JP6208782B2 - Dynamic vibration absorber and floor - Google Patents

Description

  The present invention relates to a dynamic vibration absorber and a floor provided with the same.

  2. Description of the Related Art Conventionally, in a building such as a building, a condominium, or a house, it is known to attach a dynamic vibration absorber (dynamic damper) under the floor for the purpose of suppressing vibration generated on the floor. An example of this type of dynamic vibration absorber is described in Patent Document 1 below. The dynamic vibration damping device described in Patent Document 1 includes a vibration damping plate in which a viscoelastic member is sandwiched between a pair of plate-like elastic members, and an attachment member for attaching the vibration damping plate to the floor below. Yes. The mounting member is suspended from under the floor and penetrates the vibration damping plate in the thickness direction, and a nut is attached to the penetrating end. The damping plate is constrained in the thickness direction by being sandwiched in the thickness direction between the downward surface of the mounting member and the upper surface of the nut.

  In the above-described dynamic vibration absorber, vibration generated on the floor is transmitted to the vibration damping plate via the mounting member. The mass portion of the damping plate (the portion around the fixed portion with respect to the mounting member) vibrates in an opposite phase to the flooring, and vibration energy is absorbed by the shear stress of the viscoelastic member. Thereby, floor vibration is reduced.

JP-A-5-26294

  In the dynamic vibration damping device described in Patent Document 1, the vibration damping plate is sandwiched in the thickness direction. For this reason, when a viscoelastic member that is prone to creep is used, the viscoelastic member is plastically deformed by being compressed in the thickness direction, while the distance between the two surfaces sandwiching the damping plate is maintained. The As a result, a gap is generated between the pair of plate-like elastic members. As a result, the restraining force of the damping plate becomes insufficient, the resonance frequency is lowered, and the reaction force of the dynamic vibration damping device becomes difficult to be transmitted to the floor, resulting in a problem that the damping performance is lowered.

  The present invention has been made in view of the above problems, and the purpose thereof is to suppress a decrease in damping performance against floor vibration even when a viscoelastic member that easily generates creep is used. A dynamic vibration absorber and a floor provided with the same are provided.

A dynamic vibration absorber according to one aspect of the present invention is a dynamic vibration absorber for suppressing vibration generated in a flooring material. This dynamic vibration absorber has a rectangular shape, a fulcrum region provided along the longitudinal direction of the rectangular shape, a deformable portion that can be elastically deformed in the thickness direction with the fulcrum region as a fulcrum, and a vibration damping device having the same A fixing mechanism having a plate, a portion fixed to the floor material, and a portion fixed to the fulcrum region; The damping plate includes a metal plate including a first surface facing one side in the thickness direction and a second surface facing the other side in the thickness direction, and the first surface so as to expose a part of the first surface. A viscoelastic member disposed on one surface. The fixing mechanism restrains the metal plate in the thickness direction in contact with the exposed portion of the first surface and the second surface. The fixing mechanism includes a first restraining member and a second restraining member that extend in the longitudinal direction and restrict deformation in the thickness direction of the fulcrum region by sandwiching the fulcrum region of the damping plate in the thickness direction.

In the dynamic vibration absorber, vibration generated in the floor material is transmitted to the vibration damping plate via the fixing mechanism. As a result, the vibration is reduced by the deformed portion of the damping plate having a phase different from that of the floor material, and the vibration is attenuated by the shear stress generated in the viscoelastic member. In this way, the vibration generated in the flooring can be reduced by the dynamic vibration absorber. Moreover, according to the said structure, the deformation | transformation of the thickness direction of a damping board can be controlled along a longitudinal direction, and the edge part of a transversal direction can be functioned as a deformation | transformation part. At this time, the length of the deformed portion in the short direction can be designed to be substantially constant in the long direction. For this reason, the vibration cycle of the damping plate can be easily adjusted according to the cycle of the floor vibration to be damped.

  Moreover, in the said dynamic vibration damping device, the said metal plate is restrained in the thickness direction in the state which the fixing mechanism contacted the 1st surface and 2nd surface of the metal plate. For this reason, even when creep occurs in the viscoelastic member, it is possible to reliably restrain the vibration damping plate in the thickness direction and to prevent the fixed torque from coming off. As a result, the vibration generated in the flooring can be sufficiently transmitted to the dynamic vibration absorber, and a reduction in vibration damping performance can be suppressed.

  In the dynamic vibration absorber, the fixing mechanism may include a first suspension bolt and a second suspension bolt. The first suspension bolt may include one end fixed to the first fixing part of the flooring and the other end fixed to the first support part of the fulcrum region. The second suspension bolt includes one end fixed to the second fixing part of the flooring and the other end fixed to the second supporting part that is separated from the first supporting part in the fulcrum region. May be.

