Vibration suppression device and ceiling structure of building

Abstract

To provide a vibration suppression device capable of easily enhancing an effect of suppressing vibration of a plate-like structural member, and a ceiling structure of a building.SOLUTION: A vibration suppression device 11 is attached to a partition structure of a building, and the partition structure of the building is provided with a plate-like structural member and a frame-like structural member to which the plate-like structural member is attached. The vibration suppression device 11 includes a weight member 12 and a weight support member 13 that supports the weight member 12. The weight support member 13 has a weight support body 31 having a longitudinal direction and a fixing part 32 fixed to the frame-shaped structural member. The fixing parts 32 are provided at both end parts in the longitudinal direction of the weight support body part 31. The weight support body part 31 has an intermediate part 31c disposed between the weight member 12 and the plate-shaped structural member. The intermediate part 31c has an opposing surface S1 facing the weight member 12 and a non-opposing surface S2 opposite to the facing surface S1. The non-opposing surface S2 has a contact part C in contact with the plate-like structure member.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to a vibration suppression device and a ceiling structure of a building.

Background Art

[0002] As described in Patent Document 1, a vibration suppression device may be attached to a partition structure that separates an upper floor and a lower floor of a building.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The partition structure of the building as described above includes a plate-shaped structural member and a frame-shaped structural member to which the plate-shaped structural member is attached. There is still room for improvement from the viewpoint of enhancing the effect of suppressing the vibration of the plate-shaped structural member of such a partition structure by a vibration suppression device.

[0005] Therefore, an object of the present invention is to provide a vibration suppression device that can easily enhance the effect of suppressing the vibration of a plate-shaped structural member, and a ceiling structure of a building.

Means for Solving the Problems

[0006] Each aspect of the vibration suppression device and the ceiling structure of the building that solve the above problems will be described. The vibration suppression device of Mode 1 is a vibration suppression device attached to a partition structure of a building, comprising a plate-shaped structural member and a frame-shaped structural member to which the plate-shaped structural member is attached, and includes a weight member and a weight support member for supporting the weight member. The weight support member has a weight support main body portion having a longitudinal direction, and fixing portions provided at both ends in the longitudinal direction of the weight support main body portion and fixed to the frame-shaped structural member. The weight support main body portion has an intermediate portion disposed between the weight member and the plate-shaped structural member. The intermediate portion has a facing surface facing the weight member and a non-facing surface on the opposite side of the facing surface. The non-facing surface has a contact portion that contacts the plate-shaped structural member.

[0007] According to this configuration, by fixing the weight support main body portion to the frame-shaped structural member using the fixing portion of the weight support member, the vibration suppression device can be attached to the partition structure of the building with the contact portion in contact with the plate-shaped structural member. In the vibration suppression device attached in this way, the vibration of the plate-shaped structural member can be directly transmitted to the intermediate portion by the contact portion. The vibration transmitted to the intermediate portion can be efficiently suppressed by the weight member disposed facing the facing surface of the intermediate portion.

[0008] In the vibration suppression device of Mode 2, in Mode 1, the weight member may have a shape that protrudes from the facing surface in a direction intersecting the longitudinal direction of the weight support main body portion in a plan view with the facing surface of the intermediate portion facing upward.

[0009] According to this configuration, for example, it becomes possible to easily arrange a weight member with a larger volume. Therefore, for example, by increasing the mass of the weight member, it becomes possible to easily enhance the effect of suppressing the vibration of the plate-shaped structural member.

[0010] In the vibration suppression device of Mode 3, in Mode 1 or Mode 2, the intermediate part has an intermediate main body part and a soft part made of a material softer than the material constituting the intermediate main body part, and the contact part may be made of the soft part. According to this configuration, for example, it is possible to enhance the effect of suppressing the vibration of the plate-like structural member by the flexibility of the soft part.

