JP3576265B2 - Buffer damper - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a buffer damper interposed between two structures, such as a tubular body and a supporting tower in a steel chimney, or a boiler and its supporting frame in a steam generator, and particularly, in a structure, relative displacement between the two structures. The present invention relates to a shock absorbing damper interposed between generated portions.
[0002]
[Prior art]
FIG. 6 is a horizontal sectional view when a conventional buffer damper is arranged between two structures, and FIG. 7 is a detailed view thereof.
[0003]
In FIG. 6, reference numeral 11 denotes a conventional buffer damper, which is symmetrical between a ring frame 3 wound around the outer surface of a cylindrical structure A as one structure and a support frame B as another structure. It is arranged in a way.
As shown in FIG. 7, the buffer damper 11 is supported on the structure A side by the ring frame 3 of the structure A and the pedestal 3a.
The lower end 16 has a metal pipe 14 connected to a steel pipe member 17 whose rotation is restrained by a restraining plate 15 and whose upper end is supported by a pair of bearings 18 projecting from the structure A. The lever arm 12 has an end fixed to the steel pipe member 17 and an end extending toward the support frame B.
In addition, on one support frame B side, a pair of stoppers 13 that are installed on the support frame B and sandwich the rod body 20 suspended from the tip of the lever arm 12 from the tip are provided. When a relative displacement in the horizontal direction occurs between the supporting frames B, a torsional moment is transmitted to the metal tube 14 via the lever arm 12, and a torsional deformation occurs in the cross section of the metal tube 14, and the relative displacement is caused by the torsional deformation. It is designed to be absorbed.
[0004]
At this time, the torsional strength of the metal tube 14 is set to be smaller than any other members. When a large earthquake receives a torsional moment greater than the torsional strength, the cross section of the metal tube 14 yields and the plastic deformation generated at that time occurs. As a result, the vibration energy of the entire structure is absorbed, and the seismic response of the structure is reduced.
[0005]
[Problems to be solved by the invention]
As described above, this type of conventional shock damper generates a plastic deformation by applying a torsional moment to the cross section of the metal tube 14 which is set to be weakest than other members, and the vibration energy acting on the structure due to the plastic deformation is generated. To prevent damage and destruction of the main body of the structure. The greater the torsional deformability of the cross section of the metal pipe 14 (the area of plastic deformation before breaking beyond the yield point), the greater the plastic deformation energy absorbed. growing.
[0006]
Therefore, it is desirable to set the cross-sectional dimension of the metal tube 14 as large as possible. However, since a design in consideration of the balance with the strength of other members is required, a certain limit is imposed on the conventional buffer damper in order to increase the torsional deformability. there were.
[0007]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a shock absorbing damper having an increased plastic deformation energy absorbing capacity as compared with the related art.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a buffer damper according to the present invention has a structure in which, in a buffer damper interposed between two opposing structures, one end of each of the structures is rotatably supported by the structure. A metal tube portion connected to the body and the other end of which is restrained from rotating by the structure, and a lever portion whose base end is fixed to the tube body and whose distal end extends toward the opposing structure. A damper mechanism is provided, the torsional strength of each of the metal pipes is set to be smaller than the yield strength of any of the other members, and the ends of the levers of each of the damper mechanisms are engaged with each other. .
[0009]
[Action]
When a horizontal relative displacement occurs between two opposing structures, the same magnitude of torsional moment acts on each of the metal pipes via the lever portion of the damper mechanism installed on each structure side, and each of the metal tubes has a corresponding torsion moment. A torsional deformation occurs in the cross section, and the relative displacement between the structures is absorbed by the torsional deformation (plastic deformation) of the two cross sections, so that the plastic deformation energy absorbing capacity is doubled as compared with the related art.
[0010]
【Example】
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings, but the present invention is not limited thereto.
[0011]
FIG. 1 is a plan view of a case where the shock absorbing damper of the present invention is disposed between two structures, FIG. 2 is a II-part view of FIG. 1 showing the structure of the shock absorbing damper, and FIG. 3 is a first embodiment of the lever arm structure. FIG. 4 is a view taken in the direction of arrows III-III in FIG. 2, FIG. 4 is a view taken in the direction of arrows III-III in FIG. 2 showing the second embodiment, and FIG. 5 is a view taken in the direction of arrow VV in FIG. FIG.