  According to the said structure, a damping board and a flooring can be fixed in two site | parts mutually separated using the 1st and 2nd suspension bolt. That is, the damping plate and the flooring can be fixed at two points. Thereby, unlike the case where one point is fixed, it is possible to prevent the damping plate from rotating with respect to the flooring.

In the dynamic vibration absorber, before Symbol fulcrum region, said first and second support portions may be free Ndei.

  In the dynamic vibration absorber, a hole for forming the exposed portion of the first surface may be formed in the viscoelastic member. The fixing mechanism may include a spacer that is disposed in the hole and includes a first spacer surface that contacts the first surface and a second spacer surface that contacts the first restraining member. The metal plate may be restrained in the thickness direction in a state where the first spacer surface is in contact with the exposed portion of the first surface and the second restraining member is in contact with the second surface.

  According to the said structure, a contact with the 1st surface of a metal plate can be easily ensured by arrange | positioning a spacer in the hole formed in the viscoelastic member. And a metal plate can be pinched | interposed by a spacer and a 2nd restraint member, and the said metal plate can be restrained in the thickness direction.

  In the dynamic vibration absorber, the fixing mechanism includes a first member having a surface that contacts the exposed portion of the first surface, a second member having a surface that contacts the second surface, the first member, and the And a tightening mechanism for applying a tightening force for tightening the second member in the thickness direction.

  According to the said structure, a metal plate can be restrained more reliably by giving clamping force to the 1st and 2nd member.

  The floor which concerns on the other situation of this invention is equipped with the flooring and the said dynamic vibration damping device arrange | positioned at the said flooring.

  According to the floor, vibration generated in the floor material can be sufficiently transmitted to the dynamic vibration absorber, and the floor vibration can be effectively suppressed.

  The floor according to yet another aspect of the present invention, a plurality of flooring arranged so as to be adjacent to each other in the same plane, and the above-mentioned dynamic vibration absorber arranged so as to straddle between the adjacent flooring, It has.

  According to the above floor, since the dynamic vibration absorber is arranged so as to straddle between adjacent floor materials, not only vibration generated in individual floor materials but also relative vibration between adjacent floor materials is reduced. can do.

  The floor which concerns on the further another situation of this invention is equipped with the flooring and the said dynamic vibration damping device arrange | positioned at the said flooring. In this floor, a tightening force for tightening the first member and the second member in the thickness direction is transmitted through the floor material.

  According to the floor, the floor material and the dynamic vibration absorber can be fixed by using a tightening force for fastening the first member and the second member.

  According to the present invention, it is possible to provide a dynamic vibration absorber capable of suppressing a decrease in vibration damping performance against floor vibration even when using a viscoelastic member that is prone to creep, and a floor including the same. Can do.

It is a perspective view which shows the structure of the floor concerning embodiment of this invention. It is sectional drawing of the floor along line segment II-II in FIG. It is sectional drawing of the floor along line segment III-III in FIG. It is a perspective view which shows the structure of the dynamic vibration damper which concerns on embodiment of this invention. It is a disassembled perspective view of the said dynamic vibration absorber. It is a disassembled perspective view of the damping plate which comprises the said dynamic vibration absorber. It is a perspective view which shows the structure of the dynamic vibration damper which concerns on another embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[Floor structure]
First, the structure of the floor 10 according to the embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of the floor 10 as viewed from the side opposite to the living space. FIG. 2 shows a cross-sectional structure of the floor 10 taken along a line segment II-II in FIG. FIG. 3 shows a cross-sectional structure of the floor 10 taken along line III-III in FIG.

  The floor 10 is applied to various buildings such as buildings, condominiums, or ordinary houses. The floor 10 mainly has a plurality of flooring materials 2 and a plurality of dynamic vibration absorbers (dynamic dampers) 1 attached to the flooring material 2.

  The flooring 2 is a plate-like member extending in a specific direction (FIG. 1). This specific direction is defined as “longitudinal direction”. The flooring 2 includes a floor upper surface 2A facing the living space, a floor lower surface 2B opposite to the floor upper surface 2A in the thickness direction, four floor side surfaces 2C connecting the floor upper surface 2A and the floor lower surface 2B, have. The flooring materials 2 are arranged so as to be adjacent to each other in the same plane so that their longitudinal directions are parallel to each other and floor side surfaces 2C extending in the longitudinal direction are in contact with each other.

