JP2000329186A - Vibration damper for pole - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a large vibration suppression relative to the vertical vibration by fixing a base end to a fitting face and a material to be fitted to the tip side and providing a pole having the base end and the material to be fitted deviated horizontally and a vibration damping means composed of a collision damper adjacent to the material to be fitted to the pole. SOLUTION: A pole 1 has its base end 12 fixed to a fitting face 11 and a material 2 to be fitted to the tip 13 side and the base end 12 and the material 2 to be fitted are horizontally deviated. A vibration damping means 3 is composed of a vertical collision damper, provided adjacent to the material 2 to be fitted to the pole, stored in a case, and suspended and supported by an elastic body. The vibration damping means 3 performs vertical collision damper operation relative to the vertical vibration of the pole 1 caused by various inputs such as a wind and a vibration. This constitution can improve the vibration resistance strength of the pole by the amplitude reduction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pole vibration control device for poles such as lighting poles, power distribution poles, and mobile phone receiving / transmitting poles against earthquakes, winds, and the like.

[0002]

2. Description of the Related Art A pole may shake greatly due to an earthquake, wind, or traffic vibration, which may cause plastic deformation or fatigue failure. Conventionally, there are two major measures to prevent this.
Can be classified into two types.

[0003] (1) A method of changing the weight, shape and rigidity of the pole to prevent resonance between the natural frequency of the pole and various vibrations serving as excitation sources, and (2) the pole has a vibration suppressing function. In this method, a vibration damping device is attached to alleviate the resonance phenomenon.

The method of changing the natural frequency of (1) is as follows.
Specifically, by changing the pole cross-sectional shape (thickness, diameter, etc.), the design must be changed for each installation location of the pole, which is not practical.

On the other hand, in the case of using the vibration damping device of (2) which has the vibration suppression, the vibration damping device is actually disclosed in Japanese Unexamined Utility Model Publication No. 4-1318.
No. 06 (FIG. 13) or Japanese Utility Model Application Laid-Open No. 4-131804.
As shown in FIG. 14 (FIG. 14), a metal ball 101, a weight body 102 supported by a plurality of small balls 103, and the like are provided inside a pole 100, and vibration energy when the pole 100 shakes is converted into a plurality of weights. Some are converted and absorbed by the collision energy of the body.

However, since the metal spheres 101 and the like are movable only in the horizontal direction, vibration absorption due to collision energy can be expected only in the horizontal direction. Therefore, a high-order vibration mode in which the tip that protrudes substantially horizontally due to wind, traffic vibration, or the like vibrates in the vertical direction, which is often seen in road lighting poles and the like in which L-shaped poles and Y-shaped poles are mainstream, is dominant. In this case, the conventional vibration damping device cannot expect the effect of reducing the vibration due to the addition of damping.

[0007]

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a pole vibration damping device which is unable to cope with the prior art, and which can obtain large vibration suppression against vertical vibration.

In order to achieve the above-mentioned object, this pole vibration damping device solves the conventional problem by a vibration damping device having a structure provided movably in a case for accommodating a collision body.

[0009]

According to a first aspect of the present invention, there is provided a vibration damping device for a pole, wherein a base end portion is fixed to a mounting surface and an object to be mounted is fixed to a distal end side. The pole includes a pole whose attachment is displaced in the horizontal direction, and vibration damping means provided in the vicinity of the pole to be attached to the pole and comprising a vertical collision damper.

According to the first aspect of the present invention, the vibration damping means exerts a vertical collision damper action against the vibration of the pole caused by various inputs such as wind and traffic vibrations, particularly the vertical vibration. Therefore, the vibration reduction strength of the pole is improved by reducing the amplitude. Also, due to its structure, it has excellent long-term durability and weather resistance, and exhibits stable performance over a long period, so that periodic maintenance is unnecessary. Furthermore, since the impact energy is used, a wide range of poles can exhibit a damping effect without depending on the vibration frequency of the pole to be targeted.

