JP2017118683A - Electric wire holding device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric wire holding device capable of elongating a life of a product.SOLUTION: An electric wire holding device for holding an overhead transmission line 100 includes a holding metal fitting 400 for holding the overhead transmission line 100 using a holding surface 414a along the outer shape of the overhead transmission line 100, where an anticorrosion aluminum material 500 containing aluminum as a main component and having an anticorrosion characteristic higher than that of a base material of the holding metal fitting 400 is provided so as to cover the holding surface 414a of the holding metal fitting 400.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an electric wire gripping device attached to an overhead power transmission line.

  Various electric wire gripping devices are attached to the overhead power transmission line. Examples of the electric wire gripping device include a spacer provided in order to keep the interval between the overhead power transmission lines constant in a multi-conductor overhead power transmission line (for example, Patent Document 1).

JP 2000-245045 A JP 2006-271128 A

  When an overhead power transmission line is laid in a coastal area or the like, corrosion may occur in the overhead power transmission line or the wire gripping device due to corrosive substances such as sea salt particles present in the surrounding environment. In particular, at locations where the wire gripping device grips the overhead power transmission line, moisture containing a corrosive substance penetrates into the minute gap between the gripping surface (inner surface) of the gripping metal fitting of the wire gripping device and the overhead power transmission line. Corrosive substances concentrate and stagnate at the location. As a result, corrosion of the gripping surface of the gripping fitting of the wire gripping device is likely to proceed. If the gripping surface of the gripping bracket of the wire gripping device is damaged due to corrosion, the gap between the gripping surface of the gripping bracket and the overhead power transmission line will not be widened and it will not be possible to secure the specified gripping force. There is a risk of damage to the transmission line.

  An object of the present invention is to provide an electric wire gripping device that can extend the life of a product.

According to one aspect of the invention,
An electric wire gripping device for gripping an overhead power transmission line having a strand composed mainly of aluminum in the outermost layer,
A gripping fitting for gripping the overhead power transmission line by a gripping surface along the outer shape of the overhead power transmission line,
An electric wire gripping device is provided in which a corrosion-resistant aluminum material mainly composed of aluminum and having higher corrosion resistance than the base material of the gripping metal is provided so as to cover the gripping surface of the gripping metal.

  ADVANTAGE OF THE INVENTION According to this invention, the electric wire holding apparatus which can extend the lifetime of a product is provided.

It is a schematic structure figure showing an electric wire gripping device concerning one embodiment of the present invention. (A) is the schematic block diagram which expanded a part of electric wire holding device which concerns on one Embodiment of this invention, (b) is the schematic sectional drawing which expanded a part of the holding | grip metal fitting of (a). . (A) is the schematic sectional drawing which expanded the corrosion-resistant aluminum material which consists of an Al-Mn alloy, (b) is the schematic sectional drawing which expanded the normal aluminum material. (A) is the schematic block diagram which expanded a part of electric wire holding device which concerns on the modification of one Embodiment of this invention, (b) is the schematic cross section which expanded a part of the holding | grip metal fitting of (a). FIG.

<Knowledge obtained by the inventors>
A structure in which a member that suppresses corrosion (a member with high corrosion resistance) is interposed between the gripping surface of the gripping bracket of the wire gripping device and the overhead power transmission line in order to suppress corrosion of the gripping surface of the gripping bracket of the wire gripping device Can be considered.

  For example, a structure in which anticorrosive grease is interposed between a gripping surface of a gripping metal fitting of an electric wire gripping device and an overhead power transmission line is disclosed (for example, Patent Document 2). In this structure, the anticorrosive grease suppresses the entry of corrosive substances into the above-mentioned location, so that not only the overhead power transmission line but also the gripping surface of the gripping metal is suppressed.

However, in the structure in which the anticorrosion grease is interposed between the holding metal fitting of the electric wire holding device and the overhead power transmission line, although the above-described effect of suppressing corrosion is recognized, the following problems may occur.
(1) The anticorrosion grease may deteriorate due to the influence of Joule heat caused by energization of the overhead power transmission line or ultraviolet irradiation by sunlight. In this case, the anticorrosive property of the anticorrosive grease is lowered.
(2) When the anti-corrosion grease deteriorates, it is necessary to repair the anti-corrosion grease (removal of deteriorated grease or refilling with new grease). However, it is difficult to detect deterioration of the anticorrosive grease inside the gripping fitting of the wire gripping device, and it may be overlooked.
(3) When the anti-corrosion grease deteriorates, the deteriorated anti-corrosion grease may act as a hygroscopic substance, and corrosion may be accelerated.
(4) When the anti-corrosion grease is interposed (filled) between the gripping bracket of the electric wire gripping device and the overhead power transmission line, compared with the case where the electric wire gripping device is attached to the overhead power transmission line without using anti-corrosion grease. , Work efficiency is bad.

  Further, as another structure, for example, a structure in which rubber having high elasticity is interposed between the holding fitting of the electric wire holding device and the overhead power transmission line so as to follow the shape of the holding surface of the holding fitting. However, with this structure, when the wire gripping device receives a direct lightning strike, it is very difficult to release the lightning current to the overhead power transmission line side, and not only the gripping bracket of the wire gripping device but also the overhead There is a high possibility that the transmission line will be severely melted.

  Or the structure which provides a noble metal layer so that the holding surface of the holding metal fitting of an electric wire holding apparatus, for example may be considered. However, in this structure, although the corrosion of the gripping surface of the gripping metal is suppressed, there is a possibility that the outermost aluminum wire of the overhead power transmission line may be corroded by the corrosive action of the dissimilar metal contact with the noble metal layer. Extremely expensive.

