JP2011193569A - Straight sleeve protective device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a straight sleeve protective device which prevents a straight sleeve from easily leaving a transmission line. <P>SOLUTION: The protective device 10 includes a wire net 1 and a coupling rod 2. For the wire net 1, a flexible wire 1w is braided. The wire net 1 surrounds a pair of transmission lines 7 and 7 extending to both sides of the straight sleeve 6 such that the straight sleeve 6 is arranged at roughly the center. The coupling rod 2 has engaging parts 1a and 1b, with which the wire net 1 can engage at both edges, and also couples both edges of the wire net 1 so that the pair of crossing engaging parts 1a and 1b may not separate. The wire net 1 is drawn out along the pair of transmission lines 7 and 7 from a state that the wire net 1 has shrunk in the axial direction of the straight sleeve 6, whereby the wire net 1 shrinks in diameter to hold the straight sleeve 6 and the pair of transmission lines 7 and 7. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a linear sleeve protection device. In particular, the present invention relates to a structure of a device that protects a straight sleeve, which is a straight connection of power transmission lines installed between steel towers or between power poles, from being easily detached from the power transmission lines.

  The straight sleeve is generally made of a conductive metal tube such as copper or aluminum, and can connect the separated electric wires in a straight line. In the compression type linear sleeve, after the ends of the electric wires are inserted and abutted from both ends of the linear sleeve, the linear sleeves are compressed in the radial direction, and the divided electric wires can be connected both electrically and mechanically.

  Since the straight sleeve applied to the overhead line (transmission line) is used outdoors in an exposed environment, the electrical resistance of the straight sleeve increases due to secular change due to factors such as wind and rain. There was a problem that performance deteriorated.

  In addition, there is a problem that the electrical resistance of the linear sleeve increases and heat is generated, and the transmission line is fatigued due to repeated load due to vibration, and the mechanical strength (tensile strength) of the transmission line is deteriorated. For this reason, electrical work for exchanging the deteriorated linear sleeve and the power transmission line connected to the linear sleeve is performed.

  By the way, this replacement work of transmission lines requires a lot of time and labor, but on the other hand, improvement of the operating rate of electric power equipment is also demanded. That is, it has been required to replace the power transmission line including the straight sleeve without stopping power transmission.

  In order to eliminate the above problems, a bypass clamp that can complement electrical performance and mechanical performance as a power transmission line during a period until the power transmission line is replaced is disclosed (for example, Patent Documents). 1).

  In the bypass clamp according to Patent Document 1, gripping clamps are arranged on both sides of a compression sleeve for compressing and connecting power transmission lines, and the gaps are electrically and mechanically connected therebetween. In addition, the bypass clamp according to Patent Document 1 grips the power transmission lines on both sides of the compression sleeve with the gripping clamps, and connects the gripping clamps with an aluminum alloy rod to electrically and mechanically connect the power transmission lines. . Furthermore, the bypass clamp according to Patent Document 1 has a roughened surface on the inner surface that grips the power transmission line of the grip clamp.

JP 2002-101538 A

  However, the bypass clamp according to Patent Document 1 forms a grip clamp by a pair of two split grip clamps each having a half-divided cylindrical shape. These two split grip clamps are tightened with tightening bolts and nuts to grip the power transmission line.

  Therefore, in the bypass clamp according to Patent Document 1, it is considered that the fastening force between the tightening bolt and the nut does not decrease as long as it is a period until the transmission line is replaced. Or there is concern that the nut will loosen and the fastening force between the tightening bolt and the nut will decrease. That is, there is a problem that it is difficult to hold a pair of power transmission lines extending on both sides of the linear sleeve.

  In addition, the bypass clamp according to Patent Document 1 performs roughing on the inner surface of these two split grip clamps to increase the frictional force with the power transmission line, thereby improving the gripping power of the power transmission line. Yes. However, the split grip clamp only grips the power transmission line only partially, and it is difficult to grip a pair of power transmission lines extending on both sides of the linear sleeve only with these partial frictional forces. There is a problem that.

