Vibration damping devices for building structures

Abstract

To provide a vibration control device for a building structure having a novel structure which can easily perform a mass adjustment of a sub-mass even if exerting an excellent vibration control action by employing the sub-mass having, in particular, a large mass.SOLUTION: In a vibration control device 10 for a building structure having a main mass 16 which is rectangular in a vertical view, and a plurality of support bodies 14 arranged below the main mass 16, and elastically connecting the main mass 16 to a base member 74, a sub-mass 44 including an additional mass 46 attached to a lower face of the main mass 16 while being superimposed thereon, and an adjustment mass 48 which is lighter than the additional mass 46 in weight, and attached to a lower face of the additional mass 46 while being superimposed thereon is arranged below the main mass 16, the additional mass 46 is bolt-fixed to the main mass 16 with a first bolt 60, and the adjustment mass 48 is detachably attached to the additional mass 46 with a second bolt 70 which is different from the first bolt 60.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a vibration damping device for a building structure installed to suppress vibrations generated by traffic vibrations, wind, etc. in building structures such as hospitals and hotels.

Background Art

[0002] In building structures such as houses, vibrations may occur when external forces such as traffic vibrations and wind act as excitation forces. Therefore, as one means of reducing such vibrations, a vibration damping device for a building structure has been proposed in Japanese Patent Application Laid-Open No. 2003-139191 (Patent Document 1) and the like. The vibration damping device of Patent Document 1 has a structure in which a mass member is elastically supported by rubber mounts, and when an external force such as traffic vibration acts as an excitation force, the mass member vibrates (translates) in a substantially horizontal direction to reduce the excitation force.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in order to effectively obtain the vibration damping effect, a vibration damping device for a building structure requires a mass of the mass member corresponding to the mass of the building structure. Therefore, in a small building structure such as a single-family house, the mass of the mass member required to sufficiently reduce the excitation force is relatively small, and the number of installed vibration damping devices can be reduced. However, in large-scale building structures such as apartment houses, hospitals, and hotels, since the mass of the mass member required to sufficiently reduce the excitation force becomes large, it has been necessary to install a large number of vibration damping devices.

[0005] Therefore, in order to increase the mass of the mass member and reduce the number of vibration damping devices required, a structure is proposed in Patent Document 1 in which a sub-mass (weight) is provided using the space below the main mass supported by a support. The sub-mass in Patent Document 1 is, for example, a structure in which multiple weight members are bolted to the main mass in a stacked state, and it is possible to adjust the mass of the sub-mass by changing the number of stacked weight members.

[0006] However, in Patent Document 1, since multiple weight members are bolted together to the main mass, loosening or removing the bolts to adjust the mass would affect the bolt fastening of all of these weight members, potentially requiring the worker to support the mass of the weight members while working, or causing damage to the remaining bolts due to a large load.

[0007] The problem to be solved by the present invention is to provide a novel vibration damping device for building structures that allows for easy adjustment of the mass of the sub-mass, especially when employing a large sub-mass to achieve excellent vibration damping. [Means for solving the problem]

[0008] The following describes preferred embodiments for understanding the present invention. However, each embodiment described below is illustrative and can be combined with others as appropriate. Furthermore, the multiple components described in each embodiment can be recognized and adopted as independently as possible, and can be combined with any component described in another embodiment as appropriate. Thus, the present invention is not limited to the embodiments described below, and various other embodiments can be realized.

[0009] The first embodiment is a vibration damping device for a building structure comprising a main mass that is rectangular in vertical view, and a plurality of supports positioned below the main mass and elastically connecting the main mass to a base member, wherein a sub-mass is positioned below the main mass, including an additional mass mounted on top of the lower surface of the main mass, and an adjustment mass that is lighter than the additional mass and mounted on top of the lower surface of the additional mass, the additional mass being bolted to the main mass by first bolts, and the adjustment mass being detachably fixed to the additional mass by second bolts different from the first bolts. The main mass is rectangular in plan view, and the support members are arranged on both sides of the main mass in the direction of the longer side, and the adjustment mass is provided with a second insertion hole through which the second bolt is inserted, and the second insertion hole extends in the direction of the shorter side of the main mass. They exist.

[0010] In a vibration damping device for building structures according to this embodiment, since the additional mass, which has a relatively large mass, is fixed to the main mass with a first bolt, the mass of the mass member can be greatly increased by the additional mass, which is fixed to the main mass and cannot be removed. Therefore, the vibration damping effect of the secondary vibration system composed of the vibration damping device is effectively exerted on the building structure that constitutes the main vibration system, thereby improving the vibration state of the building structure. Moreover, since the additional mass is attached by overlapping it with the lower surface of the main mass, which is supported from below by a support, the additional mass can be arranged by effectively utilizing the space between the support, for example.

[0011] Since the adjustment mass, which is lighter than the additional mass, is detachably attached to the additional mass by a second bolt separate from the first bolt, by loosening the second bolt, the adjustment mass can be removed or added while the additional mass remains fixed to the main mass. This allows the mass of the mass members to be adjusted by attaching or detaching only the lightweight adjustment mass, without the need for an operator to support the relatively large additional mass. Therefore, when a large sub-mass is required, the mass of the sub-mass can be secured by the additional mass, while the resonant frequency of the sub-vibration system can be easily tuned by the adjustment mass.

[0012] The second embodiment is a vibration damping device for a building structure as described in the first embodiment, wherein the adjustment mass is fixed to the additional mass at multiple locations by the second bolts, the adjustment mass is provided with a plurality of second insertion holes through which the second bolts are inserted, the second insertion holes are in the shape of straight slits extending parallel to each other, one end of each second insertion hole is an open end that opens to the same side surface of the adjustment mass, and the other end of each second insertion hole is a deep end that does not reach the side surface of the adjustment mass, the additional mass is provided with a plurality of second screw holes through which the second bolts inserted into the second insertion holes are screwed, and both the second insertion holes and the second screw holes are arranged asymmetrically with respect to the center of the adjustment mass.

[0013] According to the vibration damping device for building structures constructed in accordance with this embodiment, the second insertion hole through which the second bolt is inserted is slit-shaped, so that the adjustment mass can be easily attached to and detached from the additional mass by sliding the adjustment mass in the longitudinal direction of the second insertion hole, thereby releasing the second bolt from the second insertion hole through the open end of the second insertion hole or inserting it into the second insertion hole, without completely removing the second bolt from the second screw hole.

[0014] Since one end of each of the multiple second insertion holes is an open end that opens to the same side of the adjustment mass, and the other end is a deep end that does not reach the side of the adjustment mass, the sliding direction of the adjustment mass is defined to one side in the longitudinal direction of the second insertion hole.

[0015] The third aspect is, A vibration damping device for building structures comprising a rectangular main mass in a vertical view, and a plurality of supports positioned below the main mass and elastically connecting the main mass to a base member, wherein a sub-mass is provided below the main mass, including an additional mass mounted superimposed on the lower surface of the main mass, and an adjustment mass that is lighter than the additional mass and mounted superimposed on the lower surface of the additional mass, the additional mass being bolted to the main mass by a first bolt, and the adjustment mass being detachably fixed to the additional mass by a second bolt different from the first bolt, and the adjustment mass being attached to the additional mass The adjustment mass is fixed in multiple places by the second bolts, and the adjustment mass is provided with multiple second insertion holes through which the second bolts are inserted, and the second insertion holes are in the shape of straight slits extending parallel to each other, with one end of each second insertion hole being an open end that opens to the same side surface of the adjustment mass, and the other end of each second insertion hole being a deep end that does not reach the side surface of the adjustment mass, and the additional mass is provided with multiple second screw holes through which the second bolts inserted into the second insertion holes are screwed, and both the second insertion holes and the second screw holes are arranged asymmetrically with respect to the center of the adjustment mass, Additional squares Applicable Multiple locations relative to the main cell Applicable The main mass is bolted in place by a first bolt, and both the first screw hole in the main mass into which the first bolt is screwed and the first insertion hole in the additional mass through which the first bolt is inserted are asymmetrical with respect to the center of the additional mass.

