JP2008039153A - Vibration damping device and erecting member superior in vibration damping performance - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vibration damping device and an erecting member superior in vibration damping performance, capable of effectively coping with vibration with a frequency varying over a wide range from a low frequency up to a high frequency regardless of the direction of the vibration. <P>SOLUTION: This vibration damping device 1 is composed of a vertical hollow body 10 suspending a suspending member inside. The vibration damping device and the erecting member superior in vibration damping performance are characterized in that the axis of the suspending member coincides with the axis of the vertical hollow body, and the suspending member is composed of a linear upper suspending member such as a wire 9 and a lower suspending member formed by connecting a plurality of metallic bodies 8. In the erecting member superior in vibration damping performance, there are a case of imparting the vibration damping performance by installing the vibration damping device outside or inside the erecting member, and a case of imparting the vibration damping performance to the erecting member itself by directly suspending the suspending member inside the vertical hollow body being the erecting member. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vibration damping device and a standing member excellent in vibration damping performance. Specifically, the present invention relates to a vibration control device used for a standing member such as an illumination column, a sign column, a signal column, and the like, which is erected on a road, a bridge, and the like, and a standing member having excellent vibration damping properties.

  A standing member such as an illumination column, a sign column, or a signal column installed on a road or a bridge may shake due to a resonance phenomenon caused by a wind, an earthquake, a road surface vibration caused by traveling of a vehicle, or the like. When these standing members swing, the standing members are easily damaged by the swing, and the damage is promoted. In addition, there is a problem that the life of the instrument attached to the standing member is shortened due to the generated vibration. Further, in the case of the illumination column, there is a problem that the illumination light is shaken and the person feels uncomfortable.

In order to prevent the standing member from shaking due to such a resonance phenomenon,
(a) A method of changing the natural frequency by changing the weight, shape and rigidity of the standing member,
(b) A method of providing a physical pendulum and a contact tool inside the standing member and having a vibration damping effect by causing the physical pendulum to collide with the contact tool during vibration,
However, each has already been proposed.

  However, although the method (a) has a damping effect for a specific frequency, it cannot cope with fluctuations in which the excitation cycle and frequency fluctuate variously, such as fluctuations caused by wind. As a result, the degree of freedom in the material design of the standing member is reduced. In addition, in the method (b) above, in addition to not being able to cope with fluctuations in which the excitation cycle and frequency fluctuate variously, in order to increase the vibration damping effect, the physical pendulum and the abutment tool must be larger than a certain size. It is necessary to be safe. For this purpose, a storage space is required, which also reduces the degree of freedom in designing the standing member.

  Patent Document 1 describes a vibration damping device that responds to fluctuations in the frequency in light of such problems of the prior art.

  That is, a steel chain or wire is suspended with a non-fixed free vibration part inside the vertical hollow body, and the distance between the steel chain or wire and the inner wall of the vertical hollow body is maintained equivalent. A vibration damping device is provided, and this vibration damping device is attached to the outside or the inside of the vertical erected member, thereby attenuating the vibration caused by the vibration applied to the vertical erected member.

  FIG. 4 shows an example of the vibration damping device described in Patent Document 1. (a) is one longitudinal sectional view passing through the axis of the vibration damping device, and (b) is a longitudinal sectional view in a direction rotated by 90 ° with respect to (a).

  The vibration damping device 1 includes a vertical hollow body 10 made of a circular steel pipe and a suspension member of a steel chain 11 suspended therein. The upper end of the steel chain 11 is supported by a fixing hook 15 that is fixedly attached to a cover plate 12 installed on the upper part of the vertical hollow body 10. Therefore, the steel chain forms an unfixed free vibration part except for the upper end.

  Here, since the steel chain is suspended vertically at the center of the circular steel pipe, in the absence of vibration, the distance d between the outer surface of the steel chain 11 and the inner surface of the vertical hollow body 10 is the same as that of the circular steel pipe. It is kept equivalent internally.