  Inventing a device that protects a straight sleeve that connects power lines installed between steel towers or between power poles so that they are not easily detached from the power lines, extends the life of the power lines and increases the frequency of replacement work. Can also be reduced. The above can be said to be the subject of the present invention.

  The present invention has been made in view of such a problem, and an object of the present invention is to provide a linear sleeve protection device that protects a linear sleeve in which a power transmission line is linearly connected from being easily detached from the power transmission line.

  The present inventors have found that this problem can be solved by grasping a pair of power transmission lines extending on both sides of the linear sleeve so as to be wrapped with a wire net braided by a flexible wire, and based on this, The inventors have invented the following new linear sleeve protection device.

  (1) The linear sleeve protection device according to the present invention includes a pair of power transmission lines that are linearly connected by a linear sleeve and extend on both sides of the linear sleeve. A wire net that is braided with a flexible wire and that is surrounded by a substantially rectangular wire net, and engaging portions that can be engaged with each other so that the wire net can maintain a cylindrical shape. And a long connecting rod that connects both ends of the wire net so that the pair of intersecting engaging portions are not separated from each other, and the wire net contracts in the axial direction of the linear sleeve. The wire net is stretched along the pair of power transmission lines from the state, the diameter of the wire net is reduced, and the linear sleeve and the pair of power transmission lines are gripped. .

  (2) The wire of the wire net may be made of conductive fibers.

  (3) It is preferable to further include a pair of clamps that grip both ends of the connecting rod and both ends of the wire net with the pair of power transmission lines.

  The linear sleeve protection device according to the present invention reduces the diameter of the wire net and grips the linear sleeve and the pair of power transmission lines, so that the linear sleeve can be protected from being easily detached from the power transmission line.

It is a front view which shows the structure of the linear sleeve protection apparatus by one Embodiment of this invention, and has shown the principal part by the longitudinal cross-section. It is a perspective view which shows the structure of the linear sleeve protection apparatus by the said embodiment, and is a state figure before a wire net is extended along a pair of power transmission line. It is a perspective view which shows the structure of the linear sleeve protection apparatus by the said embodiment, and is a state figure by which the wire net was extended along a pair of power transmission line. FIG. 4A is a development view of a wire net provided in the linear sleeve protection device according to the embodiment, FIG. 4A is a state diagram before the wire net is stretched along a pair of power transmission lines, and FIG. It is the state figure by which the net | network was extended along a pair of power transmission line.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
[Configuration of linear sleeve protection device]
First, a configuration of a linear sleeve protection device according to an embodiment of the present invention will be described. FIG. 1 is a front view showing a configuration of a linear sleeve protection device according to an embodiment of the present invention, and shows a main part in a longitudinal section.

  FIG. 2 is a perspective view showing the configuration of the linear sleeve protection device according to the embodiment, and is a state diagram before the wire net is stretched along a pair of power transmission lines. FIG. 3 is a perspective view illustrating a configuration of the linear sleeve protection device according to the embodiment, and is a state diagram in which a wire net is stretched along a pair of power transmission lines.

  Referring to FIGS. 1 to 3, a linear sleeve protection device (hereinafter abbreviated as a protection device) 10 according to an embodiment of the present invention includes a wire net 1 and a long connecting rod 2 that are deployed in a substantially rectangular shape. ing. The protective device 10 includes a pair of clamps 3 and 3.

  Referring to FIGS. 1 to 3, the straight sleeve 6 linearly connects the power transmission lines 7 installed between the steel towers or between the utility poles. The illustrated linear sleeve 6 is a compression type linear sleeve. And after inserting the end of the power transmission line 7 from the both pipe ends of the straight sleeve 6 and making it face, the straight sleeve 6 is compressed to radial direction. Thus, the straight sleeve 6 connects the divided power transmission line 7 both electrically and mechanically.