[0016] In a vibration damping device for building structures according to this embodiment, since the additional mass, which has a relatively large mass, is fixed to the main mass with a first bolt, the mass of the mass member can be greatly increased by the additional mass, which is fixed to the main mass and cannot be removed. Therefore, the vibration damping effect of the secondary vibration system composed of the vibration damping device is effectively exerted on the building structure that constitutes the main vibration system, thereby improving the vibration state of the building structure. Moreover, since the additional mass is attached by overlapping it with the lower surface of the main mass, which is supported from below by a support, the additional mass can be arranged by effectively utilizing the space between the support, for example. Since the adjustment mass, which is lighter than the additional mass, is detachably attached to the additional mass by a second bolt separate from the first bolt, by loosening the second bolt, the adjustment mass can be removed or added while the additional mass remains fixed to the main mass. This allows the mass of the mass members to be adjusted by attaching or detaching only the lightweight adjustment mass, without the need for an operator to support the relatively large additional mass. Therefore, when a large sub-mass is required, the mass of the sub-mass can be secured by the additional mass, while the resonant frequency of the sub-vibration system can be easily tuned by the adjustment mass. Furthermore, in a vibration damping device for building structures that conforms to this embodiment, the second insertion hole through which the second bolt is inserted is slit-shaped, so that the adjustment mass can be easily attached to and detached from the additional mass by sliding the adjustment mass in the longitudinal direction of the second insertion hole, thereby releasing the second bolt from the second insertion hole through the open end of the second insertion hole or inserting it into the second insertion hole, without completely removing the second bolt from the second screw hole. Since one end of each of the multiple second insertion holes is an open end that opens to the same side of the adjustment mass, and the other end is a deep end that does not reach the side of the adjustment mass, the sliding direction of the adjustment mass is defined to one side in the longitudinal direction of the second insertion hole. moreover, In a vibration damping device for building structures constructed according to this embodiment, if the additional mass is installed in the wrong orientation relative to the main mass, the installation method of the additional mass relative to the main mass will differ from that when it is installed in the correct orientation, or it may become impossible to install the additional mass relative to the main mass. Therefore, an error in the orientation of the additional mass when installing it to the main mass can be easily detected by visual inspection or other means. In this way, by installing the additional mass in the correct orientation relative to the main mass, it is possible to prevent the sliding direction of the adjustment mass relative to the main mass from being in an unintended direction when attaching or detaching the adjustment mass to the additional mass.

[0017] The fourth aspect is a vibration damping device for a building structure as described in the second or third aspect, wherein the additional mass has a pin that protrudes toward the adjustment mass and is inserted into the second insertion hole, provided on the opening end side of the second insertion hole rather than the second screw hole, and the distance from the pin to the opening end in the longitudinal direction of the second insertion hole is shorter than the distance from the rear end to the side surface of the adjustment mass located on the opposite side of the opening end.

[0018] According to the vibration damping device for building structures constructed in accordance with this embodiment, when the adjustment mass is mounted in a sliding direction opposite to that of the additional mass, the mounting position of the adjustment mass relative to the additional mass is shifted in the longitudinal direction of the second insertion hole due to the contact between the pin inserted into the second insertion hole and the inner end of the second insertion hole. This makes it easy to prevent the adjustment mass from being mounted in the wrong orientation relative to the additional mass through visual inspection or other means.

[0019] The fifth embodiment is a vibration damping device for building structures described in any one of the second to fourth embodiments, wherein the lengths of the plurality of second through holes are different from each other, and at least one of the second screw holes located in the longer second through hole is located further inward than the shorter second through hole.

[0020] According to the vibration damping device for a building structure configured according to this aspect, when the attachment direction of the adjustment mass with respect to the additional mass is not appropriate, the attachment position of the adjustment mass with respect to the additional mass is displaced due to the difference in the length dimensions of the plurality of second insertion holes, so that incorrect assembly can be easily grasped by visual inspection or the like.

[0021] The sixth aspect is the vibration damping device for a building structure according to any one of the second to fifth aspects, wherein the width dimensions of the plurality of second insertion holes are different from each other, and the second screwing holes located on the wider second insertion hole are larger in diameter than the second screwing holes located on the narrower second insertion hole.

[0022] According to the vibration damping device for a building structure configured according to this aspect, when the attachment direction of the adjustment mass with respect to the additional mass is not appropriate, it becomes impossible to fix the bolt due to the difference in the width dimension of the plurality of second insertion holes and the diameter of the second screwing hole, so that incorrect assembly can be easily grasped.

[0023] The seventh aspect is the vibration damping device for a building structure according to any one of the second to sixth aspects, wherein the distances of the plurality of second insertion holes from the center of the adjustment mass are different from each other.

[0024] According to the vibration damping device for a building structure configured according to this aspect, when the attachment direction of the adjustment mass with respect to the additional mass is not appropriate, the attachment position of the adjustment mass with respect to the additional mass is displaced due to the difference in the distances of the plurality of second insertion holes from the center of the adjustment mass, so that incorrect assembly can be easily grasped.

[0025] The eighth aspect is the vibration damping device for a building structure according to any one of the second to seventh aspects, wherein the main mass is rectangular in plan view, the additional mass and the adjustment mass are arranged between the supports in the long side direction of the main mass, both ends of the adjustment mass in the short side direction of the main mass are located between the supports adjacent to each other in the long side direction of the main mass, and the second insertion holes of the adjustment mass extend in the short side direction of the main mass.

[0026] According to the vibration damping device for building structures that conforms to this embodiment, the sub-mass is arranged between the supports in the long-side direction of the main mass, thereby allowing for a larger area to be secured for the arrangement of the sub-mass.

[0027] Because the second insertion hole of the adjustment mass extends in the direction of the short side of the main mass, the sliding direction when attaching or detaching the adjustment mass is in the direction of the short side of the main mass, and the adjustment mass slides between the supports arranged on both sides in the direction of the long side of the main mass, interference between the adjustment mass and the supports is less likely to be a problem when attaching or detaching the adjustment mass. The ninth aspect is a vibration damping device for building structures described in any one of the second to eighth aspects, wherein the orientation of the adjustment mass when attached to the additional mass is uniquely defined in the screwed state of each second bolt into each second screw hole.

[0028] The ten The manner of is, A vibration damping device for building structures comprising a main mass that is rectangular in vertical view, and a plurality of supports positioned below the main mass and elastically connecting the main mass to a base member, wherein a sub-mass is provided below the main mass, including an additional mass mounted on top of the lower surface of the main mass, and an adjustment mass that is lighter than the additional mass and mounted on top of the lower surface of the additional mass, the additional mass being bolted to the main mass by a first bolt, and the adjustment mass being detachably fixed to the additional mass by a second bolt different from the first bolt, The additional spaces are: A first insertion hole is provided through which the first bolt is inserted, The recess that accommodates the head of the first bolt is Applicable It is provided at the opening of the first insertion hole, and the opening of the receiving recess is Applicable It is covered by adjustment shims.

[0029] In a vibration damping device for building structures according to this embodiment, since the additional mass, which has a relatively large mass, is fixed to the main mass with a first bolt, the mass of the mass member can be greatly increased by the additional mass, which is fixed to the main mass and cannot be removed. Therefore, the vibration damping effect of the secondary vibration system composed of the vibration damping device is effectively exerted on the building structure that constitutes the main vibration system, thereby improving the vibration state of the building structure. Moreover, since the additional mass is attached by overlapping it with the lower surface of the main mass, which is supported from below by a support, the additional mass can be arranged by effectively utilizing the space between the support, for example. Since the adjustment mass, which is lighter than the additional mass, is detachably attached to the additional mass by a second bolt separate from the first bolt, by loosening the second bolt, the adjustment mass can be removed or added while the additional mass remains fixed to the main mass. This allows the mass of the mass members to be adjusted by attaching or detaching only the lightweight adjustment mass, without the need for an operator to support the relatively large additional mass. Therefore, when a large sub-mass is required, the mass of the sub-mass can be secured by the additional mass, while the resonant frequency of the sub-vibration system can be easily tuned by the adjustment mass. Also, According to the vibration damping device for building structures constructed in accordance with this embodiment, the head of the first bolt that fixes the additional mass to the main mass is housed in the housing recess, allowing the adjustment mass to extend to the opening of the housing recess, thereby efficiently securing the mass of the adjustment mass. Furthermore, since the additional mass is held in a fixed state relative to the main mass, and the attachment and detachment of the adjustment mass to the additional mass is performed by operating the second bolt, the operation of adjusting the mass of the mass member is not affected even if the opening of the housing recess is covered by the adjustment mass.

[0030] The Eleven The manner of is, A vibration damping device for building structures comprising a rectangular main mass in a vertical view, and a plurality of support members positioned below the main mass and elastically connecting the main mass to a base member, wherein a sub-mass is provided below the main mass, including an additional mass mounted on top of the lower surface of the main mass, and an adjustment mass that is lighter than the additional mass and mounted on top of the lower surface of the additional mass, the additional mass being bolted to the main mass by a first bolt, and the adjustment mass being detachably fixed to the additional mass by a second bolt different from the first bolt, The upper end of the support is connected via a bracket Applicable It is attached to the main mass, and the main mass is provided with a working hole that penetrates vertically above the connection between the support and the bracket.

