JP2002021916A - Vibration damping device and pedestrian overpass having this device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration damping device easily installable even in a small-scale pedestrian overpass, simply installable even in an existing pedestrian overpass and having no influence on walking of a pedestrian. SOLUTION: A weight 8 arranged so as to be vertically freely movable along a guide, springs 13 for braking a vertical movement of the weight 8 and a damper for damping vibration of the vertical movement of the weight 8, are housed in a longitudinally flat rectangular solid-shaped box body 1 having the small depth to a width and the height.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device (tuning mass damper) which can be easily applied to a structure which easily swings in a vertical direction such as a pedestrian bridge, and a pedestrian bridge to which the vibration damping device is attached.

[0002]

2. Description of the Related Art Generally, in a relatively long pedestrian bridge, the natural frequency of the bridge girder approaches the pedestrian's pace, and the vibration caused by walking increases.

By the way, in the case of a large-sized pedestrian bridge, since the cross section is constituted by a box girder, the space of the box girder is large.
A vibration damping device is installed in the space.

[0004]

In a small-sized pedestrian bridge, the girder structure is an I-girder having an open section and the girder height is low.
There is a problem that the vibration damping device cannot be incorporated in the underfloor space composed of the floor plate and the I-girder of the pedestrian bridge.

[0005] On the other hand, in a large-sized pedestrian bridge, a damping device may be installed from the beginning. However, if the damping result is inconvenient due to design or other reasons, the cross section of the girder is changed to increase the bending rigidity. It is very difficult to do so, and there is a problem that the cost is greatly increased.

In consideration of the above points, the present invention can be easily installed on a small pedestrian bridge and can be easily attached to an existing pedestrian bridge without affecting pedestrian walking. An object of the present invention is to provide a vibration damping device that can be easily installed on a structure that easily swings in the vertical direction, and to provide a pedestrian bridge to which the vibration damping device is attached.

[0007]

In order to achieve the above object, a vibration damping device according to the present invention is provided in a box having a rectangular parallelepiped shape having a small depth with respect to width and height and having a flat front-rear direction along a guide. The weight includes a movable weight, a spring for braking the vertical movement of the weight, and an attenuator for attenuating the vertical vibration of the weight.

[0008] In the vibration damping device of the present invention configured as described above, the box housing the weight, the spring, and the attenuator is formed in a rectangular parallelepiped shape having a small depth with respect to the width and the height and a flat front and rear direction. It can be easily mounted in the form of a pedestrian bridge in parallel with the railing, that is, in the space constituting the railing, in a buried form, without affecting the walking of pedestrians and having a good appearance. It can be easily installed on existing pedestrian bridges as well as new ones.

Further, by opening or removing the front cover plate of the box, maintenance, adjustment and repair are extremely easy.

Further, the weight is made into a block shape, and vertically fixed supports on both sides are inserted into vertical through holes on both sides of the weight, and the weight and the lower surface or the upper surface or the lower surface and the upper surface of the box body are inserted. It is desirable to provide a spring between them, and they can be stored compactly in a box.

[0011] Further, the attenuator includes a fixed copper plate fixed on both sides in the box body, iron plates protruding on both sides of the weight and located in front of and behind the fixed copper plate, and an iron plate on the fixed copper plate side of each iron plate. It is preferable to use a permanent magnet fixed to the surface, and the attenuator can be made simple and inexpensive.

[0012] In addition, by mounting the vibration damping device on the railing on both sides of the footbridge of the pedestrian bridge in parallel with the railing, the mounting work is almost on the floorboard, and the work is easy and safe. Can be easily attached to the pedestrian and without affecting the walking of pedestrians,
The appearance is also good.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a vibration damping device according to the present invention will be described with reference to FIGS. Reference numeral 1 denotes a box, which has a rectangular parallelepiped shape having a small depth with respect to width and height and a flat front-rear direction and a rectangular cross section joined to form a frame 3 to form a frame 3. Is slightly longer than the height,
A back plate 4 is fixed to the back surface of the frame 3, and a cover plate 5 is detachably attached to the front surface of the frame 3, and the frame 3, the back plate 4, and the cover plate 5
Constitutes the box 1.