  The dynamic vibration absorber 1 is for suppressing vibration generated in the flooring 2. As shown in FIG. 1, the dynamic vibration absorber 1 is fixed to the floor lower surface 2 </ b> B and arranged along a direction orthogonal to the longitudinal direction of the flooring 2. The dynamic vibration absorbers 1 are arranged in a plurality (two) of rows according to the beam span length in the longitudinal direction. Each dynamic vibration absorber 1 is fixed to each of the two adjacent flooring materials 2 and is disposed so as to straddle between the adjacent flooring materials 2 (FIGS. 1 and 3). That is, the dynamic vibration absorber 1 has a portion fixed to each of the two adjacent flooring materials 2 and is provided so as to extend from one flooring material 2 to the other flooring material 2 along the floor lower surface 2B. It has been. Thereby, the dynamic vibration damping device 1 is opposed to the floor lower surface 2B of each of the two adjacent floor materials 2.

[Structure of dynamic vibration absorber]
Next, the detailed structure of the dynamic vibration damping device 1 will be described with reference mainly to FIGS. FIG. 4 shows the entire structure of the dynamic vibration damping device 1 in a state where it is removed from the floor material 2. FIG. 5 is an exploded perspective view of the dynamic vibration damping device 1. FIG. 6 is an exploded perspective view of the vibration damping plate 20 that exhibits a vibration damping function in the dynamic vibration damping device 1.

  As shown in FIGS. 4 and 5, the dynamic vibration damping device 1 is fixed to the first and second vibration damping plates 20, 21 made of a rectangular plate material, the floor material 2, and the vibration damping plates 20, 21. The fixing mechanism 40 is mainly included. The fixing mechanism 40 includes first and second suspension bolts 41 and 42, restraining members 51 to 53, spacers 61 to 64, and a tightening member 3. As shown in FIG. 3, the fastening member 3 includes a first nut 3A and a first washer 3B disposed on the floor upper surface 2A, and a second nut 3C and a second washer 3D disposed on the dynamic vibration absorber 1 side. And have. The dynamic vibration damping device 1 is a dynamic damper that adopts a double structure using first and second vibration damping plates 20 and 21 in order to improve the vibration damping force. The dynamic vibration damping device 1 is not limited to the double damper structure, and may have only the first vibration damping plate 20 as described later.

  As shown in FIG. 5, the first damping plate 20 includes a first fulcrum region 25 sandwiched between the restraining members 51 and 52 and a first deformable portion that can be elastically deformed in the thickness direction with the first fulcrum region 25 as a fulcrum. 22. The first fulcrum region 25 is provided along the longitudinal direction from one end 23 to the other end 24 in the approximate center of the first damping plate 20. The first deformation portion 22 is provided on both sides of the first fulcrum region 25. The first fulcrum region 25 includes a first support part 25A to which the first suspension bolt 41 is fixed and a second support part 25B to which the second suspension bolt 42 is fixed. The second support portion 25B is provided at a position away from the first support portion 25A in the longitudinal direction.

  The second damping plate 21 includes a second fulcrum region 26 sandwiched between the restraining members 52 and 53 and a second deforming portion 27 that can be elastically deformed in the thickness direction with the second fulcrum region 26 as a fulcrum. . The second fulcrum region 26 is located below the first fulcrum region 25 and is provided along the longitudinal direction at the approximate center of the second damping plate 21. The second deforming portion 27 is provided on both sides of the first fulcrum region 26.

  The second fulcrum region 26 includes a first support part 26A and a second support part 26B. The first support portion 26A is a portion to which the first suspension bolt 41 is fixed, and is located below the first support portion 25A. The second support part 26B is a part to which the second suspension bolt 42 is fixed, and is located below the second support part 25B. The second support portion 26B is provided at a position away from the first support portion 26A in the longitudinal direction.

  As shown in FIG. 6, the first damping plate 20 has a rectangular metal plate 31 and a viscoelastic member that has a rectangular shape that is substantially the same size as the metal plate 31 and is disposed on the metal plate 31. 32. The metal plate 31 is made of a plate spring steel plate and includes a first surface 31A facing one side in the thickness direction and a second surface 31B facing the other side in the thickness direction. A plurality (two) of through holes 31 </ b> C are formed in the metal plate 31 at intervals in the longitudinal direction. These through holes 31C have diameters into which the first and second suspension bolts 41 and 42 can be inserted, and are formed in the first and second support portions 25A and 25B (FIG. 5).

  A preferable material of the viscoelastic member 32 includes, for example, a mixture of a resin having viscoelasticity and a high specific gravity material. Examples of the resin having viscoelasticity include, but are not limited to, resins such as urethane resins, olefin resins, acrylic resins, and silicone resins, petroleum-derived materials such as asphalt, and rubber. Examples of the high specific gravity material include, but are not limited to, metal powder such as iron powder and tungsten powder, slag, and sand.