According to a second aspect of the present invention, in the pole damper according to the first aspect, the damping means includes a collision body and a case for housing the collision body, and the collision body includes an upper portion and a lower portion of the case. It is supported in the case so as to be able to move up and down so that it can collide with them with a gap.

According to the pole damping device of the second aspect, the same effect as that of the first aspect is obtained.

According to a third aspect of the present invention, in the pole damper according to the second aspect, the collision body has a gap between itself and a peripheral side wall of the case, and the collision body is movable in the horizontal direction so as to collide with the peripheral wall. It is supported within.

According to the third aspect of the invention, there is provided the same effect as that of the second aspect.

According to a fourth aspect of the present invention, there is provided the pole damping device according to the second or third aspect, wherein the colliding body forms a liquid in the hollow container by forming a gap between the liquid upper surface and the upper portion of the hollow container. It is a liquid system vibration means stored.

According to the pole damping device of the fourth aspect, the same effects as those of the second or third aspect can be obtained.

According to a fifth aspect of the present invention, in the pole damping device according to the third or fourth aspect, the peripheral side surfaces of the case are two pairs of parallel surfaces whose opposing directions are substantially orthogonal to each other.

According to the fifth aspect of the present invention, the same effects as those of the third or fourth aspect are obtained.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. That is, the pole damping device includes the pole 1 and the damping means 3.

The pole 1 has a base end portion 12 fixed to a mounting surface 11 and a mounted object 2 fixed to a distal end portion 13 side.
The base end 12 and the mounted object 2 are displaced in the horizontal direction. In the embodiment, a substantially L-shaped pole is used.

The vibration damping means 3 is provided in the vicinity of the object 2 on which the pole 1 is mounted, and comprises a vertical damper. The vibration damping means 3 of the embodiment is attached to the object 2 and includes a collision body 4 and a case 5 for housing the collision body 4. The case 5 is a hollow, substantially cylindrical shape having an upper or inner upper surface 5a, a lower or inner lower surface 5b, and an inner peripheral side surface 5c. The collision body 4 has gaps 14 and 15 with the inner upper surface 5a and the inner lower surface 5b of the case 5, and is supported by the elastic body 6 in the case 5 so as to be able to move up and down so as to collide with them. The elastic body 6 is stretched at four locations at substantially equal intervals in the circumferential direction between the peripheral side wall 5c and the collision body 4 using, for example, a tension coil spring or the like. Hanging in the air.

As described above, the vibration damping means 3 includes the collision body 4
Are stored in a case 5 serving as an outer container, and the collision body 4 is separated from the case 5 by a gap 14 with the inner upper surface 5a and the inner lower surface 5b.
The case 5 is suspended and supported by the elastic body 6, and is arranged to be vertically movable and capable of colliding with the inner upper surface 5 a and the inner lower surface 5 b of the case 5. Therefore, when the pole 1 shakes in a vibration mode in which the vertical displacement of the secondary or higher attachment 2 of the pole 1 is superior due to wind, traffic vibration, or the like, the collision body 4 also vibrates, and the collision The collision is repeated, and a vibration suppressing effect can be obtained by the collision energy.

According to this damping device for a pole, the damping means 3 acts as a vertical collision damper against vibrations of the pole 1 caused by various inputs such as wind and traffic vibrations, particularly vertical vibrations. By reducing the amplitude, the vibration resistance of the pole is improved. In addition, it is structurally excellent in long-term durability and weather resistance, and exhibits stable performance over a long period, so that periodic maintenance is unnecessary. Further, since the impact energy is used, the vibration control effect can be exerted on a wide range of poles 1 without depending on the vibration frequency of the target pole 1.

In the first embodiment, an example in which the collision body 4 is suspended by four elastic bodies 6 has been described. It can be a book.