  Therefore, it is desired to solve these problems and to suppress the corrosion of the gripping metal fitting of the electric wire gripping device while suppressing the corrosive action caused by the dissimilar metal contact between the gripping metal fitting of the electric wire gripping device and the overhead power transmission line. The present invention is based on the above findings found by the present inventors.

<One Embodiment of the Present Invention>
(1) Electric wire holding device The electric wire holding device which concerns on one Embodiment of this invention is demonstrated using FIG. 1 and FIG. FIG. 1 is a schematic configuration diagram showing an electric wire gripping device according to the present embodiment. FIG. 2A is a schematic configuration diagram in which a part of the electric wire gripping device according to the present embodiment is enlarged, and FIG. 2B is a schematic sectional view in which a part of the gripping metal fitting in FIG. is there.

  The electric wire gripping device 10 of the present embodiment grips the overhead power transmission line 100, and is configured as a spacer for maintaining a constant interval between the overhead power transmission lines 100 in the multiconductor overhead power transmission line 100, for example. ing. Specifically, the electric wire gripping device 10 includes, for example, a main body frame 200, a support arm (connecting member, eye metal fitting) 320, and a holding metal fitting (gripping member, clamp portion) 400.

  In addition, the overhead power transmission line 100 gripped by the wire gripping device 10 of the present embodiment is configured, for example, as an aluminum-covered steel core aluminum stranded wire (ACSR / AC), and the steel core portion and aluminum on the outer periphery of the steel core portion. An external stranded wire layer in which a plurality of strands made of (Al) are twisted together.

(Body frame)
The main body frame 200 of the electric wire gripping device 10 is configured as a frame-like member for keeping the interval between the overhead power transmission lines 100 constant. Here, the wire gripping device 10 is configured to grip four overhead power transmission lines 100, and the main body frame 200 includes, for example, four frame members 220 and four corner support portions 240. doing. The main body frame 200 is configured in a rectangular shape by connecting each of the four frame members 220 via each of the four corner support portions 240.

(Support arm)
The support arm 320 is disposed at a corner of the main body frame 200 and is configured to connect the main body frame 200 and a gripping metal fitting 400 described later. The support arm 320 is fixed to the corner support portion 240 of the main body frame 200 by being screwed with a nut 340 across the corner support portion 240 of the main body frame 200.

(Grip bracket)
As shown in FIGS. 1 and 2A, the gripping metal fitting 400 is swingably coupled to the support arm 320 and configured to grip the overhead power transmission line 100. The base material of the holding metal fitting 400 is made of an aluminum alloy such as Al—Mg—Si, for example. For example, the Mg concentration is 0.2 wt% or more and 0.4 wt% or less, and the Si concentration is 6.5 wt% or more and 7.5 wt% or less.

  The holding metal fitting 400 includes, for example, a main body part 410 and a lid part 460. In addition, the main body 410 includes, for example, a base 412, a grip 414, and a tightening mechanism 420.

  The base portion 412 of the main body 410 is connected to the support arm 320 so as to be swingable, and is configured to support the grip portion 414 in a predetermined direction.

  The grip portion 414 of the main body portion 410 is provided on the opposite side of the base portion 412 with the tightening mechanism 420 interposed therebetween, and has a grip surface 414 a for gripping the overhead power transmission line 100. The gripping surface 414 a of the gripping part 414 has a semicircular arc shape along the outline of the overhead power transmission line 100 so as to surround the overhead power transmission line 100.

  The lid portion 460 is hinged to the grip portion 414 via the hinge shaft 450 and has a grip surface 460 a for gripping the overhead power transmission line 100. The grip surface 460 a of the lid 460 has a semicircular arc shape along the outer shape of the overhead power transmission line 100 so as to surround the overhead power transmission line 100, similarly to the grip surface 414 a of the grip portion 414. Thus, the overhead power transmission line 100 is gripped so as to be sandwiched between the gripping surface 414a of the gripping portion 414 and the gripping surface 460a of the lid portion 460.

  Note that an engagement hole (hook hole) 462 that engages with an engagement portion (hook portion) 440 described later is provided at the end of the lid portion 460 opposite to the hinge shaft 450.

  The tightening mechanism 420 of the main body portion 410 is configured to tighten the lid portion 460 to the grip portion 414 side of the main body portion 410 and to open the lid portion 460 from the grip portion 410. Specifically, the tightening mechanism 420 includes, for example, an engaging portion 440, a tightening shaft portion 422, a spring 424, a bolt 426, and a case portion 428.

  The engaging portion 440 is disposed so as to protrude from the base portion 412 of the main body portion 410 to the lid portion 460 side, and is configured to be inserted into and engaged with the engaging hole 462 of the lid portion 460. The fastening shaft portion 422 is connected to the proximal end side of the engaging portion 440 and is disposed in the case portion 428. The spring 424 is fitted on the outer side of the tightening shaft portion 422 and is locked to a flange portion (not shown) of the tightening shaft portion 422. Further, the bolt 426 is screwed into a bolt insertion hole (not shown) of the case portion 428 and is disposed along the axis of the fastening shaft portion 422. Further, the tip of the bolt 426 is in contact with the end of the tightening shaft 422.