  This vibration damping device 1 is subjected to vibrations caused by a resonance phenomenon caused by wind, earthquake, road surface vibration caused by traveling of the vehicle, etc., and excitation occurs. At that time, both the vertical hollow body 10 and the steel chain 11 vibrate, but the free vibration part of the steel chain 11 vibrates in a different manner from the vertical hollow body 10, so the free vibration part of the steel chain 11 is It collides with the inner wall surface of the vertical hollow body 10. As a result, since the vibration energy of the vertical hollow body 10 is dissipated, the vibration of the vertical hollow body 10 is rapidly damped and the vibration is stopped.

  Thus, by suspending the steel chain 11 inside the vertical hollow body 10, it is possible to form a vibration damping device that can attenuate and stop vibration applied to the vertical hollow body.

  When the standing member is a hollow vertical member, the vibration damping device 1 is attached to the outside or the inside of the vertical standing member to suppress vibration caused by the vibration applied to the vertical standing member. The vibration can be propagated to the vertical hollow body constituting the vibration device, and the vibration can be attenuated in the vertical hollow body to be stopped.

  On the other hand, when the standing member is not a hollow body or is inclined even if it is a hollow body, the above-mentioned vibration damping device is attached to the outside of the standing member, thereby damping the standing member. Can be granted.

  When the standing member itself is a vertical hollow body, that is, when the vertical hollow body 10 shown in FIG. 3 constitutes the standing member itself, the standing member is directly placed inside the vertical hollow body that becomes the standing member. By suspending the steel chain, it is possible to impart vibration damping to the standing member itself.

Japanese Patent Publication No. 04-26004

  Even if the vibration control device described in Patent Document 1 is incorporated in a standing member such as an illumination column, a sign column, or a signal column, the standing member is caused by a resonance phenomenon caused by wind, earthquake, road vibration caused by vehicle traveling, or the like. There was a case of shaking. And if these standing members are shaken, the generated vibration shortens the life of the equipment attached to the standing members.Furthermore, in the case of an illumination column, the illumination light is shaken and the person feels uncomfortable. give.

  In the case of vibrations caused by wind, earthquake or road surface vibrations due to vehicle running, etc., the vibration range is wide, so the vibration control device that simply suspends the steel chain inside the vertical hollow body It was found that this was because it could not handle vibrations in the entire frequency range. In particular, it has been found that the damping effect for low frequency vibrations of 1 to 2 Hz is insufficient.

  An object of the present invention is to provide a vibration damping device that has high damping performance against vibration whose frequency fluctuates in a wide range from high frequency to low frequency, and is independent of the direction of vibration, and a standing member excellent in vibration damping. There is to do.

  As a result of various studies, the present inventors have been able to attenuate vibration energy because the suspension member frequently collides with the vertical hollow body in high-frequency vibration. However, in low-frequency vibration, the suspension member has a vertical hollow body. After the collision, the suspension member does not have a restoring force to return to the original position, so that the vibration energy of the suspension member becomes insufficient. This is considered to be because the vibration energy is not easily attenuated due to the fact that the suspension member collides with the inner wall of the vertical hollow member.

  And in order to improve the damping property of the low frequency vibration, if the restoring force is given to the suspension member even if the collision frequency of the suspension member and the vertical hollow body is the same, the suspension member is sufficient by the principle of the pendulum. Under the idea that vibration energy can be applied and collision energy can be increased, the suspension member is composed of a linear upper suspension member and a lower suspension member formed by joining together multiple metal bodies. I found something to do.

  As the upper suspension member, for example, a linear member such as a metal wire can be used. As the lower suspension member, for example, a metal chain or a member in which a plurality of metal bodies are connected by a metal wire can be used.

  As a result, in high-frequency vibration, the lower suspension member formed by joining a plurality of metal bodies frequently collides with the vertical hollow body, so that vibration energy can be attenuated. Because the collision energy of the lower suspension member, which consists of a plurality of metal bodies joined together by the vertical collision with the vertical hollow body, is sufficiently large, the vibration energy can be attenuated. It is possible to provide a vibration damping device that has high damping performance even with respect to vibration whose frequency varies.

