JP6007153B2 - Vibration control device - Google Patents

Description

  The present invention relates to a vibration damping device that is attached to absorb an impact between a lower structure such as a bridge pier and a heavy object such as a bridge girder when a vehicle passes or an earthquake occurs, or to prevent displacement. It is about.

In order to absorb vibrations and displacement due to vehicle traffic or earthquakes between the lower building 11 such as a bridge pier and the building 10 such as a bridge girder placed on the lower building 11 in FIG. A damper 12 as shown in FIG.
According to Patent Document 1, as shown in FIG. 6 (a) or (b), when the building 10 is mounted on the lower structure 11 with a support shoe (not shown) interposed, Between the building 11 and the building 10, the bracket 51 on the lower building 11 side and the building are constructed in order to absorb impacts such as vibrations caused by vehicles and earthquakes and thereby reduce accidents and destruction as much as possible. The damper 12 is connected to the bracket 51 on the object 10 side.

In particular, earthquake vibrations occur in all directions, including the vertical direction, horizontal direction, diagonal direction, and a combination of these directions. Also, the displacement is large. Therefore, a vibration damping device that can quickly respond in all these directions is desired.
In the case shown in FIG. 6A, when the damper 12 is attached between the lower building body 11 side and the building 10 with the lower bracket 50 and the upper bracket 51, the upper bracket 51 is the base plate 13a on the building 10 side. Two rib plates 14a are integrally attached at predetermined intervals, a support shaft 15a is vertically attached between the rib plates 14a, and a spherical bearing is mounted on a gusset plate 16a fixedly provided at one end of the damper 12. 17a is attached, and the first support shaft 15a is fitted to the spherical bearing 17a. Similarly, the lower bracket 50 on the lower building body 11 side has two rib plates 14b integrally attached to the base plate 13b at a predetermined interval, a support shaft 15b is vertically attached between the rib plates 14b, and the damper 12 A spherical bearing 17b is attached to a gusset plate 16b fixedly provided at one end of the first support shaft 15b, and the first support shaft 15b is fitted to the spherical bearing 17b.
With such a configuration, not only in the plane orthogonal to the upper and lower support shafts 15a and 15b but also in all directions within the range of the allowable alignment angle by the spherical surfaces of the upper and lower spherical bearings 17a and 17b.

In FIG. 6B, instead of the upper and lower spherical bearings 17a and 17b shown in FIG. 6A, second support shafts 18a and 18b orthogonal to each other at positions separated from the upper and lower support shafts 15a and 15b are provided. An example is shown. More specifically, the first support shaft 15a is vertically mounted between the rib plates 14a, the gusset plate 20a is suspended from the bearing 19a fitted to the first support shaft 15a, and the gusset plate 20a and one end of the damper 12 are suspended. The gusset plate 16a is connected by a second support shaft 18a orthogonal to the first support shaft 15a. The lower structure 11 side has the same configuration.
With such a configuration, the in-plane orthogonal to the first support shaft 15a and the first support shaft 15b and the in-plane orthogonal to the second support shaft 18a and the second support shaft 18b can be combined to cope with all directions.

Japanese Patent Laying-Open No. 2005-299078.

6 (a) uses the support shaft 15 and the spherical bearing 17, in particular, since the spherical bearing 17 has a precise structure, there is a risk of destruction when subjected to a huge impact. Since the allowable alignment angle is set to about 5 to 6 degrees, it cannot cope with a large displacement. When the pin diameter is increased, there are some which are about 10 degrees. However, when the pin diameter is increased and the rotation angle is increased, the spherical bearing 17 is also increased accordingly, and the brackets and the like receiving it are increased. It cannot be used when there is a limited installation space, such as between.
In addition, since the allowable alignment angle is small and it is not possible to cope with a large misalignment, simply installing the damper 12 does not provide an effect of preventing a fallen bridge. As shown in FIG. By attaching a fall prevention device connected to the lower bracket 50 and the upper bracket 51 with a cable 52 having a slack between the body 11 and the body 11, the amount of displacement is as much as the slack of the cable 52 becomes a straight line. They stopped and prevented the fall of building 10.