  When the lid portion 460 is closed and tightened to the grip portion 414 side, the spring 424 is loosened by loosening the bolt 426 in the direction in which the engagement portion 440 is engaged with the engagement hole 462 of the lid portion 460. The tightening shaft portion 422 is pulled toward the bolt 426 by the repulsive force. Accordingly, the engaging portion 440 is drawn into the case portion 428 while being engaged with the engaging hole 462 of the lid portion 460. Accordingly, the lid portion 460 can be closed and tightened to the grip portion 414 side, and the overhead power transmission line 100 can be firmly gripped by the grip portion 414 and the lid portion 460.

  On the other hand, when the lid 460 is opened, the bolt 426 is screwed to push out the tightening shaft 422 against the repulsive force of the spring 424. Accordingly, the engaging portion 440 is pushed away from the engaging hole 462 of the lid portion 460. At this time, the lid portion 460 can be opened by rotating the engagement portion 440 and releasing the engagement between the engagement portion 440 and the engagement hole 462 of the lid portion 460.

(Corrosion resistant aluminum)
As shown in FIGS. 2A and 2B, in this embodiment, in order to suppress corrosion of the gripping metal 400, there is Al between the gripping surfaces 414 a and 460 a of the gripping metal 400 and the overhead power transmission line 100. And a corrosion-resistant aluminum material 500 having a higher corrosion resistance than the base material of the holding fitting 400 is interposed. The term “corrosion resistance” as used herein means resistance to corrosive substances such as sea salt particles.

  The corrosion-resistant aluminum material 500 is provided so as to cover each of the gripping surfaces 414a and 460a of the gripping metal 400. Corrosion-resistant material grip surfaces 510 a and 510 b corresponding to the grip surfaces 414 a and 460 a of the grip metal fitting 400 are formed on the surface of the corrosion-resistant aluminum material 500. The overhead power transmission line 100 is gripped by the corrosion resistant material gripping surfaces 510 a and 510 b of the corrosion resistant aluminum material 500.

  The corrosion-resistant aluminum material 500 is in contact with the gripping surfaces 414a and 460a along the shape of the gripping surfaces 414a and 460a of the gripping metal 400. Further, the corrosion-resistant aluminum material 500 is provided on the entire gripping surfaces 414a and 460a, for example. Thereby, corrosion of the holding surfaces 414a and 460a of the holding fitting 400 can be suppressed.

  For example, the corrosion-resistant aluminum material 500 is coated on each of the holding surfaces 414a and 460a of the holding metal fitting 400 by various film forming methods. In this case, the corrosion-resistant aluminum material 500 is configured as a coating film formed on each of the holding surfaces 414a and 460a of the holding metal fitting 400 by, for example, a thermal spraying method. Thereby, the corrosion-resistant aluminum material 500 can be formed integrally with the gripping surfaces 414a and 460a of the gripping metal 400, and can be brought into close contact with no gap. Even if a corrosive substance enters and concentrates between the corrosion-resistant material gripping surfaces 510a and 510b of the corrosion-resistant aluminum material 500 provided so as to cover the gripping surfaces 414a and 460a of the gripping bracket 400 and the overhead power transmission line 100, The corrosion of the corrosion resistant material gripping surfaces 510a and 510b can be suppressed as compared with the conventional case where the overhead power transmission line is gripped by the gripping surface of the gripping fitting.

  The corrosion-resistant aluminum material 500 is made of, for example, an Al—Mn alloy containing manganese (Mn), or made of aluminum (high-purity aluminum) having a higher purity than the base material of the holding fitting 400.

  Here, the corrosion resistance effect of the corrosion-resistant aluminum material 500 made of the above-described material will be described with reference to FIG. FIG. 3A is an enlarged schematic cross-sectional view of a corrosion-resistant aluminum material made of an Al—Mn alloy, and FIG. 3B is an enlarged schematic cross-sectional view of an ordinary aluminum material.

  As shown in FIG. 3B, a normal aluminum material contains elements such as iron (Fe) and silicon (Si) as inevitable impurities. These inevitable impurities are often present as Al—Fe-based intervening particles, Al—Si-based intervening particles, or Al—Fe—Si-based intervening particles in the base Al. Since these inevitable impurities intervening particles have a noble potential with respect to the base Al, a corrosion mechanism of dissimilar metal contact acts in a local region around the intervening particles. For this reason, when a corrosive substance adheres to the aluminum material, the corrosion of the aluminum material often proceeds starting from these intervening particles.

  On the other hand, as shown in FIG. 3A, in the corrosion-resistant aluminum material made of an Al—Mn alloy, an Al—Mn-based intermetallic compound is formed by the added Mn in the base Al. Al-Mn-Fe-based, Al-Mn-Si-based, or Al-Mn-Fe-Si-based intervening particles are formed. Since the potential of the Al-Mn-Fe-based, Al-Mn-Si-based, or Al-Mn-Fe-Si-based intervening particles is close to the potential of the parent phase Al-Mn, local potential around these intervening particles In the target region, corrosion due to dissimilar metal contact is suppressed. In this way, corrosion can be suppressed in the corrosion-resistant aluminum material made of the Al—Mn alloy.

  In addition, in the corrosion-resistant aluminum material 500 made of high-purity aluminum, since the amount of inevitable impurities such as Fe and Si is small, intervening particles of inevitable impurities such as Al—Fe, Al—Si, or Al—Fe—Si The amount of formation is small. Thereby, corrosion can be suppressed in the corrosion-resistant aluminum material 500 made of high-purity aluminum.