It should be noted that a specific low frequency vibration can be controlled by adjusting the length of the linear upper suspension member. That is, when the length of the linear upper suspension member is L, the natural frequency f _n of the lower suspension member formed by joining a plurality of metal bodies according to the principle of the pendulum is _expressed by the following equation (1). Therefore, the length L of the linear upper suspension member may be set according to the low frequency frequency for which vibration suppression is particularly desired.

f _n = (g / L) ^1/2 / 2π (1)
Here, f _n : natural frequency (Hz) of the lower suspension member
g: Gravitational acceleration (m / sec ² )
L: Length of upper suspension member (m)
In addition, by making the axis of the suspension member suspended inside and the axis of the vertical hollow body coincide with each other, it is possible to provide a vibration damping device that is not affected by the direction of vibration.

  The vibration damping device and the standing member excellent in vibration damping performance according to the present invention have been completed based on these findings and ideas. In addition, for the standing member having excellent vibration damping performance, the vibration damping device is attached to the outside or inside of the standing member, and the standing member itself is part of the vibration damping device. There are both cases to use for.

  The gist of the present invention is the following (1) to (5) vibration damping devices and (6) to (12) standing members having excellent vibration damping properties. Hereinafter, these may be collectively referred to as the present invention.

  (1) A vibration damping device comprising a vertical hollow body in which a suspension member is suspended, wherein the axis of the suspension member coincides with the axis of the vertical hollow body, and the suspension member is linear A vibration damping device comprising: an upper suspension member of the above and a lower suspension member formed by connecting a plurality of metal bodies.

  (2) The vibration damping device according to (1) above, wherein the upper suspension member is a metal wire.

  (3) The vibration damping device according to (1) or (2) above, wherein the lower suspension member is a metal chain.

  (4) The vibration damping device according to any one of the above (1) to (3), wherein the lower suspension member is formed by joining a plurality of metal bodies with metal wires.

  (5) The vibration damping device according to any one of (1) to (4) above, wherein the vertical hollow body is a metal tube.

  (6) A vertically erected member having excellent vibration damping characteristics, wherein the vibration damping device according to any one of (1) to (5) is attached to the outside or the inside.

  (7) An inclined standing member excellent in vibration damping, wherein the vibration damping device according to any one of (1) to (5) is attached to the outside.

  (8) A vertically extending tubular vertical erection member, in which a suspending member having an axis that coincides with the axis of the vertical erection member is suspended, and is suspended A vertical standing member excellent in vibration damping, characterized in that the member is composed of a linear upper suspension member and a lower suspension member formed by connecting a plurality of metal bodies.

  (9) The vertically erected member according to (8) above, wherein the upper suspension member is a metal wire.

  (10) The vertically erected member according to (8) or (9) above, wherein the lower suspension member is a metal chain.

  (11) The vertically erected member according to any one of (8) to (10) above, wherein the lower suspension member is formed by joining a plurality of metal bodies with metal wires.

  (12) The vertical standing member according to any one of the above (8) to (11), wherein the vertical standing member is a metal pipe.

  According to the present invention, it is possible to obtain a vibration damping device that can effectively cope with vibration whose frequency fluctuates in a wide range from a high frequency to a low frequency and a standing member excellent in vibration damping. Further, since the vibration damping device is a vertical hollow body having a suspension member suspended therein, a device that is not influenced by the direction of vibration can be obtained.

  Hereinafter, the present invention will be described with reference to the drawings. The present invention is not limited to the following examples.

  FIG. 1 shows an example of a vibration damping device according to the present invention. (a) is one longitudinal sectional view passing through the axis of the vibration damping device, and (b) is a longitudinal sectional view in a direction rotated by 90 ° with respect to (a).

  The vibration damping device 1 includes a vertical hollow body 10 made of a circular steel pipe, and an upper suspension member and a lower suspension member suspended therein. The upper suspension member is a steel wire 9, and the lower suspension member is a steel chain 11. The upper end of the steel wire 9 is supported by a fixing hook 15 attached to a cover plate 12 installed on the upper part of the vertical hollow body 10.

