JP2010222904A - Damping device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a damping device easily installable in an existing wooden building by a simple structure with less number of parts while eliminating the need of adjusting the height to the height of the story. <P>SOLUTION: This damping device 1 includes a viscoelastic damper 2 comprising a pair of outer tube 3 and an inner tube 4 which are disposed on a straight line and overlapped with each other and a viscoelastic body 5 which is interposed in the overlapped portion of the outer tube 3 and the inner tube 4 and joined between the outer tube 3 and th inner tube 4 and a mounting metal fitting 8 which is affixed to a framework 30 through an outer wall 34 and which connects the outer tube 3 and the inner tube 4 of a the damper 2 on the outside of the outer wall 34 in the state of being fixed to the framework 30. The viscoelastic damper 2 is installed, with the mounting metal fitting 8, in a tilted state in which the damper diagonally crosses the frame surface of the framework 30 in front view from the joint parts between a column 33 and beams 31, 32 which form the framework 30. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vibration control device provided to add vibration control performance to an existing wooden building.

  Vibration control devices for damping horizontal vibrations generated in wooden buildings are usually installed at the same time when building wooden buildings, such as being built into walls. There is a growing interest and it may be adopted by existing works even for existing wooden buildings. In this case, considering the construction cost, construction period, influence on residents, etc., a vibration control device may be provided from the outside of the wooden building. For example, in Patent Document 1, a pair of upper and lower trapezoidal transmission members are fixed with a nail or the like from the outer surface of the outer wall via mounting brackets, one on the upper beam and the other on the lower beam. An invention of a vibration control device in which a hydraulic damper is erected, a stud (vertical frame) is attached to a transmission member via a bracket, a three-way frame is attached via a stud, and a decorative frame is fitted inside the three-way frame Are listed.

JP 2003-314082 A

  Since the conventional vibration control device is provided with a frame made up of a stud, a three-way frame, etc. in addition to the upper and lower transmission members and the hydraulic damper, the number of parts is large and the structure is complicated. Therefore, the construction work takes time and effort, and the cost is increased. In particular, since the floor height of a wooden building is often not constant, it is necessary to adjust the height of the vibration control device in advance or at the site, which further increases labor and cost.

  Therefore, the present invention has an object to provide a vibration control device that has a simple configuration with a small number of parts and does not require height adjustment according to the floor height, and can be easily constructed and realized at low cost. Is.

In order to achieve the above object, the invention according to claim 1 is a vibration control device that is attached to the frame of an existing wooden building from the outside of the outer wall,
A brace-type viscoelastic damper comprising a pair of input members arranged on a straight line and partly overlapping each other, and a viscoelastic body interposed between the overlapping portions of the input members and bonded between the input members, and an outer wall And mounting brackets that are fixed to the shaft assembly side and that are connected to the shaft assembly side and connect both input members of the brace-type viscoelastic damper to the outside of the outer wall, respectively. The viscoelastic damper is constructed in an inclined posture that obliquely crosses the frame surface of the shaft assembly in a front view from a joint portion between the column forming the shaft assembly and the horizontal member.
The “input member” includes not only a single member but also a plurality of members such as plate members parallel to each other. This also applies to the “mounting bracket”, and includes a case of a plurality of brackets. Further, the “shaft assembly side” includes not only columns and horizontal members forming the shaft assembly but also a foundation on which the shaft assembly is erected.
According to a second aspect of the present invention, in the structure of the first aspect, in the first-floor frame of the wooden building, one input member of the brace type viscoelastic damper is used as the joint portion, and the other input member. Are fixed to the foundation on which the shaft assembly is erected, respectively.
The invention according to claim 3 is characterized in that, in the configuration of claim 1 or 2, the mounting bracket fixed to the joint portion is fixed across the column and the horizontal member.
The invention according to claim 4 is characterized in that, in the structure according to any one of claims 1 to 3, the brace viscoelastic damper is installed symmetrically about the column.