  When the corrosion-resistant aluminum material 500 is made of an Al—Mn alloy, the Mn concentration of the corrosion-resistant aluminum material 500 is, for example, 0.1 wt% or more and 2.0 wt% or less. If the Mn concentration is less than 0.1% by weight, a sufficient corrosion resistance effect cannot be obtained. On the other hand, when the Mn concentration is 0.1% by weight or more, a predetermined corrosion resistance effect can be obtained. On the other hand, if the Mn concentration is more than 2.0% by weight, the corrosion resistance is saturated and the workability is lowered. On the other hand, when the Mn concentration is 2.0% by weight or less, a sufficient corrosion resistance effect can be obtained according to the Mn concentration, and deterioration of workability can be suppressed. In addition, it is more preferable that the Mn concentration of the corrosion-resistant aluminum material 500 is, for example, 0.2 wt% or more and 1.2 wt% or less. Thereby, while being able to obtain a good corrosion resistance effect, good workability can be obtained.

  When the corrosion-resistant aluminum material 500 is made of aluminum (high-purity aluminum) having a higher purity than the base material of the holding fitting 400, the purity of Al of the corrosion-resistant aluminum material 500 is, for example, 99.80% by weight or more and 99.95. % By weight or less. If the purity of Al is less than 99.80% by weight, a sufficient corrosion resistance effect cannot be obtained. On the other hand, when the purity of Al is 99.80% by weight or more, a predetermined corrosion resistance effect can be obtained. On the other hand, if the purity of Al exceeds 99.95% by weight, the cost of the corrosion-resistant aluminum material 500 is increased. On the other hand, when the purity of Al is 99.95% by weight or less, the cost of the corrosion-resistant aluminum material 500 can be suppressed from increasing. In addition, it is more preferable that the purity of Al of the corrosion-resistant aluminum material 500 is, for example, 99.84 wt% or more and 99.95 wt% or less. Thereby, a favorable corrosion resistance effect is obtained while suppressing costs.

  Moreover, the thickness of the corrosion-resistant aluminum material 500 is 0.1 mm or more and 10 mm or less, for example. When the thickness of the corrosion-resistant aluminum material 500 is less than 0.1 mm, the corrosion-resistant aluminum material 500 is too thin and easily disappears due to corrosion (the corrosion region easily reaches the gripping metal 400), and a sufficient corrosion resistance effect cannot be obtained. . On the other hand, when the thickness of the corrosion-resistant aluminum material 500 is 0.1 mm or more, a predetermined corrosion resistance effect can be obtained. On the other hand, if the thickness of the corrosion-resistant aluminum material 500 is more than 10 mm, the corrosion resistance effect is saturated and the cost is increased. On the other hand, when the thickness of the corrosion-resistant aluminum material 500 is 10 mm or less, a sufficient corrosion resistance effect can be obtained according to the thickness, and an increase in cost can be suppressed. The thickness of the corrosion-resistant aluminum material 500 is more preferably not less than 2.4 mm and not more than 8.8 mm, for example. Thereby, while suppressing a cost, while being able to acquire a favorable corrosion-resistant effect, favorable workability is obtained.

(2) Effects according to the present embodiment According to the present embodiment, the following one or more effects are achieved.

(A) According to this embodiment, the corrosion-resistant aluminum material 500, which is mainly composed of Al and has higher corrosion resistance than the base material of the gripping metal 400, is provided so as to cover the gripping surfaces 414a and 460a of the gripping metal 400. Yes. Thereby, corrosion of the holding surfaces 414a and 460a of the holding fitting 400 can be suppressed. Further, even if the corrosion-resistant material gripping surfaces 510a and 510b of the corrosion-resistant aluminum material 500 provided so as to cover the gripping surfaces 414a and 460a of the gripping metal 400 and the overhead power transmission line 100, corrosive substances have entered and concentrated. However, the corrosion of the corrosion resistant material gripping surfaces 510a and 510b can be suppressed as compared with the conventional case where the overhead power transmission line is gripped by the gripping surface of the gripping metal fitting.

  As described above, the corrosion of the corrosion-resistant material gripping surfaces 510a and 510b that are in direct contact with the overhead power transmission line 100 can be suppressed, so that the life of the wire gripping device 10 can be significantly extended. That is, the operation cost concerning maintenance of the electric wire gripping device 10 can be reduced. In addition, the overhead power transmission line 100 is stably gripped by the wire gripping device 10 for a long period of time, and damage to the overhead power transmission line 100 due to corrosion defects on the gripping surfaces 414a and 460a of the gripping metal fitting 400 can be suppressed. As a result, the occurrence of a failure in the overhead power transmission line is suppressed in advance, and stable power supply is possible.

(B) According to the present embodiment, the corrosion-resistant aluminum material 500 is less likely to deteriorate with time as compared with the anti-corrosion grease, and can stably maintain the corrosion resistance. In addition, for example, when the corrosion-resistant aluminum material 500 is a coating film, the gripping metal fitting 400 can be covered with the corrosion-resistant aluminum material 500 in advance. Therefore, in the corrosion-resistant aluminum material 500 of the present embodiment, the workability at the installation site of the overhead power transmission line 100 is better than that of the anti-corrosion grease.

(C) According to the present embodiment, since the corrosion-resistant aluminum material 500 is conductive, when the wire gripping device 10 receives a direct lightning strike, the lightning strike current can be released to the overhead power transmission line 100. Thereby, it is possible to prevent the wire gripping device 10 and further the overhead power transmission line 100 close to the wire gripping device 10 from being melted by direct lightning.