  The vertical hollow body constituting the vibration damping device of Example 1 is a steel tube having a circular cross section having an outer diameter of 76.3 mm, a wall thickness of 4.2 mm, an inner diameter of 67.9 mm, a length of 2.4 m, and a weight of 11.95 kg. . The upper suspension member uses a steel wire having a length of 1600 mm and an outer diameter of 1 mm, and the lower suspension member is made of steel having a chain diameter of 16 mm and a link having a length of 80 mm × width of 56 mm. A steel chain consisting of 14 links and having a total length of 70.4 cm and a total weight of 3879 g was used.

  Furthermore, the distance d between the outer surface of the suspension member and the inner surface of the vertical hollow body was 5.95 mm in the lower suspension member.

  Thus, when the suspension member suspended in the vertical hollow body is composed of a linear upper suspension member and a lower suspension member formed by joining a plurality of metal bodies, the vibration direction Regardless of this, it is possible to provide a vibration damping device having a high damping performance even for vibrations whose frequency fluctuates over a wide range from high frequencies to low frequencies, and a standing member excellent in vibration damping properties.

  In addition, the shape of the vertical hollow body is not limited to the above shape, and for example, the outer diameter is 34.0 to 114.3 mm, the inner diameter is 27.6 to 107.3 mm, the wall thickness is 2.3 to 4.5 mm, Those having a length of 1.0 to 2.4 m and a weight of 1.8 to 29 kg can be used.

  And as a material of a vertical hollow body, you may use metal pipes, such as a stainless steel pipe and an aluminum pipe other than a steel pipe. A steel pipe is preferable from the viewpoint of strength and durability. From the viewpoint of rust prevention, it is preferable to use a stainless steel pipe or to use the steel pipe after subjecting the steel pipe to a rust prevention treatment such as hot dip galvanization or painting.

  In addition, the cross-sectional shape of the vertical hollow body is not particularly limited, and may be a circle or a polygon such as an octagon or a hexagon. When a vibration control effect is required even for shaking in all directions, it is preferable to adopt a circular cross section.

  The upper suspension member is not limited to the above-described steel wire, and a metal wire such as stainless steel or aluminum may be used in addition to the steel wire. Moreover, you may use the thing of various length and an outer diameter in the range of length 500-3000mm and outer diameter 0.5-3mm. However, as described above, the length of the upper suspension member is preferably set according to the low frequency frequency for which vibration suppression is desired.

  The lower suspension member is not limited to the shape of the steel chain described above. The chain diameter is 6 to 25 mm, the length of one link is 30 to 125 mm, the width is 21 to 88 mm, the total length is 40 to 110 cm, and the total weight is 300. A steel chain of ˜15000 g can be used. In addition to the steel chain, a stainless steel chain may be used. From the viewpoint of strength and durability, a steel chain is preferable. From the viewpoint of rust prevention, it is preferable to use a stainless steel chain or to use a steel chain after subjecting it to a rust prevention treatment such as hot dip galvanization.

  When a metal vertical hollow body and a metal suspension member are used, the impact noise increases. To suppress this impact noise, the surface of the vertical hollow body and / or suspension member is made of elastic material such as rubber. The body is preferably lined or covered.

  The distance d between the outer surface of the suspension member and the inner surface of the vertical hollow body is not limited to the above numerical value, and may be about 3 to 15 mm.

  FIG. 2 shows an example of a vibration damping device according to the present invention. (a) is one longitudinal sectional view passing through the axis of the vibration damping device, and (b) is a longitudinal sectional view in a direction rotated by 90 ° with respect to (a).

  The vibration damping device 1 includes a vertical hollow body 10 made of a circular steel pipe, and an upper suspension member and a lower suspension member suspended therein. The upper suspension member is a steel wire 9, and the lower suspension member is a combination of a plurality of metal balls 8. The upper end of the steel wire 9 is supported by a fixing hook 15 attached to a cover plate 12 installed on the upper part of the vertical hollow body 10.

  The vertical hollow body constituting the vibration damping device of Example 2 is a steel pipe having a circular cross section having an outer diameter of 76.3 mm, a wall thickness of 4.2 mm, an inner diameter of 67.9 mm, a length of 2.4 m, and a weight of 11.95 kg. . The upper suspension member uses a steel wire having a length of 1600 mm and an outer diameter of 1 mm, and the lower suspension member is composed of eight steel balls made of 721 g having a diameter of 56 mm, a length of 42 mm, an outer diameter. It was used by connecting with a steel wire having a diameter of 4 mm.

