JP4806247B2 - Damping structure for buildings - Google Patents

Description

  The present invention relates to a building damping structure for suppressing vibration of panel members such as a floor and a ceiling of a building.

An example of a configuration for suppressing vibration of a floor and a ceiling (particularly, a floor) in a building such as a house is disclosed in Patent Document 1 below. In the configuration disclosed in Patent Document 1, the dynamic damper is configured to include a mass having a predetermined mass and a rubber portion forming a spring system, and the value of the natural frequency is set within a range of 44 Hz to 88 Hz. It has. The dynamic damper is attached via a mounting bracket to the abdomen formed at the center of the small beam forming the steel house in a set of two. This dynamic damper suppresses the vibration of the beam, and consequently suppresses the vibration of the floor and ceiling.
JP 2004-3280 JP

  Such a dynamic damper is configured to attenuate the vibration of a specific frequency of the small beam by vibrating the mass attached to the spring system. Therefore, the mass of the mass and the mounting position of the dynamic damper vary depending on the vibration frequency of the beam to be damped, the shape of the beam, etc., and an accurate mass corresponding to the vibration frequency of the beam to be damped is selected. A sufficient vibration damping effect cannot be obtained unless the dynamic damper is attached to an appropriate position of the beam according to the vibration frequency of the beam to be damped.

  In view of the above fact, an object of the present invention is to obtain a building damping structure capable of effectively suppressing vibration of panel members such as a floor and a ceiling of a building.

The building damping structure according to the first aspect of the present invention is formed in a hollow shape in which a pair of flanges facing each other in the vertical direction are connected by a web, and one side in the width direction of the flange portion is opened. The pair of flanges are connected by a connecting portion provided on the opposite side of the web along the width direction of the pair of flanges to hold the intermediate portion in the longitudinal direction of the beam member that supports the panel member. An anti- skid material that fixes the member and makes the portion holding the beam member a node of vibration generated by the panel member and the beam member, and the connecting portion are integrally formed, and the connecting portion is the pair of the pair. In addition to having a bracket that is attached to the beam member by connecting a flange, an additional mass provided on the beam member corresponding to the antinode portion of the vibration is subjected to vibration generated in the beam member. By vibrating at a particular vibration and opposite phase, and a, and suppresses damper vibration caused by the beam member.

  In the building damping structure according to the first aspect of the present invention, the intermediate portion in the longitudinal direction of the beam member (that is, an arbitrary portion between the longitudinal ends of the beam member or a predetermined predetermined portion) is steady. Retained by the material. The beam member is fixed at the portion held by the steady rest material. Since the beam member is fixed at the portion held by the steady rest material in this way, the beam member cannot vibrate at this portion. Therefore, when the panel member and the beam member vibrate, the portion held by the steady rest material becomes a vibration node.

  If the magnitude of the external force input to the panel member and the beam member is the same, the amplitude of the vibration of the panel member and the beam member becomes smaller as the distance between the nodes is shorter. For this reason, the longitudinal direction middle part of a beam member, and the panel member corresponding to this part are formed with a node, so that only the longitudinal direction both ends of the beam member are nodes, and the panel member whose center in the longitudinal direction is an antinode The amplitude is smaller than the vibration of the beam member. Thereby, the amplitude of the vibration of the panel member supported by the beam member is reduced, and the vibration of the panel member is suppressed.

On the other hand, in the vibration damping structure for buildings according to the present invention, the above-mentioned beam member is configured to include a pair of flanges and a web, and generally has a hollow shape opened toward one side in the width direction of the flange. A beam member is formed. Furthermore, in the building damping structure according to the present invention, an additional mass body that constitutes a damper is arranged inside such a hollow beam member.

When the beam a vibration which fixed part by stopper member as a node member is vibrated, the additional mass body of the damper provided on the beam member so as to correspond to the portion of the belly of the vibration, of the vibration of the beam member, the specific It vibrates with a phase opposite to that of The vibration of the beam member is further suppressed by the antiphase vibration of the additional mass body, thereby suppressing the vibration of the panel member supported by the beam member.

Further, as described above, by arranging the additional mass body of the damper inside the beam member, it is possible to balance the weight without greatly deviating the weight toward one or the other side in the width direction of the flange. In addition, since at least a part of the damper is disposed inside the beam member, the protruding dimension of the damper attached to the beam member from the beam member is reduced, or the damper is completely accommodated in the beam member.

In the present invention, the inner side of the beam member means the inner side of the cross section of the beam member, and all of the additional mass bodies constituting the damper may be arranged inside the cross section of the beam member. A part of the mass body may protrude from the beam member.