  In the example where the first support shaft 15 and the second support shaft 18 are attached with a distance as shown in FIG. 6B, the length from the bracket at one end of the damper 12 to the bracket at the other end of the damper 12 is long. Therefore, since it becomes structurally large, it can be used only for a thing with a large gap between the lower structure 11 and the structure 10. Furthermore, since the load having the first support shaft 15 as a fulcrum and the load having the second support shaft 18 as a fulcrum are placed at a distance, there is a problem that the smooth damping effect of the damper 12 is not exhibited.

  An object of the present invention is to provide a vibration damping device that can follow a large change in angle in all directions and that can withstand a large load with a compact structure.

  The present invention relates to a vibration damping device that suppresses mutual vibration between the lower building 11 and the building 10 by connecting both ends of the damper 21 with the rotating bracket 22. The rotating bracket 22 includes the damper 21. The thickness direction of the bracket main body 23 is fitted in the space 36 of the two rib plates 35 provided at one end, and the first shaft hole 27 formed by orthogonally drilling the rib plate 35 and the bracket main body 23 is first. The shaft body 24 is rotatably fitted, and the width direction of the bracket body 23 is fitted into the space 33 of the two rib plates 32 provided via the base plate 31 attached to the lower structure 11. A second shaft body 25 is rotatably fitted in a second shaft hole 28 formed in the bracket body 23 in a direction orthogonal to the first shaft body 24 on the same axis, and the other end of the damper 21 and the building Rotating bracket at 10 connecting parts 22 is also configured in the same manner.

  The bracket main body 23 has an octagonal prism shape, penetrates the upper and lower surfaces of the bracket main body 23, drills a first shaft hole 27, and reaches halfway between both sides of the bracket main body 23 orthogonal to the first shaft hole 27. Each of the second shaft holes 28 is formed, and one first shaft body 24 is fitted into the first shaft hole 27, and one second shaft is provided in each of the second shaft holes 28. The body 25 is fitted.

  The first shaft body 24 is fitted through the rib plate 35 and the bracket main body 23 on both sides, and the holding plate 29 is fixed to the outer side surface of each rib plate 35 with the bolts 30 to prevent the second shaft body 24 from coming off. The shaft body 25 is configured such that the second shaft body 25 is inserted and fitted from the second shaft hole 28 of the rib plate 32 to the second shaft hole 28 a of the bracket body 23, and the pressing plate 29 is applied to the outer surface of the rib plate 32. Fix with to prevent it from coming off.

  The first shaft body 24 and the second shaft body 25 are fitted into the inner periphery of the first shaft hole 27 and the second shaft hole 28 with the slide bearing 26 interposed therebetween.

  The second shaft body 25 includes a large-diameter portion 25 a that is fitted to the rib plate 32, a middle-diameter portion 25 b that is fitted to the bracket body 23, and a small-diameter screw portion 25 c that is screwed to the bracket 23.

