Vibration damper unit and vibration damper

Abstract

Provided are: a vibration damper unit having a novel structure and capable of efficiently exhibiting a vibration damping effect against vertical vibration that is a problem in a building structure; and a vibration damper suitable for use in the vibration damper unit. A vibration damper unit (10), which is attached to a building structure (A) and reduces vibration in the vertical direction of the building structure (A), is provided with a support base (12) that is fixedly attached to a structural member (a) of the building structure (A), which is a main vibration system. Each of the plurality of mass members (20) is elastically coupled to the support base (12) by a coupling member (22) provided with a spring element and a damping element, thereby constituting a plurality of sub-vibration systems (14), and the plurality of sub-vibration systems (14) constitute a TMD having a plurality of natural vibration frequencies in the vertical direction.

Description

Technical Field

[0001] The present invention relates to a vibration damping device unit for reducing vertical vibration in a building structure and a vibration damping device suitable for use in the vibration damping device unit. Background Art

[0002] Conventionally, as a vibration damping device for reducing vertical vibration (in the vertical direction) generated in a building structure, there is known, for example, as described in Japanese Unexamined Patent Application Publication No. 2017-198228 (Patent Document 1), a vibration damping device that forms a secondary vibration system with respect to a building structure as a main vibration system by supporting a mass body with respect to the building structure using a connecting member. This vibration damping device constitutes a TMD (Tuned Mass Damper) by tuning the natural vibration frequency of the secondary vibration system to a frequency band of vertical vibration that is a problem in the building structure.

[0003] Prior Art Documents

[0004] Patent Documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2017-198228 Summary of the Invention

[0006] Problems to be Solved by the Invention

[0007] However, the exciting forces of the vertical vibration that is a problem in the building structure include, in addition to walking vibration, mechanical vibration, etc. applied from the inside of the building structure, earthquake vibration, traffic vibration, etc. applied from the outside of the building structure, and there are various vibration transfer paths to the vibration part regarded as a problem. In addition, the vibration modes of each structural member constituting the vibration transfer path are also various, and the natural vibration frequencies of each structural member are also different, causing vertical vibration in a complexly coupled vibration mode. Therefore, as described in Patent Document 1, it is difficult to obtain a sufficient vibration damping effect for vertical vibration by directly assembling only one secondary vibration system to a specific part of the building structure.

[0008] The present invention has been completed in view of the above circumstances, and the problem to be solved is to provide a vibration damping device unit with a new structure that can efficiently exhibit a vibration damping effect against vertical vibration that is a problem in a building structure, and a vibration damping device suitable for use in the vibration damping device unit.

[0009] Means for Solving the Problems

[0010] Hereinafter, preferred embodiments for implementing the present invention will be described. However, each of the embodiments described below is illustratively described, and not only can they be appropriately combined and adopted, but also for the multiple constituent elements described in each embodiment, they can be recognized and adopted as independently as possible, and can also be appropriately combined with any of the constituent elements described in other embodiments and adopted. Thus, in the present invention, it is not limited to the embodiments described below, and various other embodiments can be realized.

[0011] The first embodiment is a vibration damping device unit that is assembled to a building structure and reduces the vertical vibration in the building structure. Among them, the vibration damping device unit has a support base that is fixedly installed on a structural member of the building structure as the main vibration system, and a plurality of mass body members are respectively elastically connected to the support base through connection members having spring elements and damping elements, thereby constituting a plurality of secondary vibration systems. These plurality of secondary vibration systems constitute a TMD having a plurality of natural vibration frequencies in the vertical direction.

[0012] According to the vibration damping device unit configured in accordance with this embodiment, since it has a plurality of secondary vibration systems with different natural vibration frequencies, it can effectively exert a vibration damping effect on the up-and-down vibration in a relatively wide frequency band as a whole. Therefore, even for up-and-down vibrations with complexly coupled vibration modes, for example, it can stably exert an effective vibration damping effect.

[0013] Moreover, since it becomes a unit structure in which these plurality of secondary vibration systems are integrated through the support base, for example, by connecting the support base to a structural member with relatively large resonance energy on the vibration transmission path, the vibration damping effect brought by the secondary vibration system can be directly applied to the specific structural member.

[0014] In addition, since the shape, size, etc. of the support base can be set with a relatively high degree of freedom, the installation space for the mass body members, etc. can also be set at a position far from the structural member to which the vibration damping effect brought by the secondary vibration system is to be applied, and the improvement of the design freedom can also be achieved. In addition, since the support base can be used to stably support the plurality of secondary vibration systems while ensuring the stability of the support surface, regardless of the shape, structure, etc. of the assembly position of the vibration damping device unit in the structural member, it can be stably assembled to the target structural member in a horizontal state.

[0015] In the second embodiment, based on the vibration damping device unit described in the first embodiment, the mass body member is supported by a plurality of the connection members, and the plurality of connection members are all composite structures formed by fixing a plurality of elastic members made of different materials to each other. Each of the plurality of elastic members constituting the connection member has a length dimension in the up-and-down direction capable of connecting the mass body member to the support base, and the mass body member is directly and elastically supported on the support base by the plurality of elastic members constituting the connection member.

[0016] According to the vibration damping device unit configured in accordance with this mode, each mass body member can be supported at multiple locations by connecting members, and stable support for the mass body member by the connecting members can be achieved.

[0017] In addition, for example, by directly supporting the mass body member with a plurality of elastic members made of different materials such as a metal spring and a rubber spring, spring characteristics, damping characteristics, etc. can be set with a greater degree of freedom in the sub-vibration system.

[0018] In the third mode, based on the vibration damping device unit described in the second mode, the plurality of elastic members constituting the connecting member are a metal helical spring and an elastomer, and the elastomer is fixedly connected to the surface of the spring wire of the metal helical spring so as to cover the entire surface, and is formed into a structure in which the elastomer connects between pitches of the spring wires adjacent in the vertical direction in the metal helical spring.

[0019] According to the vibration damping device unit configured in accordance with this mode, a soft spring characteristic can be achieved with excellent durability by the metal helical spring, and a vibration damping effect can also be obtained by the elastomer. In addition, the surface of the metal helical spring is covered with the elastomer, thereby suppressing flutter generated during elastic deformation in the resonance state of the metal helical spring by the damping action of the elastomer.

[0020] In addition, the bonding area between the surface of the spring wire of the metal helical spring and the elastomer can be ensured to be relatively large, and the bonding strength between the spring wire and the elastomer can be improved. Therefore, peeling of the elastomer from the metal helical spring, etc. can be prevented, and the elastomer can effectively follow the deformation of the metal helical spring, and the damping effect of the elastomer can be effectively obtained. By covering the surface of the metal helical spring with the elastomer, an improvement in durability due to rust prevention of the metal helical spring can also be expected.

[0021] By arranging the elastomer in such a way as to elastically connect between spring wires adjacent in the spring axis direction of the metal helical spring, local buckling-like deformation of the elastomer is prevented during compression deformation of the metal helical spring, and the deformation followability of the elastomer with respect to the deformation of the metal helical spring is high. Therefore, the damping effect of the elastomer, etc. can be efficiently exerted. In addition, since each mass body member is directly supported by the metal helical spring and the elastomer, the share of the load of the mass body member acting on the elastomer is reduced, and the change over time in characteristics caused by creep of the elastomer is alleviated.