According to the first aspect of the present invention, the brace type viscoelastic damper is installed on the outside of the outer wall via the mounting bracket, so that a simple configuration with a small number of parts is achieved and the height is adjusted to the floor height. Is also unnecessary. Therefore, it becomes possible to construct the existing wooden building easily at a low cost.
According to the second aspect of the present invention, in addition to the effect of the first aspect, by fixing the input member to the foundation, in the existing wooden building, the fixing of the foundation to the foundation is loosened, and the foundation is likely to rise from the foundation. Even in such a case, the deformation of the shaft group can be reliably input to the vibration control device.
According to invention of Claim 3, in addition to the effect of Claim 1 or 2, the attachment rigidity of a column and a horizontal member improves with an attachment metal fitting.
According to the fourth aspect of the invention, in addition to the effect of any one of the first to third aspects, it is not necessary to reinforce with a reinforcing metal fitting or the like at the joint where the brace viscoelastic damper is not connected.

It is explanatory drawing of the damping device of form 1, (A) shows a front and (B) shows a section, respectively. It is a partial expanded sectional view of the damping device of form 1. It is a front view which shows the example of a change of the damping device of form 1. It is explanatory drawing of the damping device of form 2, (A) shows a front and (B) shows a section, respectively. It is a partial expanded sectional view of the damping device of form 2. It is a front view which shows the example of a change of the damping device of form 2. It is an enlarged view of the joint part of the pillar and beam in FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Form 1]
The seismic control device 1 shown in FIG. 1 is constructed from the outside of an outer wall 34 with respect to a shaft assembly 30 formed of a beam 31 and a base 32 as horizontal members and a pillar 33 in an existing wooden building. . Here, a pair of upper and lower brace-type viscoelastic dampers 2 and 2 (in the case of distinguishing between the upper and lower sides, 2 (A) and 2 (B)) are connected to the upper and lower joints of the central column 33 and This is a so-called K-shaped arrangement that is symmetrical with respect to the vertical axis between the middle part of the left column 33. 35 is the foundation.

  First, as shown in FIG. 2, a brace-type viscoelastic damper (hereinafter simply referred to as “viscoelastic damper”) 2 is arranged on a straight line and has an outer tube 3 having a rectangular cross section serving as one input member, The outer tube 3 has a rectangular cross section that is slightly smaller than the outer tube 3, and the inner tube 4 as the other input member that is coaxially and partially loosely inserted into the outer tube 3 from one end side, It consists of, for example, a styrene-based viscoelastic body (portion shown by hatching in FIG. 1B and FIG. 2) 5 which is interposed over the entire surface between the tubes 3 and 4 and is bonded to the surface facing both tubes. Connection fittings 6 and 7 are welded to the end portions of the outer tube 3 and the inner tube 4 attached to the shaft assembly 30 in an extended manner.

In addition, the viscoelastic damper 2 is connected to the shaft set 30 via the mounting brackets 8 and 8 at the coupling brackets 6 and 7 at both ends, respectively. This connection structure will be described in detail at the joint between the beam 31 and the column 33 to which the viscoelastic damper 2 (A) is connected.
As shown in FIG. 2, the mounting bracket 8 includes a pair of circular brackets 9 and 9 that are mounted at two positions of the beam 31 and the pillar 33 through a through hole 36 formed in the outer wall 34, and the circular bracket. It consists of the plate-shaped metal fitting 10 laid over the vertical direction across 9,9. The circular metal fitting 9 has a cap shape that opens to the shaft assembly 30 side and has a flange 11 around the periphery thereof, and has a bolt 12 penetrating from the opening side to the center position. By screwing the wood screws 13, 13,..., The screw portion of the bolt 12 is fixed in a state of protruding to the front side. In this fixed state, the end surface of the circular metal fitting 9 protrudes more to the front side than the outer surface of the outer wall 34.

  Next, the plate-shaped metal fitting 10 has a central portion protruding in a convex shape toward the front side, and a bolt 14 is passed through the central portion from the back side, and bolts are attached to both end portions that contact the end surfaces of the circular metal fittings 9 and 9. 12 is penetrated, and the nut 15 is fastened, so that the threaded portion of the bolt 14 is fixed to the front side. That is, the plate-like metal fitting 10 is fixed across the beam 31 and the column 33 via the circular metal fittings 9 and 9. One end of the viscoelastic damper 2 (A) is connected by passing the bolt 14 through the connecting fitting 6 of the viscoelastic damper 2 (A) and fastening the nut 16.