(D) According to the present embodiment, the main component of the corrosion-resistant aluminum material 500 is Al like the strands in the outermost layer of the overhead power transmission line 100. The potential difference between the corrosion-resistant aluminum material 500 and the wires of the overhead power transmission line 100 is extremely small. Thereby, it is possible to suppress the corrosion of the dissimilar metal contact between the corrosion-resistant aluminum material 500 and the strands of the overhead power transmission line 100 (corrosion progress based on the potential difference between the two) and to suppress the corrosion of the overhead power transmission line 100. Can do. That is, the corrosion-resistant material gripping is performed by interposing the corrosion-resistant aluminum material 500 containing Al as a main component between the gripping surfaces 414 a and 460 a of the gripping metal fitting 400 and the overhead power transmission line 100 in the same manner as the wires of the overhead power transmission line 100. Corrosion of the surfaces 510a and 510b can be suppressed. As a result, corrosion of the gripping surfaces 414a and 460a of the gripping bracket 400 can be suppressed, and corrosion of the overhead power transmission line 100 can be suppressed.

<Modification of this embodiment>
A modification of the present embodiment will be described with reference to FIG. FIG. 4A is a schematic configuration diagram in which a part of an electric wire gripping device according to a modification of the present embodiment is enlarged, and FIG. 4B is a schematic cross-sectional view in which a part of the gripping metal fitting in FIG. It is.

  The following modification of the present embodiment is different from the above-described embodiment in the configuration of the corrosion-resistant aluminum material. Hereinafter, in this modification, only elements different from the present embodiment will be described, and description of elements that are substantially the same as those described in the present embodiment will be omitted.

  As shown in FIG. 4A, the corrosion-resistant aluminum material 502 of the present modification may be configured as a collar provided along the shape of the gripping surfaces 414a and 460a of the gripping bracket 400, for example. Thereby, when the corrosion-resistant aluminum material 500 is corroded, the wire gripping device 10 can be repaired by replacing only the corrosion-resistant aluminum material 500 as the collar.

  The corrosion-resistant aluminum material 502 is provided so as to cover each of the holding surfaces 414a and 460a of the holding metal fitting 400, as in the first embodiment. On the surface of the corrosion-resistant aluminum material 500, corrosion-resistant material grip surfaces 512a and 512b corresponding to the grip surfaces 414a and 460a of the grip metal fitting 400 are formed. The overhead power transmission line 100 is gripped by the corrosion-resistant material gripping surfaces 512 a and 512 b of the corrosion-resistant aluminum material 500.

  In addition, the corrosion-resistant aluminum material 502 is fitted in each of the gripping portion 414 and the lid portion 460 of the gripping metal fitting 400 and is in contact with each of the gripping surfaces 414a and 460a of the gripping metal fitting 400. Thereby, especially the corrosion of the holding | grip metal fitting 400 can be suppressed.

  Further, the corrosion-resistant aluminum material 502 is provided in an annular shape so as to surround the entire circumference of the overhead power transmission line. As a result, the entire gripping surfaces 414 a and 460 a of the gripping metal fitting 400 are covered with the corrosion-resistant aluminum material 500.

  In addition, the corrosion-resistant aluminum material 502 is configured in a halved shape, for example, by a portion 512 that is fitted on the grip portion 414 side of the main body 410 and a portion 522 that is fitted on the lid 460. When the gripping bracket 400 is attached to the overhead power transmission line 100 with a predetermined torque, a predetermined gripping strength can be obtained with the corrosion-resistant aluminum material 500 interposed. As described above, since the corrosion-resistant aluminum material 500 is configured in a half shape, when the lid portion 460 and the grip portion 414 are opened, the half-shape corrosion-resistant aluminum material 500 is opened together with these, thereby 400 can be easily detached from the overhead power transmission line 100.

  Whether the corrosion-resistant aluminum material is configured as a coating film or a color may be selected in consideration of processing time, processing cost, workability on site, and the like of the corrosion-resistant aluminum material.

<Other Embodiments of the Present Invention>
As mentioned above, although embodiment of this invention was described concretely, this invention is not limited to the above-mentioned embodiment, It can change variously in the range which does not deviate from the summary.

  In the above-described embodiment, the case where the wire gripping device 10 is configured as a spacer has been described. However, the wire gripping device may be configured as a damper for preventing torsion or a clamp for preventing vibration.

  In the above-described embodiment, the case where the wire gripping device 10 is configured as a spacer that grips the four overhead power transmission lines 100 has been described. However, the wire gripping device has two, three, or five or more overhead transmissions. You may be comprised as a spacer which grips an electric wire.

  In the above-described embodiment, the case where the corrosion-resistant aluminum material 500 is provided on the entire surface along the gripping surfaces 414a and 460a of the gripping metal 400 has been described. However, the corrosion-resistant aluminum material is formed of the gripping surface of the gripping metal and the overhead power transmission line. May be partially provided between the two.

  For example, the corrosion-resistant aluminum material may be provided on the entire circumferential direction only on both ends in the axial direction of the overhead power transmission line on the gripping surface of the gripping metal fitting. That is, the corrosion-resistant aluminum material may be provided only at the entrance of the gap between the gripping surface of the gripping metal and the overhead power transmission line.

  Alternatively, for example, the corrosion-resistant aluminum material may be provided only on the gripping surface located on the vertically lower side of the gripping metal fitting. Thereby, the corrosion of the part which a corrosive substance tends to accumulate can be suppressed.

  In the above-described embodiment, the case where the corrosion-resistant aluminum material 500 includes Mn has been described. However, the corrosion-resistant aluminum material may include Mg as an additive having corrosion resistance. However, a corrosion-resistant aluminum material containing Mn is preferable because it has a higher corrosion resistance than a corrosion-resistant aluminum material containing Mg.