[0031] In a vibration damping device for building structures according to this embodiment, since the additional mass, which has a relatively large mass, is fixed to the main mass with a first bolt, the mass of the mass member can be greatly increased by the additional mass, which is fixed to the main mass and cannot be removed. Therefore, the vibration damping effect of the secondary vibration system composed of the vibration damping device is effectively exerted on the building structure that constitutes the main vibration system, thereby improving the vibration state of the building structure. Moreover, since the additional mass is attached by overlapping it with the lower surface of the main mass, which is supported from below by a support, the additional mass can be arranged by effectively utilizing the space between the support, for example. Since the adjustment mass, which is lighter than the additional mass, is detachably attached to the additional mass by a second bolt separate from the first bolt, by loosening the second bolt, the adjustment mass can be removed or added while the additional mass remains fixed to the main mass. This allows the mass of the mass members to be adjusted by attaching or detaching only the lightweight adjustment mass, without the need for an operator to support the relatively large additional mass. Therefore, when a large sub-mass is required, the mass of the sub-mass can be secured by the additional mass, while the resonant frequency of the sub-vibration system can be easily tuned by the adjustment mass. Also, According to the vibration damping device for building structures that conforms to this embodiment, the connecting part that connects the support and the mounting bracket can be operated from above through a work hole that penetrates the main mass, making it easy to attach the support to the mounting bracket and adjust the orientation of the support during manufacturing. [Effects of the Invention]

[0032] According to the present invention, even when employing a large sub-mass in a vibration damping device for building structures to achieve excellent vibration damping, the mass of the sub-mass can be easily adjusted. [Brief explanation of the drawing]

[0033] [Figure 1] Front view showing a vibration damping device for building structures as the first embodiment of the present invention. [Figure 2] Plan view of a vibration damping device for building structures shown in Figure 1. [Figure 3] Section III-III in Figure 2 [Figure 4] Plan view of the main mass constituting the vibration damping device for building structures shown in Figure 1. [Figure 5] Plan view of the additional mass constituting the vibration damping device for building structures shown in Figure 1. [Figure 6] Plan view of the adjustment mass constituting the vibration damping device for building structures shown in Figure 1. [Figure 7A] Figure 1 shows a vibration damping device for building structures, illustrating the state in which the adjustment mass is installed in the appropriate orientation relative to the additional mass. [Figure 7B] Figure 1 shows a vibration damping device for building structures, illustrating a situation where the adjustment mass is positioned incorrectly relative to the additional mass. [Figure 7C] Figure 1 shows a vibration damping device for building structures, illustrating a situation where the adjustment mass is positioned incorrectly relative to the additional mass. [Figure 7D]Figure 1 shows a vibration damping device for building structures, illustrating a situation where the adjustment mass is positioned incorrectly relative to the additional mass. [Figure 8] A vibration control structure for building structures, including the vibration control device for building structures shown in Figure 1. [Figure 9A] A bottom view showing a vibration damping device for building structures as a second embodiment of the present invention. [Figure 9B] Figure 9A shows a vibration damping device for building structures, where the adjustment mass is positioned in the wrong orientation relative to the additional mass. [Figure 10A] A bottom view showing a vibration damping device for building structures as a third embodiment of the present invention. [Figure 10B] Figure 10A shows a vibration damping device for building structures, where the adjustment mass is positioned in the wrong orientation relative to the additional mass. [Modes for carrying out the invention]

[0034] Embodiments of the present invention will be described below with reference to the drawings.

[0035] Figures 1 to 3 show a vibration damping device 10 for building structures (hereinafter referred to as the vibration damping device) having a structure according to the present invention. The vibration damping device 10 has a structure in which a rubber mount 14 as a support is attached to a mass member 12. In the following description, as a general rule, the vertical direction refers to the vertical direction in Figure 1, which is the vertical height direction; the front-rear direction refers to the vertical direction in Figure 2, which is the direction of the shorter side of the main mass 16 described later; and the left-right direction refers to the left-right direction in Figure 1, which is the direction of the longer side of the main mass 16.

[0036] The mass member 12 is composed of a main mass 16. The main mass 16 is preferably made of metal or a high-density material containing metal. The main mass 16 is a rectangular parallelepiped, with a short side direction (front-to-back direction) and a long side direction (left-to-right direction) when viewed from above. As shown in Figure 4, the main mass 16 has multiple holes that penetrate it vertically for purposes such as attaching other members and improving workability during manufacturing. Specifically, for example, a pair of bracket mounting holes 18, 18 are formed at each of the four corners of the main mass 16, and a work hole 20 is formed between the pair of bracket mounting holes 18, 18.

[0037] Furthermore, four first screw holes 22,22,22,22 are formed in the middle portion of the main mass 16 in the longitudinal direction. Three of these four first screw holes 22,22,22,22 are located at the corners of a virtual rectangle S centered on the center G1 of the main mass 16, while one, located to the front right, is off-corner of the virtual rectangle S. The first screw hole 22 positioned off-corner of the virtual rectangle S is positioned asymmetrically to the other three first screw holes 22,22,22, in terms of rotational symmetry of 180 degrees around the vertical axis, front-to-back axis, and left-to-right axis passing through the center of the virtual rectangle S (center G2 of the additional mass 46, described later). In short, the first screw hole 22 positioned off-corner of the virtual rectangle S is positioned so that a 180-degree rotation around the vertical axis, front-to-back axis, and left-to-right axis passing through the center of the virtual rectangle S does not move it to the position of the other first screw holes 22,22,22 before rotation. Furthermore, the inner circumferential surface of the first screw hole 22 has threads formed thereon that engage with the first bolt 60, which will be described later.

[0038] The main mass 16 is supported at the lower corners by rubber mounts 14 acting as supports. The structure of the rubber mounts 14 is not particularly limited, but in this embodiment, as shown in Figure 1, it has a laminated structure in which a plurality of plate members 24 stacked at predetermined intervals are elastically connected to each other by rubber elastic bodies 26. The plate members 24 are rectangular plates when viewed in the vertical direction, and rubber elastic bodies 26 are fixed to both ends in the direction of the long side. The rubber elastic bodies 26 are rectangular blocks extending in the direction of the short side of the plate members 24, and are arranged between opposing plate members 24, 24 in the vertical direction. Each rubber elastic body 26 is continuous with each other through through holes (not shown) formed in the plate members 24, and is also continuous with each other by the covering rubber that covers the surface of the plate members 24, so that a plurality of rubber elastic bodies 26 are integrally formed. In Figures 1 and 3, for ease of viewing, the plate members covered with the covering rubber are denoted by reference numeral 24.

[0039] The opposite sides (both ends) of the plate member 24 to which the rubber elastic body 26 is fixed are inclined portions 28 that slope upward toward the outside in the direction of the long side. This allows the support load shared by the mass member 12 to be received as a compressive force acting on the rubber elastic body 26, and also increases the difference in spring characteristics between the long and short sides of the plate member 24. By adjusting the orientation of the rubber mount 14, the resonant frequency of the mass-spring resonant system, described later, can be adjusted with a greater degree of freedom.

[0040] The rubber mount 14 is fixed to the main mass 16 via a bracket 32, which is a mounting fitting, through a first mounting member 30 located at its upper end. The bracket 32 ​​has a structure in which flange-shaped mounting pieces 36 extend outward in the groove width direction from the upper ends of both side walls of a groove-shaped portion 34 that extends in a substantially rectangular cross-section. Mounting bolts 37 inserted through bolt holes in the mounting pieces 36, 36 are screwed into bracket mounting holes 18 of the main mass 16, thereby fixing the bracket 32 ​​to the main mass 16. An upper fastening bolt 38 protruding upward from the first mounting member 30 is inserted through the bottom wall portion of the groove-shaped portion 34 of the bracket 32, and a nut 40 is screwed onto the upper fastening bolt 38 to form a connecting portion, thereby fixing the rubber mount 14 to the bracket 32. The nut 40 is positioned relative to the working hole 20 of the main mass 16 and can be loosened or tightened by a tool inserted into the working hole 20 from above.

[0041] Furthermore, a second mounting member 42 is provided at the lower end of the rubber mount 14, and a lower fastening bolt 43 that protrudes downward is provided on the second mounting member 42.

[0042] A sub-mass 44, which has a smaller mass than the main mass 16, is attached to the main mass 16, and the mass member 12 of this embodiment is composed of the main mass 16 and the sub-mass 44. The sub-mass 44 is positioned below the main mass 16 and is positioned inward in the left-right direction relative to the rubber mount 14. The front and rear ends of the sub-mass 44 are located between the left-right directions of the adjacent rubber mounts 14, 14, and overlap with the rubber mount 14 in the left-right projection. The sub-mass 44 includes an additional mass 46 attached to the lower surface of the main mass 16 and an adjustment mass 48 attached to the lower surface of the additional mass 46.

[0043] The additional mass 46 is preferably made of a high-density material, similar to the main mass 16, and is in the shape of a rectangular parallelepiped or cube. In this embodiment, it is in the shape of a thick, approximately rectangular plate. The size of the additional mass 46 in plan view is smaller than that of the main mass 16. In this embodiment, as shown in Figure 2, the length in the front-to-back direction is approximately the same as that of the main mass 16, while the length in the left-to-right direction is smaller than that of the main mass 16. The additional mass 46 is positioned between the rubber mounts 14 in the left-to-right direction and is spaced inward from the rubber mounts 14 in the left-to-right direction.