A second embodiment of the present invention will be described with reference to FIGS. That is, in the first embodiment, the vibration damping device for a pole is the peripheral side surface 5 c of the case 5.
Are two pairs of parallel surfaces whose opposing directions are substantially orthogonal to each other, for example, a substantially rectangular cylindrical shape having a square cross section, the collision body 4 is a disk or a column having a low height, and the elastic body 6 is connected to the inner corner of the case 5. The collision body 4 is connected to the peripheral surface of the collision body 4, and the collision body 4 forms gaps 14 and 15 between the inner upper surface 5a and the inner lower surface 5b of the case 5, and can move up and down so as to be able to collide with them. , And has a gap between the inner peripheral side wall 5c of the case 5 and is supported in the case 5 so as to be movable in the horizontal direction so as to collide with the inner peripheral side wall 5c.

As described above, the collision body 4 is more elastic than the case 5 having a square cross section while maintaining the clearance with the side wall.
, And constitutes a suspended structure 7 having the collision body 4 as a mass point, and is also arranged to be swingable in the horizontal direction.

Due to wind, traffic vibration, or the like, the pole 1 swings at a vibration cycle in which the secondary or higher vibration mode of the pole 1 is predominant, and even if the vertical displacement of the mounted object 2 is predominant, the horizontal displacement is also large. Even if it is remarkable, the suspension structure 7 also vibrates similarly, and the collision with the inner upper surface 5a and the inner lower surface 5b or the inner peripheral side surface 5c of the case 5 is repeated, and the vibration suppression effect can be obtained by the collision energy. it can. At this time, the collision body 4 and the case 5 do not collide with each other on the surface,
The collision object 4 in the case 5 by colliding with a line or a point
Can be prevented from rotating, and the effect of suppressing vibration can be reliably obtained.

Other features are the same as those of the first embodiment.
The same applies to the number of elastic bodies.

A third embodiment of the present invention will be described with reference to FIGS. That is, in the second embodiment, the pole damping device has a recess 4a formed in the lower surface of the collision body 4 and an elastic body 6 interposed between the recess 4a and the inner lower surface 5b of the case 5 in the second embodiment. The collision body 4 is mounted on the inner lower surface 5b of the case 5 via the elastic body 6 so as to be able to collide.

Although the elastic body 6 is interposed between the inner lower surface 5b of the case 5 and the recess 4a of the collision body 4, the elastic body 6 is interposed between the inner upper surface 5a of the case 5 and the recess formed on the upper surface of the collision body 4. The colliding bodies 4 may be suspended so as to be able to collide with up and down and left and right by being connected.

Other configurations, operations and effects are the same as those of the second embodiment.
This is the same as the embodiment described above, and the number of elastic bodies is also the same.

A fourth embodiment of the present invention will be described with reference to FIGS. That is, in the first embodiment, the pole damper is configured such that the collision body 4 is
A liquid damping means is provided in which the liquid 9 is stored in the gap 9 between the liquid upper surface and the upper portion of the hollow container 19, that is, the inner upper surface. The liquid 9 is a viscous liquid. Since the vibration frequency of the liquid 9 is substantially equal to the primary natural frequency of the pole 1, the vibration frequency of the liquid 9 is the same as that of the pole 1 and 4 A large vibration suppression effect can be obtained by oscillating the oscillating mass (based on the Hausner theory) of the liquid 9 at a timing shifted in phase by one-half cycle.

According to this operation, in the case where the primary natural frequency of the pole 1 in which the viscous liquid accommodated in the liquid vibration means oscillates is a remarkable vibration, in addition to the vibration suppression effect of the liquid vibration means alone. Further, since the effect of the collision energy is also added, greater vibration suppression can be obtained.

The rest is the same as the first embodiment,
The same applies to the number of elastic bodies.

A fifth embodiment of the present invention will be described with reference to FIGS. That is, in the vibration damping device for a pole, in the second embodiment, the collision body 4 puts the liquid 9 in the hollow container 19 as shown in the fourth embodiment and the liquid upper surface and the upper surface of the hollow container 19. The liquid system vibration means accommodated with a gap 8 between them.

The other points are the same as those of the second embodiment.
The liquid vibration means is the same as in the fourth embodiment, and the number of elastic bodies is also the same.