  The same applies to the middle part of the column 33 to which the other end of the viscoelastic damper 2 (A) is connected, and a pair of circular fittings 9, 9 are provided above and below the column 33 through the through holes 36 of the outer wall 34. Is mounted between the circular metal fittings 9 and 9, the bolt 14 of the plate metal fitting 10 is passed through the connecting metal fitting 7 of the viscoelastic damper 2 (A), and the nut 16 is fastened. The other end of the viscoelastic damper 2 (A) is connected.

These connection structures are the same in the lower viscoelastic damper 2 (B), but here, the circular fittings 9 and 9 of the mounting fitting 8 are formed at the joint portion between the base 32 and the pillar 33. Each of the base 32 and the pillar 33 is attached through a through-hole 36, and the plate-like metal fitting 10 is installed in the vertical direction across the circular metal fittings 9 and 9 so as to adhere to the bolts 14 of the plate-like metal fitting 10. One connection fitting 6 of the elastic damper 2 (B) is fixed.
In the installed state of these viscoelastic dampers 2, 2, the viscoelastic dampers 2, 2 have a predetermined gap with the outer surface of the outer wall 34, and an inclined posture that obliquely crosses the frame surface of the shaft assembly 30 in a front view. It has become.

In the vibration damping device 1 configured as described above, after confirming the positions of the beam 31, the base 32, and the pillar 33 in the shaft set 30, the through holes 36 are formed at positions corresponding to the mounting brackets 8, 8,. , 36 .. are drilled. At this time, the through hole 36 formed in the intermediate portion of the column 33 may be determined in the vertical position along the column 33 according to the length of the viscoelastic dampers 2 and 2.
Then, as described above, the circular metal fitting 9 is attached at the position of the through hole 36 and the plate metal fitting 10 is installed, and the viscoelastic dampers 2 and 2 are installed between the bolts 14 and 14 of the plate metal fitting 10, respectively. The installation of the vibration control device 1 is completed. Therefore, if the viscoelastic damper 2 is produced in advance as a unit, the viscoelastic damper 2 can be installed only by drilling the through hole 36 and attaching the mounting bracket 8 at the site.

  In the shaft assembly 30 to which the vibration control device 1 is attached in this way, when a horizontal external force is repeatedly applied to the shaft assembly 30 due to an earthquake or the like, the upper and lower viscoelastic dampers 2 and 2 are compressed and tensioned in the axial direction. The force acts alternately, and the outer tube 3 and the inner tube 4 operate in opposite axial directions. By this operation, the viscoelastic body 5 is sheared to cause a damping action.

Thus, according to the vibration damping device 1 of the first aspect, a pair of the outer tube 3 and the inner tube 4 that are arranged on a straight line and partially overlap each other, and the polymerization of the outer tube 3 and the inner tube 4 The viscoelastic damper 2 including the viscoelastic body 5 interposed between the outer tube 3 and the inner tube 4 and the outer wall 34 is fixed to the shaft set 30 and fixed to the shaft set 30. And a mounting bracket 8 for connecting the outer tube 3 and the inner tube 4 of the viscoelastic damper 2 in the state on the outside of the outer wall 34, respectively. The mounting bracket 8 allows the viscoelastic damper 2 to be connected to the pillar 33 forming the shaft assembly 30. And the beams 31 and 32 are installed in an inclined posture that obliquely crosses the frame surface of the shaft assembly 30 when viewed from the front, resulting in a simple configuration with a small number of parts and a height that matches the floor height. No need for adjustment. Therefore, it becomes possible to construct the existing wooden building easily at a low cost.
In particular, here, the mounting bracket 8 fixed to the joint is fixed across the column 33 and the horizontal members (beams 31 and 32), so the mounting bracket 8 improves the mounting rigidity of the joint. There are advantages to doing.