[0044] As shown in Figure 5, the additional mass 46 has four first through holes 50, 50, 50, 50. The first through holes 50 are circular holes that penetrate the additional mass 46 in the vertical direction and are formed in a shape and position corresponding to the first screw holes 22 of the main mass 16. In addition, a accommodating recess 52 is formed around the lower opening of the first through holes 50 in the additional mass 46. The accommodating recess 52 is a recess with a larger diameter circular cross-section than the first through holes 50, and the lower opening of the first through holes 50 opens to the bottom surface of the accommodating recess 52.

[0045] The additional mass 46 has three second screw holes 54, 54, 54 formed therein. Specifically, one second screw hole 54a is provided at a position to the left of the center G2 of the additional mass 46, and two second screw holes 54b, 54b are provided at a position to the right of the additional mass 46, and these two second screw holes 54b, 54b are located side by side, separated by a predetermined distance in the front-to-back direction. The second screw hole 54a is provided in the central part of the additional mass 46 in the front-to-back direction, and the second screw holes 54b, 54b are provided at positions approximately the same distance to one side of the central part of the additional mass 46, in the front and back directions. In this way, the three second screw holes 54a, 54b, 54b are arranged asymmetrically so as not to be 180 degrees rotationally symmetric with respect to the vertical axis passing through the center G2 of the additional mass 46. Furthermore, the three second screw holes 54a, 54b, and 54b are arranged asymmetrically so as not to be 180 degrees rotationally symmetric with respect to the front-to-back axis passing through the center G2 of the additional mass 46.

[0046] The additional mass 46 is provided with a pin 56. The pin 56 is a rod-shaped structure with a circular cross-section extending vertically. As shown in Figure 3, the upper part of the pin 56 is press-fitted into a pin fixing hole 58 formed in the additional mass 46, and the lower part protrudes downward from the additional mass 46. The pin 56 is positioned further back than the two second screw holes 54b, 54b which are aligned in the front-to-back direction. In this embodiment, the lower part of the pin 56 that protrudes from the additional mass 46 has a larger diameter than the upper part, but the lower and upper parts may have approximately the same diameter, or the lower part may have a smaller diameter than the upper part. Also, although the pin 56 is a separate component from the additional mass 46, it may be integrally provided with the additional mass 46 and be a projection that protrudes downward.

[0047] The additional mass 46 is superimposed on the lower surface of the main mass 16 and is attached to the main mass 16 with first bolts 60. The first bolts 60 are inserted through the first insertion holes 50 of the additional mass 46 and then screwed into the first threaded holes 22 that penetrate the main mass 16 vertically, thereby bolting the additional mass 46 to the main mass 16. In this embodiment, the additional mass 46 is bolted to the main mass 16 at four points by four first bolts 60, 60, 60, 60. The heads 62 of the first bolts 60 are housed in the housing recesses 52 of the additional mass 46 and do not protrude downward from the lower surface of the additional mass 46. The housing recesses 52 have a diameter that allows a tool for rotating the heads 62 of the first bolts 60 to be inserted, and a gap is provided between the inner surface of the peripheral wall of the housing recesses 52 and the outer surface of the heads 62 of the first bolts 60.

[0048] When fixing the additional mass 46 to the main mass 16, one first screw hole 22 and one first insertion hole 50 are positioned asymmetrically with respect to the other three. Therefore, when the first bolts 60, 60, 60, 60 inserted through the first insertion holes 50, 50, 50, 50 are screwed into the first screw holes 22, 22, 22, 22, the orientation of the additional mass 46 relative to the main mass 16 is uniquely determined. In other words, if an attempt is made to attach the additional mass 46 to the main mass 16 in a direction other than the appropriate mounting direction shown in Figure 2, it will be impossible to screw the first bolt 60 into at least one of the first screw holes 22. Thus, the additional mass 46 can only be attached in the appropriate orientation relative to the main mass 16.

[0049] An adjustment mass 48 is attached to the additional mass 46. The adjustment mass 48 is a roughly rectangular plate-shaped member with a smaller mass than the additional mass 46, and, like the main mass 16 and the additional mass 46, is preferably made of a metal material with a high specific gravity such as iron. As shown in Figure 2, the adjustment mass 48 has an outer shape that is roughly corresponding to the additional mass 46 when viewed in the vertical direction, and its length in the front-to-back direction is roughly the same as the additional mass 46, while its length in the left-to-right direction is slightly smaller than that of the additional mass 46. The thickness dimension of the adjustment mass 48 in the vertical direction is smaller than that of the additional mass 46. In this embodiment, a structure in which six adjustment masses 48 are provided is illustrated, but the total thickness dimension of these adjustment masses 48 is smaller than the thickness dimension of the additional mass 46. As will be described later, the adjustment mass 48 is attached and detached even after the vibration damping device 10 is installed in the building structure, so the four corners are chamfered to take into consideration safety during work.

[0050] As shown in Figure 6, the adjustment mass 48 is provided with a second insertion hole 64. The second insertion hole 64 penetrates vertically and is a slit shape that extends linearly in the front-rear direction. One end of the second insertion hole 64 in the front-rear direction is an open end 66 that reaches the side (rear) of the adjustment mass 48 and opens to the side, while the other end in the front-rear direction is a deep end 68 that does not reach the side (front) of the adjustment mass 48. The inner surface of the wall of the deep end 68 is preferably a roughly semicircular shape as shown in Figure 6, but it may also be a plane that extends perpendicular to the front-rear direction, for example, and its shape is not limited.

[0051] The adjustment mass 48 has two second insertion holes 64a and 64b with mutually different lengths. The length of the shorter second insertion hole 64a is preferably at least half the length of the adjustment mass 48 in the front-to-back direction. The distances of the second insertion holes 64a and 64b from the center G3 of the adjustment mass 48 in the left-to-right direction are approximately the same. Both second insertion holes 64a and 64b have an open end 66 at the rear and a deep end 68 at the front, with the open ends 66, 66 opening to the same side (rear) of the adjustment mass 48.

[0052] The second insertion holes 64a and 64b are open-ended through-slits with an open end 66 and a deep end 68. Because their lengths in the front-to-back direction are different, they are not 180-degree rotationally symmetrical with respect to the vertical axis, front-to-back axis, and left-to-right axis passing through the center G3 of the adjustment mass 48, and are asymmetrical with respect to all axes.

[0053] The adjustment mass 48 is superimposed on the lower surface of the additional mass 46 and is attached to the additional mass 46 by a second bolt 70, separate from the first bolt 60. The adjustment mass 48 is bolted to the additional mass 46 by screwing the second bolt 70 into the second insertion hole 64 of the adjustment mass 48 and then into the second screw hole 54 that penetrates the additional mass 46 vertically.

[0054] The adjustment mass 48 has left and right ends that reach above the housing recess 52 of the additional mass 46, and the opening of the housing recess 52 is covered by the adjustment mass 48. The head 62 of the first bolt 60 is housed in the housing without protruding downward from the housing recess 52, and therefore does not interfere with the adjustment mass 48. This structure allows for a larger vertical viewing area of ​​the adjustment mass 48, enabling efficient mass management even with a thin-walled adjustment mass 48. Since the mass of the sub-mass 44 is adjusted by attaching and detaching the adjustment mass 48, the additional mass 46 is not intended to be removed from the main mass 16, and it is not a problem if the housing recess 52 where the head 62 of the first bolt 60 is housed is covered by the adjustment mass 48, making it difficult to operate the first bolt 60. Furthermore, because the head 62 of the first bolt 60 is covered by the adjustment mass 48, it is possible to prevent accidental operation of the first bolt 60 when, for example, attaching or detaching the adjustment mass 48.

[0055] The adjustment mass 48 is positioned inward in the left-right direction relative to the rubber mount 14 by being attached to the additional mass 46, and in particular, both ends in the front-rear direction are located between the left and right rubber mounts 14, 14. Therefore, the adjustment mass 48 does not overlap with the rubber mount 14 in the front-rear projection, but it overlaps with the rubber mount 14 in the left-right projection. This prevents interference (contact) between the adjustment mass 48 and the rubber mount 14 when, for example, the adjustment mass 48 is slid forward relative to the additional mass 46 while the second bolt 70 is moved relative to the second insertion hole 64.

[0056] The adjustment mass 48 is bolted in a detachable manner so that it can be removed from the additional mass 46 or added to the additional mass 46 by loosening the second bolt 70 or releasing the screw from the second screw hole 54. The head of the second bolt 70 protrudes below the lower surface of the adjustment mass 48, making it easier to loosen or tighten the second bolt 70. The number of adjustment masses 48 is not particularly limited, but in this embodiment there are six. The mass of each adjustment mass 48 is not particularly limited as long as it is lighter than the additional mass 46. Preferably, the sum of the masses of the adjustment masses 48 is less than the mass of the additional mass 46.