Furthermore, in the vibration damping structure for buildings according to the present invention, the beam member opens on one side in the width direction of the flange, but the connecting portion connects the upper and lower flanges on the side opposite to the web. Thereby, the deformation | transformation which a flange contacts / separates mutually is prevented. For this reason, torsion or the like of the beam member due to such deformation of the flange is suppressed or prevented, and occurrence of vibration or the like due to torsion or the like of the beam member can be effectively suppressed or prevented.

Moreover, a connecting portion is integrally formed on the bracket constituting the damper, and the bracket is attached to the beam member by connecting the upper and lower flanges of the beam member by the connecting portion. For this reason, the operation | work for connecting the upper and lower flanges by a connection part and the operation | work for attaching a bracket to a beam member can be performed by 1 process.

The building damping structure according to the second aspect of the present invention is formed in a hollow shape in which a pair of flanges facing each other in the vertical direction are connected by a web and one side in the width direction of the flange portion is opened. The pair of flanges are connected by a connecting portion provided on the opposite side of the web along the width direction of the pair of flanges to hold the intermediate portion in the longitudinal direction of the beam member that supports the panel member. An anti-rest material that fixes the member and makes the portion holding the beam member a node of vibration generated in the panel member and the beam member, and a fixing portion fixed to the web from the inside of the beam member are integrated. And an additional mass body provided on the beam member corresponding to the antinode portion of the vibration, the bracket being attached to the beam member by fixing the fixing portion to the web. The out of vibration generated by the beam member by vibration at a particular vibration and opposite phase, are Bei Ete and a suppressing damper vibration caused by the beam member.

In the building vibration damping structure according to the second aspect of the present invention, the intermediate portion in the longitudinal direction of the beam member (that is, an arbitrary portion between the longitudinal ends of the beam member or a predetermined predetermined portion) is prevented. Retained by the material. The beam member is fixed at the portion held by the steady rest material. Since the beam member is fixed at the portion held by the steady rest material in this way, the beam member cannot vibrate at this portion. Therefore, when the panel member and the beam member vibrate, the portion held by the steady rest material becomes a vibration node.

If the magnitude of the external force input to the panel member and the beam member is the same, the amplitude of the vibration of the panel member and the beam member becomes smaller as the distance between the nodes is shorter. For this reason, the longitudinal direction middle part of a beam member, and the panel member corresponding to this part are formed with a node, so that only the longitudinal direction both ends of the beam member are nodes, and the panel member whose center in the longitudinal direction is an antinode The amplitude is smaller than the vibration of the beam member. Thereby, the amplitude of the vibration of the panel member supported by the beam member is reduced, and the vibration of the panel member is suppressed.

On the other hand, in the vibration damping structure for buildings according to the present invention, the above-mentioned beam member is configured to include a pair of flanges and a web, and generally has a hollow shape opened toward one side in the width direction of the flange. A beam member is formed. Furthermore, in the building damping structure according to the present invention, an additional mass body that constitutes a damper is arranged inside such a hollow beam member.

When the beam member vibrates with the part fixed by the steady rest as a node, the additional mass body of the damper provided on the beam member corresponding to the antinode part of the vibration is a specific part of the vibration of the beam member. It vibrates in the opposite phase to the vibration. The vibration of the beam member is further suppressed by the antiphase vibration of the additional mass body, thereby suppressing the vibration of the panel member supported by the beam member.

Further, as described above, by arranging the additional mass body of the damper inside the beam member, it is possible to balance the weight without greatly deviating the weight toward one or the other side in the width direction of the flange. In addition, since at least a part of the damper is disposed inside the beam member, the protruding dimension of the damper attached to the beam member from the beam member is reduced, or the damper is completely accommodated in the beam member.

In the present invention, the inner side of the beam member means the inner side of the cross section of the beam member, and all of the additional mass bodies constituting the damper may be arranged inside the cross section of the beam member. A part of the mass body may protrude from the beam member.

And the bracket which comprises a damper is attached because a fixing | fixed part is fixed to a web inside a beam member. For this reason, for example, when a pair of beam members opened on one side along the width direction of the flange are used in an integrally connected state with the back facing, for example, the web and fixing of one beam member are used. The fixing member that fixes the fixing portion and the web through the portion can further fix the pair of beam members by passing through the web of the other beam member.

According to a third aspect of the present invention, in the building damping structure according to the second aspect of the present invention, the pair of flanges are connected on the opposite side of the web along the width direction of the pair of flanges. The connecting part is provided.
  In the building damping structure according to the third aspect of the present invention, the beam member opens on one side in the width direction of the flange, but the connecting portion connects the upper and lower flanges on the side opposite to the web. Yes. Thereby, the deformation | transformation which a flange contacts / separates mutually is prevented. For this reason, torsion or the like of the beam member due to such deformation of the flange is suppressed or prevented, and occurrence of vibration or the like due to torsion or the like of the beam member can be effectively suppressed or prevented.