[0012]
As shown in FIGS. 1 and 2, the buffer damper 21 according to the present embodiment is interposed between two opposing structures A and B, and one end of the damper 21 is attached to the structures A and B by a bearing 5 a. , 5b are connected to steel pipe members 2a, 2b as rotatably supported pipe bodies, and the other ends thereof are metal pipes 1a, 1b whose rotation is restricted by the structures A, B, Damper mechanisms 21a, 21b each having a base end fixed to the steel pipe member 2a, 2b and a lever arm 10a, 10b as a lever portion extending at the distal end toward the opposing structure are provided, respectively. The two structures are formed by setting the torsional strength of the metal tubes 1a and 1b smaller than the yield strength of any of the other members and engaging the tips of the lever arms 10a and 10b of the damper mechanisms 21a and 21b with each other. Things A, B It is made so as to stop the rotation of each metal pipe section based on the relative displacement.
[0013]
That is, as shown in FIG. 2, the damper mechanism 21a on one side of the structure A is supported by a receiving table 9a provided on the structure A, and its lower end is restrained from rotating by a restraining plate 4a via a rigid plate 3a. The steel pipe member 2a is supported at its upper end by a pair of bearings 5a projecting from the structure A, the metal pipe 1a is connected to the steel pipe member 2a via flanges 6a and 6b, and the base end is fixed to the steel pipe member 2a. And a lever arm 10a having a tip extending horizontally to the structure B side.
[0014]
On the other hand, the damper mechanism 21b on the structure B side is supported by the receiving table 9b provided on the structure B, the lower end thereof is restricted in rotation by the restraining plate 4b via the rigid plate 3b, and the upper end is the structure B, a metal pipe 1b pivotally supported by a pair of bearings 5b and a metal pipe 1b connected via flanges 7a and 7b, a base end of which is fixed to the steel pipe member 2b, and a tip of which is a structure. It consists of a lever frame 10b extending horizontally to the A side.
[0015]
Then, as shown in FIG. 2, the respective leading ends of the lever frames 10a and 10b of the left and right damper mechanisms 21a and 21b provided in the structures A and B are engaged with each other. I have.
[0016]
FIG. 3 shows a first embodiment according to the engaged state.
As shown in the drawing, in the present embodiment, the cross section of the lever frame 10b on the one structure B side is formed in a box shape, and the other internal structure A is formed in the opening inside thereof. The distal end of the lever frame 10a on the side is loosely fitted.
Thereby, relative horizontal displacement in the facing direction generated between the two structures A and B is allowed, and relative displacement in the front-back direction (vertical direction on the paper surface of FIG. 2) is prevented.
[0017]
FIG. 4 shows a second embodiment according to the engagement state, in which the upper and lower walls of the distal end of the box-shaped lever arm 10a on the above-mentioned one structure B side are cut off to remove the lever arm 10b. The lever A 10a on the side of the structure A is loosely fitted in the central space.
[0018]
With the configuration shown in FIGS. 3 and 4, the relative horizontal displacement in the facing direction and the relative displacement in the vertical direction that occur between the structures A and B are allowed, and the relative displacement in the front-rear direction (perpendicular to the plane of FIG. 2). Only to be blocked.
[0019]
FIG. 5 is a view taken in the direction of arrows IV-IV in FIG. 2 showing the restrained state of the metal tube.
As shown in the figure, an example of a restrained state of a rigid plate 3b of a metal tube 1b of a damper mechanism 21 and a restraint plate 4b on a receiving stand 9b supporting the same is shown.
At each corner of the rectangular rigid plate 3b, a restraining plate 4b having a shape corresponding to the corner is disposed, whereby the rotation of the metal plate 1b is restrained.
The same applies to the metal tube 1a of the damper mechanism 21 which is one of the structures, and a description thereof will be omitted.