  In the above-described embodiment, the case where the corrosion-resistant aluminum material 500 is provided so as to cover the gripping surfaces 414a and 460a of the gripping bracket 400 has been described. However, the corrosion-resistant aluminum material is also provided in other portions of the wire gripping device. May be. For example, the corrosion-resistant aluminum material may be covered over the entire surface of the wire gripping device. Thereby, corrosion of the whole electric wire holding apparatus can be suppressed.

  Next, examples according to the present invention will be described together with comparative examples.

(1) Manufacture of electric wire gripping device (Examples 1 to 7, Comparative Examples 1 to 4)
Iron (Fe) 0.20% by weight, silicon (Si) 0.08% by weight, copper (Cu) 0.001% by weight, titanium (Ti) 0.003% by weight, vanadium (V) 0.002% by weight, By adding manganese (Mn) in various blending amounts to aluminum ingots with a balance of aluminum (Al) and a purity of 99.71% by weight, corrosion-resistant aluminum materials having different Mn concentrations are produced. As shown in Table 1, the wire gripping devices of Examples 1 to 7 and Comparative Examples 1 to 4 were manufactured. In each example and comparative example, the base material of the gripping fixture was Al-Mg-Si (Mg concentration 0.31 wt%, Si concentration 7.1 wt%). Moreover, the corrosion-resistant aluminum material was configured as a half-cut collar, and the thickness of the corrosion-resistant aluminum material was 3 mm.

(Examples 11-16, Comparative Examples 11-14)
A 99.71 wt.% Pure aluminum bullion tested in Examples 1-7 and Comparative Examples 1-4, a high purity aluminum bullion having a purity of 99.992 wt.%, And an Fe concentration of 10 wt. By smelting aluminum-iron alloy (Al-10 wt% Fe) and aluminum-silicon alloy (Al-20 wt% Si) with a Si concentration of 20 wt% at various compounding ratios, Corrosion-resistant aluminum materials having different purities were produced, and the electric wire gripping devices of Examples 11 to 16 and Comparative Examples 11 to 14 were produced as shown in Table 2 below. In each example and comparative example, the base material of the gripping fixture was Al-Mg-Si (Mg concentration 0.31 wt%, Si concentration 7.1 wt%). Moreover, the corrosion-resistant aluminum material was configured as a half-cut collar, and the thickness of the corrosion-resistant aluminum material was 3 mm.

(Examples 21 to 27, Comparative Examples 21 to 24)
Thickness by adding Mn to 99.71 wt% aluminum ingots tested in Examples 1 to 7, Comparative Examples 1 to 4, Examples 11 to 16 and Comparative Examples 11 to 14 Were manufactured, and the electric wire gripping devices of Examples 21 to 27 and Comparative Examples 21 to 24 were manufactured as shown in Table 3 below. In each example and comparative example, the base material of the gripping fixture was Al-Mg-Si (Mg concentration 0.31 wt%, Si concentration 7.1 wt%). Further, the corrosion-resistant aluminum material was configured as a half-shaped collar, and the Mn concentration of the corrosion-resistant aluminum material was 0.9% by weight.

(2) Evaluation (corrosion resistance)
The corrosion resistance of the wire gripping device was evaluated by a corrosion acceleration test for each of the above-described examples and comparative examples. In the accelerated corrosion test, first, an aluminum-clad steel core aluminum stranded wire (ACSR / AC) as an overhead power transmission line with an aluminum conductor cross-sectional area of 160 mm ² stretched horizontally is gripped with the wire gripping device of each example and each comparative example. It was. Next, in a state where electricity is applied with a transformer so that the temperature of the overhead power transmission line becomes 90 ° C., sulfuric acid is added to a 5 wt% sodium chloride aqueous solution, and an electrolyte solution adjusted to pH 4.8 is sprayed for 10 minutes. Then, this cycle was repeated 2300 cycles, with leaving in the atmosphere for 90 minutes as one cycle. And while observing the appearance and cross-sectional appearance of the corrosion-resistant aluminum material provided so as to cover the gripping surface of the gripping hardware of the wire gripping device, the corrosion depth is measured by observing the cross-section with an optical microscope. Evaluation was performed.

  As a result of the corrosion resistance evaluation, in Examples 1 to 7, 11 to 17, and Comparative Examples 1 to 4 and 11 to 14, the progress of the corrosion of the corrosion resistant aluminum material is slight, and when the gripping surface of the corrosion resistant aluminum material is touched The case where the degree of roughness is small is marked as ◎. Although corrosion progress of the corrosion-resistant aluminum material and roughness when the gripping surface of the corrosion-resistant aluminum material is touched are observed, the degree of corrosion defect between the gripping bracket and the overhead power transmission line is The case where the gripping bracket is small and firmly attached to the overhead power transmission line is marked with ○, and the corrosion progress of the corrosion-resistant aluminum material and the roughness when the gripping surface of the corrosion-resistant aluminum material is touched are very large. A case where a gap due to a corrosion defect with the overhead power transmission line is visually recognized and the metal fitting attached to the electric wire moves when an external force is applied by hand is indicated as x.

  Further, in Examples 21 to 27 and Comparative Examples 21 to 24, the case where the ratio of the maximum corrosion depth to the thickness of the corrosion-resistant aluminum material is less than 10% is ◎, and the maximum corrosion depth with respect to the thickness of the corrosion-resistant aluminum material When the thickness ratio is 10% or more and less than 50%, ◯, and when the ratio of the maximum corrosion depth to the thickness of the corrosion resistant aluminum material is 50% or more and less than 80%, ×, and the thickness of the corrosion resistant aluminum material The case where the ratio of the maximum corrosion depth to 80% or more was defined as xx.

