JPH08303055A - Shock absorbing damper - Google Patents

Abstract

PURPOSE: To prevent a main component from being damaged or broken by providing a damper between opposite structural members, having metal pipe parts to which equal torsional moments are applied so as to occur torsional deformation in their cross-sections in order to absorb relative displacement between the structural components. CONSTITUTION: A damper mechanism 21a on the structure A side is composed of a metal pipe 1a supported on a pedestal 9a of the structure A, restrained at its lower end from rotating, by means of a restraining plate 4a through the intermediary of a steel plate 3a, journalled at its upper end by a bearing 5a, and connected to a steel pipe member 2a through the intermediary of flanges 6a, 6b, and a lever arm 10a secured at its proximal end to the steel pipe member 2a and horizontally extended so as to direct its distal end toward the structure B side, and similarly on the structure B side, a damper mechanism 21b is composed of a metal pipe 1b supported on a pedestal 9b, and restrained at its lower end from rotating, by means a restraining plate 4b, and connected at its upper end to a steel pipe member 2b, and a lever frame 10b. The lever frames 10a, 10b of the damper mechanisms 21a, 21b of both structures A, B are engaged at their distal ends with each other. With this arrangement, a relative horizontal displacement between both structures A, B is allowable, and thereby it is possible to prevent longitudinal relative displacement.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a buffer damper interposed between two structures such as a cylinder and a supporting tower in a steel chimney, or a boiler and its supporting frame in a steam generator, and more particularly to a structure. The present invention relates to a buffer damper that is interposed between parts that cause relative displacement with each other.

[0002]

2. Description of the Related Art FIG. 6 is a horizontal sectional view of a conventional cushioning damper arranged between two structures, and FIG. 7 is a detailed view thereof.

In FIG. 6, reference numeral 11 denotes a conventional buffer damper, which comprises a ring frame 3 wound around the outer surface of a cylindrical structure A which is one structure, and a support frame B which is another structure. They are arranged symmetrically between them. 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 is restrained from rotating by a restraint plate 15, and the upper end thereof is connected to a steel pipe member 17 pivotally supported by a pair of bearings 18 projecting from the structure A, and a metal pipe 14.
The base end is fixed to the steel pipe member 17, and the tip is provided with the lever arm 12 extending toward the support frame B side. Further, one support frame B side is provided with a pair of stoppers 13 which are installed on the support frame B and which sandwich the rod body 20 hung vertically from the tip end to the lever arm 12 and are connected to the structure A. When a relative displacement in the horizontal direction occurs between the support frames B, a torsion moment is transmitted to the metal pipe 14 via the lever arm 12 and a torsional deformation occurs in the cross section of the metal pipe 14, and the torsional deformation causes the relative displacement. It is supposed to be absorbed.

At this time, the torsional strength of the metal tube 14 is set to be smaller than that of any other member. When a large earthquake receives a torsional moment larger than this torsional strength, the cross section of the metal tube 14 yields, which occurs. The plastic deformation that occurs absorbs the vibrational energy of the entire structure and reduces the seismic response of the structure.

[0005]

As described above, the conventional buffer damper of this type causes a plastic deformation by applying a torsion moment to the cross section of the metal tube 14 which is set to be the weakest as compared with other members, thereby causing plastic deformation. It absorbs the vibration energy that acts on the structure due to deformation and suppresses damage and destruction of the structure body, and the torsional deformability of the cross section of the metal tube 14 (the plastic deformation area before the destruction beyond the yield point) is The larger the value, the larger the absorbed plastic deformation energy.

Therefore, it is desirable to set the cross-sectional dimension of the metal tube 14 as large as possible, but since it is necessary to design in consideration of the balance in strength with other members, the conventional buffer damper is constant in increasing the torsional deformability. There was a limit.

In view of the above problems, it is an object of the present invention to provide a buffer damper having an increased plastic deformation energy absorption capacity as compared with the conventional one.

[0008]

The structure of a buffer damper according to the present invention for achieving the above object is a buffer damper interposed between two structures facing each other, and one end of each of the structures is located on the side of each structure. A metal tube part which is connected to a tube body which is rotatably supported by the other end and whose other end is restrained from rotating by the structure, and a structure side whose base end is fixed to the tube body and whose front end faces each other. A damper mechanism composed of a lever portion extending to each of the above members is provided to set the torsional proof stress of each of the metal pipe portions to be smaller than the yield proof strength of any of the other members. It is characterized by being combined.