According to a fourth aspect of the present invention, there is provided the vibration damping structure for a building according to the second or third aspect, wherein the bracket is integrally formed with the connecting portion, and the connecting portion is The bracket is attached to the beam member by connecting a pair of flanges.
  According to the building damping structure according to the fourth aspect of the present invention, the connecting portion is integrally formed on the bracket constituting the damper, and the upper and lower flanges of the beam member are connected by the connecting portion. A bracket is attached to the beam member. For this reason, the operation | work for connecting the upper and lower flanges by a connection part and the operation | work for attaching a bracket to a beam member can be performed by 1 process.

As described above, in the building damping structure according to the first aspect of the present invention, the amplitude of the vibration of the beam member and the panel member can be reduced, thereby reducing the vibration of the panel member supported by the beam member. It can be effectively suppressed. In addition, since it is possible to prevent the upper and lower flanges constituting the beam member from being deformed so as to come into contact with or separate from each other, even if the weight of the additional mass body of the damper acts on the flange, the flange does not deform. As a result, the torsion of the beam member due to the deformation of the flange can be suppressed or prevented, and the occurrence of vibration or the like due to the torsion of the beam member can be effectively suppressed or prevented. Improvements can be made.

  Furthermore, since the additional mass body of the damper is arranged inside the beam member, the weight of the beam member can be balanced, and the protruding dimension of the damper from the beam member can be reduced or the damper can be completely accommodated in the beam member. . In addition, since the operation for connecting the upper and lower flanges by the connecting portion and the operation for attaching the bracket to the beam member can be performed in one step, the work efficiency can be improved.

In the building damping structure according to the second aspect of the present invention, the amplitude of the vibration of the beam member and the panel member can be reduced, and thereby the vibration of the panel member supported by the beam member can be effectively suppressed. Furthermore, since the additional mass body of the damper is arranged inside the beam member, the weight of the beam member can be balanced, and the protruding dimension of the damper from the beam member can be reduced or the damper can be completely accommodated in the beam member. .

In the building damping structure according to the third aspect of the present invention, since the upper and lower flanges constituting the beam member can be prevented from being deformed so as to come into contact with each other, the weight of the additional mass body of the damper is the flange Even if it acts on the flange, the flange will not be deformed. As a result, the torsion of the beam member due to the deformation of the flange can be suppressed or prevented, and the occurrence of vibration or the like due to the torsion of the beam member can be effectively suppressed or prevented. Improvements can be made.

In the building damping structure according to the fourth aspect of the present invention, the operation for connecting the upper and lower flanges by the connecting portion and the operation for attaching the bracket to the beam member can be performed in one step. , Work efficiency can be improved.

<Configuration of First Embodiment>
FIG. 1 is a front view schematically showing a configuration of a floor structure 10 of a house (particularly, a steel house in the present embodiment) to which the building damping structure according to the first embodiment of the present invention is applied. FIG. 2 shows a schematic side view of the structure of the floor structure 10.

  As shown in these drawings, the floor structure 10 includes a floor surface material 12 as a panel member. The floor material 12 is formed in a flat plate shape, and is arranged horizontally with the thickness direction along the vertical direction. A floor joist 14 as a beam member is disposed below the floor surface material 12 (one side in the thickness direction).

  As shown in FIG. 3, the floor joist 14 includes a web 16. The web 16 has a longitudinal direction along one horizontal direction and a flat plate shape in the width direction along the vertical direction. A flange 18 is formed at one end (upper end) in the width direction of the web 16.

  Each flange 18 includes a lateral plate portion 20. The horizontal plate portion 20 is formed in the width direction along the horizontal direction, and one end in the width direction is connected to one end (upper end) of the web 16 in the width direction. A vertical plate 22 is formed at the other end in the width direction of the horizontal plate 20 (the end opposite to the web 16). The vertical plate portion 22 is formed in a flat plate shape parallel to the web 16 and extends from the horizontal plate portion 20 toward the other end side in the width direction of the web 16.

On the other hand, a flange 24 is formed at the other end (lower end) in the width direction of the web 16. Each flange 24 includes a lateral plate portion 26. The horizontal plate portion 26 is formed in the width direction along the horizontal direction, and one end in the width direction is connected to the other end (lower end) in the width direction of the web 16. The extending direction of the horizontal plate portion 26 from the web 16 is the same as the extending direction of the horizontal plate portion 20 from the web 16, and the horizontal plate portion 26 extends along the width direction of the web 16. Is facing.

A vertical plate portion 28 is formed at the other end in the width direction of the horizontal plate portion 26 (the end portion opposite to the web 16). The vertical plate portion 28 is formed in a flat plate shape parallel to the web 16, and extends from the horizontal plate portion 20 toward one end side in the width direction of the web 16. That is, the flange 24 has a line-symmetric structure with the web 16 as the boundary in the width direction, and the section obtained by cutting the floor joist 14 along the direction orthogonal to the longitudinal direction is substantially “C”. The floor joist 14 is formed of a so-called “lip type steel”.