[0022] In the fourth mode, based on the vibration damping device unit described in the third mode, the winding diameter of both end portions in the coil axis direction of the metal helical spring is larger than the winding diameter of the central portion.

[0023] According to the vibration damping device unit configured in accordance with this embodiment, the axially opposite end portions of the coil with a larger winding diameter overlap with the mass body member and the support base. Thus, when a compressive force acts on the metal helical spring, the metal helical spring is less likely to tilt due to its high vertical stability, and the mass body member is stably supported by the metal helical spring. Therefore, the generation of unnecessary vibrations (such as horizontal vibrations and rotations) of the mass body member can be suppressed. In addition, compared with the case where the winding diameter is increased throughout the entire metal helical spring, the elastomer fixed to the metal helical spring has a small diameter. Therefore, the spring constant of the connecting member can be set to be small to achieve a soft spring characteristic.

[0024] In the fifth embodiment, based on the vibration damping device unit described in the third or fourth embodiment, mounting flange members are provided at the vertically opposite end portions of the connecting member. The mounting flange members have bolt fixing portions fixed to one of the mass body member and the support base, and the elastomer constituting the connecting member is fixed to the mounting flange members.

[0025] According to the vibration damping device unit configured in accordance with this embodiment, by bolt-fixing the mounting flange members provided at the vertically opposite end portions of the connecting member to one of the mass body member and the support base, the vertically opposite end portions of the connecting member can be stably mounted to the mass body member and the support base. In addition, by fixing the elastomer to the mounting flange members, the mounting flange members can be held in an appropriate position relative to the connecting member.

[0026] The sixth embodiment is the vibration damping device unit described in the fifth embodiment, wherein, in the mounting flange member provided at at least one end of the connecting member, the bolt fixing portion relative to the mass body member or the support base can adjust the fixing position around the elastic central axis extending in the vertical direction of the connecting member.

[0027] According to the vibration damping device unit configured in accordance with this embodiment, the fixing position of the bolt fixing portion relative to the mass body member or the support base can be adjusted. Thus, at the vertical elastic central axis of the connecting member, a position offset of the bolt fixing portion relative to the mass body member or the support base is allowed, preventing poor installation of the connecting member to the mass body member or the support base. In addition, for example, when the mounting flange members provided at the two end portions of the connecting member are offset relative to the mass body member or the support base in the circumferential direction around the elastic central axis of the connecting member, if the mounting flange members are fixed to the mass body member and the support base in a state where torsional stress acts on the connecting member, there is also a risk of affecting the durability and spring characteristics of the connecting member. However, by enabling the fixing position of the bolt fixing portion to be adjusted in the circumferential direction, the action of unwanted torsional stress on the connecting member can be prevented.

[0028] In the seventh mode, on the basis of the vibration damping device unit described in any one of the first to sixth modes, each of the mass body members is elastically connected to the support base by a plurality of the connecting members arranged in parallel.

[0029] According to the vibration damping device unit configured in accordance with this mode, compared with the case where the mass body member is elastically connected to the support base by only one connecting member, it is possible to stabilize the support mode of the mass body member, for example, to prevent unwanted vibrations of the mass body member during vibration input. In addition, since the support of the mass body member is shared by a plurality of connecting members, the support load input to each connecting member can be reduced, and a reduction in creep of the elastic member can be achieved.

[0030] In the eighth mode, on the basis of the vibration damping device unit described in any one of the first to seventh modes, the plurality of mass body members are provided with the same mass, and the spring characteristics of the connecting members that elastically support the mass body members on the support base are made different among these plurality of mass body members, thereby constituting a plurality of sub-vibration systems having different natural vibration frequencies in the vertical direction.

[0031] According to the vibration damping device unit configured in accordance with this mode, for example, a common mass body member can be adopted, and a plurality of sub-vibration systems having different natural vibration frequencies in the vertical direction can be constituted by connecting members having different spring characteristics.

[0032] In the ninth mode, on the basis of the vibration damping device unit described in the eighth mode, the connecting members can be selected from a plurality of types prepared with different spring characteristics from each other, and by installing a plurality of the connecting members having the same spring characteristics on each of the mass body members, each of the mass body members is elastically supported by the support base in a state where the mass is evenly supported by the plurality of the connecting members.

[0033] According to the vibration damping device unit configured in accordance with this mode, by selecting a connecting member corresponding to the required characteristics from a variety of connecting members prepared with different spring characteristics from each other, a vibration damping device corresponding to the required characteristics can be selectively constituted. In addition, since one mass body member is supported by a plurality of connecting members, stable support of the mass body member by the connecting members can be achieved. In addition, by making the plurality of connecting members supporting one mass body member have the same spring characteristics, the support load of the mass body member is not concentrated on a specific connecting member but is dispersed, and an improvement in the durability of the connecting members, stabilization of the support of the mass body member, etc. can be achieved.

[0034] The tenth mode is based on the vibration damping device unit described in any one of the first to ninth modes. The vibration damping device unit is provided with a lateral vibration restriction mechanism that allows relative displacement of the mass body member with respect to the support base in the vertical direction and restricts the amount of relative displacement of the mass body member with respect to the support base in the horizontal direction.

[0035] According to the vibration damping device unit configured in accordance with this mode, it is possible to effectively obtain the target vibration damping performance in the vertical direction, and it is possible to suppress the displacement of the mass body member in the horizontal direction, which is not desired, by the lateral vibration restriction mechanism. As a result, it is possible to achieve space saving in the installation space around the mass body member, improvement in the durability of the connecting member, etc.

[0036] The eleventh mode is a vibration damping device for vertical vibration in a building structure. The connecting member that elastically supports the mass body member is composed of a composite structure body formed by fixing an elastic body to the surface of the spring wire of a metal helical spring so as to cover the entire surface of the spring wire. The elastic body is formed in a hollow structure having a central hole extending in the direction of the spring central axis of the metal helical spring.

[0037] According to the vibration damping device configured in accordance with this mode, it is possible to greatly ensure the bonding area between the surface of the spring wire of the metal helical spring and the elastic body, and to improve the bonding strength between the spring wire and the elastic body. Therefore, it is possible to prevent the elastic body from peeling off from the metal helical spring, etc., effectively generate the deformation of the elastic body following the deformation of the metal helical spring, and effectively obtain the damping effect of the elastic body.

[0038] By arranging the elastic body in such a manner as to elastically connect the spring wires adjacent in the spring axis direction of the metal helical spring, local buckling-like deformation of the elastic body is prevented during the compression deformation of the metal helical spring, and the deformation followability of the elastic body with respect to the deformation of the metal helical spring is high. Therefore, the damping effect of the elastic body can be efficiently exerted. In addition, since the mass body member is directly supported by the metal helical spring and the elastic body respectively, the shared support load of the mass body member acting on the elastic body is reduced, and the secular change in characteristics caused by creep of the elastic body is alleviated.