The invention described in claim 1
In the vibration control device that suppresses mutual vibration by connecting both ends of the damper with rotating brackets between the substructure and the building,
The rotating bracket is fitted in the thickness direction in the space of the two ribs plate provided at an end portion of the damper, fitted in the width direction into two spaces in the rib plate provided on the lower construction body The bracket body,
A first shaft body rotatably fitted in a first shaft hole penetrating the thickness direction of the bracket body and two rib plates provided at the end of the damper;
Rotates from two rib plates provided in the lower structure to a second shaft hole formed in the width direction of the bracket main body and perpendicular to the first shaft hole and halfway on both sides of the bracket of the lower structure It consists of two second shaft bodies fitted freely,
The second shaft body has a step of a large diameter portion that fits into the second shaft hole of the rib plate provided in the lower building body and a medium diameter portion that fits into the second shaft hole of the bracket body. Consisting of axes,
Because the rotating bracket at the other end of the damper and the connecting part of the building is configured in the same way,
Compared with the prior art, it is possible to cope with displacement of a large rotation angle, and the structure is simple, and it is possible to cope with a large impact. Furthermore, since it is possible to cope with a large rotation angle, it is possible to prevent a falling bridge by combining the operation of a conventionally used falling bridge prevention device. Since the first shaft body and the second shaft body intersect on the same axis, the damper is smoothly damped in any direction, and a compact shape can be achieved.
In addition, the second shaft body is composed of a shaft having a step of a large diameter portion that fits into the rib plate and a medium diameter portion that fits into the bracket main body, so that the second shaft body fits into the bracket main body. Is the medium diameter portion, and the size of the bracket body can be reduced by making the bearing portion of the bracket body as small as possible. The part that receives the load can reduce the length from the bracket at one end of the damper to the bracket at the other end of the damper while receiving vibration and preventing damage at the large diameter part that fits into the rib plate. It can be used for a thing with a small interval between a building and a building.

The invention according to claim 2
The second shaft body has a three-stage structure including a large-diameter portion that is fitted to a rib plate provided in the lower structure, a medium-diameter portion that is fitted to the bracket body, and a small-diameter screw portion that is screwed to the bracket body. Because it consists of a shaft, the other end of the damper and the rotating bracket at the connecting part of the building are configured in the same way,
The portion where the second shaft body fits into the bracket body is a small-diameter threaded portion that is screwed into the medium-diameter portion and the rib plate, and the bearing portion of the bracket body is made as small as possible to reduce the size of the bracket body while reducing the size of the bracket body. The threaded part can be securely fixed to the bracket body.

The invention described in claim 3
Since the bracket body is a thick octagonal column,
A first shaft hole is drilled through the center of the upper and lower surfaces, and a first shaft hole coaxial with the first shaft hole is also drilled in the rib plate. The second shaft hole for mounting the second shaft body is drilled to the middle of the first shaft hole, and is orthogonal to the first shaft hole. The second shaft hole is coaxial with the second shaft hole. The second shaft hole is drilled.

The invention according to claim 4
Both end portions of the first shaft body, and fixedly retaining in Ategai bolts holding plate on the outer surface of the rib plates of their respective, one end of each of the second shaft, the outer surface of the Li blanking plate Since the presser plate is fixed with a bolt to prevent it from coming off,
The structure of the rotating part can be reduced in size.

The invention of claim 5
Since the first shaft body and the second shaft body are fitted to the inner periphery of each of the first shaft hole and the second shaft hole via a slip bearing,
Low friction and smooth response to displacement. Therefore, it is possible to reliably respond to a vibration such as an earthquake that cannot be predicted when it occurs.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a first embodiment of a vibration damping device according to the present invention and is a front view showing a state displaced from a point A to a point B. It is a top view which shows the state displaced from the A point to the C point in FIG. It is a plane sectional view of the rotation bracket used for the vibration damping device of the present invention. It is front sectional drawing seen from the front of the rotation bracket used for the damping device of this invention. It is side surface sectional drawing seen from the side surface of the rotation bracket used for the damping device of this invention. (A) And (b) is sectional drawing which showed the example from which the conventional damping device differs, respectively, (c) is explanatory drawing of the conventional fallen bridge prevention apparatus.

  The vibration damping device of the present invention is a vibration damping device in which both ends of a damper 21 are connected by a rotating bracket 22 between the lower building body 11 and the building 10 to suppress mutual vibration. A first axial hole in which the thickness direction of the bracket body 23 is fitted in a space 36 of two rib plates 35 provided at one end of the damper 21 and the rib plate 35 and the bracket body 23 are formed perpendicularly. 27, the first shaft body 24 is rotatably fitted, the width direction of the bracket body 23 is fitted into the space 33 of the two rib plates 32 provided in the lower structure 11, and the bracket body 23 A second shaft body 25 is rotatably fitted in a second shaft hole 28 drilled in a direction orthogonal to the first shaft body 24 on the same axis, and the other end portion of the damper 21 and the connecting portion of the building 10 are connected. The rotating bracket 22 is similarly configured.