  As a particularly preferable material, for example, an asphalt vibration damping material in which asphalt and iron powder are mixed can be cited. The viscoelastic member 32 is made of recycled iron powder having a high specific gravity so as to function as a weight of the dynamic vibration absorber 1. The viscoelastic member 32 is disposed on the first surface 31 </ b> A of the metal plate 31, and the thickness thereof is larger than that of the metal plate 31. In the viscoelastic member 32, a plurality (two) of holes 32A penetrating in the thickness direction are formed at intervals in the longitudinal direction. These hole portions 32A are formed at positions that overlap with the through holes 31C of the metal plate 31 in the thickness direction. The diameter of the hole 32A is larger than the diameter of the through hole 31C. For this reason, the exposed portion 33 is formed on the first surface 31A due to the difference in diameter between the through hole 31C and the hole portion 32A. The viscoelastic member 32 is provided on the entire surface other than the exposed portion 33 of the first surface 31A.

  Similar to the first damping plate 20, the second damping plate 21 has a configuration in which a viscoelastic member 72 is disposed on the metal plate 71, and detailed description of the structure is omitted.

  Next, each component constituting the fixing mechanism 40 will be described.

  As shown in FIG. 6, the spacers 61 and 63 have a cylindrical shape having substantially the same diameter as the hole 32 </ b> A and are disposed in the hole 32 </ b> A. The spacers 61 and 63 are made of a metal plate such as iron having a small creep. The thickness of the spacers 61 and 63 may be equal to or greater than the thickness of the viscoelastic member 32. The spacers 61 and 63 include first spacer surfaces 61B and 63B that are one end surfaces in the thickness direction, and second spacer surfaces 61C and 63C that are other end surfaces in the thickness direction. The spacers 61 and 63 are in contact with the exposed portion 33 of the first surface 31A on the first spacer surfaces 61B and 63B in a state where the spacers 61 and 63 are disposed in the hole 32A. At the center of the spacers 61 and 63, through holes 61A and 63A into which the first and second suspension bolts 41 and 42 can be inserted are formed. The spacers 62 and 64 have the same configuration as the spacers 61 and 63, and a description thereof will be omitted.

  As shown in FIG. 5, the restraining members 51 and 52 have a quadrangular prism shape extending in the longitudinal direction, and a hollow portion is formed over the entire longitudinal direction. Like the spacers 61 and 63, the restraining members 51 and 52 are made of a metal plate such as iron having a small creep. The restraining members 51 and 52 have substantially the same length in the longitudinal direction as the first and second damping plates 20 and 21 (first and second fulcrum regions 25 and 26). The restricting members 51 and 52 are formed with insertion holes 51A and 52A into which the first and second suspension bolts 41 and 42 can be inserted.

  The restraining member 51 is disposed in the first fulcrum region 25 on the viscoelastic member 32 side. The restraining member 52 is disposed in the first fulcrum region 25 on the metal plate 31 side, and is disposed in the second fulcrum region 26 on the viscoelastic member 72 side. Thereby, the lower surface of the restraining member 51 is in contact with the second spacer surfaces 61C and 63C, and the lower surface of the restraining member 52 is in contact with the second spacer surfaces 62C and 64C. At this time, the insertion hole 51A of the restraining member 51, the through holes 61A and 63A of the spacers 61 and 63, and the insertion hole 52A of the restraining member 52 are overlapped in the thickness direction.

  As shown in FIG. 5, the restraining member 53 has a shape extending in the longitudinal direction, like the restraining members 51 and 52. Like the spacers 61 and 63 and the restraining members 51 and 52, the restraining member 53 is made of a metal plate such as iron having a small creep. The restraining member 53 includes a first flat plate portion 53A, and second and third flat plate portions 53B and 53C which are erected substantially vertically from both end portions of the first flat plate portion 53A. The first flat plate portion 53A is formed with a plurality (two) of insertion holes 53D into which the first and second suspension bolts 41 and 42 can be inserted.

  The restraining member 53 is disposed in the second fulcrum region 26 on the metal plate 71 side. At this time, the first flat plate portion 53A comes into contact with the second surface of the metal plate 71, and the insertion hole 53D overlaps the insertion hole 52A of the restraining member 52 and the through holes of the spacers 62 and 64 in the thickness direction.

  As shown in FIG. 3, the first suspension bolt 41 includes one end 41 </ b> A fixed to the first fixing part 2 </ b> D in one flooring 2, and the other end 41 </ b> B fixed to the first support parts 25 </ b> A and 26 </ b> A. ,including. The first suspension bolt 41 is inserted through the floor material 2, the restraint member 51, the spacer 61, the metal plate 31, the restraint member 52, the spacer 62, the metal plate 71, and the restraint member 53 in this order. Screw portions are formed at both ends of the first suspension bolt 41, and first nuts 3A and first washers 3B are fastened to end portions protruding upward from the floor upper surface 2A, and from the first flat plate portion 53A. A second nut 3C and a second washer 3D are fastened to the end protruding downward.