[0039] The twelfth mode is based on the vibration damping device described in the eleventh mode, and at least one of the inner peripheral surface and the outer peripheral surface of the elastic body has spiral irregularities extending in the winding direction of the spring wire of the metal helical spring.

[0040] According to the vibration damping device configured in accordance with the present mode, it is possible to increase the free surface area of the elastic body by means of unevenness, and it is possible to adjust characteristics such as spring and attenuation. Further, the unevenness is formed in a spiral shape extending in the winding direction of the spring wire of the metal helical spring, whereby the unevenness hardly affects the telescopic deformation of the metal helical spring.

[0041] In the thirteenth mode, based on the vibration damping device described in the eleventh or twelfth mode, a groove-shaped thinning portion is provided in the elastic body, and the thinning portion opens on the inner peripheral surface or the outer peripheral surface between the pitches of the spring wires adjacent in the vertical direction in the metal helical spring.

[0042] According to the vibration damping device configured in accordance with the present mode, by providing a thinning portion in the elastic body between the pitches of the spring wires, the amount of the portion compressed between the spring wires is reduced when a vibration in the vertical direction is input to the elastic body. Therefore, it is possible to prevent the elastic constant of the connecting member from increasing due to the compressive elasticity of the elastic body, and it is possible to gently tune the spring characteristics of the connecting member.

[0043] In addition, the vibration damping devices described in the eleventh to thirteenth modes can also arbitrarily and appropriately apply the respective corresponding configurations of the connecting members described in any one of the fourth to sixth modes.

[0044] Advantages of the Invention

[0045] According to the present invention, it is possible to provide a vibration damping device unit that can effectively exhibit a vibration damping effect on vibrations in the vertical direction that are problematic in building structures, and a vibration damping device suitable for use in the vibration damping device unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 is a plan view showing a vibration damping device unit as a first embodiment of the present invention.

[0047] Figure 2 is Figure 1 a front view of the vibration damping device unit shown.

[0048] Figure 3 is an enlarged longitudinal sectional view showing the connecting member constituting Figure 1 the vibration damping device unit, and is a view corresponding to the III-III section of Figure 4 .

[0049] Figure 4 is Figure 3 a plan view of the connecting member shown.

[0050] Figure 5 is the metal helical spring constituting Figure 3 the connecting member shown in a front view.

[0051] Figure 6 The front view and longitudinal sectional view of the connecting member that constitutes the vibration damping device unit as the second embodiment of the present invention.

[0052] Figure 7 The top view of the connecting member that constitutes the vibration damping device unit as the third embodiment of the present invention. Detailed Embodiment

[0053] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0054] Figure 1 , Figure 2 Reference numeral 10 denotes a vibration damping device unit as the first embodiment of the present invention. The vibration damping device unit 10 has a structure in which a plurality of vibration damping devices 14 are mounted on a support base 12. In the following description, in principle, the vertical direction refers to the vertical up-and-down direction of the building structure A, Figure 2 the front-back direction refers to the up-and-down direction in Figure 1 and the left-right direction refers to the left-right direction in Figure 1 .

[0055] As Figure 1 shown, the support base 12 has a structure in which four first beam members 16 extending in the front-back direction, the first beam members 16, the first beam members 16, the first beam members 16 are disposed across between two second beam members 18 extending in the left-right direction. Both the first beam members 16 and the second beam members 18 extend linearly and are high-rigidity steel materials, which are H-shaped steel in the present embodiment. The four first beam members 16, the first beam members 16, the first beam members 16, the first beam members 16 are arranged side by side and separated from each other in the left-right direction. The two second beam members 18, the second beam members 18 are arranged side by side and separated from each other in the front-back direction. Both ends of each first beam member 16 are fixed to one of the second beam members 18, the second beam members 18 by means such as welding and bolt fixing, thereby constituting the support base 12.

[0056] The vibration damping device 14 damps the vibration of the building structure A in the vertical up-and-down direction. As Figure 1 , Figure 2As shown, there is a structure in which a mass body member 20 is supported by a plurality of connecting members 22. The mass body member 20 is formed in a substantially rectangular block shape and is preferably formed of a material having a large specific gravity such as iron. The length dimension of the mass body member 20 in the left-right direction is greater than the distance between the adjacent first beam members 16, 16. The length dimension of the mass body member 20 in the front-rear direction is less than half of the distance between the two second beam members 18, 18. Threaded holes (not shown) that open on the lower surface are formed at the four corner portions of the mass body member 20. Four of these threaded holes are provided at each corner portion of the mass body member 20 and are arranged at positions corresponding to the respective bolt holes 36 of the mounting flange member 34 described later. The mass of the mass body member 20 is set in consideration of the mass of the building structure A to be vibration-damped, the frequency of the vibration to be damped, the vertical spring constant of the connecting member 22, and the like. In the present embodiment, the entire mass body member 20 is formed as a single block, but for example, the mass body member 20 can also be formed by overlapping and fixing a plurality of metal plates, and the mass of the mass body member 20 can be adjusted by changing the number of overlapping metal plates.

[0057] As Figure 3 , Figure 4 shown, the connecting member 22 is formed as a composite structure having a structure in which an elastomer 26 as another elastic member is fixed to a metal helical spring 24 as an elastic member. The connecting member 22 includes a spring element and a damping element. The spring element is composed of the metal helical spring 24 and the elastomer 26, and the damping element is composed of the elastomer 26.

[0058] Also as Figure 5 shown, the metal helical spring 24 has a structure in which a spring wire 28 formed of spring steel extends in a spiral shape. In the metal helical spring 24, the axially both end portions of the spring wire 28 are formed as large-diameter portions 30 having a winding diameter larger than that of the axially central portion of the spring wire 28. In the present embodiment, the large-diameter portion 30 of the spring wire 28 is provided over substantially one turn at the axial end of the metal helical spring 24. In the metal helical spring 24 of the present embodiment, the cross-sectional shape of the spring wire 28 is substantially circular and is substantially constant in the length direction of the spring wire 28. However, the cross-sectional shape and cross-sectional area of the spring wire 28 of the metal helical spring 24 may vary in the length direction, and the cross-sectional shape is not limited to a circle. In addition, the both end portions of the metal helical spring 24 may be ground, and by making the surface overlapping with the mounting flange member 34 described later a flat surface, the inclination of the metal helical spring 24 can be suppressed.

[0059] The elastomer 26 is fixedly attached to the surface of the metal helical spring 24, and as a whole, it is formed into a hollow structure in a cylindrical shape corresponding to the metal helical spring 24, and has a central hole 31 penetrating in the vertical direction. The elastomer 26 is fixedly attached in such a manner as to cover the entire surface of the spring wire 28 of the metal helical spring 24, and the metal helical spring 24 is disposed inside the elastomer 26 in a buried state. The portion of the elastomer 26 covering the outer peripheral side of the metal helical spring 24 is thicker than the portion covering the inner peripheral side. The elastomer 26 is formed of, for example, rubber or a resin elastomer and has rubber-like elasticity. The elastomer 26 is preferably formed of a material that obtains a large energy attenuation effect based on internal friction and the like through elastic deformation, and is formed of rubber in the present embodiment. The elastomer 26 can also be formed of a material having a plurality of bubbles inside, such as foamed rubber, for example.