[0057] The adjustment mass 48 has a second insertion hole 64 that is shaped like a straight slit extending in the front-rear direction and has an opening end 66 that opens toward the rear, so that it can be attached to and detached from the additional mass 46 without removing the second bolt 70 from the second screw hole 54. That is, with the second bolt 70 loosened, if the adjustment mass 48 is inserted from front to rear between the head of the second bolt 70 and the additional mass 46, the second bolt 70, which is pre-screwed into the second screw hole 54, can be inserted into the second insertion hole 64 from the opening end 66, and the added adjustment mass 48 can be fixed to the additional mass 46 by tightening the second bolt 70. Alternatively, with the second bolt 70 loosened, if the adjustment mass 48 is moved forward, the second bolt 70, which is still screwed into the second screw hole 54, can be detached from the second insertion hole 64 through the opening end 66, and the adjustment mass 48 can be removed from the additional mass 46.

[0058] The adjustment mass 48 is fixed to the additional mass 46 at multiple points by multiple second bolts 70. In this embodiment, the adjustment mass 48 is attached to the additional mass 46 by three second bolts 70, 70, 70. One of the three second bolts 70, 70, 70 is inserted through the shorter second insertion hole 64a, and the other two are inserted through the longer second insertion hole 64b at two points in the longitudinal direction (front-to-back direction). The second bolts 70, 70 screwed into the second threaded holes 54b, 54b are located on the open end 66 side (rear side) and the inner end 68 side of the second threaded hole 54a, respectively, with the second threaded hole 54b (second bolt 70) on the inner end 68 side being located in front of the inner end 68 of the second insertion hole 64a. The second bolt 70, screwed into the second screw hole 54a, is inserted through the inner end 68 of the second insertion hole 64a, and the contact between the second bolt 70 and the inner end 68 defines the front-to-back position of the adjustment mass 48 relative to the additional mass 46. Note that the number and arrangement of the second bolts 70 are examples and can be increased or decreased as appropriate considering the shape (weight balance) and weight of the adjustment mass 48.

[0059] The two second through holes 64a, 64b and the three second screw holes 54a, 54b, 54b are all asymmetrically shaped or arranged, not being 180 degrees rotationally symmetrical with respect to the vertical axis and the front-to-back axis passing through the center G3 of the adjustment mass 48. Furthermore, the second through holes 64a, 64b are also asymmetrically shaped, not being 180 degrees rotationally symmetrical with respect to the left-to-right axis passing through the center G3 of the adjustment mass 48.

[0060] A rectangular plate-shaped washer 72 is placed between the head 62 of the second bolt 70 and the adjustment mass 48, thereby distributing the tightening force by enlarging the seating surface.

[0061] Furthermore, the pin 56 protruding downward from the additional mass 46 is inserted through the longer second insertion hole 64b. The pin 56 is inserted into the second insertion hole 64b on the side of the opening end 66 of the second insertion hole 64b, 54b. The distance D1 from the pin 56 to the opening end 66 of the second insertion hole 64b (the rear end of the adjustment mass 48) is shorter than the distance D2 from the rear end 68 of the second insertion hole 64b to the front end of the adjustment mass 48. Note that the distance D1 from the pin 56 to the opening end 66 of the second insertion hole 64b is shorter than the distance D3 from the rear end 68 of the shorter second insertion hole 64a to the front end of the adjustment mass 48.

[0062] As shown in Figure 7, the adjustment mass 48 has a defined orientation relative to the additional mass 46 and is installed in the appropriate orientation. Figure 7A shows the adjustment mass 48 installed in the appropriate orientation relative to the additional mass 46. As shown in Figure 7A, the state in which the adjustment mass 48 is installed in the appropriate orientation relative to the additional mass 46 is when the opening end 66 of the second insertion hole 64 is located at the rear and the shorter second insertion hole 64a is located to the left of the longer second insertion hole 64b. Note that in Figure 7, the rubber mount 14 is omitted from the illustration for clarity.

[0063] Figure 7B shows the case where the adjustment mass 48 is installed with its left and right sides reversed. In this case, the front part of the adjustment mass 48 protrudes forward relative to the additional mass 46 and the main mass 16 due to the contact between the rear end 68 of the shorter second insertion hole 64a and the second bolt 70. Therefore, it can be easily determined by visual inspection that the adjustment mass 48 is not installed in the correct orientation relative to the additional mass 46. Furthermore, in Figure 7B, if the second bolt 70 is not pre-screwed into the second screw hole 54, the adjustment mass 48 covers the second screw hole 54b located on the rear end 68 side, making it impossible to screw the second bolt 70 into the second screw hole 54b on the rear end 68 side, thus indicating that the orientation of the adjustment mass 48 is incorrect.

[0064] Figure 7C shows the case where the adjustment mass 48 is installed upside down. In this case, the rear of the adjustment mass 48 protrudes backward relative to the additional mass 46 and the main mass 16 due to the contact between the rear end 68 of the longer second insertion hole 64b and the pin 56. Therefore, it can be easily determined by visual inspection or other means that the adjustment mass 48 is not installed in the correct orientation relative to the additional mass 46.

[0065] Figure 7D shows the case where the adjustment mass 48 is to be mounted in an orientation rotated 180 degrees around the vertical axis as the center of rotation. In this case, the rear of the adjustment mass 48 protrudes backward relative to the additional mass 46 and the main mass 16 due to the contact between the inner end 68 of the shorter second insertion hole 64a and the pin 56. Therefore, it can be easily determined by visual inspection or other means that the adjustment mass 48 is not mounted in the correct orientation relative to the additional mass 46.

[0066] As described above, in the vibration damping device 10 of this embodiment, the difference in length of the second insertion holes 64a and 64b formed in the adjustment mass 48 and the pin 56 provided in the additional mass 46 uniquely define the orientation of the adjustment mass 48 when it is attached to the additional mass 46, thus easily preventing assembly in the wrong orientation.

[0067] As shown in Figure 8, the vibration damping device 10, having the structure described above, is attached to the base member 74 by a second mounting member 42 located at the lower end of the rubber mount 14, which is fixed to the base member 74 by a lower fastening bolt 43, thereby forming a vibration damping structure 76 for building structures. The mass member 12 is elastically supported on the base member 74 by the rubber mount 14, so that the vibration damping device 10 forms a secondary vibration system (mass-spring resonance system) on the base member 74 in the vibration damping structure 76. The two vibration damping devices 10, 10 that make up the vibration damping structure 76 are oriented such that one is rotated 180 degrees around the vertical axis relative to the other.

[0068] The base member 74 is constructed, for example, by combining multiple H-shaped steel beams in a rectangular frame shape. The second mounting member 42, provided at the lower end of the rubber mount 14, is fixed to the base member 74 using a bolt-nut structure. In this embodiment, the base member 74 is a separate member from the building structure to which it is attached, but it may also be part of the building structure, such as a ceiling beam.

[0069] The vibration damping structure 76 is installed in the ceiling space of the building structure, thereby imparting a secondary vibration system, which consists of the vibration damping device 10, to the building structure, which is the main vibration system. Specifically, the base member 74 is fixed to the building structure, such as beams, in the ceiling space of the building structure, and the vibration damping device 10, which is mounted above the base member 74, is attached to the building structure in the ceiling space via the base member 74.

[0070] The vibration damping structure 76 is positioned on a maintenance hatch 78 provided in the ceiling. In Figure 8, the opening position of the maintenance hatch 78 is virtually shown by a dashed line. The maintenance hatch 78 is located adjacent to the two vibration damping devices 10, 10, and it is desirable that its width dimension in the left-right direction is larger than the left-right width dimension of the adjustment mass 48.

[0071] The vibration damping device 10 is oriented such that the rear end 68 of the second insertion hole 64 in the adjustment mass 48 faces the maintenance hatch 78. In short, the vibration damping device 10 is attached to the base member 74 of the vibration damping structure 76 with its inner side in the front-rear direction facing the rear end 68 of the second insertion hole 64. Therefore, in the two vibration damping devices 10, 10 constituting the vibration damping structure 76, the opening end 66 of the second insertion hole 64 is open towards the front in one device and towards the rear in the other device.

