Anti-vibration structure

Abstract

To provide a vibration control structure having small bending deformation and shear deformation with respect to an axial direction while exhibiting a vibration control effect with respect to the axial direction.SOLUTION: A suspending member 50 is composed of a vibration control member 100, and an upper suspension member 52 and a lower suspension member 53 which are joined to both sides of the vibration control member 100 in an axial direction and coaxially arranged. The axial rigidity of the vibration control member 100 is smaller than the axial rigidity of the upper suspension member 52 and the lower suspension member 53, and the bending rigidity and shear rigidity of the vibration control member 100 are equal to or larger than those of the upper suspension member 52 and the lower suspension member 53.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a vibration-isolating structure. [Background technology]

[0002] Patent Document 1 discloses a technique for attenuating and filtering vibration amplitudes caused by mechanical causes in a structure to be isolated. This prior art is characterized by performing filtering of incident vibration waves combined with attenuation by providing attenuation of the filtered vibration waves transmitted to the structure for a very wide frequency band and amplitude range of mechanical stresses applied to the structure.

[0003] Patent Document 2 discloses technology relating to a vibration-damping member on which equipment that generates vibration, such as a press machine, can be placed to reduce the vibration of the equipment. This prior art is characterized by including an equipment mounting section on which the equipment is placed, a plurality of disc springs that are stacked in the vertical direction and interposed between the support section and the equipment mounting section, and a disc spring support section that supports the plurality of disc springs by restraining their displacement and deformation in directions other than the vertical direction.

[0004] Patent Document 3 discloses a technology relating to a unit cell of an artificial phononic crystal for constructing an artificial phononic metamaterial. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 5105875 [Patent Document 2] Japanese Patent Application Laid-Open No. 2013-53720 [Patent Document 3] Japanese Patent Application Publication No. 2019-522151 Summary of the Invention [Problem to be solved by the invention]

[0006] Anti-vibration materials often achieve vibration isolation performance by using springs or rubber to reduce axial rigidity. However, springs and rubber also have low axial shear and bending rigidity. Therefore, for example, during an earthquake, horizontal displacement of the ceiling or other structure suspended by the anti-vibration material increases.

[0007] In view of the above, an object of the present invention is to provide a vibration-damping structure that exhibits vibration-damping effect in the axial direction while experiencing small bending and shearing deformations when forces in the bending and shearing directions act on it. [Means for solving the problem]

[0008] The first aspect is a vibration-damping structure composed of a vibration-damping member and support members joined to both axial sides of the vibration-damping member and arranged coaxially, wherein the axial rigidity of the vibration-damping member is smaller than the axial rigidity of the support members, and the bending rigidity and shear rigidity of the vibration-damping member are equal to or greater than the bending rigidity and shear rigidity of the support members.

[0009] In the vibration-damping structure described in the first aspect, vibration-damping performance is exhibited against axial vibrations between one support member and the other support member by making the axial rigidity of the vibration-damping member smaller than the axial rigidity of the support member. Also, when bending and shear forces act between one support member and the other support member, by making the bending rigidity and shear rigidity of the vibration-damping member equal to or greater than the bending rigidity and shear rigidity of the support member, bending deformation and shear deformation are reduced compared to when the rigidity is less than the same.

[0010] Here, "the axial rigidity of the vibration-damping member is less than the axial rigidity of the support member" means that the axial rigidity of the vibration-damping structure composed of the vibration-damping member and the support member is less than the axial rigidity if the vibration-damping structure were composed of only the support member.

[0011] Furthermore, "the bending rigidity and shear rigidity of the vibration-damping member are equal to or greater than the bending rigidity and shear rigidity of the support member" means that the bending rigidity and shear rigidity of the vibration-damping structure composed of the vibration-damping member and the support member are equal to or greater than the bending rigidity and shear rigidity if the vibration-damping structure were composed only of the support member.

[0012] When a vibration-isolating structure has multiple vibration-isolating members, the vertical axis of the multiple vibration-isolating members as a whole is considered to be the axis of the vibration-isolating member.

[0013] The second aspect is a vibration-damping structure of the first aspect, in which the vibration-damping member has a cylindrical body having an internal shaft portion that is joined to one of the support members and connected to the other support member, and multiple panel members that are arranged axially spaced apart within the cylindrical body, with their centers joined to the shaft portion and their outer edges joined to the inner surface of the cylindrical body.