  As shown in FIG. 2, the floor joists 14 having the above configuration are arranged in parallel with each other at predetermined intervals along the width direction of the horizontal plate portion 20, and each of the floor joists 14 below the floor material 12. Support from the side. Further, as shown in FIG. 1, support walls 30 are provided on both ends in the longitudinal direction of the floor joists 14. The support wall 30 is in contact with the horizontal plate portion 26 from below, and the horizontal plate portion 26, that is, the floor joist 14, is fixed by fastening means such as bolts and screws, or fixing means such as welding or adhesive.

  Further, an anti-sway member 32 is provided at the center of the floor joist 14 in the longitudinal direction. The steady rest 32 is in the shape of a rectangular bar that is long along the horizontal direction intersecting (orthogonal in the present embodiment) with respect to the longitudinal direction of the floor joists 14. The steady rest member 32 is in contact with the horizontal plate portion 26 from below the floor joist 14, and the horizontal plate portion 26, that is, the floor joist 14 is fixed by fastening means such as bolts and screws or fixing means such as welding or adhesive. Has been.

  A dynamic damper 40 as a damper is provided between the support wall 30 and the steady rest 32. As shown in FIGS. 3 and 4, the dynamic damper 40 includes a bracket 42. As shown in FIG. 4, the bracket 42 includes a base 44.

  The base 44 is parallel to the floor surface material 12 when the dynamic damper 40 is mounted on the floor joist 14, and in this embodiment, the width direction is a flat plate shape along the width direction of the horizontal plate portion 20 and the horizontal plate portion 26. It is said that. A substantially rectangular notch 46 is formed in the base 44. The notch 46 is formed at a substantially central portion in the longitudinal direction at one end in the width direction of the base 44 (in the state where the dynamic damper 40 is mounted on the floor joist 14, the side of the vertical plate 28 along the width of the horizontal plate 26). ing.

  A fixing piece 48 extends from the bottom of the notch 46 toward one side (downward) in the thickness direction of the base 44. The fixed piece 48 has an outer peripheral shape substantially equal to the shape of the notch 46, and the fixed piece 48 is formed by bending the remaining part of the base 44 in forming the notch 46 downward. A screw hole 52 through which the screw 50 shown in FIG. 3 passes is formed substantially at the center of the fixed piece 48. When the dynamic damper 40 is mounted on the floor joist 14, the fixing piece 48 overlaps the vertical plate portion 28 along the width direction of the base 44 or the horizontal plate portion 26, and the screw 50 penetrating the screw hole 52 attaches the fixing piece 48. It fixes to the horizontal board part 26. FIG.

  On the other hand, from the other end in the width direction of the base 44, a pair of fixing pieces 54 each serving as a fixing portion extend toward the other (upward) in the thickness direction of the base 44. A screw hole 58 through which the screw 56 shown in FIG. 3 passes is formed at a substantially center in the width direction on the front end side of the fixed piece 54. When the dynamic damper 40 is mounted on the floor joist 14, the fixing piece 54 overlaps the web 16 in the thickness direction of the fixing piece 54 and the web 16, and the screw 56 passing through the screw hole 58 fixes the fixing piece 54 to the web 16. To do.

  Further, on both sides in the width direction of the fixed piece 54, the base portion 66 extends from the other end of the base 44 in a direction opposite to the extending direction of the fixed piece 54, that is, downward. The extension dimension of the abutting piece 60 from the base 44, that is, the length from one surface (lower surface) of the base 44 in the thickness direction along the thickness direction of the base 44 to the tip of the fixed piece 54 is a horizontal plate. The length from the surface of the horizontal plate portion 26 facing the horizontal plate portion 20 to the tip of the vertical plate portion 28 along the thickness direction of the portion 26 is substantially equal to the length of the vertical plate portion 28. In the contacted state, the tip of the abutting piece 60 comes into contact with the horizontal plate portion 26.

  Since the tip of the abutting piece 60 abuts against the horizontal plate portion 26, the balance can be maintained in a state where the base 44 is abutted against the tip of the vertical plate portion 28. Is fixed to the vertical plate portion 28 or the fixing piece 54 is fixed to the web 16, the base 44 is not rattled even if the base 44 is not particularly firmly supported, and the workability can be improved.

  On the other hand, connecting pieces 62 extend from both ends in the longitudinal direction on one end side in the width direction of the base 44. An opening stopper 64 as a connecting portion is formed continuously from the end of the connection piece 62 facing the other end in the width direction of the base 44. The opening stopper 64 includes a substantially trapezoidal base 66 whose upper end and lower end are parallel in a front view. A joint 68 is formed continuously from the upper end of the base 66.