(Processability)
In each of the above-described examples and comparative examples, workability was evaluated depending on whether or not a surface defect occurred when a corrosion-resistant aluminum material configured as a half-shaped collar was subjected to plastic working and cutting. When there is no surface defect, ◎, when there are few surface defects and no problem in practical use, ◯, when there are surface defects, ×, when there are many surface defects XX It was.

(cost)
In each of the above-described examples and comparative examples, the cost (material cost) of the corrosion-resistant aluminum material configured as a halved collar was evaluated. If the cost increment is very small, ◎, and a slight increase in cost, but ○ if the level is not problematic for practical use, and × if the practical use is difficult due to the cost increase, the degree of cost increase The case where it was remarkably large and practical use was impossible was set as xx.

(Comprehensive evaluation)
Based on the results of the above corrosion resistance, workability and cost, as a comprehensive evaluation, the case of being excellent was marked with ◎, the case of being good was marked with ◯, the case of being bad was marked with ×, and the case of being extremely bad was marked with xx.

(3) Results First, the results of Examples 1 to 7 and the results of Comparative Examples 1 to 4 are compared.

  In Comparative Examples 1 and 2 in which the Mn concentration was less than 0.1% by weight, the workability and cost were good, but the progress of corrosion was enormous, and the evaluation of corrosion resistance was x. In Comparative Examples 1 and 2, the amount of Al-Mn-Fe-based, Al-Mn-Si-based, or Al-Mn-Fe-Si-based intervening particles formed due to the small amount of added Mn Since the amount of interstitial particles such as Al—Fe, Al—Si, or Al—Fe—Si, which has a relatively lower potential than the parent phase Al, is relatively large, corrosion proceeds. It is thought that. On the other hand, in Comparative Examples 3 and 4 in which the Mn concentration was more than 2.0% by weight, although the corrosion resistance was good, surface defects occurred during processing, and the evaluation of workability was x or xx. In Comparative Examples 3 and 4, since the amount of added Mn was too large, and the product yield due to the decrease in workability was greatly reduced, the corrosion-resistant aluminum material was hardened, and it was considered that the workability was reduced. . Furthermore, in Comparative Example 4, the cost increase of the corrosion-resistant aluminum material was remarkably large, and it was at a level that could not be put into practical use, so the cost evaluation was XX. In Comparative Example 4, since the amount of expensive Mn added was excessively increased, the cost was increased.

  On the other hand, in Examples 1 to 7 in which the Mn concentration was 0.1% by weight or more and 2.0% by weight or less, all evaluations of corrosion resistance, workability and cost were good. That is, when the corrosion-resistant aluminum material contains Mn, the Mn concentration of the corrosion-resistant aluminum material is 0.1 wt% or more and 2.0 wt% or less, so that the Al-Mn-Fe system, Al-Mn is contained in the corrosion-resistant aluminum material. It was confirmed that sufficient corrosion resistance was obtained according to the Mn concentration by forming -Si-based or Al-Mn-Fe-Si-based intervening particles. In addition, it was confirmed that no particular problem was found in the workability of the corrosion-resistant aluminum material. Furthermore, it was confirmed that if the Mn concentration is 0.1 wt% or more and 2.0 wt% or less, the cost is suppressed from increasing, and there is no problem in practical use.

  Next, the results of Examples 11 to 16 are compared with the results of Comparative Examples 11 to 14.

  In Comparative Examples 11 and 12 in which the purity of Al was less than 99.80% by weight, although the workability and cost were good, the corrosion progressed remarkably and the corrosion resistance was evaluated as x. In Comparative Examples 1 and 2, the amount of Fe and Si contained is large due to the low purity, and Al—Fe, Al—Si, or Al—Fe—Si containing these inevitable impurities Since many intervening particles such as the system remained, it is considered that the corrosion progressed. On the other hand, in Comparative Examples 13 and 14 in which the purity of Al exceeded 99.95% by weight, the corrosion resistance and workability were good, but the cost of the corrosion resistant aluminum material was remarkably high, and the cost evaluation was xx. . In Comparative Examples 13 and 14, the higher the purity, the more the refining process corresponding to the purity is required, resulting in an increase in cost.

  On the other hand, in Examples 11 to 16 in which the purity of Al was 99.80 wt% or more and 99.95 wt% or less, all evaluations of corrosion resistance, workability and cost were good. That is, when the corrosion-resistant aluminum material is made of high-purity aluminum, the purity of Al in the corrosion-resistant aluminum material is 99.80 wt% or more and 99.95 wt% or less, so that Al—Fe, Al—Si, or Al It was confirmed that -Fe-Si-based intervening particles can be reduced and a sufficient corrosion resistance effect can be obtained. It was also confirmed that the workability of the corrosion-resistant aluminum material was also good. Furthermore, it was confirmed that if the purity of Al is 99.80 wt% or more and 99.95 wt% or less, the cost increase is suppressed and there is no problem in practical use.

  Next, the results of Examples 21 to 27 and the results of Comparative Examples 21 to 24 are compared.