[0014] In the vibration-damping structure described in the second aspect, when axial vibration occurs between one support member and the other support member, the face plates provided inside the cylinder at intervals in the axial direction undergo out-of-plane deformation in the axial direction via the shaft portion joined to the other support member, thereby demonstrating vibration-damping performance. Furthermore, when bending and shear forces act between the one support member and the other support member, the face plates whose outer edges are joined to the cylinder resist the force via the shaft portion joined to the other support member, thereby reducing bending and shear deformation.

[0015] A third aspect is the vibration-damping structure described in the first aspect, in which the vibration-damping member is a hollowed-out structure having anisotropic rigidity, with axial rigidity smaller than that of the support member, and with bending rigidity and shear rigidity equal to or greater than that of the support member.

[0016] In the vibration-damping structure of the third aspect, vibration-damping performance is exerted against axial vibrations between one support member and the other support member by the vibration-damping member that has been hollowed out so that its axial rigidity is smaller than that of the support member. Furthermore, when bending and shear forces act between one support member and the other support member, the vibration-damping member that has been hollowed out so that its bending rigidity and shear rigidity are equal to or greater than those of the support member reduces bending and shear deformation compared to when its rigidity is smaller than the same. [Effects of the Invention]

[0017] According to the present invention, the vibration-isolating structure can reduce bending deformation and shear deformation in the axial direction while exerting a vibration-isolating effect in the axial direction. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a front view of a suspended ceiling using a suspension member according to a first embodiment of the present invention. [Figure 2] 1 is a cross-sectional view taken along the axial direction of a vibration-damping member of a suspension member according to a first embodiment of the present invention. FIG. [Figure 3] FIG. 2 is a perspective view of a vibration-isolating member of the hanging member according to the first embodiment of the present invention. [Figure 4] 1A is a stress distribution diagram of a suspending member of a comparative example, and FIG. 1B is a stress distribution diagram of a suspending member of the first embodiment. [Figure 5] 1 is a graph showing the vibration-damping characteristics of the suspension member of the first embodiment of the present invention. [Figure 6] FIG. 10 is a perspective view of a unit constituting a vibration-isolating member of a hanging member according to a second embodiment of the present invention. [Figure 7] FIG. 10 is a perspective view of a structure constituting a vibration-damping member of a hanging member according to a second embodiment of the present invention. [Figure 8] FIG. 10 is a perspective view of a vibration-isolating member of a hanging member according to a second embodiment of the present invention. [Figure 9] FIG. 10 is a perspective view of a structure according to a first modified example of the second embodiment of the present invention. [Figure 10] FIG. 10 is a perspective view of a structure according to a second modified example of the second embodiment of the present invention. [Figure 11] FIG. 10 is a front view of a vibration isolation device according to a third embodiment of the present invention, with equipment fixed on top of the device. [Figure 12] FIG. 10 is a plan view schematically showing a vibration isolation device according to a third embodiment of the present invention. [Figure 13] FIG. 1 is a front view of a hanging member using an existing vibration-isolating member. DETAILED DESCRIPTION OF THE INVENTION

[0019] First Embodiment A suspension member will be described as an example of a vibration-proof structure according to a first embodiment of the present invention. Two directions perpendicular to the horizontal direction are designated as the X direction and the Y direction, and are indicated by arrows X and Y, respectively. The vertical direction perpendicular to the X direction and the Y direction is designated as the Z direction, and is indicated by arrow Z. These directions are those when the vibration-proof member is used as a suspension member, as will be described later.

[0020] [structure] The structure of the hanging member of this embodiment will be described.

[0021] The suspended ceiling 10 shown in Figure 1 is composed of hanging members 50, T-bars 30 suspended from a slab 20 by the hanging members 50, and ceiling materials 32 joined to the T-bars 30. The T-bars 30 are arranged in a lattice pattern in a plan view. Note that the structure of the suspended ceiling 10 is an example and is not limited to this.

[0022] Hanging member 50, which is an example of a vibration-isolating structure, is composed of upper and lower hanging members 52 and 53, which are examples of support members, and vibration-isolating member 100. Upper hanging member 52, lower hanging member 53, and vibration-isolating member 100 are arranged so that their vertical axes coincide, i.e., they are coaxial. In this embodiment, the axial direction is the vertical direction.

[0023] In this embodiment, the upper hanger 52 and the lower hanger 53 are steel bars of the same diameter. The upper end of the upper hanger 52 is fixed to the slab 20, and the lower end 54 (see FIG. 2) is joined to the vibration-isolating member 100. The lower hanger 53 has an upper end 55 (see FIG. 2) joined to the vibration-isolating member 100, and the lower end is connected to the T-bar 30.