  The joint piece 68 is formed in the shape of a narrow plate in the longitudinal direction along the vertical direction when viewed from the front, and a fixed piece 70 bent in a bowl shape with the width direction of the joint piece 68 as the axial direction is continuous at the upper end portion. Is formed. The distal end side of the fixed piece 70 has a flat plate shape parallel to the vertical plate portion 22, and a screw hole 74 through which the screw 72 shown in FIG.

  On the other hand, a fixed piece 76 is continuously formed from the lower end of the base 66. The fixed piece 76 is bent in a bowl shape with the width direction of the joint piece 68 as an axial direction, and the tip end side thereof is a flat plate shape parallel to the vertical plate portion 28. A screw hole 80 through which a screw 78 shown in FIG. 3 passes is formed in a substantially central portion on the distal end side of the fixed piece 76.

  When the dynamic damper 40 is mounted on the floor joist 14, the distal end side of the fixed piece 70 overlaps with the vertical plate portion 22, and the distal end side of the fixed piece 76 overlaps with the vertical plate portion 28. In this state, the screws 72 that pass through the screw holes 74 fix the fixing piece 70 to the vertical plate portion 22, and the screws 78 that pass through the screw holes 80 fix the fixing piece 76 to the vertical plate portion 28. In this state, the opening preventing portion 64 connects the vertical plate portion 22 and the vertical plate portion 28.

  On the other hand, as shown in FIG. 3, a mass base 82 is provided on the base 44. As shown in FIG. 4, the mass base 82 includes a flat mass base body 84. The mass base body 84 has a flat plate shape that is long in the longitudinal direction of the floor joists 14 and parallel to the base 44.

  A pair of rubber blocks 86, each serving as an elastic member, are placed on the mass base body 84 at both ends in the longitudinal direction of the mass base body 84. The rubber block 86 is formed in a block shape that can be elastically deformed in the thickness direction (that is, the vertical direction) of the mass base body 84 by, for example, butyl rubber. The material of the rubber block 86 is not limited to butyl rubber, and may be formed of natural rubber or other synthetic resin material. Further, the material of the elastic member is not limited to such natural rubber or synthetic resin material, and a metal spring or the like is applied as long as it can be elastically deformed in the thickness direction (that is, the vertical direction) of the mass base body 84. May be.

  Furthermore, the elastic member is a beam member (that is, the floor joist 14 in the present embodiment) (length, length from the support wall 30 to the steady rest 32), shape (particularly, cross-sectional shape), What is necessary is just to select suitably the material which has an elastic coefficient according to each parameter which affects the natural frequency of a beam member, such as a material.

  On the pair of rubber blocks 86, a mass block 88 as an additional mass body is placed. The mass block 88 is formed of a metal such as iron in a block shape or a plate shape in which the longitudinal direction and the width direction correspond to the longitudinal direction and the width direction of the web 16, for example. The dimensions and masses of the mass block 88 in the longitudinal direction, the width direction, and the thickness direction are the length of the beam member (that is, the floor joist 14 in the present embodiment). (Length up to 32), shape (particularly, cross-sectional shape), material, etc., are set according to each parameter affecting the natural frequency of the beam member (that is, floor joist 14 in this embodiment).

  In the present embodiment, the material of the mass block 88 is a metal such as iron, but the material of the mass block 88 is not limited to a metal, and the beam member as described above (that is, the present embodiment). Then, based on each parameter affecting the natural frequency of the floor joist 14), the material of the mass block 88 may be appropriately selected according to the dimensions suitable for the mass block 88 and the required mass.

  As shown in FIG. 3, the extension dimension of the fixed piece 54 from the base 44 is set so that the distal end side of the fixed piece 54 protrudes upward from the upper end portion of the mass block 88. For this reason, even when the mass block 88 is installed, the fixing piece 54 can be fixed to the web 16 with the screw 56.

  Furthermore, as shown in FIG. 4, a loose fitting piece 90 is formed at one end in the thickness direction of the mass block 88. The loose fitting piece 90 has a concave shape opened toward the mass block 88 side, and the inside thereof is a loose fitting hole 92 penetrating in the vertical direction. A restriction piece 94 extends from one end in the width direction of the mass base body 84 toward the other side in the thickness direction of the mass base body 84, that is, upward. The restricting piece 94 passes through the loose fitting hole 92, and the longitudinal direction and width of the mass base main body 84 are allowed in the thickness direction of the mass base main body 84 while allowing the displacement of the loose fitting hole 92 and thus the mass block 88. The displacement of the loose fitting hole 92 in the direction, and thus the mass block 88 is restricted.