  The second suspension bolt 42 includes one end portion 42A fixed to the second fixing portion 2E in the other flooring 2 adjacent to the one flooring 2 to which the first suspension bolt 41 is fixed, the second support portion 25B, 26B and the other end 42B fixed to 26B. The second suspension bolt 42 is inserted through the floor material 2, the restraint member 51, the spacer 63, the metal plate 31, the restraint member 52, the spacer 64, the metal plate 71, and the restraint member 53 in this order. Threaded portions are formed at both ends of the second suspension bolt 42, and first nuts 3A and first washers 3B are fastened to ends projecting upward from the floor top surface 2A, from the first flat plate portion 53A. A second nut 3C and a second washer 3D are fastened to the end protruding downward.

  As shown in FIG. 3, the dynamic vibration damping device 1 includes a restraining member 51, a first damping plate 20, a restraining member 52, a second damping plate 21, and a restraining member 53 that overlap in this order. The first and second suspension bolts 41 and 42 are inserted. The dynamic vibration absorber 1 is fixed in a state where the upper surface of the restraining member 51 is in contact with the floor lower surface 2B.

[Restraining structure of damping plate]
Next, the restraining structure of the first and second damping plates 20 and 21 will be described with reference to FIG.

  In the first damping plate 20, the first spacer surfaces 61B and 63B are in contact with the first surface 31A (exposed portion) of the metal plate 31, and the upper surface of the restraining member 52 is in contact with the second surface 31B. That is, in the first damping plate 20, the spacers 61 and 63 function as “first members” and the restraining member 52 functions as “second member”. The lower surface of the restraining member 51 is in contact with the second spacer surfaces 61C and 63C.

  As shown in FIG. 3, in the second damping plate 21, the first spacer surfaces 62 </ b> B and 64 </ b> B are in contact with the first surface 71 </ b> A (exposed portion) of the metal plate 71 and the second surface 71 </ b> B has the restraining member 53. The upper surface (first flat plate portion 53A) is in contact. That is, in the second damping plate 21, the spacers 62 and 64 function as “first members”, and the restraining member 53 functions as “second member”. Further, the lower surface of the restraining member 52 is in contact with the second spacer surfaces 62C and 64C.

  In the first damping plate 20, the tightening force by the first nut 3A is transmitted in the order of the floor material 2, the restraining member 51, and the spacers 61 and 63, and the tightening force by the second nut 3C is transmitted by the restraining member 53, the metal plate. 71, spacers 62 and 64, and restraint member 52 are transmitted in this order. With this tightening force, the metal plate 31 sandwiched between the spacers 61 and 63 and the restraining member 52 is restrained in the thickness direction. At this time, no force is transmitted to the viscoelastic members 32 that are the portions on both sides in the thickness direction of the spacers 61 and 63 when the dynamic vibration absorber 1 is fixed to the floor. Further, when the restraining members 51 and 52 are arranged so as to sandwich the first fulcrum region 25 of the first damping plate 20 in the thickness direction, the tightening force is applied, whereby the thickness direction of the first fulcrum region 25 is applied. The deformation of is regulated. That is, the restraining member 51 functions as a “first restraining member”, and the restraining member 52 functions as a “second restraining member”.

  In the second damping plate 21, the tightening force by the first nut 3A is transmitted in the order of the flooring 2, the restraining member 51, the spacers 61 and 63, the metal plate 31, the restraining member 52, and the spacers 62 and 64. The tightening force by the nut 3C is transmitted to the restraining member 53 through the second washer 3D. With this tightening force, the metal plate 71 sandwiched between the spacers 62 and 64 and the restraining member 53 is restrained in the thickness direction. At this time, no force is transmitted to the viscoelastic members 72 which are the portions on both sides in the thickness direction of the spacers 62 and 64 when the dynamic vibration absorber 1 is fixed to the floor. Further, the tightening force is applied in a state where the restraining members 52 and 53 are arranged so as to sandwich the second fulcrum region 26 of the second damping plate 21 in the thickness direction, whereby the thickness direction of the second fulcrum region 26 is applied. The deformation of is regulated. That is, the restraining member 52 functions as a “first restraining member”, and the restraining member 53 functions as a “second restraining member”. As described above, the first and second nuts 3A and 3C are tightened to tighten the spacers 61 and 63 and the restraining member 52 in the thickness direction, and tightening the spacers 62 and 64 and the restraining member 53 in the thickness direction. It functions as a “tightening mechanism” for applying force.

[Vibration reduction by dynamic vibration absorber]
Next, a mechanism for reducing the vibration generated in the flooring 2 by the dynamic vibration absorber 1 will be described.