[0024] The vibration-damping member 100 shown in Figures 1 and 2 is a member made of synthetic resin whose axial rigidity is smaller than the axial rigidity of the upper hanger 52 and the lower hanger 53, and whose bending rigidity and shear rigidity are set to be equal to or greater than the bending rigidity and shear rigidity of the upper hanger 52 and the lower hanger 53.

[0025] Here, "the axial rigidity of the vibration-damping member 100 is less than the axial rigidity of the upper hanger 52 and the lower hanger 53" means that the axial rigidity of the entire hanger 50, in which the vibration-damping member 100 is joined between the upper hanger 52 and the lower hanger 53, is less than the axial rigidity of the hanger 800 (see Figure 4(A)), which is composed only of steel rod material that makes up the upper hanger 52 and the lower hanger 53.

[0026] Furthermore, "the bending rigidity and shear rigidity of the vibration-damping member 100 are equal to or greater than the bending rigidity and shear rigidity of the upper hanging member 52 and the lower hanging member 53" means that the bending rigidity and shear rigidity of the entire hanging member 50 in which the vibration-damping member 100 is joined between the upper hanging member 52 and the lower hanging member 53 are equal to or greater than the bending rigidity and shear rigidity axial rigidity of the hanging member 800 (see Figure 4(A)) which is composed only of steel rod material that makes up the upper hanging member 52 and the lower hanging member 53.

[0027] As shown in Fig. 2, the vibration-damping member 100 of this embodiment is configured to include a tubular body 110, a shaft portion 120, and a face material 130. In this embodiment, the tubular body 110 is cylindrical (see Fig. 3) and the shaft portion 120 is columnar, but this is not limiting. For example, the tubular body may be rectangular and the shaft portion may be rectangular.

[0028] The cylindrical body 110 has a cylindrical side wall portion 112 and a ceiling portion 114. The ceiling portion 114 has a joint portion 140 formed on its axis, the joint portion 140 having a screw hole 142 formed therein along the axial direction.

[0029] A face member 130 and a shaft portion 120 are provided inside the cylindrical body 110. The shaft portion 120 is provided on the axis of the cylindrical body 110, and has a screw hole 143 formed inside along the axial direction.

[0030] A plurality of disc-shaped face materials 130 are provided at intervals in the axial direction inside the cylindrical body 110. The shaft portion 120 is joined to the axial center portion of the face material 130 so as to pass through it, and the outer edge portion 132 is joined to the inner peripheral surface 112A of the cylindrical body 110.

[0031] 2, the side wall 112, ceiling 114, and face material 130 of the cylindrical body 110 are shown to have the same thickness, but this is not limited to this. For example, as will be described later, the face material 130 functions as a leaf spring that elastically deforms in the out-of-plane direction (axial direction), so the face material 130 may have a thickness smaller than the thicknesses of the side wall 112 and ceiling 114 of the cylindrical body 110.

[0032] A thread is cut into the lower end 54 of the upper hanger 52, and the thread is screwed into a threaded hole 142 of a joint 140 of the vibration-damping member 100, thereby joining the tubular body 110 of the vibration-damping member 100. Similarly, a thread is cut into the upper end 55 of the lower hanger 53, and the thread is screwed into a threaded hole 143 of the shaft 120 of the vibration-damping member 100, thereby joining the shaft 120 of the vibration-damping member 100.

[0033] The joining structure between the upper and lower hanging members 52, 53 and the vibration-proof member 100 is merely an example and is not limited to this.

[0034] The vibration-damping member 100 of this embodiment is made of synthetic resin, and is configured such that the cylindrical body 110, the shaft portion 120, and the face material 130 are integrated together. Note that the vibration-damping member 100 of this embodiment is manufactured using a 3D printer, but this is not a limitation. For example, parts that are semicircular in shape when viewed in the axial direction may be manufactured and joined together to form an integrated body.

[0035] As mentioned above, the vibration-damping member 100 is set so that its axial rigidity is smaller than that of the upper hanger 52 and the lower hanger 53, and its bending rigidity and shear rigidity are equal to or greater than those of the upper hanger 52 and the lower hanger 53; for example, the diameter and thickness of the cylindrical body 110, the thickness, number and spacing of the face material 130, etc. are set.

[0036] Also, from another perspective, the vibration-damping member 100 of this embodiment can be said to be a mechanical metamaterial with anisotropy in rigidity, in which the axial rigidity is smaller than the axial rigidity of the upper hanger 52 and the lower hanger 53, and the bending rigidity and shear rigidity are equal to or greater than the bending rigidity and shear rigidity of the upper hanger 52 and the lower hanger 53.

[0037] [Effect] Next, the operation of this embodiment will be described.