  Referring to FIGS. 1 to 3, the wire net 1 in an unfolded state is braided so that a plurality of flexible wires 1 w intersect. The wire 1w may be a conductive fiber such as steel fiber or carbon fiber, or may be an insulating fiber such as polyester or aramid fiber, and the conductive fiber is coated with an insulating material. It may be a composite fiber. Further, conductive fibers and insulating fibers may be braided alternately.

  Referring to FIG. 2, a pair of cylindrical engaging portions 1 a and 1 a are provided intermittently on one end edge of the wire net 1 in a deployed state. A pair of cylindrical engaging portions 1b and 1b are provided intermittently on the other edge of the wire net 1 in the unfolded state. As an entity, the end portions of the wires 1w are wound around these engaging portions 1a and 1b and fixed to their own wires 1w.

  Referring to FIG. 2, the wire net 1 is bent from a flat developed state. And this wire net 1 engages so that the engaging part 1a and the engaging part 1b may cross | intersect, and can maintain a cylindrical shape. When the connecting rod 2 is inserted into the openings provided in the engaging portions 1a and 1b, both ends of the wire net 1 can be connected so that the pair of intersecting engaging portions 1a and 1b are not separated from each other.

  Next, the configuration of the protection device 10 will be supplemented while explaining the assembly procedure of the protection device 10 according to the embodiment. First, referring to FIG. 2, a pair of power transmission lines 7 extending on both sides of the linear sleeve 6 so that the linear sleeve 6 is disposed substantially in the center with the wire net 1 contracted in the axial direction of the linear sleeve 6. • Curve and enclose the wire net 1 in a flat unfolded state within a range of a predetermined section 7.

  Next, referring to FIG. 2, the connecting rod 2 is inserted into the openings provided in the engaging portions 1a and 1b. Then, both end edges of the wire net 1 are connected. Next, as shown in FIG. 1 or FIG. 3, when the wire net 1 is stretched along the pair of power transmission lines 7, 7, the wire net 1 is reduced in diameter, and the linear sleeve 6 and the pair of power transmission lines 7.・ 7 can be gripped.

  Referring to FIG. 1 or FIG. 3, the protection device 10 according to the embodiment further includes a pair of clamps 3. In the clamp 3, one end portions of the pair of semicircular arc plates 31 and 31 are connected to each other by a hinge 3h so as to be freely opened and closed. Then, both ends of the connecting rod 2 and both ends of the wire net 1 are surrounded from the state in which the clamp 3 is opened. Next, by fixing the other ends of the pair of semicircular arc plates 31 and 31 with a fastener such as a screw 3n, both ends of the connecting rod 2 and both ends of the wire net 1 are connected to the pair of power transmission lines 7 and 7 respectively. Can be gripped.

[Operation of linear sleeve protection device]
Next, the operation and effect of the protection device 10 according to the embodiment will be described. FIG. 4 is a development view of the wire net provided in the linear sleeve protection device according to the embodiment, and FIG. 4A is a state diagram before the wire net is stretched along a pair of power transmission lines, FIG. ) Is a state diagram in which the wire net is stretched along a pair of power transmission lines.

  Referring to FIGS. 1 to 3, when the protection device 10 stretches the wire net 1 along the pair of power transmission lines 7, 7, the wire net 1 is reduced in diameter, and the linear sleeve 6 and the pair of power transmission lines 7.・ 7 can be gripped.

  Referring to FIGS. 1 to 3, the protective device 10 is in close contact so that the flexible wire 1 w bites into the outer periphery of the power transmission line 7, so that the frictional resistance can be increased, and the pair of power transmission lines 7, 7 is a straight sleeve. It is possible to withstand the force (pulling force) that separates from 6. Further, the protection device 10 can securely hold the pair of power transmission lines 7 and 7 by bringing the wire net 1 into close contact with the pair of power transmission lines 7 and 7 extending on both sides of the linear sleeve 6 in an appropriate section.