  Furthermore, the distance d between the outer surface of the suspension member and the inner surface of the vertical hollow body was 5.95 mm in the lower suspension member.

  Thus, when the suspension member suspended in the vertical hollow body is composed of a linear upper suspension member and a lower suspension member formed by joining a plurality of metal bodies, the vibration direction Regardless of this, it is possible to provide a vibration damping device having a high damping performance even for vibrations whose frequency fluctuates over a wide range from high frequencies to low frequencies, and a standing member excellent in vibration damping properties.

  In addition, the shape of the vertical hollow body is not limited to the above shape, and for example, the outer diameter is 34.0 to 114.3 mm, the inner diameter is 27.6 to 107.3 mm, the wall thickness is 2.3 to 4.5 mm, Those having a length of 1.0 to 2.4 m and a weight of 1.8 to 29 kg can be used.

  And as a material of a vertical hollow body, you may use metal pipes, such as a stainless steel pipe and an aluminum pipe other than a steel pipe. A steel pipe is preferable from the viewpoint of strength and durability. From the viewpoint of rust prevention, it is preferable to use a stainless steel pipe or to use the steel pipe after subjecting the steel pipe to a rust prevention treatment such as hot dip galvanization or painting.

  In addition, the cross-sectional shape of the vertical hollow body is not particularly limited, and may be a circle or a polygon such as an octagon or a hexagon. When a vibration control effect is required even for shaking in all directions, it is preferable to adopt a circular cross section.

  The upper suspension member is not limited to the above-described steel wire, and a metal wire such as stainless steel or aluminum may be used in addition to the steel wire. Moreover, you may use the thing of various length and an outer diameter in the range of length 500-3000mm and outer diameter 0.5-3mm. However, as described above, the length of the upper suspension member is preferably set according to the low frequency frequency for which vibration suppression is desired.

  The lower suspension member can be formed by joining 2 to 30 metal balls having a diameter of 21 to 99 mm with steel wires having a length of 15 to 74 mm and an outer diameter of 2.6 to 9 mm. In addition, the shape of the metal body is not limited, and a plurality of metal bodies having shapes other than a sphere, such as a cube and a rectangular parallelepiped, can be used. As a material of the metal body, stainless steel or aluminum can be used in addition to steel.

  When a metal vertical hollow body and a metal suspension member are used, the impact noise increases. To suppress this impact noise, the surface of the vertical hollow body and / or suspension member is made of elastic material such as rubber. The body is preferably lined or covered.

  The distance d between the outer surface of the suspension member and the inner surface of the vertical hollow body is not limited to the above numerical value, and may be about 3 to 15 mm.

  Although the vibration damping device itself has been described above, when the standing member is a vertical hollow body, that is, when the vertical hollow body 10 shown in FIG. 1 itself constitutes a part of the standing member. By suspending the suspension member directly inside the vertical hollow body as the standing member, it is possible to impart damping properties to the standing member itself.

  On the other hand, when the standing member is not a hollow body or is inclined even if it is a hollow body, the above-described vibration damping device is attached to the outside or the inside of the standing member to stand upright. Damping property can be imparted to the member. Of course, even if the standing member is a vertical hollow body, it is needless to say that the standing member can be provided with damping properties by separately attaching a damping device to the outside or inside of the standing member.

  In order to give the standing member a great vibration damping property, a damping device is attached to a portion where the standing member shows the maximum displacement amplitude, or when the standing member is a vertical hollow body, the standing member itself Is preferably provided as a part of the vibration damping device. Moreover, in order to cope with each next vibration mode, it is preferable to attach the vibration damping device to a plurality of positions of the standing member.

  The application object to which the vibration damping device according to the present invention is attached is a standing member that generates vibration due to vibration, and can be applied to a suspension tower member in a suspension bridge in addition to an illumination column, a sign column, and a signal column.