[0060] Since the diameter of the middle portion of the metal helical spring 24 deviating from the large-diameter portion 30 and in the vertical direction of the large-diameter portion 30 is smaller than that of the large-diameter portion 30, the diameter of the middle portion in the vertical direction of the elastomer 26 fixedly attached to the metal helical spring 24 is small. Thus, compared with the case where the entire vertical direction is a large diameter corresponding to the fixedly attached portion to the large-diameter portion 30, the spring constant in the vertical direction of the elastomer 26 becomes smaller, and a low spring characteristic in the vertical direction can be set for the connecting member 22.

[0061] The elastomer 26 has a groove-shaped thinning portion 32 that opens on the inner peripheral surface between the pitches of the spring wire 28 of the metal helical spring 24. The thinning portion 32 extends in a spiral shape along the winding direction of the spring wire 28 of the metal helical spring 24. The elastomer 26 is formed into a thin wall in the radial direction between the pitches of the spring wire 28 by forming the thinning portion 32, and the compression spring constant in the axial vertical direction is reduced. The deepest part of the thinning portion 32 is located at a position closer to the outer periphery than the axial central portion of the metal helical spring 24 other than the large-diameter portion 30. In short, the elastomer 26 does not continuously fill between the spring wires 28 adjacent in the coil axis direction of the metal helical spring 24 in the axial direction.

[0062] In addition, in the present embodiment, concavo-convex portions extending in a spiral shape are formed on the inner peripheral surface of the elastomer 26 through the thinning portion 32, but instead of or in addition to the concavo-convex portions on the inner peripheral surface, concavo-convex portions extending in a spiral shape can be formed on the outer peripheral surface of the elastomer 26. In the present embodiment, the outer peripheral surface of the elastomer 26 has minute concavo-convex portions that protrude outward between the pitches of the spring wire 28, but is formed into a substantially cylindrical shape as a whole. That is, in the present embodiment, on both the inner peripheral surface and the outer peripheral surface of the elastomer 26, there are curved concavo-convex portions protruding outward between the spring wires 28 adjacent in the spring axis direction.

[0063] In addition, in the present embodiment, the depth of the thinning portion 32 (the coil radial position of the deepest part) is substantially the same as the outer diameter of the winding of the metal helical spring 24. However, the depth of the thinning portion 32 is not limited. For example, it may be smaller than the inner diameter of the winding of the metal helical spring 24 or larger than the outer diameter of the winding. However, it is preferred that the depth of the thinning portion 32 is larger than the inner diameter of the winding and is formed in a manner of digging out between the windings adjacent in the coil axial direction. In addition, as will be described later, in the case of using a thinning portion that opens on the outer peripheral surface of the elastic body 26, similarly, the depth of this thinning portion is not limited, but it is preferably formed to be smaller than the outer diameter of the winding, so as to be formed in a manner of digging out between the windings adjacent in the coil axial direction.

[0064] In the metal helical spring 24, the pitches between the spring wires 28 adjacent in the vertical direction are connected by the elastic body 26. In the present embodiment, by forming the thinning portion 32, the pitches between the spring wires 28 are connected by the elastic body 26 on the outer peripheral side of the spring wire 28.

[0065] Mounting flange members 34a and 34b are fixedly connected to the axial both ends of the elastic body 26. The mounting flange member 34 is formed in a substantially rectangular plate shape with rounded corners, and is formed into a substantially square whose side lengths in the vertical direction view are larger than the winding diameter of the large diameter portion 30 of the metal helical spring 24.

[0066] Bolt holes 36 serving as bolt fixing portions that penetrate in the vertical direction are respectively formed at the four corner portions of the mounting flange member 34. The bolt holes 36 of the present embodiment are circular holes. The four bolt holes 36, bolt holes 36, bolt holes 36, bolt holes 36 are located on a concentric imaginary circle with respect to the metal helical spring 24 and are equidistant from the central axis of the metal helical spring 24. In addition, the four bolt holes 36, bolt holes 36, bolt holes 36, bolt holes 36 are located on the diagonal lines of the mounting flange member 34, and the intersection point of the diagonal lines of the mounting flange member 34 is located on the central axis of the metal helical spring 24.

[0067] A circular through hole 38 that penetrates in the vertical direction is formed in the central portion of the mounting flange member 34. The diameter of the through hole 38a of one mounting flange member 34a is larger than the diameter of the through hole 38b of the other mounting flange member 34b, and a ring-shaped fitting 40 separated from the mounting flange member 34a is press-fitted and fixed in the through hole 38a.

[0068] Axial end portions of the elastic body 26 internally provided with the metal helical spring 24 are fixedly connected to the mounting flange member 34a and the mounting flange member 34b. The elastic body 26 is vulcanized and bonded to the mounting flange member 34a and the mounting flange member 34b at positions on the outer periphery side of the through holes 38a and 38b. Since the axial end portions of the elastic body 26 that are large-diameter and fixedly connected to the large-diameter portion 30 of the metal helical spring 24 are fixedly connected to the mounting flange member 34, an improvement in the fixing strength can be achieved. The bolt holes 36 provided at the four corner portions of the mounting flange member 34a and the mounting flange member 34b are all located on the outer periphery side of the elastic body 26 and are exposed without being covered by the elastic body 26.

[0069] The metal helical spring 24 and the mounting flange member 34a and the mounting flange member 34b can overlap in a state of being in direct contact, but by overlapping with the elastic body 26 in between, it is easy to prevent shaking and the like. In particular, since the large-diameter portion 30 of the metal helical spring 24 overlaps with the mounting flange member 34 with the elastic body 26 in between, it is difficult for the metal helical spring 24 to have an undesired inclination. The elastic body 26 interposed between the overlapping surfaces of the metal helical spring 24 and the mounting flange member 34 is thin enough, and the length dimension of the metal helical spring 24 in the vertical direction is substantially the same as the length dimension of the elastic body 26 in the vertical direction. The length dimensions of the metal helical spring 24 and the elastic body 26 in the vertical direction are both of a size capable of connecting the mounting flange member 34a and the mounting flange member 34b to each other in the vertical direction. In addition, the elastic body 26 interposed between the overlapping surfaces of the metal helical spring 24 and the mounting flange member 34 is thin enough, so that there is almost no influence of the elastic body 26 between these overlapping surfaces on the characteristics such as spring and attenuation, and in terms of characteristics, it is substantially the same as the state where the metal helical spring 24 and the mounting flange member 34 overlap directly, and thus it can be regarded as the metal helical spring 24 and the mounting flange member 34 being directly connected.

[0070] An inner mold (not shown) for forming the inner peripheral surface of the elastic body 26 is taken out through the through hole 38a of the mounting flange member 34a after the vulcanization molding of the elastic body 26. Then, after taking out the inner mold, the annular fitting 40 is fixed to the through hole 38a. Therefore, the inner peripheral edge of the mounting flange member 34a (the opening peripheral edge of the through hole 38a) is located on the outer periphery side of the deepest part (the outermost peripheral end) of the thinning portion 32 in the elastic body 26.