  The bracket main body 23 has an octagonal prism shape, penetrates the upper and lower surfaces of the bracket main body 23, drills a first shaft hole 27, and reaches halfway between both sides of the bracket main body 23 orthogonal to the first shaft hole 27. Each of the second shaft holes 28 is formed, and one first shaft body 24 is fitted into the first shaft hole 27, and one second shaft is provided in each of the second shaft holes 28. The body 25 is fitted.

  The first shaft body 24 is fitted through the rib plate 35 and the bracket main body 23 on both sides, and the holding plate 29 is fixed to the outer side surface of each rib plate 35 with the bolts 30 to prevent the second shaft body 24 from coming off. The shaft body 25 is configured such that the second shaft body 25 is inserted and fitted from the second shaft hole 28 of the rib plate 32 to the second shaft hole 28 a of the bracket body 23, and the pressing plate 29 is applied to the outer surface of the rib plate 32. Secure with.

The first shaft body 24 and the second shaft body 25 are fitted to the inner periphery of the first shaft hole 27 and the second shaft hole 28 with the slide bearing 26 interposed therebetween. The sliding bearing 26 is a non-lubricated sliding bearing that can be used at a high load (for example, 137 MPa), can be used in a wide temperature range (-200 ° C. to + 260 ° C.), and has a thin plate pressure (1.0 to 2.5 mm). Therefore, it becomes compact, and the friction coefficient (μ = 0.04-0.20) is small, and the wear can be reduced for a long time.
By interposing this sliding bearing, the friction becomes low and the response to the displacement becomes smooth, and it is possible to surely respond to a vibration such as an earthquake that cannot be predicted when it occurs.

  The second shaft body 25 includes a large-diameter portion 25 a that fits into the rib plate 32, an intermediate-diameter portion 25 b that fits into the bracket body 23, and a small-diameter screw portion 25 c that engages with the rib plate 32. With this configuration, the portion where the second shaft body 25 is fitted to the bracket body 23 is the small-diameter screw portion 25c that is screwed into the medium diameter portion 25a and the rib plate 32, and the bearing portion in the bracket body 23 is The bracket main body 23 can be reliably fixed to the bracket main body 23 with the small diameter screw portion 25c while reducing the size of the bracket main body 23 as small as possible. Therefore, the portion that receives the load is from the bracket 22 at one end of the damper 21 to the bracket 22 at the other end of the damper 21 while receiving vibration or the like at the large-diameter portion 25a fitted to the rib plate 32 to prevent breakage. Can be shortened, and can be used for a small distance between the lower structure and the building.

  1 and 2, reference numeral 11 denotes a lower building such as a bridge pier, and a building 10 such as a bridge girder is placed on the lower building 11 with a support shoe (not shown) interposed therebetween. . A damper 21 is connected between the lower building 11 and the building 10 by rotating brackets 22 at both ends, and the vibration caused by the passage of the vehicle and the vibration at the time of the earthquake are absorbed to prevent the building 10 from dropping or breaking. doing. The damper 21 may be a hydraulic type or a friction type.