  In the first aspect, the viscoelastic dampers 2 (A) and 2 (B) are arranged in a K shape with respect to the shaft set 30. As shown in FIG. 3, the four viscoelastic dampers 2, 2... May be arranged so as to be symmetrical with respect to the center column 33. In this case, between the left and right viscoelastic dampers 2 (A), 2 (A) and between the viscoelastic dampers 2 (B), 2 (B), the adjacent connecting fittings 7, 7 are intermediate between the columns 33. It will be simultaneously fastened to the bolts 14 of the plate-like metal fitting 10 provided at the site.

Such a symmetrical arrangement has the following advantages in addition to improved seismic performance.
In the K-shaped arrangement of FIG. 1, in order to efficiently input the deformation of the shaft assembly 30 to the vibration control device 1, the left column 33 to which the viscoelastic dampers 2 and 2 are not connected, the beam 31 and the base 32 are connected to the joint portion. However, in the symmetrical arrangement, the plate-like metal fittings 10 are all provided at the four corners of the joints 33, the beams 31, and the pillars 33. And the base 32 are attached to prevent the pillar 33 from coming off at the same time, so that reinforcement by a reinforcing metal fitting or the like becomes unnecessary.

[Form 2]
Next, another embodiment of the present invention will be described. However, the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted.
In the vibration control device 1a shown in FIG. 4, one viscoelastic damper 2 is disposed in an inclined posture obliquely downward from the joint portion between the beam 31 and the column 33. In the joint portion, the inner pipe 4 The side connection fitting 7 is connected by the attachment fitting 8. On the other hand, on the outer tube 3 side, a long pipe 17 is interposed between the outer tube 3 and the connecting bracket 6, and the connecting bracket 6 at the tip is attached to the mounting bracket via a notch 18 provided at the lower end of the outer wall 34. It is connected to the foundation 35 by 8a.
As shown in FIG. 5, the mounting bracket 8 a includes a horizontal plate-like metal fitting 10 with a bolt 14 penetrating from the back side at the center, and a pair of chemical anchors that fix both ends of the plate-like metal fitting 10 to the foundation 35. 19, 19, and the connecting bracket 6 can be connected to the foundation 35 by passing the tip of the bolt 14 through the connecting bracket 6 and fastening with the front and rear nuts 20, 20.

  In the vibration damping device 1 a configured as described above, the positions of the pillars 33 and the beams 31 are confirmed on the upper side of the shaft set 30, and the through holes 36 are formed in the corresponding positions of the outer wall 34. Install. On the other hand, on the lower side of the shaft assembly 30, the position of the notch 18 of the outer wall 34 and the mounting position of the mounting bracket 8a on the foundation 35 are determined in accordance with the length of the viscoelastic damper 2 (position of the connecting bracket 6). The plate-like metal fitting 10 is fixed to the foundation 35 with chemical anchors 19 and 19. In this case, the mounting position of the mounting bracket 8a may be slid in the left-right direction according to the floor height.

  The connecting bracket 7 of the viscoelastic damper 2 is connected to the bolt 14 of the plate-shaped bracket 10 in the mounting bracket 8 on the upper side of the shaft group 30, while the bolt of the plate-shaped bracket 10 in the mounting bracket 8 a is connected to the lower side of the shaft group 30. If the connecting metal fitting 6 is connected to 14, the attachment of the vibration control device 1a is completed. In this state, the viscoelastic damper 2 has a predetermined gap with the outer surface of the outer wall 34, and has an inclined posture that crosses the frame surface of the shaft assembly 30 obliquely downward from the upper left joint. Therefore, if the viscoelastic damper 2 and the pipe 17 are prepared in advance, the viscoelastic damper 2 can be installed on the site only by drilling the through hole 36 and attaching the mounting brackets 8 and 8a.

  In the shaft assembly 30 to which the vibration control device 1a is attached in this manner, when horizontal external force is repeatedly applied to the shaft assembly due to an earthquake or the like, compressive force and tensile force are alternately applied to the viscoelastic damper 2 in the axial direction. By acting, the outer tube 3 and the inner tube 4 operate in opposite axial directions. By this operation, the viscoelastic body 5 is sheared to cause a damping action.