[0071] As Figure 1 、 Figure 2As shown, the connecting member 22 is installed on the mass body member 20. That is, a bolt 42 inserted through the bolt hole 36 of the mounting flange member 34b is screwed into an unillustrated threaded hole opened on the lower surface of the mass body member 20, whereby the upper end portion of the connecting member 22 is fixed to the mass body member 20. Four connecting members 22, 22, 22, 22 are installed side by side at the four corner portions of one mass body member 20. Thus, a vibration damping device 14 is constituted in which the four corner portions of the mass body member 20 are elastically supported by the four connecting members 22, 22, 22, 22.

[0072] Preferably, the four connecting members 22, 22, 22, 22 constituting one vibration damping device 14 have the same spring characteristics as each other. In addition, it is preferable that these four connecting members 22, 22, 22, 22 are common members having the same shape, size, structure, material, etc. Thus, a state is achieved in which the mass of the mass body member 20 is evenly supported by the four connecting members 22, 22, 22, 22. Therefore, it is possible to prevent the load supported by the mass body member 20 from acting concentratedly on a specific connecting member 22, or prevent the mass body member 20 from swinging in an undesired form during vibration input and other adverse conditions. In addition, for example, it may also be possible to select a connecting member 22 having a required spring characteristic from a plurality of connecting members 22 having different spring characteristics prepared in advance, and install the four connecting members 22, 22, 22, 22 having the same selected spring characteristic on one mass body member 20.

[0073] The vibration damping device 14 constitutes a sub-vibration system by being installed on the support base 12. That is, a bolt 44 inserted through the bolt hole 36 of the mounting flange member 34a is inserted through an unillustrated bolt hole of the support base 12 and screwed with an unillustrated nut, whereby the lower end portions of the respective connecting members 22 of the vibration damping device 14 are fixed to the support base 12. Two of the four connecting members 22, 22, 22, 22 installed on the mass body member 20 are installed on each one of the first beam members 16, 16, and the other two connecting members 22 are installed on the second beam member 18. The mass body member 20 is directly and elastically supported on the support base 12 by either the metal helical spring 24 or the elastic body 26 constituting the connecting member 22. In short, the metal helical spring 24 and the elastic body 26 in the connecting member 22 are arranged in parallel in the supporting direction of the mass body member 20, that is, the up-and-down direction, and connect the mass body member 20 to the support base 12 respectively.

[0074] In the present embodiment, four vibration damping devices 14 are mounted on the support base 12 separately from each other in the front-rear direction and the left-right direction. Thus, a vibration damping device unit 10 is formed as a TMD (Tuned Mass Damper) having four sub-vibration systems. By mounting four vibration damping devices 14 on the support base 12, the mass of the entire vibration damping device unit 10 can be ensured sufficiently, and the mass of the mass body member 20 of each vibration damping device 14 can be reduced. Therefore, the installation operation of the vibration damping device 14 on the support base 12 becomes easy, and the manufacturing, storage, transportation, etc. of the vibration damping device 14 also become easy.

[0075] As Figure 2 shown, the vibration damping device unit 10 configured in such a manner is assembled to the building structure A by fixedly mounting the support base 12 to a structural member a such as a floor structural member of the building structure A that constitutes the main vibration system. The method of installing the support base 12 to the structural member a is not particularly limited. For example, the support base 12 is installed to the structural member a by bolt fixing or welding fixing.

[0076] Since it is a unit structure in which a plurality of vibration damping devices 14 are integrated by the support base 12, for example, by connecting the support base 12 to the structural member a whose vibration becomes large due to the resonance phenomenon, the vibration damping effect brought by the vibration damping device 14 can be directly applied to the structural member a.

[0077] In addition, by appropriately setting the shape, size, etc. of the support base 12, it is also possible to set the installation space for the mass body member 20, etc. at a position away from the structural member a to be vibration-damped, and it is also possible to improve the design freedom. In addition, since the plurality of vibration damping devices 14 are stably supported by the support base 12, the vibration damping device 14 can be stably assembled to the structural member a in a horizontal state regardless of the shape, structure, etc. of the assembly portion of the vibration damping device unit 10 in the structural member a.

[0078] When the structural member a on which the vibration damping device unit 10 is installed is vibrated in the up-down direction, the up-down vibration input from the structural member a to the support base 12 is transmitted to the mass body member 20 via the connection member 22, and the mass body member 20 is displaced in the up-down direction. And the kinetic energy of the mass body member 20 converted from the vibration energy of the vibration to be damped is absorbed by the energy attenuation action of the elastic body 26 constituting the connection member 22. Thus, by the dynamic vibration absorption action of the sub-vibration system (vibration damping device 14) constituting the vibration damping device unit 10, the vibration in the vertical direction (up-down direction) of the structural member a to be vibration-damped and even the building structure A can be reduced.

[0079] When each vibration damping device 14 vibrates by inputting a vibration at a tuned frequency preset according to the mass of the mass body member 20 and the spring constant of the connection member 22, the mass body member 20 actively displaces in a resonance state, and thus exhibits an excellent vibration damping effect brought about by the above-described dynamic vibration absorption effect. On the other hand, for an input vibration at a frequency deviated from the tuned frequency, the displacement of the mass body member 20 becomes smaller, and sometimes an effective vibration damping effect cannot be exhibited. Therefore, the natural vibration frequencies (resonance frequencies of the mass-spring system) in the vertical direction of the four vibration damping devices 14, 14, 14, 14 constituting the vibration damping device unit 10 are different from each other. As a result, the four vibration damping devices 14, 14, 14, 14 exhibit vibration damping effects on various vibrations having different frequencies, and the vibration damping device unit 10 as a TMD having vibration damping performance for input vibrations in a wider frequency band is realized.

[0080] As a means for making the natural vibration frequencies of the four vibration damping devices 14, 14, 14, 14 different from each other, the masses of the mass body members 20 of the respective vibration damping devices 14 may be different from each other, but it is preferable to make the spring characteristics of the connection members 22 of the respective vibration damping devices 14 different from each other. Thereby, it is possible to make the large and heavy mass body members 20 common, and it is possible to obtain a plurality of vibration damping devices 14 having different natural vibration frequencies. In the present embodiment, the masses of the four mass body members 20, 20, 20, 20 are the same, and the spring characteristics in the vertical direction of the connection members 22 of the respective vibration damping devices 14 are different from each other, and different natural vibration frequencies in the vertical direction are set for the four vibration damping devices 14, 14, 14, 14. The natural vibration frequency of each vibration damping device 14 is appropriately set according to the vibration state of the building structure A to be vibration-damped (for example, the frequency of the vibration to be vibration-damped, etc.). For example, it is set to exhibit an effective vibration damping effect on vibrations of 3 Hz to 30 Hz that are likely to cause problems in the building structure A.

[0081] In addition, when making the natural vibration frequencies of the four vibration damping devices 14, 14, 14, 14 different, it is not necessarily required to make all the natural vibration frequencies of the four vibration damping devices 14, 14, 14, 14 different. For example, the natural vibration frequencies of the four vibration damping devices 14, 14, 14, 14 may be adjusted to be the same for every two, and the natural vibration frequencies may be different between the two vibration damping devices 14, 14 and the other two vibration damping devices 14, 14.