  When vibration is generated in the flooring 2, the vibration is transmitted to the first and second damping plates 20 and 21 via the fixing mechanism 40. Thereby, the 1st and 2nd deformation parts 22 and 27 are elastically deformed in the thickness direction, and vibrate in the opposite phase to the flooring 2. Due to this elastic deformation, shear stress acting in the in-plane direction is generated between the metal plates 31 and 71 in the viscoelastic members 32 and 72, and thereby vibration is attenuated. In this way, the vibration generated in the flooring 2 by the dynamic vibration absorber 1 is reduced.

[Function and effect]
Next, the characteristic structure of the said dynamic vibration damping device 1 and the floor | bed 10, and its effect are demonstrated.

  The dynamic vibration damping device 1 is fixed to the fulcrum regions 25 and 26, the damping plates 20 and 21 having the fulcrum regions 25 and 26, and the deformation portions 22 and 27, the portion fixed to the flooring 2, and the fulcrum regions 25 and 26. And a fixing mechanism 40 having a portion. The damping plates 20 and 21 include metal plates 31 and 71 including the first surfaces 31A and 71A, and viscoelastic members 32 and 72 that expose portions of the first surfaces 31A and 71A. The fixing mechanism 40 restrains the metal plates 31 and 71 in the thickness direction while being in contact with the exposed portions of the first surfaces 31A and 71A and the second surfaces 31B and 71B.

  In the dynamic vibration damping device 1, the fixing mechanism 40 constrains the metal plates 31 and 71 in the thickness direction in a state where the fixing mechanism 40 is in contact with the first surfaces 31A and 71A and the second surfaces 31B and 71B of the metal plates 31 and 71. For this reason, even when creep occurs in the viscoelastic members 32 and 72, the damping plates 20 and 21 can be reliably restrained in the thickness direction, and the fixed torque can be prevented from coming off. As a result, the vibration generated in the flooring 2 can be sufficiently transmitted to the dynamic vibration absorber 1, and the deterioration of the damping performance can be suppressed without the resonance frequency of the damping member being shifted.

  In the dynamic vibration absorber 1, the fixing mechanism 40 includes a first suspension bolt 41 and a second suspension bolt 42. The first suspension bolt 41 includes one end 41A fixed to the first fixing part 2D of the flooring 2 and the other end 41B fixed to the first support parts 25A and 26A of the fulcrum regions 25 and 26. . The second suspension bolt 42 is fixed to one end portion 42A fixed to the second fixing portion 2E of the flooring 2 and to the second supporting portions 25B and 26B separated from the first supporting portions 25A and 26A in the fulcrum regions 25 and 26. The other end portion 42B.

  Thereby, using the 1st and 2nd suspension bolts 41 and 42, the damping plates 20 and 21 and the flooring 2 can be fixed in two parts away from each other. That is, the damping plates 20 and 21 and the flooring 2 can be fixed at two points. Thereby, unlike the case where one point is fixed, it is possible to prevent the damping plates 20 and 21 from rotating with respect to the flooring 2.

In the dynamic vibration damping device 1, the damping plates 20 and 21 have a rectangular shape. The fulcrum regions 25 and 26 include first support portions 25A and 26A and second support portions 25B and 26B, and are provided along the longitudinal direction of the rectangular shape. The fixing mechanism 40 has constraining members 51 to 53 extending in the longitudinal direction. Since the restraining members 51 and 52 are disposed with the first fulcrum region 25 of the first damping plate 20 sandwiched in the thickness direction, deformation of the first fulcrum region 25 in the thickness direction is restricted. Since the restraining members 52 and 53 are arranged with the second fulcrum region 26 of the second damping plate 21 sandwiched in the thickness direction, deformation of the second fulcrum region 26 in the thickness direction is restricted. The deformation of the damping plates 20 and 21 in the thickness direction can be restricted along the longitudinal direction, and the end portions in the short direction can function as the deformation portions 22 and 27. At this time, the length of the deformable portions 22 and 27 in the short direction can be designed to be substantially constant in the long direction. For this reason, the vibration period of the damping plates 20 and 21 can be easily adjusted according to the period of the floor vibration to be damped. In addition, when a plurality of damping plates 20 and 21 are provided, the lengths of the deforming portions 22 and 27 in the short direction can be made different so that the effect can be obtained by adjusting to a plurality of frequencies. .

  In the dynamic vibration absorber 1, the viscoelastic members 32 and 72 are formed with holes 32 </ b> A for forming the exposed portions 33 of the first surfaces 31 </ b> A and 71 </ b> A. The fixing mechanism 40 is disposed in the hole 32A, and the first spacer surfaces 61B, 62B, 63B, and 64B that contact the first surfaces 31A and 71A, and the second spacer surfaces 61C and 62C that contact the restraining members 51 and 52, respectively. , 63C, 64C, and spacers 61-64. The metal plate 31 is constrained in the thickness direction in a state where the first spacer surfaces 61B and 63B are in contact with the exposed portion 33 of the first surface 31A and the constraining member 52 is in contact with the second surface 31B. The metal plate 71 is constrained in the thickness direction in a state where the first spacer surfaces of the spacers 62 and 64 are in contact with the exposed portion of the first surface 71A and the constraining member 53 is in contact with the second surface 71B.