As described above, also in the vibration damping device 1a of the second embodiment, the elastic damper 2 is installed outside the outer wall 34 via the mounting brackets 8 and 8a, so that the number of parts is reduced and the floor height is increased. No height adjustment is required. Therefore, it becomes possible to construct the existing wooden building easily at a low cost.
In particular, here, since the inner tube 4 of the viscoelastic damper 2 is fixed to the upper joint portion and the outer tube 3 is fixed to the foundation 35 via the pipe 17, the foundation 32 for the foundation 35 in the existing wooden building is provided. Even when the base is loosened and the base 32 is easily lifted from the foundation 35, the deformation of the shaft assembly 30 can be reliably input to the vibration control device 1a.

In the second embodiment, the pipe 17 is connected to the outer tube 3 of the viscoelastic damper 2 to make it long. However, as shown in FIG. 6, the inner tube 4 may be made long and long.
FIG. 6 also illustrates a left-right symmetrical arrangement of the viscoelastic dampers 2 and 2. That is, the connecting fittings 6 of the outer pipes 3 of the left and right viscoelastic dampers 2 and 2 are connected to the joints of the central column 33 and the beam 31 respectively, and the viscoelastic dampers 2 and 2 are separated from each other. It is arranged in the shape of a letter C as an inclined posture. However, in the joint portion between the column 33 and the beam 31, the circular metal fitting 9 is attached to three portions of the beam 31 directly above the column 33 and the left and right sides as shown in FIG. The metal fitting 21 includes a contact portion 22 through which the bolt 12 of the circular metal fitting 9 passes and contacts the end surface of the circular metal fitting 9, and a pair of protruding portions 23 through which the bolt 14 passes by protruding to the front side between the contact portions 22. , 23 are alternately formed. Therefore, each connection metal fitting 6 is separately connected to the bolts 14 and 14 divided into the left and right.

And in common with modes 1 and 2, the viscoelastic damper is not limited to one using an outer tube and an inner tube as input members, but one or more plate-like members and the other alternate with the plate-like members. A laminated type in which a viscoelastic body is bonded between the two plate-like members can also be adopted as one or a plurality of plate-like members to be polymerized.
In addition, the mounting bracket is configured by combining a circular bracket and a plate-shaped bracket. However, the design of each bracket can be changed, and a structure in which the circular bracket and the plate-shaped bracket are integrated may be adopted. On the contrary, a structure in which three or more metal fittings are combined can also be used.
In addition, in Embodiments 1 and 2 described above, the vibration control device is applied to the first floor frame of the wooden building. However, the vibration control device of the present invention is also applicable to a second or higher frame frame. is there.

  1, 1a ... Damping device, 2. Brace type viscoelastic damper, 3. Outer pipe, 4. Inner pipe, 5. Viscoelastic body, 6, 7. Connection bracket, 8, 8a Mounting bracket, 9 ... Round bracket, 10, 21 ... Plate fitting, 12, 14 ... Bolt, 17 ... Pipe, 19 ... Chemical anchor, 30 ... Shaft assembly, 31 ... Beam, 32 ... Base, 33 ... Pillar, 34 ... Exterior wall, 35 ... Foundation, 36 ... Through hole.

Claims (4)

A seismic control device attached to the frame of an existing wooden building from the outside of the outer wall,
A brace-type viscoelastic damper comprising a pair of input members arranged on a straight line and partially overlapping each other, and a viscoelastic body interposed between the input members and bonded between the input members;
Mounting brackets that pass through the outer wall and are fixed to the shaft assembly side, and that connect both input members of the brace-type viscoelastic damper on the outside of the outer wall in a fixed state to the shaft assembly side,
The brace viscoelastic damper is installed by the mounting bracket in an inclined posture that obliquely crosses the frame surface of the shaft assembly in a front view from a joint portion between a column and a horizontal member forming the shaft assembly. A vibration control device characterized by   In the first floor frame of the wooden building, one input member of the brace type viscoelastic damper is used as the joint, and the other input member is used as a foundation on which the shaft is erected. The vibration control device according to claim 1, wherein each of the vibration control devices is fixed to each other.   The vibration control device according to claim 1 or 2, wherein the mounting bracket fixed to the joint portion is fixed across the column and the horizontal member.   The vibration control device according to any one of claims 1 to 3, wherein the brace viscoelastic damper is installed symmetrically about a column.

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