A sixth embodiment of the present invention will be described with reference to FIGS. That is, in this third embodiment, in the third embodiment, in the third embodiment, the collision body collides the liquid 9 into the hollow container 19 as shown in the fourth embodiment. This is a liquid system vibration means stored with a gap 8 between it and the upper surface.

Other features are the same as those of the third embodiment.
In addition, the liquid system vibration means is the same as in the fourth embodiment, and the number of elastic bodies and the suspension of the collision body with the elastic bodies are also the same as in the third embodiment.

[0039]

According to the first aspect of the present invention, the vibration damping means is provided with a vertical collision damper in response to a vertical vibration caused by various inputs such as wind and traffic vibration. Since it acts, the vibration resistance of the pole is improved by reducing the amplitude. Also, due to its structure, it has excellent long-term durability and weather resistance, and exhibits stable performance over a long period, so that periodic maintenance is unnecessary. Furthermore, since the impact energy is used, a wide range of poles can exhibit a damping effect without depending on the vibration frequency of the pole to be targeted.

According to the pole damping device of the second aspect, the same effect as that of the first aspect is obtained.

According to the pole damper of the third aspect, the same effect as that of the second aspect can be obtained.

According to the pole damping device of the fourth aspect, the same effects as those of the second or third aspect can be obtained.

According to the pole damping device of the fifth aspect, the same effects as those of the third or fourth aspect can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view of a first embodiment of the present invention.

2A and 2B show the vibration damping means, wherein FIG.
(B) is a longitudinal sectional view.

FIG. 3 is a front view of the second embodiment.

4A and 4B show the vibration damping means, wherein FIG.
(B) is a longitudinal sectional view.

FIG. 5 is a front view of the third embodiment.

6A and 6B show the vibration damping means, wherein FIG.
(B) is a longitudinal sectional view.

FIG. 7 is a front view of a fourth embodiment.

8A and 8B show the vibration damping means, and FIG.
(B) is a longitudinal sectional view.

FIG. 9 is a front view of the fifth embodiment.

10A and 10B show the vibration damping means, wherein FIG.
(B) is a longitudinal sectional view.

FIG. 11 is a front view of the sixth embodiment.

12A and 12B show the vibration damping means, and FIG.
(B) is a longitudinal sectional view.

13A and 13B show a conventional example, in which FIG. 13A is a longitudinal sectional view and FIG. 13B is a transverse sectional view.

14A and 14B show another conventional example, in which FIG.
(B) is a cross-sectional view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Pole 2 Attached object 3 Vibration suppression means 5 Case 5a Inner upper surface 5b Inner lower surface 5c Inner peripheral side surface 8 Gap 9 Liquid 11 Mounting surface 12 Base end 13 Top end 14, 15 Gap 19 Hollow container

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Takamasa Ikeda 1048 Kadoma, Kazuma, Osaka Prefecture Matsushita Electric Works F-term (reference) 2D064 AA12 AA22 HA15 3J048 AA07 AD06 BF04 BF11 DA01 DA10 EA38

Claims (5)

[Claims] 1. A pole having a base end portion fixed to a mounting surface and an object to be mounted fixed to a distal end side, wherein the base end and the object to be mounted are displaced in a horizontal direction. A damping device for a pole, comprising: damping means provided in the vicinity of the mounting object and comprising a vertical collision damper. 2. The vibration damping means includes a collision body and a case for accommodating the collision body, and the collision body has a gap between an upper portion and a lower portion of the case and is vertically movable so as to be able to collide with the case. The pole damping device according to claim 1, which is supported in the case. 3. The vibration damping device for a pole according to claim 2, wherein the collision body has a gap with a peripheral side wall of the case, and is supported in the case so as to be able to collide with the peripheral body so as to be movable in a horizontal direction. . 4. The pole according to claim 2, wherein the collision body is a liquid damping unit that stores a liquid in a hollow container with a gap between a liquid upper surface and an upper portion of the hollow container. Vibration control device. 5. The peripheral side surface of the case is a pair of parallel surfaces whose opposing directions are substantially orthogonal to each other.
The described vibration damping device for a pole.