The rotating bracket 22 has a configuration unique to the present invention, is rotatable in the directions of the XY axes, and is configured to be compact and robust.
This will be described in detail with reference to FIGS. In addition, since this rotating bracket 22 has the same structure as that for connecting one end of the damper 21 to the lower building 11 side and that for connecting the other end of the damper 21 to the building 10, the lower building 11. The rotating bracket 22 used for the side connection will be described.
A base plate 34 is fixedly provided at one end of the damper 21, and two rib plates 35 are fixed to the base plate 34 in parallel with a space 36 corresponding to the thickness of the bracket body 23 described later. ing. In addition, a base plate 31 is fixedly provided on the lower structure 11 side with a plurality of bolts and the like, and a space 33 in which two rib plates 32 can be fitted in the vertical direction of the bracket body 23 is provided. It is fixed in parallel. The rib plate 32 is reinforced by a reinforcing plate 37.

The bracket body 23 is made of metal and has a thick octagonal column, and a first shaft hole 27 is formed through the center of the upper and lower surfaces. A first shaft hole 27 a that is coaxial with the first shaft hole 27 is also formed in the rib plate 35.
On the upper and lower end surfaces of the bracket body 23, a second shaft hole 28 a for mounting the second shaft body 25 is drilled up to a middle position orthogonal to the first shaft hole 27. A second shaft hole 28 is formed in the rib plate 32 coaxially with the second shaft hole 28a.

A first shaft body 24 is fitted into the first shaft hole 27 of the bracket body 23 via a sliding bearing 26 for smooth rotation, and the projecting portions on both ends of the first shaft body 24 are two sheets. The first shaft body 27 is fitted into the first shaft hole 27a of the rib plate 35, the both end surfaces of the first shaft body 24 are made to coincide with the outer surface of the rib plate 35, and the holding plate 29 is attached to the rib plate 35 with bolts 30 applied to the end surfaces. It shall be prevented from coming off.
The second shaft body 25 fitted into the second shaft hole 28 is composed of a three-stage shaft including a large diameter portion 25a, a medium diameter portion 25b, and a small diameter screw portion 25c. The large diameter portion 25a is formed of the rib plate. The intermediate shaft portion 25b is fitted into the second shaft hole 28a of the bracket body 23, and the small diameter screw portion 25c is fitted to the bracket body. 23 is fixed by screwing. The large-diameter portion 25a of the second shaft body 25 is fitted into the second shaft hole 28 of the two rib plates 32, and both end surfaces of the large-diameter portion 25a are aligned with the outer surfaces of the rib plates 32. A presser plate 29 is attached to the end surface by a bolt 30 to the rib plate 32 to prevent it from coming off.

The assembly order of the components configured as described above is such that the bracket body 23 is fitted in the thickness direction in the space 36 of the two rib plates 35 at the end of the damper 21. The first shaft hole 27 of the bracket body 23 and the first shaft holes 27a of the two rib plates 35 are aligned so as to be coaxial, and the first shaft body 24 covered with the slide bearing 26 is inserted. The holding plate 29 is fixed to the outer side surfaces of the two rib plates 35 with the bolts 30 respectively.
The bracket body 23 fixed to the damper 21 is vertically oriented and fitted between the two rib plates 32, and the second shaft body 25 is inserted into the second shaft hole 28 of the rib plate 32 from the outside. The small-diameter screw portion 25c of the second shaft body 25 is inserted first, the medium-diameter portion 25b is fitted into the second shaft hole 28a of the bracket body 23, and finally the large-diameter portion 25a covered with the slide bearing 26 is the rib plate. 32 of the second shaft holes 28 are fitted. Further, a small-diameter threaded portion 25c at the tip is screwed into the bracket body 23 and fixed. A presser plate 29 is fixed to the outer surface of the second shaft body 25 with an assigning bolt 30. Similarly, the second shaft body 25 is fitted into the opposite surface of the bracket body 23, and the holding plate 29 is fixed with the fitting bolt 30.
As described above, one end of the damper 21 is connected to the lower building 11 side with the rotating bracket 22 interposed.
Similarly, the other end of the damper 21 is connected to the building 10 side with a rotating bracket 22 interposed.