  On both sides of the loosely fitting piece 90 along the longitudinal direction of the mass base body 84, a fixing piece 96 extends from one end in the width direction of the mass base body 84. A through hole 98 is formed in the approximate center of the fixed piece 96, and the bolt 100 penetrates from above. A through hole 102 is formed on both sides of the notch 46 along the longitudinal direction of the base 44 corresponding to the fixed piece 96. A weld nut 104 is coaxially fixed to the through hole 102 on one surface (lower surface) in the thickness direction of the base 44. The bolt 100 passing through the through hole 98 passes through the through hole 102 and is screwed into the weld nut 104 as shown in FIG. 3, whereby the mass base body 84 is integrally fixed to the base 44.

<Operation and Effect of First Embodiment>
Next, the operation and effect of the present embodiment will be described. In the present embodiment, an upper forced external force due to a person walking on the floor covering 12 or an object being dropped on the floor covering 12 is transmitted to the floor joist 14 via the floor covering 12. The floor joist 14 tries to vibrate. However, both ends in the longitudinal direction of the floor joists 14 are fixed to the support wall 30, and the center in the longitudinal direction of the floor joists 14 is fixed to the steadying material 32. For this reason, the longitudinal end portions and the longitudinal center portion of the floor joists 14 cannot vibrate, and are forced to be “nodes” of vibration.

  Here, as shown in FIG. 5 and FIG. 6, compared with the structure in which only the both ends in the longitudinal direction of the floor joist 14 are “nodes” of the vibration of the floor joist 14, A structure in which the central part in the direction is a “node” of vibration has a short inter-node distance. Therefore, the vibration “nodes” of the floor joists 14 at both longitudinal ends and the center in the longitudinal direction are larger than the amplitude D1 when only the both ends in the longitudinal direction of the floor joists 14 are used as vibration “nodes”. In this case, the amplitude D2 becomes smaller.

  Further, as shown in FIG. 1, a dynamic damper 40 is provided in the central portion between the support wall 30 and the steady rest 32, that is, in the present embodiment, the “belly” portion of the vibration of the floor joist 14. It is done. Therefore, when the floor joist 14 vibrates, the vibration of the floor joist 14 having a frequency corresponding to an eigenvalue based on the spring constant of the rubber block 86 and the mass of the mass block 88 is attenuated. Thus, the vibration amplitude D3 shown in FIG. 1 becomes smaller than the vibration amplitude D2 in the structure without the dynamic damper 40 shown in FIG.

  Thus, in the present floor structure 10, the vibration of the floor joist 14 can be suppressed by effectively reducing the amplitude of the vibration of the floor joist 14, and the generation of sound due to the vibration of the floor material 12 can be reduced.

  In addition, as described above, the vibration generated in the floor joist 14 is stabilized by forcibly creating a vibration “node” between the support wall 30 and the steady rest 32. For this reason, the eigenvalue based on the spring constant (elastic coefficient) of the rubber block 86 of the dynamic damper 40 and the mass of the mass block 88 can be set accurately, and the vibration of the floor joist 14 can be matched with this eigenvalue. Thereby, the vibration suppression effect by the dynamic damper 40 can be made high easily.

  On the other hand, in a state where the dynamic damper 40 including the mass block 88 is mounted on the floor joist 14, the upper forced external force as described above tries to swing the mass block 88 about an axis whose axial direction is the longitudinal direction of the floor joist 14. Then, the floor joist 14 sways around the axis with the longitudinal direction of the floor joist 14 as the axial direction around the fixed portion of the screw 56 together with the dynamic damper 40 below the fixed portion with the screw 56. Try to. Such shaking is also a deformation of the floor joists 14 such that the vertical plate portion 22 and the vertical plate portion 28 come into contact with and away from each other.

  Here, in the present embodiment, the opening preventing portion 64 integrally connects the vertical plate portion 22 and the vertical plate portion 28. For this reason, the vertical plate portion 22 and the vertical plate portion 28 do not contact or separate. Thereby, the shaking as described above is prevented or effectively suppressed, and as a result, the vibration (lateral vibration) of the floor joists 14 in the width direction of the horizontal plate portion 20 and the horizontal plate portion 26 can be extremely effectively suppressed. Moreover, since the vertical plate portion 28 can be prevented from being deformed so as to be separated from the vertical plate portion 22 due to the weight of the dynamic damper 40 including the mass block 88, the vertical plate portion 28 is inclined and the mass block 88 is a rubber block. It is possible to prevent separation from falling off 86.

  Further, in the present embodiment, in order to support the floor surface material 12 from below, a lip type steel having a substantially “C” cross section is applied as the floor joist 14. For this reason, the dynamic damper 40 can be disposed inside the floor joist 14. Accordingly, the mass block 88 can be balanced with respect to the floor joist 14 without biasing the mass block 88 to one side or the other side in the width direction of the floor joist 14. The vibration (lateral vibration) of the floor joists 14 in the width direction of the horizontal plate portion 20 and the horizontal plate portion 26 due to the bias to one side or the other side of the width direction can be extremely effectively suppressed.