[0082] The connecting member 22 of the vibration damping device 14 has a structure in which an elastomer 26 is integrally fixed to the surface of the metal helical spring 24, and is formed into a new structure that integrally has a spring element and a damping element that are not present in the existing vibration damping device for building structures. According to such a connecting member 22, compared with the existing vibration damping device having a structure in which a spring element and a damping element (damper) are separately provided, the structure becomes simple, and it can also be provided in a narrower installation space. In addition, by adjusting the resonance frequency of the mass-spring system (sub-vibration system) with the connecting member 22 as the spring according to the natural vibration frequency of the building structure A as the main vibration system, the vibration in the resonance frequency band of the main vibration system can be effectively reduced by the sub-vibration system. Since the connecting member 22 is a composite structure body that has the metal helical spring 24 and the elastomer 26 juxtaposed (not in series) between the main vibration system and the sub-vibration system, not only through the spring characteristics of the metal helical spring 24, but also through the spring characteristics of the elastomer 26, the resonance frequency of the sub-vibration system can be adjusted, and a relatively large degree of freedom in tuning the resonance frequency can be obtained.

[0083] The elastomer 26 integrally fixed to the surface of the metal helical spring 24 deforms following the up-and-down telescopic deformation of the metal helical spring 24, and it is difficult to generate buckling-like deformation. Therefore, the characteristics such as damping and spring that are the targets can be obtained efficiently and stably.

[0084] In addition, the load input from the mass body member 20 to the connecting member 22 is shared and supported by the metal helical spring 24 and the elastomer 26. Therefore, by reducing the input of the load to the elastomer 26, changes in characteristics caused by creep of the elastomer 26 can be prevented, and damage caused by excessive deformation of the elastomer 26 can be prevented.

[0085] In addition, since the elastomer 26 is integrally fixed to the surface of the metal helical spring 24, the fixing area of the elastomer 26 with respect to the metal helical spring 24 becomes larger, achieving an improvement in the fixing strength and preventing the elastomer 26 from peeling off from the metal helical spring 24.

[0086] Furthermore, the elastomer 26 is integrally fixed to the surface of the metal helical spring 24, and thus it is also possible to expect to achieve low spring characteristics and further reduce creep, etc. That is, when the metal helical spring 24 elastically deforms in the spring axial direction, it twists and deforms around the central axis of the spring wire 28. Therefore, the elastomer 26 fixed to the surface of the metal helical spring 24 also undergoes an elastic deformation such as twisting along the surface of the spring wire 28. Since this elastic deformation is accompanied by shear deformation, compared with an elastomer that simply undergoes compressive deformation in the opposing direction between the support base 12 of the vibration damping device unit 10 and the structural member a of the building structure A, it is also possible to expect to avoid a significant increase in spring hardness and increase the attenuation component. In particular, since the elastomer 26 is fixed so as to cover the entire surface of the metal helical spring 24, compared with the case where the elastomer is fixed only to a part of the surface of the metal helical spring 24, for example, the torsional deformation of the spring wire 28 can effectively act on the elastomer 26 as an elastic deformation including a shear component. Furthermore, as in the present embodiment, by providing a thinning portion 32 in the elastomer 26 or imparting an uneven shape that bends outward between the pitches of the metal helical spring 24, it is possible to expect stabilization of the bending shape during compressive deformation in the spring axial direction, and it is also possible to expect increased efficiency in the manifestation of a deformation mode including a shear component, and further improvement in the balance between low elasticity and high attenuation in the elastomer 26 associated therewith.

[0087] Figure 6 Denote the connecting member 50 of the vibration damping device constituting the vibration damping device unit of the second embodiment of the present invention. The connecting member 50 has a structure in which an elastomer 54 as another elastic member is fixed to a metal helical spring 52 as an elastic member. In the following description, for members and parts that are substantially the same as those in the first embodiment, the same reference numerals are used in the drawings and the description is omitted. Figure 6 The shown connecting member 50 has a right side as a front view and a left side as a longitudinal sectional view with respect to the left - right center shown by a single - dotted line in the figure. The connecting member 50 of the present embodiment, like the connecting member 22 of the first embodiment, elastically connects a mass body member (not shown) and a support base to constitute a vibration damping device.

[0088] Compared with the metal helical spring 24 of the first embodiment, the difference between the length dimension in the up - down direction and the outer diameter dimension of the metal helical spring 52 becomes smaller. In addition, compared with the metal helical spring 24 of the first embodiment, the number of turns of the spring wire 28 of the metal helical spring 52 is smaller.

[0089] The elastomer 54 has a substantially cylindrical hollow structure and is fixedly attached to the entire surface of the spring wire 28 that constitutes the metal helical spring 52. The inner peripheral surface of the elastomer 54 has wavy concavities and convexities. The outer peripheral surface of the middle part in the vertical direction of the elastomer 54 has concavities and convexities corresponding to the inner peripheral surface. Thus, the cross-sectional center line L extending in the vertical direction of the elastomer 54 is formed in a wavy shape that protrudes outward from between the pitches of the spring wires 28 adjacent in the vertical direction and protrudes inward at the fixed part of the spring wire 28. The middle part of the spring wire 28 of the metal helical spring 52, except for the large-diameter part 30 where the winding diameter increases, is fixedly attached to the inside of the elastomer 54 between the convex part of the inner peripheral surface and the concave part of the outer peripheral surface. In other words, the convex part of the inner peripheral surface of the elastomer 54 is located on the inner periphery of the spring wire 28 of the metal helical spring 52, and the concave part of the outer peripheral surface of the elastomer 54 is located on the outer periphery of the spring wire 28. The concavities and convexities of the inner peripheral surface and the outer peripheral surface of the elastomer 54 extend spirally along the spring wire 28 of the metal helical spring 52. In the projection in the vertical direction, the elastomer 54 is arranged at a position overlapping with the spring wire 28 (except for the large-diameter part 30). When the metal helical spring 52 is compressed, a part of the elastomer 54 is directly compressed axially between the spring wires 28 adjacent in the vertical direction.

[0090] In the connecting member 50 of such an embodiment, concavities and convexities are provided on the inner peripheral surface and the outer peripheral surface of the elastomer 54, and the spring wire 28 of the metal helical spring 52 is fixedly attached between the convex part of the inner peripheral surface and the concave part of the outer peripheral surface of the elastomer 54. Therefore, in the part of the elastomer 54 located between the pitches of the spring wires 28 adjacent in the coil axial direction, the cross-sectional center line L bends so as to protrude outward. Therefore, for example, when the metal helical spring 52 contracts in the vertical direction and the pitch of the adjacent spring wires 28 becomes smaller, the elastomer 54 located between the pitches of the adjacent spring wires 28 is likely to deform in a manner of bulging outward, thereby reducing the compression elastic component in the vertical direction. Although the elastomer 54 has a substantially cylindrical shape as a whole, at the part where the metal helical spring 52 is fixedly attached to the spring wire 28, even when the connecting member 50 is compressed and deformed, the expansion deformation can be suppressed by the metal helical spring 52. By elastically deforming the part located between the spring wires 28 adjacent in the axial direction (between the pitches) in a manner of bulging outward, a reduction in compression deformation and an increase in shear deformation can be achieved, and the avoidance of local buckling-like deformation can also be achieved.

