposed along the overhead wire between the overhead wire and the first tension wire, and fixed in a slack state relative to the overhead wire by the pair of first clamps and the second clamp; Equipped with Anti-vibration device.

[0095] (Appendix 2) the first tension wire is fixed to the overhead wire between the pair of first clamps at a predetermined axial interval in the axial direction of the overhead wire, The second tension wires are fixed to the overhead wire between the pair of first clamps and the second clamp at an axial interval shorter than the axial interval of the first tension wires in the axial direction of the overhead wire. 10. The vibration isolation device of claim 1.

[0096] (Appendix 3) The lowest point at which the first slackened wire is located and the lowest point at which the second slackened wire is located are offset in the axial direction of the overhead wire. 10. The vibration isolation device according to claim 1 or 2.

[0097] (Appendix 4) the first tension wire is fixed to each of the pair of first clamps at a position vertically downward from the overhead wire by a first vertical distance, The second tension wire is fixed in each of the pair of first clamps and the pair of second clamps at a position vertically downward from the overhead wire by a second vertical distance that is shorter than the first vertical distance. 4. The vibration isolation device according to any one of claims 1 to 3.

[0098] (Appendix 5) the second tension wire forms a plurality of loops defined by the pair of first clamps and the pair of second clamps, The plurality of loops in the second wire are fixed to the overhead wire at different axial intervals in the axial direction of the overhead wire, and are configured so that their resonant frequency bands partially overlap each other. 5. The vibration isolation device according to any one of claims 1 to 4.

[0099] (Appendix 6) The second attachment wires are provided in pairs, The pair of second splices are connected by the second clamp. 6. The vibration isolation device according to any one of claims 1 to 5.

[0100] (Appendix 7) One second attachment wire is provided, the second tension wire has both ends along the overhead line and an intermediate portion between the both ends, the ends of the second tie wire are fixed to the overhead wire by the pair of first clamps, The intermediate portion of the second tie wire is fixed to the overhead wire by the second clamp. 6. The vibration isolation device according to any one of claims 1 to 5.

[0101] (Appendix 8) a plurality of third clamps disposed between the pair of first clamps and the pair of second clamps and configured to hold the overhead wire; a third tension wire that is disposed along the overhead wire between the overhead wire and the second tension wire, and is fixed in a slack state relative to the overhead wire by the pair of first clamps, the second clamp, and the plurality of third clamps; Further equipped 8. The vibration isolation device according to any one of claims 1 to 7.

[0102] (Appendix 9) a step of disposing a pair of first clamps that grip an overhead wire at intervals in an axial direction of the overhead wire; placing a second clamp that grips the overhead wire between the pair of first clamps; a step of placing a first tension wire along the overhead wire and fixing the first tension wire in a slack state relative to the overhead wire using the pair of first clamps; a step of placing a second tension wire along the overhead wire between the overhead wire and the first tension wire, and fixing the second tension wire in a slack state relative to the overhead wire using the pair of first clamps and the second clamp; Equipped with A method for manufacturing an anti-vibration device. [Explanation of symbols]

[0103] 10 Anti-vibration device 100 Overhead line 200 Clamp 220 First clamp 222 Support part 224 Gripping part 226 volts 240 Second Clamp 242 Support part 244 Gripping part 246 volts 260 Third Clamp 262 Support part 264 Gripping part 266 volts 300 Wire 320 First Line 340 Second Attachment Line 342 No. 2-1 Attached Line 344 No. 2-2 Attached Line 360 Third Attachment 362 3rd-1st auxiliary line 364 3rd-2nd Attachment Line 366 3rd-3rd auxiliary line 368 3rd-4th Attachment Line 400 Weight damper 922 Large Clamp 924 Small Clamp 932 First siding line 934 Second spur line 936 3rd spur line 938 4th Attachment Line

Claims

1. a pair of first clamps spaced apart in the axial direction of the overhead wire to hold the overhead wire; a second clamp disposed between the pair of first clamps and configured to hold the overhead wire; a first tie wire arranged along the overhead wire and fixed in a loose state relative to the overhead wire by the pair of first clamps; a second tension wire disposed along the overhead wire between the overhead wire and the first tension wire, and fixed in a slack state relative to the overhead wire by the pair of first clamps and the second clamp; Equipped with Anti-vibration device.

2. the first tension wire is fixed to the overhead wire between the pair of first clamps at a predetermined axial interval in the axial direction of the overhead wire, The second tension wires are fixed to the overhead wire between the pair of first clamps and the second clamp at an axial interval shorter than the axial interval of the first tension wires in the axial direction of the overhead wire. The vibration isolation device according to claim 1 .

3. The lowest point at which the first slackened conductor is located and the lowest point at which the second slackened conductor is located are offset from each other in the axial direction of the imaginary wire. The vibration isolation device according to claim 1 or 2.

4. the first tension wire is fixed to each of the pair of first clamps at a position vertically downwardly spaced a first vertical distance from the overhead wire, The second tension wire is fixed in each of the pair of first clamps and the pair of second clamps at a position vertically downward from the overhead wire by a second vertical distance that is shorter than the first vertical distance. The vibration isolation device according to claim 1 or 2.

5. a plurality of third clamps disposed between the pair of first clamps and the pair of second clamps and configured to hold the overhead wire; a third tension wire disposed along the overhead wire between the overhead wire and the second tension wire, and fixed in a slack state relative to the overhead wire by the pair of first clamps, the second clamp, and the plurality of third clamps; Further equipped The vibration isolation device according to claim 1 or 2.

6. a step of disposing a pair of first clamps that grip the overhead wire at intervals in the axial direction of the overhead wire; disposing a second clamp for gripping the overhead wire between the pair of first clamps; a step of placing a first tension wire along the overhead wire and fixing the first tension wire in a slack state relative to the overhead wire by the pair of first clamps; a step of placing a second tacking wire along the overhead wire between the overhead wire and the first tacking wire, and fixing the second tacking wire in a slack state relative to the overhead wire by the pair of first clamps and the second clamp; Equipped with A method for manufacturing an anti-vibration device.

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