[0009]

[Operation] When horizontal relative displacement occurs between two opposing structures, a torsional moment of the same magnitude acts on each metal pipe through the lever part of the damper mechanism installed on each structure side. Torsional deformation occurs in each of the cross sections, and the relative displacement between the structures is absorbed by the torsional deformation (plastic deformation) of the two cross sections, and the plastic deformation energy absorption capacity is doubled as compared with the conventional one.

[0010]

Preferred embodiments of the present invention will now be described with reference to the drawings, but the present invention is not limited thereto.

FIG. 1 is a plan view of the shock absorber according to the present invention arranged between two structures, FIG. 2 is a partial view of II of FIG. 1 showing the structure of the shock absorber, and FIG. 3 is a lever arm structure. 2 is a view showing a first embodiment of the present invention, taken along the line III-III in FIG. 2, FIG. 4 is a view showing the second embodiment of the same taken along the line III-III, and FIG. It is a perspective view.

As shown in FIGS. 1 and 2, the buffer damper 21 according to this embodiment has two opposing structures A and B.
One end is connected to the steel pipe members 2a and 2b as a pipe body which is rotatably supported by the structures A and B via bearings 5a and 5b, and the other end. Are metal tubes 1a, 1b whose rotation is restricted by the structures A, B
And a damper mechanism 21 having a base end fixed to the steel pipe members 2a, 2b, and a lever arm 10a, 10b as a lever portion whose tip extends toward the facing structure.
a and 21b are provided respectively, and the metal tubes 1a,
The torsional proof stress of 1b is set to be smaller than the yield proof stress of any of the other members, and the damper mechanisms 21a, 21b described above
The lever arms 10a and 10b are engaged with each other at their tips to stop the rotation of each metal tube portion based on the relative displacement between the two structures A and B.

That is, as shown in FIG. 2, the damper mechanism 21a on one structure A side is supported by a pedestal 9a provided on the structure A, and the lower end of the damper mechanism 21a is restrained by a rigid plate 3a.
The rotation is restrained by a, the steel pipe member 2a whose upper end is axially supported by a pair of bearings 5a protruding from the structure A, and the metal pipe 1a connected via flanges 6a and 6b, and its base end are The lever arm 10a is fixed to the steel pipe member 2a and has a tip extending horizontally toward the structure B side.

On the other hand, the damper mechanism 21b on the structure B side
Is supported by a pedestal 9b provided on the structure B as in the above,
A pair of bearings 5b whose lower end is restrained from rotating by a restraint plate 4b via a rigid plate 3b and whose upper end is projectingly provided on the structure B
Steel pipe member 2b and flanges 7a, 7b pivotally supported by
It is composed of a metal pipe 1b connected via a metal pipe 1b, a base end of which is fixed to a steel pipe member 2b, and a front end of which extends horizontally to the structure A side.

As shown in FIG. 2, the tip portions of the lever frames 10a and 10b of the left and right damper mechanisms 21a and 21b shown in FIG. I am fit.

FIG. 3 shows a first embodiment relating to the engaged state. As shown in the figure, in the present embodiment, the lever frame 10b on the side of the one structure B has a box-shaped cross section, and the other internal structure A is formed in the opening portion thereof. The distal end of the lever frame 10a, which is the side, is loosely fitted and inserted. As a result, the relative horizontal displacement in the opposing direction between the two structures A and B is allowed,
Relative displacement in the front-back direction (the direction perpendicular to the paper surface of FIG. 2) is prevented.

FIG. 4 also shows a second embodiment related to the engaged state, in which the upper and lower walls of the tip end of the box-shaped lever arm 10a on the side of the above-mentioned one structure B are cut off to form a lever. The arm 10b is formed, and the structure A is formed in the central space.
The side lever arm 10a is loosely fitted and inserted.

With the structure shown in FIGS. 3 and 4, relative horizontal displacement in the opposing direction and relative displacement in the vertical direction, which occur between the two structures A and B, are allowed, and the longitudinal direction (the direction perpendicular to the plane of FIG. 2). Only the relative displacement of is blocked.