  Furthermore, by disposing the dynamic damper 40 inside the floor joist 14, even when the dynamic damper 40 is attached to the floor joist 14, the projecting dimension of the dynamic damper 40 outward in the width direction of the floor joist 14 is extremely small. For this reason, even when the dynamic damper 40 is attached to the floor joists 14, when the plurality of floor joists 14 are arranged and conveyed, the interval between the plurality of arranged floor joists 14 can be reduced, and the conveyance efficiency is good.

  Further, as shown in FIG. 7, the floor joists 14 may be used in a state where the webs 16 of both floor joists 14 are fixed with screws or the like. Here, the dynamic damper 40 of the main floor structure 10 has a structure in which the fixing piece 54 is fixed to the web 16 with the screw 56. For this reason, the web 16 of the other floor joist 14 can be fixed to the web 16 of the one floor joist 14 with the screw 56 penetrating the web 16 of the one floor joist 14.

  That is, in the case where the floor joists 14 are back-to-back and the webs 16 of both floor joists 14 are fixed with screws or the like, a screwing process for fixing the dynamic damper 40 to the web 16 and one floor joist The screw fixing process for fixing the web 16 of the other floor joist 14 to the 14 web 16 can be completed in one process, and the number of work steps can be reduced.

  Further, when the dynamic damper 40 is mounted on the floor joist 14 in advance at the factory, the web 16 of the floor joist 14 and the dynamic damper 40 that are not mounted with the dynamic damper 40 are mounted on the construction site of the house. When the web 16 of the floor joist 14 is brought into contact with the web 16 of the floor joist 14 to which the dynamic damper 40 is attached, the screw 56 protruding from the web 16 of the floor joist 14 to which the dynamic damper 40 is attached. Will interfere.

  However, in this embodiment, not only the fixing piece 54 is fixed to the web 16 with the screw 56 but also the fixing piece 70 is fixed to the vertical plate portion 22 with the screw 72, and the fixing piece 76 is fixed with the screw 78 to the vertical plate portion 28. The dynamic damper 40 is attached to the floor joist 14 by fixing to the floor joist.

  For this reason, for example, when the dynamic damper 40 is mounted on the floor joist 14 in advance at a factory, the fixing pieces 54 are not fixed to the web 16 with the screws 56, but the fixing pieces 70 and 76 are fixed with the screws 72 and 78. By fixing to the vertical plate portions 22 and 28, the fixed piece 54 penetrating the web 16 does not interfere, and the web 16 of the floor joist 14 on which the dynamic damper 40 is not mounted at the construction site of the house, The web 16 of the floor joist 14 to which the dynamic damper 40 is mounted can be brought into contact. In this state, if the fixing piece 54 is fixed to the web 16 with the screw 56, the dynamic damper 40 is mounted as described above. The floor joist 14 and the floor joist 14 to which the dynamic damper 40 is not attached can be combined.

  In the present embodiment, as shown in FIG. 1, the “center” of the vibration is formed by fixing the approximate center of the floor joist 14 with the steadying material 32, but the installation position of the steadying material 32 is the floor. For example, as shown in FIG. 8, the anti-sway members 32 are respectively provided at approximately one third of the total length of the floor joists 14 from both ends in the longitudinal direction of the floor joists 14 as shown in FIG. 8. A plurality of anti-sway members 32 may be appropriately disposed according to the vibration mode to be suppressed, such as by providing.

  Further, in the present embodiment, the arrangement position of the dynamic damper 40 is set to the approximate center between the support wall 30 and the steady rest 32, but this is the approximate center between the support wall 30 and the steady rest 32. Is assumed to be the position of the “belly” of the vibration of the floor joist 14, and the arrangement position of the dynamic damper 40 is not limited to the approximate center between the support wall 30 and the steady rest 32, and dynamic The arrangement position of the damper 40 may be set to the position of the “belly” of the vibration of the floor joist 14.

<Second Embodiment>
Next, a second embodiment of the present invention will be described. In the description of the present embodiment, the same reference numerals are given to the same parts as those in the first embodiment, and the detailed description thereof is omitted.

  FIG. 9 is a front view schematically showing a configuration of a residential floor structure 140 to which the building damping structure according to the present embodiment is applied. As shown in this figure, in the floor structure 140, a plurality of floor joists 14 are arranged below the floor surface material 12. These floor joists 14 are arranged in parallel in a horizontal direction orthogonal to the longitudinal direction of the floor joists 14 at predetermined intervals, and are fixed to the floor joists 14 by fastening means such as bolts and screws (not shown).