  According to the above configuration, by arranging the spacers 61 to 64 in the holes formed in the viscoelastic members 32 and 72, it is possible to easily ensure contact with the first surfaces 31A and 71A of the metal plates 31 and 71. Can do. And the metal plates 31 and 71 can be pinched | interposed by the spacers 61-64 and the restraining members 52 and 53, and the said metal plates 31 and 71 can be restrained in the thickness direction.

  On the other hand, when the viscoelastic members 32 and 72 are divided into two and the restraining members 51 and 52 are brought into direct contact with the metal plates 31 and 71, the spacers 61 to 64 are omitted. In this case, the rigidity at the divided portion is the weakest among the damping plates 20 and 21, and the shearing force does not work effectively in the viscoelastic members 32 and 72.

  On the other hand, when the viscoelastic members 32 and 72 are brought into contact with the entire surfaces of the first surfaces 31A and 71A of the metal plates 31 and 71 (the hole portion 32A is omitted) and the restraining members 51 and 52 are disposed thereon, the same applies. The spacers 61 to 64 are omitted. In this case, the fixing between the restraining members 51 and 52 and the damping plates 20 and 21 is weakened by creep, and the reaction force of the dynamic vibration absorber 1 is not easily transmitted to the floor. In addition, since the fixing between the restraining members 51 and 52 and the damping plates 20 and 21 is weakened by creep, the resonance frequency of the dynamic vibration damping device 1 is lowered, and it does not work effectively as a damper. In this embodiment, the above problems can be solved by providing the spacers 61 to 64 to ensure contact with the metal plates 31 and 71.

  In the dynamic vibration absorber 1, the fixing mechanism 40 is a spacer 61, 63 as a first member having a surface that contacts the exposed portion of the first surface 31A, and a second member having a surface that contacts the second surface 31B. The restraining member 52 is provided. The fixing mechanism 40 includes spacers 62 and 64 as first members having a surface that contacts the exposed portion of the first surface 71A, a restraining member 53 as a second member having a surface that contacts the second surface 71B, and have. The fixing mechanism 40 includes first and second nuts 3A and 3C as tightening mechanisms for applying a tightening force for tightening the first member and the second member in the thickness direction. Thereby, the metal plates 31 and 71 can be more reliably restrained by applying the tightening force.

  The floor 10 includes a flooring 2 and the dynamic vibration absorber 1 arranged on the flooring 2. According to the floor 10, the vibration generated in the flooring 2 can be sufficiently transmitted to the dynamic vibration absorber 1 and the floor vibration can be effectively suppressed.

  The floor 10 includes a plurality of flooring materials 2 arranged so as to be adjacent to each other in the same plane, and the dynamic vibration damping device 1 arranged so as to straddle between the adjacent flooring materials 2. According to the floor 10, since the dynamic vibration damping device 1 is disposed so as to straddle between adjacent flooring materials 2, not only vibration generated in individual flooring materials 2 but also between adjacent flooring materials 2. Relative vibration can be reduced. Further, since a relative movement between adjacent flooring materials 2 and a gap between the movements occur in the vibration mode of the floor using the plurality of flooring materials 2, even when the dynamic vibration absorber 1 is arranged on the entire floor surface. By fixing between 2 and the flooring 2, the dynamic vibration absorber 1 can be easily excited.

  In the floor 10, the tightening force by the first and second nuts 3 </ b> A and 3 </ b> C is transmitted through the floor material 2. Thereby, the flooring 2 and the said dynamic vibration absorber 1 can be fixed using the clamping force by 1st and 2nd nut 3A, 3C.

[Another embodiment]
Finally, another embodiment of the present invention will be described.

  7 is not limited to a double damper structure having the first and second vibration damping plates 20 and 21 as in the dynamic vibration damping device 1, but a single damper structure including only the first vibration damping plate 20 as shown in FIG. A dynamic vibration absorber 1A having the above may be used. In this case, the restraining member 51 is disposed on the viscoelastic member 32 side, and the restraining member 53 is disposed on the metal plate 31 side. According to this structure, it becomes a simpler shape and can aim at cost reduction.