[0038] First, a suspension member 500 having a vibration-isolating member 600, which is an example of a conventional vibration-isolating member shown in FIG. 13, will be described.

[0039] Conventional vibration-damping member 600 in this example is configured to have a steel frame portion 610 and a rubber portion 620. Frame portion 610 has a structure in which plate material is molded into a rectangular frame shape, and through holes 614 and 615 are formed in ceiling portion 612 and bottom portion 613, respectively. Rubber portion 620 is provided on bottom portion 613 of frame portion 610. Rubber portion 620 also has a through hole 622 formed in it.

[0040] The lower end 54 of the upper hanging member 52 is inserted into the through-hole 614 in the ceiling portion 612 of the frame portion 610 and fastened with a nut 700. The upper end 55 of the lower hanging member 53 is inserted into the through-holes 615, 622 in the bottom surface portion 613 and rubber portion 620 of the frame portion 610 and fastened with a nut 700.

[0041] The rubber portion 620 of the vibration-isolating member 600 of the hanging member 500 configured in this manner has less axial rigidity and elastically deforms in the axial direction than the upper hanging member 52 and the lower hanging member 53. Therefore, the axial vibration transmitted between the slab 20 (see FIG. 1) and the ceiling material 32 (see FIG. 1) via the hanging member 500 is reduced by the elastic deformation of the rubber portion 620 in the axial direction.

[0042] On the other hand, rubber part 620 has lower shear rigidity and bending rigidity in the axial direction than upper hanging member 52 and lower hanging member 53, and is elastically deformed in the shear direction (horizontal direction) and bending direction. Therefore, as shown in Figure 13(B), during an earthquake, displacement in the horizontal direction and bending direction relative to the axial direction of lower hanging member 53 is large, causing greater lateral shaking of ceiling material 32 (see Figure 1). Note that Figure 13(B) illustrates displacements larger than they actually are to make it easier to understand.

[0043] In contrast, the vibration-damping member 100 of the hanging member 50 of this embodiment shown in Figures 1 to 3 is set so that its axial rigidity is smaller than the axial rigidity of the upper hanging member 52 and the lower hanging member 53, and its bending rigidity and shear rigidity are equal to or greater than the bending rigidity and shear rigidity of the upper hanging member 52 and the lower hanging member 53.

[0044] Therefore, axial vibrations transmitted between the slab 20 (see FIG. 1) and the ceiling material 32 (see FIG. 1) via the hanging member 50 are reduced by the vibration-damping member 100. Specifically, the vibrations in the axial direction are reduced by elastically deforming in the axial direction (out-of-plane direction) of the multiple face members 130 provided at intervals in the axial direction of the vibration-damping member 100.

[0045] On the other hand, the bending rigidity and shear rigidity of the vibration-damping member 100 are set to be equal to or greater than those of the upper hanging member 52 and the lower hanging member 53. Therefore, during an earthquake, the horizontal and bending displacement of the lower hanging member 53 relative to the axial direction is small, thereby reducing lateral sway of the ceiling material 32 (see FIG. 1). Specifically, the face material 130, to which the shaft 120 joined to the lower hanging member 53 at its center, serves as a horizontal resistance element, thereby reducing the horizontal displacement of the shaft 120. Furthermore, because the upper and lower ends of the shaft 120 of the vibration-damping member 100 are fixed by the face material 130, the bending displacement of the shaft 120 is reduced.

[0046] [experiment] Next, an experiment on the bending rigidity and vibration damping effect against axial vibration of the hanging member 50 of this embodiment will be described.

[0047] FIG. 4(A) shows a suspension member 800 of a comparative example, and FIG. 4(B) shows a suspension member 50 using the vibration-damping member 100 of this embodiment, which was produced using a 3D printer.

[0048] 4(A) is made up of only the same steel rod material as the upper hanger member 52 and the lower hanger member 53. The total axial length of the hanger member 800 of the comparative example is the same as the total axial length of the hanger member 50 of this embodiment.

[0049] Figure 4(A) shows the stress distribution and deformation amount L1 when the upper end of the hanging member (bar) 800 of the comparative example is fixed and a horizontal load is applied to the lower end. Figure 4(B) shows the stress distribution and deformation amount L2 when the upper end of the hanging member 50 of this embodiment is fixed and a horizontal load is applied to the lower end. Note that the denser the dots, the greater the stress. As can be seen from this figure, the stress distribution and deformation amount L1 of the hanging member 800 of the comparative example are equivalent to the stress distribution and deformation amount L2 of the hanging member 50 of this embodiment.

[0050] The experiment was carried out with horizontal loads ranging from 0 to 10 N, and in all cases, the stress distribution and deformation amount of the suspending member 50 of this embodiment were equal to or greater than those of the suspending member 800 of the comparative example.