[0091] Figure 7 Reference numeral 60 denotes a connecting member of a vibration damping device that constitutes a vibration damping device unit according to the third embodiment of the present invention. The connecting member 60 has a structure in which mounting flange members 62 are fixedly attached to the upper and lower end portions of the elastomer 26, respectively.

[0092] The mounting flange member 62 is in the shape of a substantially rectangular plate, and bolt holes 64 serving as bolt fixing portions are respectively formed at four corner portions. The bolt holes 64 in the present embodiment are formed as long holes that penetrate the mounting flange member 62 in the vertical direction and extend in the circumferential direction of the elastic body 26. Thereby, when the mounting flange member 62 is bolt-fixed to a mass member or a support base (not shown), the relative position of the bolt hole 64 with respect to the mass member or the support base, that is, the orientation of the vibration damping device, can be adjusted in the circumferential direction around the elastic central axis extending in the vertical direction of the elastic body 26.

[0093] In this way, the mounting orientation of the mounting flange member 62 with respect to the support base can be adjusted in the circumferential direction. Thereby, it is possible to prevent a stress in the torsional direction from acting on the elastic body 26 due to errors in the vertical mounting flange members 62 and the circumferential orientation of the mounting flange member 62. For example, in the case where the metal coil spring 24 and the mounting flange members 62 are disposed in the forming cavity of the elastic body 26 and the elastic body 26 is formed, even when the upper and lower mounting flange members 62 are relatively displaced around the central axis due to the forming shrinkage of the elastic body 26 or the like, it is possible to avoid generating an initial stress on the metal coil spring 24 and the elastic body 26, and the upper and lower mounting flange members 62 can be respectively bolt-fixed to one of the mass member and the support base of the vibration damping device unit.

[0094] In addition, in the case where a circular bolt hole 36 is used as the bolt fixing portion as in the mounting flange member 34 of the vibration damping device 14 in the first embodiment, for example, by making the bolt hole formed in the mass member 20 or the support base 12 a long hole, the orientation and the mounting position of the vibration damping device 14 can be adjusted.

[0095] As described above, the embodiments of the present invention have been described in detail, but the present invention is not limited to this specific description. For example, in the above embodiment, the plurality of mass members 20 are shared, but the masses, shapes, sizes, specific gravities (materials), etc. of the plurality of mass members can also be different from each other. In the case where the masses of the plurality of mass members are different from each other, even if the spring constants of the connection members supporting the respective mass members are the same, vibration damping devices having different natural vibration frequencies can be constituted. In addition, in order to prevent excessive enlargement and ensure the necessary mass, the mass member is preferably made of a metal having a large specific gravity, but is not limited to metal.

[0096] The plurality of elastic members constituting the connecting member 22 are not necessarily limited to the metal helical spring 24 and the elastic body 26. In addition, the connecting member may also be constituted by combining three or more different elastic members. For example, as one mode, in the above-described embodiment, a metal helical spring without an elastic body may be independently added to other positions or added and disposed in a housed state in the hollow interior of the connecting member 22.

[0097] In the above-described first embodiment, a concave thinning portion 32 that opens on the inner peripheral surface is formed in the elastic body 26 between the pitches of the spring wire 28 of the metal helical spring 24. However, for example, a thinning portion may be formed between the pitches of the spring wire 28 so as to open on the outer peripheral surface of the elastic body 26. By adopting a thinning portion that opens on the outer peripheral surface of the elastic body, the inner peripheral surface of the elastic body is made into a substantially straight cylindrical surface that extends with a substantially constant inner diameter dimension, and it is also possible to facilitate demolding during forming. In addition, a thinning portion that opens on the inner peripheral surface of the elastic body 26 and a thinning portion that opens on the outer peripheral surface of the elastic body 26 may be provided between the pitches of the spring wire 28, respectively. In this case, the thinning portion that opens on the inner peripheral surface of the elastic body 26 and the thinning portion that opens on the outer peripheral surface of the elastic body 26 may be provided at the same pitch in the vertical direction or at different pitches. In addition, the thinning portion is not essential and may be omitted. In addition, the thinning portion does not necessarily have to extend spirally between the pitches of the spring wire 28. For example, it may be intermittently provided in the winding direction of the spring wire 28 or provided pointwise at multiple locations.

[0098] In the above-described second embodiment, an example in which unevenness is provided on both the inner peripheral surface and the outer peripheral surface of the elastic body 26 is shown. However, the unevenness may be provided only on either the inner peripheral surface or the outer peripheral surface of the elastic body 26. In addition, it is not necessary to provide both concave and convex portions, and only either the concave or convex portion may be provided. Therefore, for example, a concave or convex portion may be provided on both the inner peripheral surface and the outer peripheral surface. By setting axial unevenness on the inner peripheral surface and / or the outer peripheral surface of the elastic body 26, the deformation state of the elastic body 26 during compressive deformation can be specified to actively cause it to bend and deform, and it is also possible to expect suppression of buckling-like deformation caused by compressive deformation. In addition, for this purpose, it is preferable to form one unevenness on the inner peripheral surface or the outer peripheral surface so as to straddle the spring wires 28 of the metal helical springs 52 adjacent in the axial direction. However, for example, it may be formed such that a plurality of unevenness are connected on the inner peripheral surface or the outer peripheral surface between the spring wires 28 of the metal helical springs 52 adjacent in the axial direction.

[0099] The number of the vibration damping devices 14 constituting the vibration damping device unit 10 is not particularly limited as long as it is plural, and may be two or three, or may be five or more. In addition, in the vibration damping device 14, the number of the connection members 22 supporting one mass body member 20 is merely an example, and may be three or less, or may be five or more. However, in order to stably support the mass body member 20, it is preferable that one mass body member 20 is supported by three or more connection members 22. The mass of one mass body member should be set in consideration of the number of mass bodies, building structures, target vibrations, connection members, etc., and is not construed restrictively. For example, in the case of four mass body members as in the embodiment, it may be set to about 100 kg or more (or less).

[0100] The specific structure of the support base 12 is not restrictively construed by the above embodiment. In particular, the arrangement of the first beam member and the second beam member can be appropriately changed according to the number and arrangement of the connection members 22 in the vibration damping device 14. In addition, the support base 12 of the above embodiment is made lightweight by being constituted by the first beam member and the second beam member, but the support base is not limited to a structure formed by combining a plurality of beam members, and as long as it can support a plurality of vibration damping devices 14 and can be installed on the building structure A, it can also be, for example, in a plate shape or the like. Further, in the above embodiment, the beam members 16 and 18 constituting the support base 12 are not limited to H-shaped steel, and other shaped steels such as box-shaped steel can also be used, for example.