  Referring to FIG. 1 or FIG. 3, the protection device 10 further includes a pair of clamps 3, 3 that grip both ends of the connecting rod 2 and both ends of the wire net 1 with a pair of power transmission lines 7, 7. The gripping force of the wire net 1 can be increased.

  Referring to FIG. 4A, in a state before the wire net 1 is stretched, the logarithmic angle α of the axis Q of the pair of power transmission lines 7 and 7 that is an angle at which the plurality of wires 1w intersect is 90 It has an obtuse angle of more than 60 degrees

  On the other hand, referring to FIG. 4B, in a state where the wire net 1 is stretched, the logarithmic angle β of the axis Q of the pair of power transmission lines 7 and 7, which is an angle at which the plurality of wires 1w intersect, The acute angle is smaller than the diagonal angle α. The angle at which the plurality of wires 1w intersect is more resistant to the force (pulling force) that causes the pair of power transmission lines 7 and 7 to move away from the linear sleeve 6 in accordance with the “symmetric angle α” to the “symmetric angle β”. It is estimated that

  Referring to FIGS. 1 to 3, the protection device 10 according to the embodiment employs a structure in which the flexible wire 1 w is extended and closely attached to the power transmission line 7. Afford. The protection device 10 according to the embodiment complements the electrical performance of the power transmission line 7 even when the electrical resistance of the straight sleeve 6 increases by configuring the wire 1w of the wire net 1 with conductive fibers. it can.

  Since the protection device 10 according to the embodiment reduces the diameter of the wire net 1 and grips the linear sleeve 6 and the pair of power transmission lines 7, 7, it is possible to protect the linear sleeve 6 from being easily detached from the power transmission line 7. it can. And the lifetime of the power transmission line 7 is extended, and the frequency of replacement work can also be reduced.

  The protective device 10 according to the embodiment has been described with respect to a power transmission line installed between steel towers or between utility poles, but can also be applied to a lead-in wire using a straight sleeve, and can also be applied to a general electric wire. Wide application range. The linear sleeve 6 according to the embodiment is a compression-type linear sleeve, but a linear sleeve other than the compression-type linear sleeve can also be applied.

  The linear sleeve protection device according to the present invention is not limited to the illustrated embodiment. For example, the engaging portions 1a and 1b formed in a cylindrical shape may be hook-shaped engaging portions that invert the ends of the wires 1w in a U-shape, and are formed by intersecting hook-shaped engaging portions. The connecting rod 2 can be inserted into the part to connect both ends of the wire net 1.

DESCRIPTION OF SYMBOLS 1 Wire net 1a * 1b Engagement part 1w Wire 2 Connecting rod 6 Straight sleeve 7 Power transmission line 10 Protection device (straight sleeve protection device)

Claims (3)

A flexible wire is braided that is connected in a straight line by a straight sleeve and surrounds a pair of power transmission lines extending on both sides of the straight sleeve in a range of a predetermined section so that the straight sleeve is disposed substantially in the center. A wire net with a substantially rectangular deployment state,
Both ends of the wire net have engaging portions that can be engaged with each other at both ends of the wire net so that the wire net can maintain a cylindrical shape, and the pair of intersecting engaging portions are not separated from each other. A long connecting rod for connecting the edges,
The wire net is stretched along the pair of power transmission lines from the state in which the wire net contracts in the axial direction of the linear sleeve, and the diameter of the wire net is reduced to grip the linear sleeve and the pair of power transmission lines. Straight sleeve protection device.   The linear sleeve protection device according to claim 1, wherein a wire of the wire net is made of conductive fiber.   The linear sleeve protection device according to claim 1 or 2, further comprising a pair of clamps for gripping both ends of the connecting rod and both ends of the wire net by the pair of power transmission lines.

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