[0051] From this, it can be seen that the bending rigidity and shear rigidity of the vibration-isolating member 100 are equal to or greater than the bending rigidity and shear rigidity of the upper hanger 52 and the lower hanger 53.

[0052] 5 is a graph showing the results of a vibration test in which the upper end of a hanging member 50 using a vibration-damping member 100 produced using a 3D printer was fixed and a 10 kg weight was hung from the lower end. Specifically, the graph shows the results of measuring the ratio between the magnitude of vibration input from upper hanging member 52 to vibration-damping member 100 and the magnitude of vibration transmitted from vibration-damping member 100 to lower hanging member 53.

[0053] This graph shows one clear peak and that the magnitude of vibration is reduced in the frequency band higher than the frequency at which the peak occurs, which shows that the vibration-damping member 100 exhibits ideal vibration-damping characteristics of a single-mass system against axial vibrations.

[0054] This shows that the vibration-isolating member 100 has a high vibration-isolating effect against vibrations in the axial direction.

[0055] Second Embodiment A suspension member will be described as an example of a vibration-proof structure according to a second embodiment of the present invention. Note that the same members as those in the first embodiment are given the same reference numerals, and redundant descriptions will be omitted or simplified.

[0056] [structure] The structure of the suspending member of this embodiment will be described. Since the components other than the vibration-isolating member are the same as those of the first embodiment, the vibration-isolating member will be mainly described.

[0057] The vibration-damping member 200 that constitutes the hanging member 60 of this embodiment shown in Figure 8 is a resin member whose axial rigidity is smaller than the axial rigidity of the upper hanging member 52 and the lower hanging member 53, and whose bending rigidity and shear rigidity are set to be equal to or greater than the bending rigidity and shear rigidity of the upper hanging member 52 and the lower hanging member 53.

[0058] The vibration-damping member 200 of this embodiment is composed of a plurality of units 210 (see FIG. 6). The unit 210 shown in FIG. 6 has a pair of first plates 212 that are generally rectangular in plan view and arranged opposite each other in the axial direction, and a second plate 220 that connects side portions 214A, 214B, 214C, and 214D of the pair of first plates 212 and is curved in the out-of-plane direction. Note that when the side portions 214A, 214B, 214C, and 214D are not to be distinguished from each other, they will simply be referred to as side portions 214.

[0059] The first plate 212 has a square shape in plan view with the corners thereof cut into an arc shape, and the thickness direction of the plate is the axial direction. The thickness direction of the second plate 220 is the X direction or the Y direction, and the second plate 220 is curved out of the plane toward the center of the first plate 212 in plan view. The corners of the first plate 212 do not have to be cut into an arc shape. For example, the corners of the first plate 212 may be cut into a straight line, or may be a true rectangle without being cut into a line. Furthermore, the first plate 212 does not have to be square in plan view, as long as it is rectangular.

[0060] As shown in Fig. 7, the units 210 are arranged in the X and Y directions perpendicular to the axial direction, and the sides 214 (see Fig. 6) of adjacent first plates 212 are joined together. Specifically, the side 214A and the side 214C shown in Fig. 6 are joined together, and the side 214C and the side 214D are joined together. Note that the units 210 shown in Fig. 7 arranged in the X and Y directions are referred to as a structure 250.

[0061] As shown in Figure 8, an upper fixing portion 260 and a lower fixing portion 270 are respectively joined to the first plate 212 (see Figure 6) that forms the upper surface 252 of the structure 250 in which multiple units 210 are arranged in Figure 7, and the first plate 212 (see Figure 6) that forms the lower surface 254.

[0062] 8, the upper fixing part 260 is a rectangular plate in plan view, and is provided with an upper joint part 262 having a screw hole (not shown) formed on its axis. Similarly, the lower fixing part 270 is a rectangular plate in plan view, and is provided with a lower joint part 272 having a screw hole (not shown) formed on its axis.

[0063] In the vibration-damping member 200 of this embodiment, the structure 250 made up of a plurality of units 210, the upper fixing portion 260, and the lower fixing portion 270 are integrated, and the entire structure is manufactured using a 3D printer, but this is not limited to this. For example, the structure 250 made up of the units 210 may be manufactured using a 3D printer, and the upper fixing portion 260 and the lower fixing portion 270 may be manufactured and joined by molding. Alternatively, only the units 210 may be manufactured using a 3D printer, and these may be lined up and joined to form the structure 250. The units 210 may also be manufactured using a method other than a 3D printer.