Reference numeral 6 denotes a fixed support which constitutes a guide. The support 6 is vertically fixed to both sides in the box 1 and is supported by a support 7 whose upper and lower ends are fixed to the inner surfaces of the upper and lower pipes 2. ing.

Reference numeral 8 denotes a block-shaped weight, which has a height smaller than the width and has a smaller depth, and has a flat horizontally-long rectangular parallelepiped shape in the front-rear direction, and vertical holes 9 formed on both sides. . Reference numeral 10 denotes a linear bush attached to the upper end and the lower end of the through hole 9. The fixed support 6 is inserted into the through hole 9 via the linear bush 10, and the weight 8 is fixed to the fixed support 6.
It can be moved up and down as a guide.

Reference numeral 11 denotes a plurality of adjustment weights attached to the upper surface of the weight 8 by bolts 12, and the weight of the weight 8 is adjusted by appropriately increasing or decreasing. Reference numeral 13 denotes a lower member 2 provided between the lower surface of the weight 8 and the lower surface of the frame 3, that is, the upper surface of the lower pipe 2.
Each of the compression springs is located inside the fixed columns 6, and the upper and lower ends of the spring 13 are supported by a spring support 14 fixed to the weight 8 and the lower pipe 2.

Reference numeral 15 denotes a fixing plate fixed to the upper and lower portions of the inner surface of the pipes 2 on both sides, and 16 denotes a support plate, and the L-shaped mounting plate 1
7 are integrally fixed. Reference numeral 18 denotes a vertically fixed copper plate parallel to the frame 3, and upper and lower end plates of the copper plate 18 are attached to upper and lower mounting plates 17 so as to be adjustable in the left-right direction. It is attached to the fixing plate 15 so as to be adjustable in the front-rear direction.

Reference numeral 19 denotes two substantially square iron plates projecting from both sides of the weight 8, parallel to the frame 3, and fixed to a vertically long substrate 20 at right angles. 1
9, a horizontal reinforcing plate 21 is fixed substantially at the center, and 2
The iron plates 19 are located in front of and behind the fixed copper plate 18. Reference numeral 22 denotes a plurality of permanent magnets, which are fixed to the surface of the iron plate 19 on the fixed copper plate 18 side, and each permanent magnet 22 is positioned so as to sandwich the fixed copper plate 18 in front of and behind the fixed copper plate 18 with a gap, The fixed copper plate 18 and each permanent magnet 22 constitute an attenuator.

Reference numeral 23 denotes a support fitting fixed to the center of the lower surface of the upper pipe 2 and has a U-shaped cross section. Reference numeral 24 denotes a stopper fixed to the lower face of the support fitting 23. The upper movement position is regulated. Reference numeral 25 denotes a mounting angle, which is fixed to the upper and lower ends of the outer surface of the pipes 2 on both sides.

Next, a case where the above-described vibration damping device is mounted on a pedestrian bridge will be described with reference to FIGS. 5 and 6. FIG. 2
6 is a pedestrian bridge, 27 is a girder of a pedestrian bridge 26, 28 is a floor board, 29
Is a balustrade on both sides of the floorboard 28, 30 is a bamboo (handrail) of the bamboo 29, 31 is a column of the bamboo grass 30, 32 is a midway, 33 is a vertical bar, and the vibration damping device 34 is attached to the upper mounting angle 25 at both sides. Mounting angles 2 on the lower side of both sides on the lower surface of Kasagi 30
5 is attached to the upper surface of the floor plate 28 with bolts or the like, and the lid plate 5 is located on the side of the sidewalk, and the depth of the railing 29 and the depth of the vibration damping device 34 are the same or the vibration damping device 34 is smaller. The front surface of the vibration device 34 does not protrude toward the sidewalk from the inner surface of the railing 29, and does not hinder walking.

FIG. 7 shows the railing 29 of the existing pedestrian bridge 26. In this case, the vibration damping device 34 can be easily attached by removing the hatched portions shown.

In the vibration damping device 34, each permanent magnet 22 vibrates up and down together with the weight 8, and a damping force proportional to the relative speed between each permanent magnet 22 and the fixed copper plate 18 is obtained.

Next, the heavier the weight 8, the greater the vibration damping effect. However, the weight is about 1% of the vibration weight of the pedestrian bridge 26, and the vibration without the vibration damping device is suppressed to about 1/10. it can.