[0072] By setting the orientation of the open end 66 and the inner end 68 of the second insertion hole 64 with respect to the maintenance hatch 78 as described above, the adjustment mass 48 can be easily attached and detached through the maintenance hatch 78 when the vibration damping device 10 is installed in the ceiling space of a building structure. That is, after loosening the second bolt 70 through the maintenance hatch 78, the adjustment mass 48 can be slid toward the maintenance hatch 78, thereby detaching the second bolt 70 from the second insertion hole 64 through the open end 66 and removing it. After removing the adjustment mass 48, the number of adjustment masses 48 constituting the sub-mass 44 can be reduced by tightening the second bolt 70, thereby reducing the total mass of the sub-mass 44. Alternatively, with the second bolt 70 loosened, an additional adjustment mass 48 can be inserted between the head 62 of the second bolt 70 and the additional mass 46 or the lower end adjustment mass 48, and the second bolt 70 can be inserted into the second insertion hole 64 through the open end 66. Then, by stacking the additional adjustment mass 48 below the additional mass 46 or adjustment mass 48 and tightening the second bolt 70 to secure it, the number of adjustment masses 48 constituting the sub-mass 44 can be increased, thereby increasing the total mass of the sub-mass 44.

[0073] In this way, by setting the opening end 66 of the second insertion hole 64 in the adjustment mass 48 on the opposite side from the maintenance hatch 78, the adjustment mass 48 can be easily attached to and detached through the maintenance hatch 78 by sliding the adjustment mass 48.

[0074] According to the structure of this embodiment, even when attaching or detaching the adjustment mass 48 through the maintenance hatch 78, incorrect mounting of the adjustment mass 48 to the additional mass 46 is prevented, as explained with reference to Figure 7.

[0075] Furthermore, as shown in Figure 8, the brackets 32 connecting the main mass 16 and the rubber mount 14 are attached to the main mass 16 such that the groove length direction of the groove-shaped portion 34 extends toward the maintenance hatch 78. In this embodiment, each bracket 32 ​​is provided at approximately the same inclination angle with respect to the left-right direction.

[0076] Since the mounting orientation of the bracket 32 ​​to the main mass 16 is set so that the opening in the groove length direction of the groove-shaped portion 34 faces the maintenance hatch 78 side, the nut 40 that fastens the first mounting member 30 of the rubber mount 14 to the bracket 32 ​​can be easily loosened or tightened by a tool inserted into the groove-shaped portion 34 from the side facing the maintenance hatch 78. Therefore, for example, it is easy to change the orientation of the rubber mount 14 around its vertical axis, and it is easy to adjust the vibration damping characteristics by changing the orientation of the rubber mount 14. In this embodiment, the brackets 32, 32, 32, 32 fixed to the four corners of the main mass 16 are oriented in approximately the same direction, but for example, the orientation of the brackets 32, 32 on the inside in the front-rear direction closer to the maintenance hatch 78 and the brackets 32, 32 on the outside in the front-rear direction further from the maintenance hatch 78 may be made different so that the groove-shaped portion 34 of each bracket 32 ​​all open toward the center of the maintenance hatch 78.

[0077] The orientation of the rubber mount 14 is not determined by the orientation of the bracket 32, but is set appropriately according to the desired vibration damping characteristics. In this embodiment, the orientation (angle of inclination with respect to the left-right direction) of the rubber mount 14 is different for the two vibration damping devices 10, 10 that constitute the vibration damping structure 76. As a result, the tuning of the secondary vibration systems of the two vibration damping devices 10, 10 with respect to horizontal input is different for each other, and the frequency range of input vibrations (vibrations to be damped) for which an effective vibration damping effect is exerted is different for each other, so that the vibration damping structure 76 exhibits an effective vibration damping effect for vibrations in a wider frequency range. However, it is also conceivable to tune the characteristics so that a better vibration damping effect is exerted for vibrations in a specific frequency range by making the tuning frequencies of the respective secondary vibration systems that constitute the two vibration damping devices 10, 10 that constitute the vibration damping structure 76 the same for each other.

[0078] Figure 9A shows a vibration damping device 80 for building structures as a second embodiment of the present invention. The vibration damping device 80 has a structure in which an adjustment mass 82 is superimposed on the lower surface of an additional mass 46. In the following description, components and parts that are substantially the same as those in the first embodiment will be denoted by the same reference numerals in the figures, and their descriptions will be omitted.

[0079] The adjustment mass 82 has two second through holes 84a and 84b with different width dimensions, with the second through hole 84b being wider than the second through hole 84a. Because the two second through holes 84a and 84b have different width dimensions, the second screw hole 54 formed in the additional mass 46 has a larger diameter for the second screw hole 54b corresponding to the second through hole 84b than for the second screw hole 54a located at the position corresponding to the second through hole 84a. Therefore, the second bolt screwed into the second screw hole 54b has a larger diameter than the second bolt screwed into the second screw hole 54a.

[0080] In a vibration damping device 80 with this structure, when the adjustment mass 82 is attached to the additional mass 46 in the appropriate orientation shown in Figure 9A, the large-diameter second screw hole 54b opens downward through the wide second insertion hole 84b, and the second bolt inserted through the second insertion hole 84b can be screwed into the second screw hole 54b. Therefore, the adjustment mass 82 can be attached to the additional mass 46 by screwing the second bolt into the second screw holes 54a and 54b.

[0081] On the other hand, as shown in Figure 9B, if the adjustment mass 82 is to be attached to the additional mass 46 with its orientation reversed left and right, the narrow second insertion hole 84a will cover part of the larger diameter second screw hole 54b, making it impossible to screw the second bolt inserted through the second insertion hole 84a into the second screw hole 54b. Furthermore, if a second bolt is already screwed into each second screw hole 54, the larger diameter second bolt screwed into the second screw hole 54b will come into contact with the opening end 66 of the narrow second insertion hole 84a, preventing insertion into the second insertion hole 84a. This indicates that the adjustment mass 82 is not oriented correctly. Note that, as in Figure 7, the rubber mount 14 is not shown in Figure 9B.

[0082] Furthermore, if an attempt is made to attach the adjustment mass 82 to the additional mass 46 while it is inverted or rotated 180 degrees around its vertical axis, the misalignment of the adjustment mass 82 (protrusion from the additional mass 46) due to contact between the pin 56 and the inner end 68 makes it easy to detect incorrect assembly, similar to the first embodiment.

[0083] Thus, with the structure of this embodiment, it is easy to attach the adjustment mass 82 to the additional mass 46 in the appropriate orientation.

[0084] Figure 10A shows a vibration damping device 90 for building structures as a third embodiment of the present invention. The vibration damping device 90 has a structure in which an adjustment mass 92 is attached to an additional mass 46.

[0085] The adjustment mass 92 is provided with two second insertion holes 94a and 94b. The two second insertion holes 94a and 94b are the same shape, and their length in the front-to-back direction and width in the left-to-right direction are also the same. The distances of the two second insertion holes 94a and 94b from the center G3 of the adjustment mass 92 are different. In this embodiment, one second insertion hole 94a is located approximately in the left-to-right center of the adjustment mass 92, and the other second insertion hole 94b is located approximately parallel to the second insertion hole 94a at a position to the left of the second insertion hole 94a, so that the left-to-right separation distances from the center G3 of the adjustment mass 92 are different.

[0086] In the vibration damping device 90 of this embodiment, with the adjustment mass 92 shown in Figure 10A mounted in the correct orientation, the three second screw holes 54, 54, 54 are positioned relative to the two second insertion holes 94a, 94b, and the pin 56 provided in the additional mass 46 is inserted into the second insertion hole 94b. The adjustment mass 92 is then attached to the additional mass 46 by screwing the second bolts inserted through the second insertion holes 94a, 94b into the three second screw holes 54, 54, 54, respectively.

[0087] On the other hand, as shown in Figure 10B, if the adjustment mass 92 is to be attached to the additional mass 46 in a reversed orientation, the second screw holes 54b, 54b, which should be positioned relative to the second insertion hole 94b, are covered by the adjustment mass 92, making it impossible to screw the second bolts into those second screw holes 54b, 54b. Also, if the second bolts are already screwed into each of the second screw holes 54, the second bolts screwed into the second screw holes 54b, 54b will come into contact with the rear surface of the adjustment mass 92, making it impossible to position the adjustment mass 92 in the correct location, and thus it can be determined that the adjustment mass 92 is not in the correct orientation. Note that, as with Figure 7, the rubber mount 14 is not shown in Figure 10B.

[0088] Furthermore, since the pin 56 that should be inserted into the second insertion hole 94b abuts against the front surface of the adjustment mass 92, causing the adjustment mass 92 to protrude rearward relative to the additional mass 46 and the main mass 16, it is easily possible to determine, by visual inspection or other means, that the orientation of the adjustment mass 92 is incorrect.

[0089] Furthermore, if an attempt is made to attach the adjustment mass 92 to the additional mass 46 while it is upside down or rotated 180 degrees around its vertical axis, the misalignment of the adjustment mass 92 (protrusion from the additional mass 46) due to contact between the pin 56 and the rear end 68 or the rear surface of the adjustment mass 92 makes it easy to detect incorrect assembly.

[0090] Thus, with the structure of this embodiment, it is easy to attach the adjustment mass 92 to the additional mass 46 in the appropriate orientation.