[0064] 8, the upper hanger 52 is joined to the vibration-damping member 200 by screwing its threaded lower end 54 into a screw hole (not shown) in the upper joint 262 of the upper fixing portion 260 of the vibration-damping member 200. Similarly, the lower hanger 53 is joined to the vibration-damping member 200 by screwing its threaded upper end 55 into a screw hole (not shown) in the lower joint 272 of the lower fixing portion 270 of the vibration-damping member 200.

[0065] 6, the unit 210 alone has low rigidity against deformation in the axial direction (vertical direction) because the curved second plate 220 elastically deforms in the out-of-plane direction. Furthermore, the unit 210 has high rigidity against deformation in the shear direction because the second plate 220, whose thickness direction is perpendicular to the shear direction, resists deformation in the shear direction. For example, the second plate 220 connecting the upper and lower side portions 214C and the upper and lower side portions 214A resist shear deformation in the X direction.

[0066] The second plate 220 elastically deforms and therefore has low rigidity with respect to deformation in the bending direction of the unit 210. For example, in the case of rotation around the Y axis in Fig. 6, the second plate 220 connecting the upper and lower side portions 214B and the second plate 220 connecting the upper and lower side portions 214D elastically deform, so the bending rigidity is not high.

[0067] In a structure 250 in which multiple units 210 are arranged, the axial rigidity and shear rigidity are equal to the number of arranged units 210. On the other hand, with regard to bending rigidity, the resistance force in the bending direction increases with increasing distance from the axis of the bending moment, so the bending rigidity is at least equal to the number of units. Therefore, the more units 210 arranged, the greater the difference between the axial rigidity and bending rigidity of the structure 250. In other words, the structure 250 has low rigidity only in the axial direction.

[0068] Therefore, by adjusting the size and thickness of the first plate 212 and second plate 220 of unit 210 and the number of units 210 arranged, it is possible to set the axial rigidity to be smaller than the axial rigidity of the upper hanging member 52 and the lower hanging member 53, and the bending rigidity and shear rigidity to be equal to or greater than the bending rigidity and shear rigidity of the upper hanging member 52 and the lower hanging member 53.

[0069] From another perspective, vibration-damping member 200, structure 250, and unit 210 have a hollow structure in which the spaces between upper and lower first plates 212 and curved second plates 220 on all four sides are hollow. Therefore, vibration-damping member 200 is hollowed out so that its axial rigidity is smaller than that of upper hanger 52 and lower hanger 53, and its bending rigidity and shear rigidity are equal to or greater than those of upper hanger 52 and lower hanger 53, and can be said to be a hollowed out structure with anisotropic rigidity.

[0070] Alternatively, the vibration-damping member 200 can be said to be a mechanical metamaterial with anisotropy in rigidity, in which the axial rigidity is smaller than the axial rigidity of the upper hanger 52 and the lower hanger 53, and the bending rigidity and shear rigidity are equal to or greater than the bending rigidity and shear rigidity of the upper hanger 52 and the lower hanger 53.

[0071] [Effect] Next, the operation of this embodiment will be described.

[0072] As in the first embodiment, the vibration-damping member 200 of the hanging member 60 of this embodiment shown in Figure 8 is set so that its axial rigidity is smaller than the axial rigidity of the upper hanging member 52 and the lower hanging member 53, and its bending rigidity and shear rigidity are equal to or greater than the bending rigidity and shear rigidity of the upper hanging member 52 and the lower hanging member 53.

[0073] Therefore, axial vibrations transmitted between the slab 20 (see FIG. 1) and the ceiling material 32 (see FIG. 1) via the hanging member 60 are reduced by the vibration-isolating member 200. Specifically, the curved second plate 220 of the unit 210 of the vibration-isolating member 200 is elastically deformed, thereby reducing the axial vibrations.

[0074] On the other hand, the bending rigidity and shear rigidity of vibration-isolating member 200 are set to be equal to or greater than those of upper hanging member 52 and lower hanging member 53. Therefore, during an earthquake, the horizontal and bending displacement of lower hanging member 53 relative to the axial direction is small, so lateral shaking of ceiling material 32 (see FIG. 1) is reduced.

[0075] [Variations] A modified example of the structure of the second embodiment will now be described.

[0076] In the above embodiment, a plurality of units 210 are joined in line in the X and Y directions, but this is not limiting. Two or more units 210 may be joined together so as to achieve the required axial rigidity, bending rigidity, and shear rigidity. Therefore, next, other examples will be described as modified examples.

[0077] (First Modification) 9, in a structural body 255 of the first modified example, units 210 are joined together and arranged in a lattice pattern along the X and Y directions. Furthermore, the units 210 are stacked only in the rows along the X direction.