  FIG. 3 shows an example when the vibration damping device 1 according to the present invention is attached to two locations outside the standing member.

  This standing member is an illumination column 2 in which an illuminating lamp 7 is attached to the tip of a projecting member 5, and a steel pipe 4 having a circular cross section is erected on a foundation 3, and from the top of the steel pipe 4 having a circular cross section. A projecting member 5 projects substantially horizontally, and a reinforcing stay 6 that supports the projecting member is provided. And the said damping device 1 is attached with the volt | bolt (not shown) at two places of the outer periphery upper part and center part of the steel pipe 4 with a circular cross section.

  When a vibration occurs in a steel pipe having a circular cross section of the lighting column 2 due to a resonance phenomenon caused by wind, earthquake, road vibration caused by traveling of a vehicle, etc., the vibration is transmitted to the vibration damping device 1 attached to the lighting column, and excitation is generated. Occur. At that time, the vibration control device 1 composed of a vertical hollow body and a suspension member is activated, and the suspension member is composed of a linear upper suspension member and a lower suspension member formed by connecting a plurality of metal bodies. In this case, the vibration energy can be sufficiently attenuated even in the vibration whose frequency fluctuates in a wide range from a high frequency to a low frequency regardless of the vibration direction. Therefore, the vibration energy of the vertical hollow body is dissipated, and the vibration of the illumination column 2 which is a standing member is restrained.

  According to the present invention, it is possible to obtain a vibration damping device that can effectively cope with vibration whose frequency fluctuates in a wide range from a high frequency to a low frequency and a standing member excellent in vibration damping. Further, since the vibration damping device is a vertical hollow body having a suspension member suspended therein, a device that is not influenced by the direction of vibration can be obtained.

It is a longitudinal section showing an example of a vibration damping device concerning the present invention. It is a longitudinal cross-sectional view which shows the other example of the damping device concerning this invention. It is a figure which shows an example when the damping device 1 which concerns on this invention is attached to two places outside the standing member. It is a longitudinal cross-sectional view which shows an example of the conventional damping device described in patent document 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Damping device 2 Illumination pillar 3 Base 4 Steel pipe of circular cross section 5 Overhang member 6 Reinforcement stay 7 Illumination lamp 8 Metal ball 9 Wire 10 Vertical hollow body 11 Steel chain 12 Cover plate 15 Fixed hook d The outer surface of the suspension member Distance from the inner surface of the vertical hollow body

Claims (12)

  A vibration damping device comprising a vertical hollow body in which a suspension member is suspended, wherein the axis of the suspension member coincides with the axis of the vertical hollow body, and the suspension member is a linear upper suspension. A vibration damping device comprising a lowering member and a lower suspension member formed by connecting a plurality of metal bodies.   The vibration control device according to claim 1, wherein the upper suspension member is a metal wire.   The vibration damping device according to claim 1 or 2, wherein the lower suspension member is a metal chain.   The vibration control device according to any one of claims 1 to 3, wherein the lower suspension member is formed by connecting a plurality of metal bodies with metal wires.   The vibration damping device according to claim 1, wherein the vertical hollow body is a metal tube.   A vertically erected member having excellent vibration damping properties, wherein the vibration damping device according to any one of claims 1 to 5 is attached to the outside or the inside.   An inclined standing member excellent in vibration damping, wherein the vibration damping device according to any one of claims 1 to 5 is attached to the outside.   A vertically extending tubular vertical erection member, a suspension member having an axis that coincides with the axis of the vertical erection member is suspended therein, and the suspension member is a wire A vertically erected member having excellent vibration damping characteristics, comprising a plurality of upper suspended members and a lower suspended member formed by connecting a plurality of metal bodies together.   The vertical erection member according to claim 8, wherein the upper suspension member is a metal wire.   The vertically erected member according to claim 8 or 9, wherein the lower suspension member is a metal chain.   The vertical erection member according to any one of claims 8 to 10, wherein the lower suspending member is formed by joining a plurality of metal bodies with a metal wire. The vertical standing member according to any one of claims 8 to 11, wherein the vertical standing member is a metal pipe.

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