JPH0623147Y2 - Electric wire snow prevention device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an electric wire snow accretion prevention device for preventing an accident of snow accretion on an overhead wire.

[Conventional technology]

When snow occurs on the overhead wire, the snow mass rotates around the wire while sliding along the groove on the surface of the wire due to its eccentric moment, and the wire itself twists in the same direction due to the rotation of the snow mass. Due to the rotation of the snow accretion on the surface of the electric wire and the twisting of the electric wire itself, the snow accretion gradually develops while rotating around the electric wire and becomes a snow-covered snow. A steel tower collapse accident occurs.

In order to prevent this snow accretion accident, as shown in FIG. 5, a damper having a weight 11 attached to an electric wire gripping clamp 10 is attached to the overhead wire c to prevent an eccentric moment due to snow on the overhead wire c. By acting as a drag moment, it prevents twisting of the wire itself, prevents rotation of the surface of the wire for snow accretion, prevents the development of snow accretion, and causes it to drop by its own weight before it develops into large snowflakes. It prevented the disconnection of overhead power lines and the accident of tower collapse.

In addition, when snow is formed on the overhead wire and a cross wind is received, lift force is generated and galloping vibration with a vibration cycle of about 2 to 10 seconds occurs on the wire, causing a disconnection accident, etc. In order to suppress, a damper in which a heavy weight iron ball and oil are contained in a cylindrical container, such as the galloping damper disclosed in JP-A-51-10393,
When the cylindrical container is arranged and installed so that it is in the vibration direction of the wire, and the wire causes galloping vibration, the iron ball inside the cylindrical container rolls in the container in the direction opposite to the wire vibration direction due to inertia. However, when the iron ball approaches the container end, the rolling speed of the iron ball is reduced due to the viscous resistance of the oil, which suppresses the rocking of the cylindrical container that vibrates in the vibration direction of the electric wire and suppresses the galloping vibration of the electric wire. Those that suppress are known.

[Problems to be solved by the invention]

Like the conventional damper shown in FIG. 5, in the method of preventing the twisting of the overhead wire due to the snow due to the drag moment of the damper itself attached to the overhead wire, the drag moment of the damper is caused by the snowfall of the wire. If the eccentric moment cannot be met, the electric wire will be twisted, and it will not be possible to prevent snow accretion from developing on the snow, and it will not be possible to prevent disconnection of the overhead electric wire and accidents of the tower collapse.

Also, like the disclosed galloping damper, a damper that suppresses the movement of the container that vibrates together with the electric wire by decelerating with the viscous resistance of oil when the iron ball rolling inside the container approaches the end of the container , Which suppresses galloping vibration having a vibration period of about 2 to 10 seconds and suppresses a very slow twisting phenomenon in which the operation time of twisting an overhead wire due to the development of snow is 1 to 2 hours. Therefore, if the wire twists slowly due to snow accretion, the galloping damper will also go around the wire together, which will not serve the purpose of galloping suppression, and even if the container tilts due to the twisting of the wire, The rolling of the iron ball inside the container slows down due to the viscous resistance of the oil when it approaches the container end, it does not collide with the container end wall and does not give a shock, so it is possible to drop snow accretion on the wire. There is a problem that can not be.

The present invention solves the above-mentioned problems, and when the overhead wire that has snowed is twisted at a predetermined angle or more, the wire is impacted to force the snow to fall, thereby fixing the overhead wire. It is an object of the present invention to provide an electric wire snow accretion prevention device that prevents a wire breakage and a tower collapse accident due to snow.

[Means for solving problems]

In order to achieve the above-mentioned object, the electric wire snow accretion prevention device of the present invention is provided with a spherical locking recess 2d on the bottom surface of the inner hollow passage 2a of the hollow cylindrical body 2 on one end wall portion 2b side. The impact movable sphere 3 is housed in the rolling itself in 2a, and the sphere locking recess 2d is fitted and locked, and the hollow cylindrical body 2 has its axial direction in the wire holding circular hole portion 1b of the wire holding clamp 1. Is attached to the clamp lower end 1a so as to be orthogonal to the axial center direction of the
With the end wall 2b on the 2d side facing the twisting direction due to snow accretion of the overhead wire c, the wire hole circular hole 1b of the clamp 1 is attached to the overhead wire, and the hollow wire is twisted due to twisting. Due to the inclination of the cylindrical body 2, the impact movable sphere 3 becomes a spherical body locking concave portion.
It escapes from 2d and rolls and falls in the inner hollow passage 2a, and the other end wall
It is configured to impact 2c.