[0020]
The strength of the metal pipes 1a and 1b of both damper mechanisms is determined by the strength of all other members constituting the damper mechanism, ie, the lever arms 10a and 10b, the steel pipe members 2a and 2b, the flanges 6a and 6b, and the restraining plates. 4a, 4b, and the strength of the rigid plates 3a, 3b are set to be weaker.
[0021]
Hereinafter, the operation of the buffer damper of the present invention will be described.
[0022]
When a relative horizontal displacement occurs between the two opposing structures A and B in the front-rear direction (perpendicular to the plane of FIG. 2), the steel pipe member 2a on the side of the structure A via the lever arms 10a and 10b engaged with each other. The same magnitude of torsional moment acts on the steel pipe member 2b on the structure B side.
This torsional moment is transmitted to the connected metal tubes 1a, 1b and gives a rotating action to the metal tubes 1a, 1b. This rotation is prevented by the restraining plates 4a, 4b via the rigid plates 3a, 3b, whereby Torsional deformation occurs in the cross section of the metal tubes 1a and 1b.
[0023]
In the above, when the relative displacement between the structures A and B further increases and the torsional moment acting accordingly increases, the cross section of the metal tubes 1a and 1b finally undergoes plastic deformation as full-section shear yielding. Plastic deformation occurs in the cross section of each of the metal tube 1a on the structure A side and the metal tube 1b on the structure B side, so that the energy absorption capacity is doubled, and the vibration response of the entire structure during a large-scale earthquake or the like is reduced. And damage or destruction to major components of the structure is prevented.
[0024]
When the plastic deformation of the cross section of the metal pipes 1a and 1b greatly progresses due to a large earthquake or the like, a new metal pipe is formed by releasing the flange 6a, 6b or 7a, 7b connecting the steel pipe members 2a, 2b. Can be exchanged.
[0025]
【The invention's effect】
As described in detail above, according to the shock absorbing damper of the present invention, the tip of the lever portion of each damper mechanism provided between the structures is engaged with each other, and the relative displacement between the two structures is When the relative horizontal displacement occurs between two opposing structures by suppressing the rotation of each metal tube based on the respective metal tubes, each metal tube is connected via a lever portion of a damper mechanism provided on each structure side. The same magnitude of torsional moment acts on each section, resulting in the same magnitude of torsional deformation on each section. The doubled torsional deformation (plastic deformation) occurring on these two sections causes the structural Vibration energy is absorbed, and the effect is obtained that damage or destruction of the main members of the structure is prevented.
[Brief description of the drawings]
FIG. 1 is a layout view of a buffer damper according to a first embodiment of the present invention.
FIG. 2 is a II-partial view of FIG. 1 showing a configuration of a buffer damper.
FIG. 3 is a view taken in the direction of arrows III-III in FIG. 2 showing the first embodiment of the lever arm structure.
FIG. 4 is a view taken in the direction of arrows III-III in FIG. 2 showing the second embodiment.
FIG. 5 is a view taken in the direction of arrows VV in FIG. 2 showing a restrained state of the metal tube.
FIG. 6 is a diagram showing a conventional buffer damper structure and its arrangement.
FIG. 7 is a diagram showing a conventional buffer damper structure and its arrangement.
[Explanation of symbols]
1a, 1b Metal tube 2a, 2b Steel tube member 3a, 3b Rigid plate 4a, 4b Restraining plate 5a, 5b Bearing 6a, 6b, 7a, 7b Flange 8a, 8b Ring 9a, 9b Receiving stand 10a, 10b Lever arm 21 Buffer damper A , B structure

Claims (1)

In a buffer damper interposed between two opposing structures,
A metal pipe portion having one end connected to a tube rotatably supported by the structure, and the other end restrained from rotating by the structure, on each structure side;
The base end is fixed to the above-mentioned pipe body, and the tip end is provided with a damper mechanism composed of a lever portion extending toward the facing structure side, respectively.
While setting the torsional proof strength of each of the metal pipe parts smaller than the yield strength of any other member,
A damper characterized by engaging the tips of the lever portions of the respective damper mechanisms.

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