FIG. 5 is an IV of FIG. 2 showing a restrained state of the metal pipe.
-IV is a view from the arrow. As shown in the figure, the damper mechanism 2
Rigid plate 3b of metal tube 1b of No. 1 and pedestal 9b supporting this
An example of a restrained state with the upper restraint plate 4b is shown. A restraint plate 4b having a shape corresponding to the corner portion is provided at each corner portion of the quadrangular rigid plate 3b, whereby the rotation of the metal plate 1b is restrained. The metal pipe 1a of the damper mechanism 21, which is one of the structures, is also the same, and the description thereof is omitted.

The metal pipes 1a of the above-mentioned damper mechanisms are
The strength of 1b is the same as all other members constituting the damper mechanism, that is, the lever arms 10a and 10b, the steel pipe members 2a and 2
b, flanges 6a, 6b and 7a, 7b, restraint plate 4a,
4b, the rigid plates 3a, 3b, etc. are set to be weaker.

The operation of the buffer damper of the present invention will be described below.

When a relative horizontal displacement occurs in the front-back direction (the direction perpendicular to the paper surface of FIG. 2) between the two opposing structures A and B,
Steel pipe member 2a on the structure A side and steel pipe member 2b on the structure B side via lever arms 10a and 10b engaging with each other.
The same amount of torsion moment acts on each. This twisting moment is caused by the connected metal tubes 1a, 1
b is transmitted to the metal pipes 1a, 1b to give a rotating action, and the rotation is restrained by the rigid plates 3a, 3b.
This is blocked by b, which causes torsional deformation in the cross sections of the metal tubes 1a and 1b.

Further, in the above, when the relative displacement between the structures A and B further increases and the torsional moment acting accordingly increases, the cross sections of the metal pipes 1a and 1b are finally plastically deformed as full-section shear yield. At this time, plastic deformation occurs in the cross sections of the metal pipe 1a on the structure A side and the metal pipe 1b on the structure B side, and the energy absorption capacity is doubled. The vibration response is reduced and damage to or destruction of the main components of the structure is prevented.

The metal pipes 1a, 1b due to a large earthquake, etc.
If the plastic deformation of the cross-section greatly progresses, the steel pipe member 2
flanges 6a, 6b or 7a connecting a and 2b,
By releasing 7b, it can be replaced with a new metal tube.

[0025]

As described above in detail, according to the buffer damper of the present invention, the tip ends of the lever portions of the damper mechanisms provided between the structures are engaged with each other, and By preventing the rotation of each metal pipe part based on the relative displacement between the two structures, when a relative horizontal displacement occurs between two opposing structures, the lever part of the damper mechanism provided on each structure side is used. The same magnitude of torsional moment acts on each metal tube, and the same magnitude of torsional deformation occurs in each cross section, and due to the doubled torsional deformation (plastic deformation) occurring in these two sections, a large earthquake occurs. The vibration energy of the structure is absorbed, and the main members of the structure are prevented from being damaged or destroyed.

[Brief description of 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 structure of a buffer damper.

FIG. 3 is a II of FIG. 2 showing the first embodiment of the lever arm structure.
FIG. 3 is a view taken in the direction of arrows I-III.

FIG. 4 is a III-III arrow view of FIG. 2 showing the second embodiment of the same.

FIG. 5 is a VV arrow view of FIG. 2 showing a restrained state of the metal pipe.

FIG. 6 is a view showing a conventional buffer damper structure and its arrangement.

FIG. 7 is a view 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 Restraint plate 5a, 5b Bearing 6a, 6b, 7a, 7b Flange 8a, 8b Ring 9a, 9b Cradle 10a, 10b Lever arm 21 Buffer damper A , B structure

Front page continued (72) Inventor Manabu Fujishiro 4-22 Kannon Shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture Mitsubishi Heavy Industries, Ltd. Hiroshima Research Laboratory (72) Inventor Kutonori Abiru 6-22 Kannon-shinmachi, Nishi-ku, Hiroshima City, Hiroshima Prefecture No. Mitsubishi Heavy Industries, Ltd. Hiroshima Research Institute

Claims (1)

[Claims] 1. A buffer damper interposed between two structures facing each other, wherein one end of each of the structures is connected to a tubular body rotatably supported by the structure, and the other end is connected to the structure. Each of the metal pipes is provided with a damper mechanism composed of a metal pipe part whose rotation is restrained by an object and a lever part whose base end is fixed to the pipe body and whose tip extends toward the opposite structure. A shock-absorbing damper, characterized in that the torsional proof stress of each part is set to be smaller than the yield proof stress of any other member, and the tips of the lever parts of the respective damper mechanisms are engaged with each other.