  In the dynamic vibration damping device 1, the spacers 61 to 64 may be omitted. In this case, the first and second suspension bolts 41 and 42 may expand in diameter in the holes of the viscoelastic members 32 and 72, and may contact the first surfaces 31A and 71A at the expanded diameter portions. In addition, a protrusion that protrudes downward from the lower surface of the restraining members 51 and 52 may be formed, and the protrusion may be inserted into the hole of the viscoelastic members 32 and 72 to contact the first surfaces 31A and 71A. Thereby, the metal plates 31 and 71 can be restrained in the thickness direction similarly to the case where the spacers 61 to 64 are fitted in the holes.

  The dynamic vibration absorber 1 is not limited to the case where the vibration damping plates 20 and 21 are fixed to the flooring 2 by the first and second suspension bolts 41 and 42, and may be fixed at one point. It may be fixed at three or more points. However, from the viewpoints of preventing the damping plates 20 and 21 from rotating and ensuring the ease of construction, it is preferable to fix the two damping points as in this embodiment.

  In the dynamic vibration damping device 1, the restraining members 51 to 53 may be omitted.

  In the floor 10, a tightening force that restrains the metal plates 31 and 71 in the thickness direction may be transmitted without the floor material 2.

  In the dynamic vibration damping device 1, the restraining members 51 to 53 may be omitted.

  In the floor 10, the dynamic vibration absorber 1 is not limited to the case where the dynamic vibration absorber 1 is disposed across two adjacent floor materials 2, and may be disposed on one floor material 2.

  It should be thought that embodiment disclosed this time is an illustration and restrictive at no points. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1,1A dynamic vibration absorber, 2 flooring material, 2D 1st fixing | fixed part, 2E 2nd fixing | fixed part, 3 fastening member, 10 floor, 20 1st damping plate, 21 2nd damping plate, 22 1st deformation part , 25 1st fulcrum area, 25A, 26A 1st support part, 25B, 26B 2nd support part, 26 2nd fulcrum area, 27 2nd deformation part, 31, 71 Metal plate, 31A, 71A 1st surface, 31B, 71B Second surface, 32, 72 Viscoelastic member, 32A Hole, 33 Exposed portion, 40 Fixing mechanism, 41 First suspension bolt, 41A, 42A One end, 41B, 42B The other end, 42 Second suspension bolt, 51 , 52, 53 Restraint member, 61, 62, 63, 64 Spacer

Claims (8)

A dynamic vibration absorber for suppressing vibration generated in a floor material,
A damping plate having a rectangular shape, and having a fulcrum area provided along the longitudinal direction of the rectangular shape, and a deformable portion elastically deformable in the thickness direction with the fulcrum area as a fulcrum,
A fixing mechanism having a portion fixed to the floor material and a portion fixed to the fulcrum region;
The damping plate is
A metal plate including a first surface facing one side in the thickness direction and a second surface facing the other side in the thickness direction;
A viscoelastic member disposed on the first surface so as to expose a part of the first surface;
The fixing mechanism constrains the metal plate in a thickness direction in a state in contact with the exposed portion of the first surface and the second surface ,
The fixing mechanism, extends in the longitudinal direction, to have a first constraining member and a second constraining member to restrict deformation in the thickness direction of the fulcrum area by sandwiching the fulcrum region in the thickness direction of the vibration plate, Dynamic vibration absorber. The fixing mechanism includes a first suspension bolt and a second suspension bolt,
The first suspension bolt includes one end fixed to a first fixing part of a flooring, and the other end fixed to the first support part of the fulcrum region,
The second suspension bolt includes one end fixed to the second fixing part of the flooring, and the other end fixed to the second support part that is separated from the first support part in the fulcrum region. The dynamic vibration damping device according to claim 1. Before SL fulcrum region, said first and second support site including dynamic vibration absorber according to claim 2. The viscoelastic member is formed with a hole for forming an exposed portion of the first surface,
The fixing mechanism includes a spacer that is disposed in the hole and includes a first spacer surface that contacts the first surface and a second spacer surface that contacts the first restraining member;
The metal plate is restrained in a thickness direction in a state where the first spacer surface is in contact with an exposed portion of the first surface and the second restraining member is in contact with the second surface . 4. The dynamic vibration absorber according to any one of 3 above. The fixing mechanism is
A first member having a surface in contact with the exposed portion of the first surface;
A second member having a surface in contact with the second surface;
The dynamic vibration damping device according to claim 1, further comprising: a tightening mechanism for applying a tightening force for tightening the first member and the second member in the thickness direction. Flooring,
A floor comprising: the dynamic vibration absorber according to any one of claims 1 to 5 disposed on the floor material. A plurality of flooring materials arranged adjacent to each other in the same plane;
A floor comprising: the dynamic vibration absorber according to any one of claims 2 to 4 disposed so as to straddle between adjacent floor materials. Flooring,
The dynamic vibration absorber according to claim 5 disposed on the flooring,
A floor in which a tightening force for tightening the first member and the second member in the thickness direction is transmitted through the flooring.

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