[0101] For example, a lateral vibration limiting mechanism that allows relative displacement of the mass body member 20 with respect to the support base 12 in the vertical direction and limits the relative displacement amount of the mass body member 20 with respect to the support base 12 in the horizontal direction can also be provided. The lateral vibration limiting mechanism only needs to have a lateral vibration limiting mechanism that allows the mass body member 20 to move up and down and limits horizontal movement, and the specific structure is not limited. For example, a rod-shaped member protruding from the mass body member 20 toward the support base 12 is provided, and the lateral vibration limiting mechanism is constituted by inserting the rod-shaped member through an insertion hole penetrating the support base 12, and the displacement amount of the mass body member 20 in the horizontal direction is limited by the engagement between the rod-shaped member and the inner peripheral surface of the insertion hole.

[0102] Furthermore, by disposing an elastic body between the opposing directions of the rod-shaped member and the inner peripheral surface of the insertion hole to form a bushing shape, for example, for a minute input in the horizontal direction, spring, attenuation, etc. brought by the elastic body can also be obtained. In addition, by disposing a bearing or a slider that allows relative displacement of the rod-shaped member and the support base 12 in the vertical direction and does not allow relative displacement in the horizontal direction between the opposing directions of the rod-shaped member and the inner peripheral surface of the insertion hole, the displacement of the mass body member 20 in the horizontal direction can also be prevented. In addition, a vertical position limiting mechanism that limits excessive displacement of the mass body member 20 in the vertical direction can also be provided.

[0103] In order to achieve low spring characteristics and stability during input, the metal helical spring 24 preferably has large-diameter portions 30 with a large winding diameter at both end portions in the axial direction of the coil. However, for example, it may also have a substantially constant winding diameter throughout its entire length. The end portions of the metal helical spring 24 are preferably overlapped with the mounting flange member 34 with an elastomer 26 interposed therebetween. However, for example, it may also be directly overlapped with the mounting flange member 34 and fixed by means such as welding. In addition, the specific structure of the metal helical spring 24 is not limited. For example, a helical spring with unequal pitches may be used, and various end shapes such as a closed end, an open end, and a tangent end may be selectively adopted. Hooks, uprights, etc. may also be provided at the ends for fixing to the mounting flange member, etc.

[0104] The bolt fixing portion of the mounting flange member 34 is not limited to bolt holes. For example, it can also be composed of bolts implanted in the mounting flange member 34.

[0105] Explanation of Reference Numerals

[0106] 10: Vibration damping device unit (first embodiment);

[0107] 12: Support base;

[0108] 14: Vibration damping device (sub-vibration system);

[0109] 16: First beam member;

[0110] 18: Second beam member;

[0111] 20: Mass body member;

[0112] 22: Connecting member;

[0113] 24: Metal helical spring (elastic member);

[0114] 26: Elastomer (elastic member);

[0115] 28: Spring wire;

[0116] 30: Large-diameter portion;

[0117] 31: Central hole;

[0118] 32: Thinned portion;

[0119] 34: Mounting flange member;

[0120] 36: Bolt hole (bolt fixing portion);

[0121] 38: Through hole;

[0122] 40: Ring-shaped fitting;

[0123] 42: Bolt;

[0124] 44: Bolt;

[0125] 50: Connecting member (second embodiment);

[0126] 52: Metal helical spring (elastic member);

[0127] 54: Elastomer (elastic member);

[0128] 60: Connecting member (third embodiment);

[0129] 62: Flange member for installation;

[0130] 64: Bolt hole (bolt fixing portion);

[0131] A: Building structure;

[0132] a: Structural member.

Claims

1. A vibration damping device unit is assembled to a building structure to reduce the vertical vibration in the building structure. Among them, the vibration damping device unit has a support base, and the support base is fixedly installed on a structural member of the building structure as the main vibration system, a plurality of mass body members are elastically connected to the support base through connecting members having spring elements and damping elements respectively, thereby constituting a plurality of sub-vibration systems, a TMD having a plurality of natural vibration frequencies in the vertical direction is constituted by these plurality of sub-vibration systems.

2. The vibration damping device unit according to claim 1, wherein, the mass body member is supported by a plurality of the connecting members, a plurality of the connecting members are all composite structures formed by fixedly connecting a plurality of elastic members made of different materials to each other, a plurality of the elastic members constituting the connecting member each have a length dimension in the vertical direction capable of connecting the mass body member and the support base, the mass body member is directly and elastically supported on the support base by a plurality of the elastic members constituting the connecting member.

3. The vibration damping device unit according to claim 2, wherein, a plurality of the elastic members constituting the connecting member are metal helical springs and elastic bodies, the elastic body is fixedly connected to the spring wire of the metal helical spring so as to cover the entire surface of the spring wire, it is formed into a structure in which the elastic body connects between pitches of the spring wires adjacent in the vertical direction in the metal helical spring.

4. The vibration damping device unit according to claim 3, wherein, The winding diameters of both end portions of the coil axis of the metal helical spring are larger than the winding diameter of the central portion.

5. The vibration damping device unit according to claim 3 or 4, wherein, mounting flange members are provided at both vertical end portions of the connecting member, and the mounting flange members have bolt fixing portions fixed to one of the mass body member and the support base respectively, the elastic body constituting the connecting member is fixedly connected to the mounting flange member.

6. The vibration damping device unit according to claim 5, wherein, In the mounting flange member provided at at least one end of the connecting member, the bolt fixing portion with respect to the mass body member or the support base can adjust the fixing position around an elastic central axis extending in the vertical direction in the connecting member.

7. The vibration damping device unit according to any one of claims 1 to 6, wherein, Each of the mass body members is elastically connected to the support base through a plurality of the connecting members arranged in parallel.

8. The vibration damping device unit according to any one of claims 1 to 7, wherein, the plurality of mass body members are set to have the same mass, the spring characteristics of the connecting members elastically supporting the mass body member are made different among these plurality of mass body members, thereby constituting the plurality of sub-vibration systems having different natural vibration frequencies in the vertical direction.

9. The vibration damping device unit according to claim 8, wherein, the connecting members can be selected from a plurality of types prepared with different spring characteristics, by installing a plurality of the connecting members with the same spring characteristics on each of the mass body members, each of the mass body members is elastically supported by the support base in a state where the mass is evenly supported by the plurality of the connecting members.

10. The vibration damping device unit according to any one of claims 1 to 9, wherein, The damping device unit includes a lateral vibration restricting mechanism that allows relative displacement of the mass body member relative to the support base in the vertical direction and restricts the amount of relative displacement of the mass body member relative to the support base in the horizontal direction.

11. A damping device for damping vertical vibrations in a building structure, wherein the connecting member that elastically supports the mass body member is composed of a composite structure formed by fixing an elastic body to the surface of the spring wire of a metal helical spring so as to cover the entire surface of the spring wire. The elastic body is formed in a hollow structure having a central hole extending in the direction of the spring central axis of the metal helical spring.

12. The vibration damping device according to claim 11, wherein, At least one of the inner peripheral surface and the outer peripheral surface of the elastic body has spiral irregularities extending in the winding direction of the spring wire of the metal helical spring.

13. The vibration damping device according to claim 11 or 12, wherein, A groove-shaped thinning portion is provided in the elastic body, and the thinning portion opens on the inner peripheral surface or the outer peripheral surface between the pitches of the spring wires adjacent in the vertical direction in the metal helical spring.

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