  Further, in the present floor structure 140, the dynamic damper 40 is not provided in the floor joists 14, and instead, a dynamic damper 142 as a damper is disposed at a substantially center between the floor joists 14 adjacent to each other. The dynamic damper 142 includes a holding body 144 to which a bracket 42 (for details, see FIG. 3 for the same configuration) is attached. The holding body 144 has basically the same structure as the floor joists 14, but the longitudinal dimension is sufficiently shorter than the floor joists 14, and both ends and the center thereof are not fixed to the support wall 30 or the anti-sway member 32. . In the dynamic damper 142, the horizontal plate portion 20 constituting the holding body 144 is fixed to the lower surface (back surface) of 012 by fastening means such as bolts and screws (not shown).

  In the present embodiment configured as described above, when the floor surface material 12 vibrates due to the upper forced external force, the floor joists 14 perform the same functions as the support wall 30 and the steady rest material 32 in the first embodiment. A “node” of vibration of the face material 12 is formed (that is, in the present embodiment, the floor joist 14 constitutes the steadying material in the present invention).

  Furthermore, the dynamic damper 142 provided between the floor joists 14 adjacent to each other exhibits the same action as the dynamic damper 40 in the first embodiment. Thereby, the amplitude of the vibration of the floor material 12 can be effectively reduced, and the vibration can be effectively suppressed.

  In each of the above embodiments, the present invention is applied to the floor structure 10 and the floor structure 140. However, for example, the present invention may be applied to the ceiling of a building such as a house to suppress the vibration of the ceiling. .

  In each of the above embodiments, the floor joist 14 having a “C” cross section is applied as the beam member. However, the beam member may have any shape, for example, a beam. The member may have a rectangular bar shape with a rectangular cross section.

It is a front view which shows the outline of the floor structure to which the damping structure for buildings concerning the 1st Embodiment of this invention is applied, and the state of a vibration. It is a side view which shows the outline of the floor structure to which the damping structure for buildings concerning the 1st Embodiment of this invention is applied. It is a perspective view which shows the structure of the damper of the vibration damping structure for buildings concerning the 1st Embodiment of this invention. It is a disassembled perspective view of a damper. It is a figure corresponding to FIG. 1 which shows the structure and state of a vibration in the case where the steady rest material and the damper are not provided. It is a figure corresponding to FIG. 1 which shows the structure in the case where the steady rest material is not provided, and the state of a vibration. It is a figure which shows the example of the structure which used the beam member for back-to-back. It is a figure which shows the modification which increased the number of beam members and dampers. It is a front view which shows the outline of the floor structure to which the vibration damping structure for buildings concerning the 2nd Embodiment of this invention is applied.

Explanation of symbols

12 Floor material (panel material)
14 Floor joist (beam member, steady rest material in the second embodiment)
16 Web 18 Flange 24 Flange 32 Stabilizer 40 Dynamic damper (damper)
42 Bracket 44 Base 54 Fixed piece 64 Opening stop (connecting part)
88 Mass Block (Additional Mass)
142 Dynamic damper (damper)

Claims (4)

A pair of flanges facing each other in the vertical direction are connected by a web to form a hollow shape with one side in the width direction of the flange portion opened, and the side opposite to the web along the width direction of the pair of flanges The pair of flanges are connected to each other by a connecting portion provided on the beam member to hold the intermediate portion in the longitudinal direction of the beam member that supports the panel member to fix the beam member, and the portion holding the beam member is connected to the panel member and An anti-slip material that is a node of vibration generated in the beam member ;
The connecting portion is formed integrally, and the connecting portion has a bracket attached to the beam member by connecting the pair of flanges, and is provided on the beam member corresponding to the antinode portion of the vibration. A damper that suppresses vibration generated in the beam member by vibrating in an opposite phase to a specific vibration among vibrations generated in the beam member;
Vibration control structure for buildings. A pair of flanges facing each other in the vertical direction are connected by a web to form a hollow shape with one side in the width direction of the flange portion opened, and the side opposite to the web along the width direction of the pair of flanges The pair of flanges are connected to each other by a connecting portion provided on the beam member to hold the intermediate portion in the longitudinal direction of the beam member that supports the panel member to fix the beam member, and the portion holding the beam member is connected to the panel member and An anti-slip material that is a node of vibration generated in the beam member;
A fixing portion that is fixed to the web from the inside of the beam member is integrally formed, and has a bracket that is attached to the beam member by fixing the fixing portion to the web. A damper that suppresses the vibration generated in the beam member by virtue of the additional mass provided in the beam member corresponding to the vibration of the beam member having a phase opposite to a specific vibration among the vibrations generated in the beam member; ,
Buildings damping structure Ru comprising a. The building vibration control structure according to claim 2 , further comprising a connecting portion that connects the pair of flanges on a side opposite to the web along a width direction of the pair of flanges . 4. The vibration damping for a building according to claim 2, wherein the bracket is formed integrally with the connecting portion, and the bracket is attached to the beam member by connecting the pair of flanges with the connecting portion. 5. Construction.

Images