[0091] Although embodiments of the present invention have been described in detail above, the present invention is not limited by its specific description. For example, the main mass may be approximately square when viewed in the vertical direction. The sub-mass may be a rectangle with clearly defined long and short sides when viewed in the vertical direction. Furthermore, the main mass and sub-mass are not necessarily limited to metal, nor are they limited to high-density materials. For example, other materials can be selected considering moldability, workability, cost, etc. They can also be formed from concrete or resin, which have a lower specific gravity than metal, or from composite materials containing these materials.

[0092] The second insertion hole is preferably slit-shaped to allow the adjustment mass to be attached and detached by sliding, but it may also be a spot-type through hole, for example. Furthermore, when a slit-shaped second insertion hole is used, it may extend inclined with respect to the front-rear direction or extend with a gentle curve.

[0093] There may be three or more second insertion holes. Even if the three or more second insertion holes are slit-shaped, each second insertion hole extends linearly to open on the same side of the adjustment mass, allowing the adjustment mass to be attached and detached by sliding.

[0094] The adjustment mass is preferably fixed to the additional mass at multiple points by a second bolt, but the number of fixing points for the adjustment mass to the additional mass may be two or four or more.

[0095] The number of adjustment masses is not particularly limited, and the mass of the sub-mass is adjusted by the number of adjustment masses. Furthermore, when multiple adjustment masses are provided, they do not all need to be the same shape or weight. For example, it is possible to use a combination of two types of adjustment masses with different weights to allow for more precise adjustment of the sub-mass's weight.

[0096] The specific structure of the support that elastically connects the main mass and the base member is not limited to the structure of the rubber mount shown in the above embodiment. Furthermore, the support does not necessarily have to be located at the four corners of the main mass when viewed in the vertical direction; for example, one support may be located on each side, or two support may be located on one side and one support on the other.

[0097] It is preferable that the sub-mass does not protrude outward from the main mass when viewed in the vertical direction, but it may be provided protruding from the main mass on one or both sides in the direction of the short side of the main mass, for example.

[0098] The recess for housing the additional mass is not mandatory, and the head of the first bolt may protrude from the underside of the additional mass. In this case, the adjustment mass is provided in a position that avoids the head of the first bolt, for example, between the left and right sides of the first bolt.

[0099] The pin protruding from the lower surface of the additional mass can be fixed to the additional mass by various known fixing structures, such as press-fitting, screw fixing, adhesive bonding, or welding. The pin may be removable from the additional mass; for example, the pin may be removed from the additional mass after the adjustment mass has been fixed to the additional mass.

[0100] The pin protruding from the underside of the additional mass is not mandatory; the mounting direction of the adjustment mass to the additional mass may be uniquely determined by a structure other than the pin.

[0101] The vibration damping structure is not limited to being composed of two vibration damping devices; for example, it may be composed of one vibration damping device, or it may be composed of three or more vibration damping devices attached to a single base member. Furthermore, the present invention originally includes all of the inventions described in (i) to (x) below, and its structure and effects are noted below. The present invention (i) A vibration damping device for a building structure comprising a main mass that is rectangular in vertical view, and a plurality of supports positioned below the main mass and elastically connecting the main mass to a base member, wherein a sub-mass is positioned below the main mass, including an additional mass mounted on top of the lower surface of the main mass, and an adjustment mass that is lighter than the additional mass and mounted on top of the lower surface of the additional mass, wherein the additional mass is bolted to the main mass by a first bolt, and the adjustment mass is detachably fixed to the additional mass by a second bolt different from the first bolt, (ii) The adjustment mass is fixed to the additional mass at multiple locations by the second bolts, the adjustment mass is provided with a plurality of second insertion holes through which the second bolts are inserted, the second insertion holes are in the shape of straight slits extending parallel to each other, one end of each second insertion hole is an open end that opens to the same side surface of the adjustment mass, and the other end of each second insertion hole is a deep end that does not reach the side surface of the adjustment mass, the additional mass is provided with a plurality of second screw holes through which the second bolts inserted into the second insertion holes are screwed, and all of these second insertion holes and second screw holes are arranged asymmetrically with respect to the center of the adjustment mass, the vibration damping device for building structures as described in (i), (iii) The additional mass is bolted to the main mass at multiple locations by the first bolts, and the first screw holes in the main mass into which the first bolts are screwed and the first insertion holes in the additional mass through which the first bolts are inserted are both asymmetrical with respect to the center of the additional mass, as described in (ii), (iv) The additional mass has a pin that protrudes toward the adjustment mass and is inserted into the second insertion hole, provided on the opening end side of the second insertion hole rather than the second screw hole, and the distance from the pin to the opening end in the longitudinal direction of the second insertion hole is shorter than the distance from the rear end to the side of the adjustment mass located on the opposite side of the opening end, as described in (ii) or (iii), (v) A vibration damping device for building structures according to any one of (ii) to (iv), wherein the lengths of the plurality of second through holes are different from each other, and at least one of the second screw holes located in the longer second through hole is located further towards the back end than the shorter second through hole. (vi) A vibration damping device for building structures according to any one of (ii) to (v), wherein the width dimensions of the plurality of second through holes are different from each other, and the second screw hole located on the wider second through hole is larger in diameter than the second screw hole located on the narrower second through hole. (vii) The plurality of second insertion holes are at different distances from the center of the adjustment mass, a vibration damping device for building structures as described in any one of (ii) to (vi), (viii) A vibration damping device for building structures according to any one of (ii) to (vii), wherein the main mass is rectangular in plan view, the additional mass and the adjustment mass are arranged between the supports in the direction of the long side of the main mass, both ends of the adjustment mass in the direction of the long side of the main mass are located between adjacent supports in the direction of the long side of the main mass, and the second insertion hole of the adjustment mass extends in the direction of the short side of the main mass. (ix) The additional mass has a receiving recess for accommodating the head of the first bolt provided in the opening of the first insertion hole, and the opening of the receiving recess is covered by the adjustment mass, a vibration damping device for building structures according to any one of (i) to (viii), (x) The upper end of the support is attached to the main mass via a bracket, and the main mass is provided with a vertically penetrating work hole above the connection between the support and the bracket, a vibration damping device for building structures according to any one of (i) to (ix), This includes inventions relating to the present invention. In the invention described in (i) above, since the additional mass, which has a relatively large mass, is fixed to the main mass with a first bolt, the mass of the mass member can be greatly increased by the additional mass, which is fixed to the main mass and cannot be removed. Therefore, the vibration damping effect of the secondary vibration system, which is composed of vibration damping devices, is effectively exerted on the building structure that constitutes the main vibration system, thereby improving the vibration state of the building structure. Moreover, since the additional mass is attached by overlapping it with the lower surface of the main mass, which is supported from below by a support, the additional mass can be arranged by effectively utilizing the space between the support, for example. Since the adjustment mass, which is lighter than the additional mass, is detachably attached to the additional mass with a second bolt separate from the first bolt, by loosening the second bolt, the adjustment mass can be removed or added while the additional mass remains fixed to the main mass. This makes it possible to adjust the mass of the mass member by attaching or detaching only the lightweight adjustment mass without the need for an operator to support the relatively large additional mass. Accordingly, when a large secondary mass is required, the mass of the secondary mass can be secured by the additional mass, while the resonant frequency of the secondary vibration system can be easily tuned by the adjustment mass. In the invention described in (ii) above, the second insertion hole through which the second bolt is inserted is slit-shaped, so that the adjustment mass can be easily attached to and detached from the additional mass by sliding the adjustment mass in the longitudinal direction of the second insertion hole and removing the second bolt from the second insertion hole or inserting it into the second insertion hole, without completely removing the second bolt from the second screw hole. Since one end of the multiple second insertion holes is an open end that opens to the same side of the adjustment mass, and the other end is a deep end that does not reach the side of the adjustment mass, the sliding direction of the adjustment mass is defined to one side in the longitudinal direction of the second insertion hole. In the invention described in (iii) above, if the additional cell is installed in the wrong orientation relative to the main cell, the manner in which the additional cell is installed relative to the main cell will differ from when it is installed in the correct orientation, or it may become impossible to install the additional cell to the main cell. Therefore, an error in the orientation when installing the additional cell to the main cell can be easily detected by visual inspection or the like. In this way, by installing the additional cell in the correct orientation relative to the main cell, it is possible to prevent the sliding direction of the adjustment cell relative to the main cell from being in an unintended direction when attaching or detaching the adjustment cell to the additional cell. In the invention described in (iv) above, when the adjustment mass is mounted in a sliding direction opposite to that of the additional mass, the mounting position of the adjustment mass relative to the additional mass is shifted in the longitudinal direction of the second insertion hole due to the contact between the pin inserted into the second insertion hole and the inner end of the second insertion hole. This makes it easy to prevent the adjustment mass from being mounted in the wrong orientation relative to the additional mass by visual inspection or the like. In the invention described in (v) above, if the mounting orientation of the adjustment mass to the additional mass is not appropriate, the mounting position of the adjustment mass to the additional mass will be shifted due to the difference in the length dimensions of the multiple second insertion holes, so the incorrect assembly can be easily detected by visual inspection or the like. In the invention described in (vi) above, if the orientation of the adjustment mass to the additional mass is not appropriate, bolt fixing becomes impossible due to differences in the width dimensions of the multiple second insertion holes and the diameter of the second screw holes, making it easy to detect incorrect assembly. In the invention described in (vii) above, if the mounting orientation of the adjustment mass to the additional mass is not appropriate, the mounting position of the adjustment mass to the additional mass will be shifted due to the difference in the distance of the multiple second insertion holes from the center of the adjustment mass, making it easy to detect incorrect assembly. In the invention described in (viii) above, the sub-mass is positioned between the supports in the long-side direction of the main mass, thereby securing a large area for the sub-mass to be positioned. Since the second insertion hole of the adjustment mass extends in the short-side direction of the main mass, the sliding direction when attaching or detaching the adjustment mass is in the short-side direction of the main mass, and the adjustment mass slides between the supports positioned on both sides in the long-side direction of the main mass, interference between the adjustment mass and the supports is less likely to be a problem when attaching or detaching the adjustment mass. In the invention described in (ix) above, the head of the first bolt that fixes the additional mass to the main mass is housed in the housing recess, allowing the adjustment mass to extend to the opening of the housing recess, thereby efficiently securing the mass of the adjustment mass. Since the additional mass is held in a fixed state relative to the main mass, and the attachment and detachment of the adjustment mass to the additional mass is performed by operating the second bolt, the operation of adjusting the mass of the mass member is not affected even if the opening of the housing recess is covered by the adjustment mass. In the invention described in (x) above, the connecting part that connects the support and the mounting bracket can be operated from above through a work hole that penetrates the main mass, making it easy to attach the support to the mounting bracket and adjust the orientation of the support during manufacturing. [Explanation of Symbols]