[0078] (Second Modification) 10, in a structural body 257 of the second modified example, units 210 are arranged in the X direction and the Y direction and are stacked and bonded in the Z direction. From another perspective, this is a structure in which structural bodies 250 are stacked in the Z direction.

[0079] Third Embodiment A vibration isolation device 70 will be described as an example of a vibration isolation structure according to a third embodiment of the present invention.

[0080] [structure] As shown in FIG. 11, equipment 82 such as a motor, which is a vibration source, is fixed on top of a vibration isolation device 70 installed on a slab 80.

[0081] The vibration isolation device 70 is composed of a plurality of vibration isolation members 300, bolts 74, an upper frame 72, and a lower frame 73. The vertical axes of the plurality of vibration isolation members 300 coincide with the vertical axes G (see FIG. 12) of the upper frame 72 and the lower frame 73, i.e., they are arranged coaxially.

[0082] As will be described later, in plan view, the vibration-damping members 300 are arranged at the corners of a rectangle. The "vertical axis of the plurality of vibration-damping members 300" refers to the center position of the rectangle. From another perspective, the vertical axis of the plurality of vibration-damping members 300 when viewed as a single vibration-damping member is the axis G of the plurality of vibration-damping members 300.

[0083] The upper frame 72 and the lower frame 73 are each configured by assembling steel frames into a rectangular frame shape in plan view (see also FIG. 12). Vibration-isolating members 300 are provided between the corners of these rectangular frame-shaped upper frame 72 and lower frame 73.

[0084] The vibration-damping member 300 of this embodiment has a configuration in which an upper fixing portion 360 and a lower fixing portion 370 are provided above and below a structure 257 (see FIG. 10) of the second modified example of the second embodiment. The upper fixing portion 360 is a plate-like member that is rectangular in plan view, and has screw holes (not shown) formed in each corner. Similarly, the lower fixing portion 370 is a plate-like member that is rectangular in plan view, and has screw holes (not shown) formed in each corner.

[0085] The upper frame 72 is joined to the vibration-isolating member 300 by screwing bolts 74 into screw holes (not shown) in the corners of the upper fixing portion 360 of the vibration-isolating member 300. Similarly, the lower frame 73 is joined to the vibration-isolating member 300 by screwing bolts 74 into screw holes (not shown) in the corners of the lower fixing portion 370 of the vibration-isolating member 300.

[0086] The multiple vibration-damping members 300 as a whole can be set so that their axial rigidity is smaller than the axial rigidity of the upper frame 72 and the lower frame 73 including the bolt 74, and their bending rigidity and shear rigidity are equal to or greater than the bending rigidity and shear rigidity of the upper frame 72 and the lower frame 73 including the bolt 74.

[0087] Here, "the axial rigidity of the entire plurality of vibration-damping members 300 is less than the axial rigidity of the upper frame 72 and the lower frame 73 including the bolts 74" means that the axial rigidity of the entire vibration-damping device 70 in which the plurality of vibration-damping members 300 are joined between the upper frame 72 and the lower frame 73 with bolts 74 is less than the axial rigidity when the same frame as the upper frame 72 and the lower frame 73 is sandwiched between them and joined with bolts 74.

[0088] Furthermore, "the bending rigidity and shear rigidity of the entire plurality of vibration-damping members 300 are equal to or greater than the bending rigidity and shear rigidity of the upper frame 72 and the lower frame 73 including the bolts 74" means that the bending rigidity and shear rigidity of the entire vibration-damping device 70 in which the plurality of vibration-damping members 300 are joined between the upper frame 72 and the lower frame 73 with the bolts 74 are equal to or greater than the bending rigidity and shear rigidity in the axial direction when a frame the same as the upper frame 72 and the lower frame 73 is sandwiched between them and joined with the bolts 74. In this case, the bending rigidity and shear rigidity are at their smallest at the joining locations of the bolts 74.

[0089] [Effect] Next, the operation of this embodiment will be described.

[0090] The multiple vibration-damping members 300 of the vibration-damping device 70 of this embodiment shown in Figure 11 are set so that their axial rigidity is smaller than the axial rigidity of the upper frame 72 and the lower frame 73 including the bolt 74, and their bending rigidity and shear rigidity are equal to or greater than the bending rigidity and shear rigidity of the upper frame 72 and the lower frame 73 including the bolt 74.

[0091] Therefore, the axial (vertical) vibrations transmitted from the equipment 82 to the slab 80 via the vibration isolation device 70 are reduced by the vibration isolation member 300. Specifically, the curved second plate 220 of the unit 210 of the vibration isolation member 300 elastically deforms, thereby reducing the axial vibrations.