  In Comparative Examples 21 and 22 in which the thickness of the corrosion-resistant aluminum material was less than 0.1 mm, although the cost was good, the corrosion-resistant aluminum material was too thin, so the ratio of the maximum corrosion depth to the thickness of the corrosion-resistant aluminum material was The corrosion resistance was evaluated as x or xx. In particular, in Comparative Example 21, since the corrosion-resistant aluminum material was too thin, corrosion occurred through the corrosion-resistant aluminum material. Moreover, in the comparative example 21, since the corrosion-resistant aluminum material was too thin, it was difficult to process into a predetermined shape, and the evaluation of workability was x. On the other hand, in Comparative Examples 23 and 24 in which the thickness of the corrosion-resistant aluminum material exceeds 10 mm, although the corrosion resistance and workability are good, the corrosion-resistant aluminum material is too thick. Was x or xx.

  On the other hand, in Examples 21 to 27 in which the thickness of the corrosion-resistant aluminum material was 0.1 mm or more and 10 mm or less, all evaluations of corrosion resistance, workability, and cost were good. That is, it was confirmed that a sufficient corrosion resistance effect was obtained when the thickness of the corrosion-resistant aluminum material 500 was 0.1 mm or more and 10 mm or less. Moreover, it was confirmed that the workability was good when the thickness of the corrosion-resistant aluminum material 500 was 0.1 mm or more and 10 mm or less. Furthermore, it was confirmed that if the thickness of the corrosion-resistant aluminum material 500 is 0.1 mm or more and 10 mm or less, an increase in cost is suppressed.

<Preferred embodiment of the present invention>
Hereinafter, preferred embodiments of the present invention will be additionally described.

(Appendix 1)
According to one aspect of the invention,
An electric wire gripping device for gripping an overhead power transmission line having a strand composed mainly of aluminum in the outermost layer,
A gripping fitting for gripping the overhead power transmission line by a gripping surface along the outer shape of the overhead power transmission line,
An electric wire gripping device is provided in which a corrosion-resistant aluminum material mainly composed of aluminum and having higher corrosion resistance than the base material of the gripping metal is provided so as to cover the gripping surface of the gripping metal.

(Appendix 2)
Preferably, the wire gripping device according to Appendix 1,
The corrosion-resistant aluminum material is in contact with the gripping surface along the shape of the gripping surface of the gripping metal fitting.

(Appendix 3)
Preferably, the wire gripping device according to appendix 1 or 2,
The manganese concentration of the corrosion-resistant aluminum material is not less than 0.1% by weight and not more than 2.0% by weight.

(Appendix 4)
Preferably, in the electric wire gripping device according to attachment 3,
The manganese concentration of the corrosion-resistant aluminum material is 0.2% by weight or more and 1.2% by weight or less.

(Appendix 5)
Preferably, the wire gripping device according to appendix 1 or 2,
The base material of the gripping metal includes aluminum,
The said corrosion-resistant aluminum material consists of aluminum which has a purity higher than the base material of the said holding metal fitting.

(Appendix 6)
Preferably, in the electric wire gripping device according to appendix 5,
The purity of the aluminum of the corrosion-resistant aluminum material is 99.80% by weight or more and 99.95% by weight or less.

(Appendix 7)
Preferably, the wire gripping device according to any one of appendices 1 to 6,
The thickness of the corrosion-resistant aluminum material is not less than 0.1 mm and not more than 10 mm.

(Appendix 8)
Preferably, the wire gripping device according to any one of appendices 1 to 7,
The corrosion-resistant aluminum material is coated on the gripping surface.

(Appendix 9)
Preferably, the wire gripping device according to appendix 8,
The corrosion-resistant aluminum material is configured as a coating film formed on the gripping surface by a thermal spraying method.

(Appendix 10)
Preferably, the wire gripping device according to any one of appendices 1 to 7,
The corrosion-resistant aluminum material is configured as a collar provided along the shape of the gripping surface.

DESCRIPTION OF SYMBOLS 10 Electric wire holding apparatus 100 Overhead power transmission line 200 Main body frame 220 Frame member 240 Corner support part 320 Support arm (connection member, eye metal fitting)
340 Nut 400 Grip bracket (gripping member, clamp part)
410 body 410 gripping portion 412 base 414 gripping portion 414a gripping surface 420 tightening mechanism 422 tightening shaft portion 424 spring 426 bolt 428 case portion 440 engaging portion (hook portion)
450 Hinge shaft 460 Lid portion 460a Holding surface 462 Engagement hole (hook hole)
500, 502 Corrosion resistant aluminum material 510a, 512a, 520a, 522a Corrosion resistant material gripping surface

Claims (6)

An electric wire gripping device for gripping an overhead power transmission line having a strand composed mainly of aluminum in the outermost layer,
A gripping fitting for gripping the overhead power transmission line by a gripping surface along the outer shape of the overhead power transmission line,
An electric wire gripping device provided with a corrosion-resistant aluminum material mainly composed of aluminum and having higher corrosion resistance than a base material of the gripping bracket so as to cover the gripping surface of the gripping bracket.   The electric wire gripping device according to claim 1, wherein the corrosion-resistant aluminum material includes manganese.   The wire gripping device according to claim 2, wherein the corrosion-resistant aluminum material has a manganese concentration of 0.1 wt% or more and 2.0 wt% or less. The base material of the gripping metal includes aluminum,
The electric wire gripping device according to claim 1, wherein the corrosion-resistant aluminum material is made of aluminum having a higher purity than a base material of the gripping metal fitting.   The wire gripping device according to claim 4, wherein the purity of the aluminum of the corrosion-resistant aluminum material is 99.80 wt% or more and 99.95 wt% or less.   The wire gripping device according to any one of claims 1 to 5, wherein a thickness of the corrosion-resistant aluminum material is 0.1 mm or more and 10 mm or less.

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