[0102] 10. Vibration damping device (first embodiment) 12 Mass members 14. Rubber mount (support) 16 Main squares 18 bracket mounting holes 20 working holes 22 First screw hole 24 Plate members 26. Rubber elastic material 28 Slope 30 First mounting member 32 brackets 34 Groove 36 Mounting piece 37 Mounting bolts 38 Upper fastening bolts 40 nuts 42 Second mounting member 43 Lower fastening bolts 44 Sub-mass 46 additional spaces 48 Adjustment squares 50 First insertion hole 52 Receiving recess 54(54a,54b) Second screw hole 56 pins 58 Pin fixing holes 60 First bolt 62 Head 64 (64a, 64b) Second insertion hole 66 Open end 68 Back end 70 Second bolt 72 Washer 74 Base member 76 Vibration-damping structures 78 Service hatch 80 Vibration damping device (second embodiment) 82 Adjustment squares 84 (84a, 84b) Second insertion hole 90 Vibration damping device (third embodiment) 92 Adjustment squares 94 (94a, 94b) Second insertion hole

Claims

1. In the vertical view, the main rectangular cell and A plurality of supports are positioned below the main mass and elastically connect the main mass to the base member. A vibration damping device for building structures, equipped with the following: Below the main mass, there is a sub-mass which includes an additional mass that is mounted on top of the lower surface of the main mass, and an adjustment mass that is lighter than the additional mass and is mounted on top of the lower surface of the additional mass. The additional mass is bolted to the main mass by a first bolt, and the adjustment mass is detachably fixed to the additional mass by a second bolt different from the first bolt. The main mass is rectangular in plan view, and the support members are arranged on both sides of the main mass in the direction of its long side. A vibration damping device for building structures, wherein the adjustment mass is provided with a second insertion hole through which the second bolt is inserted, and the second insertion hole extends in the direction of the short side of the main mass.

2. The adjustment mass is fixed to the additional mass at multiple locations by the second bolts. The adjustment mass is provided with a plurality of second insertion holes through which the second bolt is inserted. The second insertion holes are in the shape of straight slits extending parallel to each other, with one end of each second insertion hole being an open end that opens to the same side surface of the adjustment mass, and the other end of each second insertion hole being a deep end that does not reach the side surface of the adjustment mass. The additional mass is provided with a plurality of second screw holes into which the second bolt, inserted through the second insertion hole, is screwed. The vibration damping device for building structures according to claim 1, wherein both the second insertion hole and the second screw hole are arranged asymmetrically with respect to the center of the adjustment mass.

3. A main cell that is rectangular when viewed in the vertical direction, A plurality of supports are positioned below the main mass and elastically connect the main mass to the base member. A vibration damping device for building structures, equipped with the following: Below the main mass, there is a sub-mass which includes an additional mass that is mounted on top of the lower surface of the main mass, and an adjustment mass that is lighter than the additional mass and is mounted on top of the lower surface of the additional mass. The additional mass is bolted to the main mass by a first bolt, and the adjustment mass is detachably fixed to the additional mass by a second bolt different from the first bolt. The adjustment mass is fixed to the additional mass at multiple points by the second bolts, The adjustment mass is provided with a plurality of second insertion holes through which the second bolt is inserted. The second insertion holes are in the shape of straight slits extending parallel to each other, with one end of each second insertion hole being an open end that opens to the same side surface of the adjustment mass, and the other end of each second insertion hole being a deep end that does not reach the side surface of the adjustment mass. The additional mass is provided with a plurality of second screw holes into which the second bolt, inserted through the second insertion hole, is screwed. While both the second insertion hole and the second screw hole are positioned asymmetrically with respect to the center of the adjustment mass, A vibration damping device for building structures, wherein the additional mass is bolted to the main mass at multiple locations by the first bolt, and the first screw holes in the main mass into which the first bolt is screwed and the first insertion holes in the additional mass through which the first bolt is inserted are both asymmetrical with respect to the center of the additional mass.

4. The vibration damping device for building structures according to claim 2 or 3, wherein the additional mass has a pin that protrudes toward the adjustment mass and is inserted into the second insertion hole, the pin being provided on the opening end side of the second insertion hole rather than the second screw hole, and the distance from the pin to the opening end in the longitudinal direction of the second insertion hole is shorter than the distance from the inner end to the side surface of the adjustment mass located on the opposite side of the opening end.

5. The vibration damping device for a building structure according to claim 2 or 3, wherein the lengths of the plurality of second insertion holes are different from each other, and at least one of the second screw holes located in the longer second insertion hole is located further towards the back end than the shorter second insertion hole.

6. The vibration damping device for building structures according to claim 2 or 3, wherein the width dimensions of the plurality of second through holes are different from each other, and the second screw hole located on the wider second through hole has a larger diameter than the second screw hole located on the narrower second through hole.

7. The vibration damping device for a building structure according to claim 2 or 3, wherein the plurality of second insertion holes are at different distances from the center of the adjustment mass.

8. The aforementioned main mass is rectangular in plan view, In the direction of the long side of the main mass, the additional mass and the adjustment mass are arranged between the support, The ends of the adjustment mass in the short-side direction of the main mass are located between adjacent supports in the long-side direction of the main mass. The vibration damping device for a building structure according to claim 2 or 3, wherein the second insertion hole of the adjustment mass extends in the direction of the short side of the main mass.

9. The vibration damping device for a building structure according to claim 2 or 3, wherein the orientation of the adjustment mass when attached to the additional mass is uniquely defined when each of the second bolts is screwed into each of the second screw holes.

10. A main cell that is rectangular when viewed in the vertical direction, A plurality of supports are positioned below the main mass and elastically connect the main mass to the base member. A vibration damping device for building structures, equipped with the following: Below the main mass, there is a sub-mass which includes an additional mass that is mounted on top of the lower surface of the main mass, and an adjustment mass that is lighter than the additional mass and is mounted on top of the lower surface of the additional mass. The additional mass is bolted to the main mass by a first bolt, and the adjustment mass is detachably fixed to the additional mass by a second bolt different from the first bolt. The additional mass is provided with a first insertion hole through which the first bolt is inserted. A vibration damping device for building structures, wherein a receiving recess for accommodating the head of the first bolt is provided in the opening of the first insertion hole, and the opening of the receiving recess is covered by the adjustment mass.

11. A main cell that is rectangular when viewed in the vertical direction, A plurality of supports are positioned below the main mass and elastically connect the main mass to the base member. A vibration damping device for building structures, equipped with the following: Below the main mass, there is a sub-mass which includes an additional mass that is mounted on top of the lower surface of the main mass, and an adjustment mass that is lighter than the additional mass and is mounted on top of the lower surface of the additional mass. The additional mass is bolted to the main mass by a first bolt, and the adjustment mass is detachably fixed to the additional mass by a second bolt different from the first bolt. The upper end of the support is attached to the main mass via a bracket, A vibration damping device for building structures, wherein the main mass is provided with a working hole that penetrates vertically above the connection between the support and the bracket.

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