The strength of the spring 13 is designed so that the vibration of the weight 8 substantially coincides with the vibration of the girder. In addition to the compression spring 13 below the weight 8, the spring 13 May be installed. Alternatively, the weight 8 may be suspended only by the spring above the weight 8.

Further, as for the attenuator, the magnetic damper composed of the fixed copper plate 18 and each permanent magnet 22 has been described, but this magnetic damper requires no maintenance. Instead of the magnetic damper, an air damper and an oil damper can be applied.

[0026]

Since the present invention is configured as described above, it has the following effects. Since the box body 1 housing the weight 8, the spring 13, and the attenuator is formed in a rectangular parallelepiped shape in which the depth is small with respect to the width and the height, the front-rear direction is flat. That is, it can be easily mounted in the space that composes the railing in an embedded form, does not affect the walking of pedestrians, has a good appearance, and can be easily mounted on existing pedestrian bridges as well as new ones. it can.

Further, by opening or removing the front cover plate 5 of the box 1, maintenance, adjustment and repair are extremely easy.

The weight 8 is made into a block shape, and the vertical fixing holes 6 on both sides are inserted into the vertical through holes 9 on both sides of the weight 8.
, And a spring 13 is desirably provided between the weight 8 and the lower surface or the upper surface in the box 1, and can be compactly stored in the box 1.

The attenuator is further provided with fixed copper plates 18 fixed to both sides in the box 1, iron plates 19 projecting from both sides of the weight 8 and positioned in front of and behind the fixed copper plates 18, and each iron plate. It is preferable that the attenuator is constituted by a simple structure and inexpensive with a permanent magnet 22 fixed to the surface of the fixed copper plate 18 on the fixed copper plate 18 side.

In addition, by mounting the vibration damping device parallel to the railing on both sides of the floorboard of the pedestrian bridge, the mounting work is almost on the floorboard, and the work is easy and safe. Can be easily attached to the pedestrian and without affecting the walking of pedestrians,
The appearance is also good.

[Brief description of the drawings]

FIG. 1 is a partially cut front view of a vibration damping device according to an embodiment of the present invention, from which a cover plate is removed.

FIGS. 2A and 2B are a plan view and a cross-sectional view taken along line IIB-IIB of FIG.

FIGS. 3A, 3B, and 3C are a right side view, a sectional view taken along line IIIB-IIIB, and a sectional view taken along line IIIC-IIIC of FIG.

FIG. 4 is an enlarged view of a part of FIG. 2B.

FIG. 5 is a front view of an example of the footbridge according to the present invention.

6A and 6B are an enlarged view of a part of FIG. 5 and a cut side view thereof.

FIG. 7 is a front view of a part of a footbridge.

[Description of Signs] 1 Box 6 Fixed Post 8 Weight Pyramid 9 Through Hole 13 Spring 18 Fixed Copper Plate 19 Iron Plate 22 Permanent Magnet

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Akihide Hatanaka 2-15-2, Tsurumachi, Taisho-ku, Osaka-shi, Osaka F-term in Nichizo Tech Co., Ltd. (Reference) 2D059 BB03 GG05 GG13 3J048 AA02 AC08 AD07 BC01 BE08 BF03 EA39

Claims (4)

[Claims] 1. A weight that is vertically movable along a guide in a rectangular parallelepiped box whose depth is small relative to the width and height, and a spring that brakes the vertical movement of the weight. And a damper for damping vertical vibration of the weight. 2. The weight has a block shape, and vertically fixed supports on both sides are inserted into vertical through holes on both sides of the weight,
The vibration damping device according to claim 1, wherein a spring is provided between the weight and the lower surface or the upper surface or both the lower surface and the upper surface in the box. 3. A fixed copper plate fixed to both sides of the box body, an iron plate protruding from both sides of a weight, and iron plates located in front of and behind the fixed copper plate, and the fixed copper plate of each of the iron plates. 3. The vibration damping device according to claim 1, comprising a permanent magnet fixed to the side surface. 4. A pedestrian bridge, wherein the vibration damping device according to claim 1, 2 or 3 is attached to a railing on both sides of a floor plate in parallel with the railing.