[Action]

The movable sphere 3 for impact is always fitted and locked in the sphere locking recess 2d when snow does not occur on the electric wire.

When the electric wire tries to twist due to snow accretion, the hollow cylindrical body 2 accommodating the heavy impact movable sphere 3 acts as a drag moment against the eccentric moment of snow accretion to prevent the electric wire from twisting and develop snow accretion. It prevents the snow from falling and falls naturally before it develops into a large snow cylinder.

When the amount of snow accreted is too large to counter the eccentric moment and the electric wire is twisted, the clamp 1 is also rotated around the electric wire by the twisted angle and the hollow cylindrical body 2 is inclined and movable for impact. The end wall 2b on the side of the spherical body locking recess 2d in which the spherical body 3 is fitted and locked rises upward, and the impact movable spherical body 3 escapes from the spherical body locking recess 2d and rolls in the internal hollow passage 2a. It falls dynamically and collides strongly with the other end wall 2c to give a shock. This shock is transmitted to the electric wire and snow is forced to drop.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a cross-sectional view showing the main part of one embodiment of an electric wire snow accretion prevention device of the present invention, 1 is a clamp for holding an overhead wire, 1a is a lower end thereof, and 1b is an upper wire holding circle for holding the wire. It is a hole.

Reference numeral 2 is a hollow cylindrical body, and both ends of the inner hollow passage 2a are connected to the end wall portion 2
It is formed into a cylindrical shape closed by b and 2c, and a spherical engagement recess 2d is provided on the bottom surface of the inner hollow passage 2a on one end wall 2b side.

Reference numeral 3 is a movable spherical body for impact formed in a spherical shape having a perfect weight or an elliptic spherical shape and having a predetermined weight. The impact movable spherical body 3 is housed in the internal hollow passage 2a in the hollow cylindrical body 2 described above,
When the hollow cylindrical body 2 is attached to the overhead wire and snow does not occur in the used state, the hollow cylindrical body 2 is always fitted and locked in the spherical body locking recess 2d. When snow is generated on the overhead wire and the hollow cylinder 2 tilts around the wire by a predetermined angle (90 ° or less) as the wire is twisted, the movable sphere 3 for impact escapes from the spherical recess 2d and the internal hollow passage 2a. It falls inside and collides with the other end wall portion 2c, and the impact is applied to the overhead wire to drop snow accretion.

A hollow cylindrical body 2 containing the impact movable sphere 3 as described above.
Is attached to the lower end portion 1a of the clamp 1 in a state where its axial direction is orthogonal to the axial direction of the electric wire grasping circular hole portion 1b of the electric wire grasping clamp 1.

As described above, the electric wire holding circular hole portion 1b of the clamp 1 having the hollow cylindrical body 2 attached to the lower end portion 1a is attached by holding the overhead wire c. As shown in FIG. 2, the attachment to the overhead wire c is performed by the end wall portion on the sphere locking recess 2d side where the impact movable sphere 3 in the hollow cylindrical body 2 is fitted and locked.
Install by arranging the 2b side on the tip side in the twisting direction due to snow accretion of the overhead wire, and when the electric wire does not snow, the impact movable sphere 3 is fitted and locked in the sphere locking recess 2d at all times. Attach 1 with a slight inclination.

As described above, the electric wire snow accretion prevention of the present invention attached to the overhead wire is such that the movable sphere 3 for impact is fitted and locked in the sphere locking recess 2d in the hollow cylinder 2 at all times when snow does not occur. When snow is generated on this wire and the wire is about to be twisted due to its eccentric moment, the hollow cylindrical body 2 accommodating the impact movable sphere 3 having a certain weight acts as a drag moment against the eccentric moment of snow accretion. However, it prevents the development of snow accretion by preventing the twisting due to snow accretion of the electric wire, so that the snow accretion naturally falls before it develops into a large tube snow.

When the amount of snow accretion on the electric wire is large and the eccentric moment of the snow accretion cannot be countered and the electric wire is twisted, the clamp 1 rotates around the electric wire together with the electric wire, and as shown by the chain line in FIG. A spherical body locking recess in which the cylindrical body 2 is inclined at a predetermined angle (90 ° or less) and the impact movable spherical body 3 is fitted and locked.
The end wall portion 2b side on the 2d side goes up in the twisting direction of the electric wire.