[0092] On the other hand, the bending rigidity and shear rigidity of vibration-isolating member 300 are set to be equal to or greater than those of upper frame 72 and lower frame 73, including bolts 74. Therefore, during an earthquake, the horizontal and bending displacement of lower hanging member 53 relative to the axial direction is small, and therefore lateral shaking of facility equipment 82 is small.

[0093] <Other> The present invention is not limited to the above embodiment.

[0094] For example, in the vibration-damping members 100, 200, and 300 of the above-described embodiments, the axial rigidity is reduced by a member (the face member 130 or the second plate 220) that elastically deforms in the axial direction, but this is not limiting. For example, the vibration-damping member may be a lightened structure having anisotropic rigidity, in which the cross-section of the member that bears bending and shear forces is large and the cross-section of the member that bears axial forces is small. Alternatively, the vibration-damping member may be a lightened structure having anisotropic rigidity, in which a virtual solid body is lightened so that the axial rigidity is smaller than the bending rigidity and shear rigidity.

[0095] Furthermore, for example, the vibration-damping members 100, 200, and 300 in the above embodiments use mechanical metamaterial technology, but this is not limited to this. For example, the vibration-damping members may use topology optimization technology or other technologies. In short, it is sufficient for the vibration-damping members to have axial rigidity less than the axial rigidity of the support member, and bending rigidity and shear rigidity equal to or greater than the bending rigidity and shear rigidity of the support member.

[0096] Furthermore, for example, the vibration-proof members 100, 200, and 300 in the above embodiments are made of synthetic resin, but the present invention is not limited to this and may be made of metal, for example.

[0097] In the embodiments, the vibration-isolating members are used in vibration-isolating devices for suspended ceilings and equipment, but the present invention is not limited to this. For example, the vibration-isolating members may be used to suppress lateral vibrations in a soundproof room. Specifically, the vibration-isolating members may be provided between the walls of an outer room and an inner room of a nested structure.

[0098] Furthermore, if the rigidity of the support members joined to one side and the other side of the vibration-isolating member in the axial direction differs, the smaller rigidity is used.

[0099] Furthermore, for example, the vibration-proof members 100, 200, and 300 in the above embodiments are made of synthetic resin, but the present invention is not limited to this and may be made of metal, for example.

[0100] Furthermore, the present invention can be embodied in various forms without departing from the spirit and scope of the present invention. A plurality of embodiments and modifications can be implemented in combination as appropriate. [Explanation of symbols]

[0101] 50 Hanging member (an example of vibration-proof structure) 52 Upper hanging member (an example of a support member) 53 Lower hanging member (an example of a support member) 60 Hanging member (an example of vibration-proof structure) 70 Anti-vibration device (an example of an anti-vibration structure) 72 Upper frame (example of support member) 73 Lower stand (example of support member) 74 Bolt (an example of a support member) 100 Vibration-proof member 110 Cylinder 112A Inner surface 120 Shaft 130 Surface material 132 outer edge 200 Vibration-proof member 210 units 212 First Plate 220 Second Plate 250 Structure 255 Structure 257 Structure 300 Vibration-proof member

Claims

1. A vibration-isolating structure comprising a vibration-isolating member and support members joined to both axial sides of the vibration-isolating member and arranged coaxially, the axial rigidity of the vibration-isolating member is smaller than the axial rigidity of the support member, The bending rigidity and shear rigidity of the vibration-damping member are equal to or greater than the bending rigidity and shear rigidity of the support member. Vibration-proof structure.

2. The vibration-isolating member is a cylindrical body having an internal shaft portion joined to one of the support members and connected to the other support member; a plurality of face materials provided at intervals in the axial direction within the cylindrical body, the face materials having central portions joined to the shaft portion and outer peripheral portions joined to the inner peripheral surface of the cylindrical body; It has The vibration-isolating structure of claim 1.

3. The vibration-damping member is a lightened structure having anisotropic rigidity, in which the axial rigidity is smaller than that of the support member, and the bending rigidity and shear rigidity are equal to or greater than those of the support member. The vibration-isolating structure according to claim 1 .

4. The vibration-damping member is made of resin and elastically deforms in the axial direction. The vibration-proof structure according to any one of claims 1 to 3.

5. The support members are upper and lower hanging members that constitute the hanging member, The vibration-proof structure according to any one of claims 1 to 4.

6. The support members are bolts, an upper frame, and a lower frame that constitute the vibration isolation device. The vibration-proof structure according to any one of claims 1 to 4.

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