  As shown in FIG. 1, if the mutual positions of the lower building 11 and the building 10 are displaced in the vertical direction from the point A to the point B, the rotary bracket 22 according to the present invention is centered on the first shaft body 24. It follows within the range of the angle α by the rotated rotation. This angle α is determined at a position where the rib plate 35 and the rib plate 32 are in contact with each other, and is ± 15 degrees in this embodiment. This angle α can be further increased if the mechanical strength of the rotary bracket 22 is taken into consideration.

  As shown in FIG. 2, if the mutual position of the lower building 11 and the building 10 is moved horizontally from the point A to the point C, the rotating bracket 22 according to the present invention is centered on the second shaft body 25. It follows within the range of angle β by the rotation. This angle β is determined by the position at which the damper 21 comes into contact with the base plate 31 and the rib plate 32 of the lower structure 11, and is ± 90 degrees in this embodiment.

  The displacement of the lower building 11 and the building 10 is the vertical direction in FIG. 1 and the horizontal direction in FIG. 2, but in reality, the vertical direction and the horizontal direction are displaced at the same time, so it can follow a three-dimensional displacement. it can.

The bracket body is not limited to an octagonal prism shape, but may be a quadrangle, an ellipse, or a circle.

  DESCRIPTION OF SYMBOLS 10 ... Building, 11 ... Substructure, 12 ... Damper, 13 ... Base plate, 14 ... Rib plate, 15 ... 1st support shaft, 16 ... Gusset plate, 17 ... Spherical bearing, 18 ... 2nd support shaft, 19 ... Bearing 20, gusset plate, 21 damper, 22 rotating bracket, 23 bracket body, 24 first shaft body, 25 second shaft body, 26, sliding bearing, 27 first shaft hole, 28. 2nd shaft hole, 29 ... presser plate, 30 ... bolt, 31 ... base plate, 32 ... rib plate, 33 ... space, 34 ... base plate, 35 ... rib plate, 36 ... space, 37 ... reinforcing plate, 50 ... lower part Bracket, 51 ... upper bracket, 52 ... cable.

Claims (5)

In the vibration control device that suppresses mutual vibration by connecting both ends of the damper with rotating brackets between the substructure and the building,
The rotating bracket is fitted in the thickness direction in the space of the two ribs plate provided at an end portion of the damper, fitted in the width direction into two spaces in the rib plate provided on the lower construction body The bracket body,
A first shaft body rotatably fitted in a first shaft hole penetrating the thickness direction of the bracket body and two rib plates provided at the end of the damper;
Rotates from two rib plates provided in the lower structure to a second shaft hole formed in the width direction of the bracket main body and perpendicular to the first shaft hole and halfway on both sides of the bracket of the lower structure It consists of two second shaft bodies fitted freely,
The second shaft body has a step of a large diameter portion that fits into the second shaft hole of the rib plate provided in the lower building body and a medium diameter portion that fits into the second shaft hole of the bracket body. Consisting of axes,
The vibration control device is characterized in that the other end of the damper and the rotating bracket at the connecting portion of the building are configured in the same manner. The second shaft body has a three-stage structure including a large-diameter portion that is fitted to a rib plate provided in the lower structure, a medium-diameter portion that is fitted to the bracket body, and a small-diameter screw portion that is screwed to the bracket body. The vibration damping device according to claim 1, wherein the vibration damping device comprises a shaft, and the other end of the damper and the rotating bracket at the connecting portion of the building are configured similarly. The vibration damping device according to claim 1 or 2 , wherein the bracket body is a thick octagonal prism body . Both end portions of the first shaft body, and fixedly retaining in Ategai bolts holding plate on the outer surface of the rib plates of their respective, one end of each of the second shaft, the outer surface of the Li blanking plate 4. The vibration damping device according to claim 1, wherein the holding plate is fixed with a bolt to prevent it from coming off. 4. The vibration damping device according to claim 1, wherein the first shaft body and the second shaft body are fitted to each inner periphery of the first shaft hole and the second shaft hole via a slip bearing. apparatus.