When the impact movable sphere 3 fitted and locked in the sphere locking recess 2d rises upward, the impact movable sphere 3 escapes from the sphere locking recess 2d and rolls in the internal hollow passage 2a. Then, it falls to the position indicated by 3'in FIG. 2 and strongly collides with the other end wall portion 2c of the hollow cylindrical body 2 to exert a large impact. This shock is transmitted to the electric wire, and even if the snow on the electric wire is greatly developed, the shock causes the electric wire to be forcibly dropped from the electric wire, which prevents a snow accretion accident. When the snow on the electric wire falls, the eccentric moment due to the snow disappears and the twisting of the electric wire disappears, and the clamp 1 that has been rotating upward around the electric wire descends to its original position and is a hollow cylindrical body. 2 also returns to the original position, and the impact movable sphere 3 also returns to the state of rolling in the internal hollow passage 2a to the original position and being locked in the sphere locking recess 2d. Since this operation is repeated every time snowfall increases, accidents due to snowfall can be prevented.

FIG. 3 shows an embodiment in which the hollow cylindrical body 2 is attached to the clamp 1 in an inclined manner, and FIG. 4 shows the internal hollow passage 2a provided in an inclined manner with respect to the hollow cylindrical body 2. The same reference numerals as those in FIG. 1 indicate the same parts. Also, two hollow cylindrical bodies 2 accommodating the impact movable spheres 3 may be used. In this case, it is preferable that the two hollow cylinders are fixed to the lower end portion of the clamp so as to have a V shape when viewed from the direction shown in FIG. By using two hollow cylinders in this way, it is possible to prevent snow accretion as described above regardless of the direction of the eccentric moment due to snow accretion, and the balance when attached to electric wires is also good. Get better

[Effect of device]

As described above, according to the present invention, the spherical engaging recess is formed on the bottom surface of one end of the inner hollow passage of the hollow cylindrical body that is attached to the lower end of the clamp so as to be orthogonal to the axial direction of the electric wire grasping hole of the electric wire grasping clamp. Is provided to lock the movable ball for impact that can be freely rolled, and the end wall portion side of the hollow cylinder spherical recess for locking the ball is attached to the aerial wire in the twisting direction of the aerial wire. Even if a large amount of snow is generated on the electric wire, the impact movable sphere is made to escape from the sphere locking recess by the inclination of the hollow cylinder due to the twisting caused by snow accretion and impacts the end wall of the hollow cylinder. It is possible to prevent snowfall accidents because snowfall is forcibly dropped by the impact of the impact movable sphere.

Even if the snow is not so large and the impact movable sphere is fitted and locked in the sphere locking recess in the hollow cylinder, if the wire is twisted due to snow accretion, the impact movable sphere will be heavy. Since the hollow cylindrical body containing the sphere acts as a drag moment to prevent the twisting of the electric wire and prevent the development of snow accretion, it is possible to prevent a snow accretion accident.

[Brief description of drawings]

FIG. 1 is a sectional view of the essential portions of a first embodiment of the present invention, FIG. 2 is an operation explanatory diagram, FIG. 3 is a sectional view of the essential portions of the second embodiment, and FIG.
FIG. 5 is a cross-sectional view of a main part of the third embodiment, and FIG. 5 is a view of a conventional example. 1: Clamp 1a: Lower end 1b: Circular hole for electric wire grip 2: Hollow cylindrical body 2a: Inner hollow passage 2b, 2c: End wall 2d: Sphere locking recess 3: Movable sphere for impact c: Overhead electric wire

Claims (1)

[Scope of utility model registration request] 1. A spherical locking recess (2d) is provided on the bottom surface of the inner hollow passage (2a) of the hollow cylindrical body (2) on the side of one end wall (2b), and the spherical hollow (2a) is transferred to the inner hollow passage (2a). Movable sphere for impact housed freely (3)
Is fitted and locked in the spherical body locking recess (2d), and the hollow cylindrical body (2) is orthogonal to the axial direction of the electric wire holding circular hole (1b) of the clamp (1) and the clamp lower end (1a ), And the end wall portion (2b) of the hollow cylindrical body (2) on the side of the spherical body locking recess (2d) is directed toward the twisting direction due to snow accretion of the overhead wire (c) (1).
The electric wire gripping circular hole (1b) is attached to the overhead wire (c), and the impact movable sphere (3) is slid by the inclination of the hollow cylindrical body (2) due to the twisting of the snow-covered wire. It escapes from (2d) and rolls and falls in the inner hollow passage (2a), and the other end wall (2
An electric wire snow accretion prevention device characterized by impacting c).