[0011] In the vibration suppression device of Mode 4, in Mode 3, the contact part may have adhesiveness or adhesivity. According to this configuration, the contact part can be adhered or bonded to the plate-like structural member. As a result, the vibration of the plate-like structural member is easily transmitted to the intermediate part, making it possible to enhance the effect of suppressing the vibration of the plate-like structural member.

[0012] The ceiling structure of a building in Mode 5 is a ceiling structure of a building including a ceiling structure of a building and a vibration suppression device attached to the ceiling structure. The ceiling structure includes a ceiling board and a frame-shaped structural member to which the ceiling board is attached. The vibration suppression device includes a weight member and a weight support member that supports the weight member. The weight support member has a weight support main body part having a longitudinal direction and fixing parts provided at both ends in the longitudinal direction of the weight support main body part and fixed to the frame-shaped structural member. The weight support main body part has an intermediate part disposed between the weight member and the ceiling board. The intermediate part has an opposing surface facing the weight member and a non-opposing surface on the opposite side of the opposing surface. The non-opposing surface has a contact part that contacts the ceiling board.

[0013] According to this configuration, the vibration of the ceiling board can be directly transmitted to the intermediate part by the contact part. The vibration transmitted to the intermediate part can be efficiently suppressed by the weight member disposed facing the opposing surface of the intermediate part.

Effect of the Invention

[0014] According to the present invention, it is possible to easily enhance the effect of suppressing the vibration of the plate-like structural member.

Brief Description of the Drawings

[0015]

Figure 1

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Figure 3

Figure 4

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Figure 11

DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, an embodiment of a vibration suppression device and a ceiling structure of a building will be described with reference to the drawings. As shown in FIGS. 1 to 3, the vibration suppression device 11 is used for suppressing the vibration of the partition structure 51 of a building by being attached to the partition structure 51 of the building.

[0017] <Partition structure 51 of the building> The partition structure 51 of the building includes a plate-shaped structural member 52 and a frame-shaped structural member 53 to which the plate-shaped structural member 52 is attached. The frame-shaped structural member 53 includes a plurality of rod-shaped structural members 53a spaced apart so as to extend parallel to each other, and a plurality of support structural members 53b that support the plurality of rod-shaped structural members 53a. The plurality of support structural members 53b are spaced apart so as to extend parallel to each other. The end portions of the rod-shaped structural members 53a are fixed to the support structural members 53b. The support structural member 53b has a longitudinal direction extending along a direction intersecting the longitudinal direction of the rod-shaped structural member 53a in plan view. In the present embodiment, the support structural member 53b is arranged so as to extend along a direction orthogonal to the direction in which the rod-shaped structural member 53a extends.

[0018] In the XYZ axes in the drawing, the X-axis represents the horizontal direction along the extending direction of the rod-shaped structural member 53a, the Y-axis represents the horizontal direction along the extending direction of the support structural member 53b and orthogonal to the X-axis, and the Z-axis represents the upward direction orthogonal to the XY plane.

[0019] The partition structure 51 of the building may include three or more rod-shaped structural members 53a. The support structural member 53b of the partition structure 51 of the building may include three or more support structural members 53b.

[0020] In the present embodiment, as an example of the partition structure 51 of the building, a ceiling structure of the building is shown. The ceiling structure of the building includes a ceiling structure of the building and a vibration suppression device 11 attached to this ceiling structure. The plate-shaped structural member 52 in the ceiling structure of the building is a ceiling board. In the ceiling structure of the building, the rod-shaped structural member 53a of the frame-shaped structural member 53 is, for example, a soffit. Also, in the ceiling structure of the building, the support structural member 53b of the frame-shaped structural member 53 is, for example, a soffit support. The support structural member 53b is suspended from the building body, for example, by being attached to a suspension member attached to the building body.

[0021] Examples of the plate-shaped structural member 52 include a gypsum board, a calcium silicate board, a wood-based board, and the like. Examples of the materials for the rod-shaped structural member 53a and the support structural member 53b include metal-based materials such as steel materials and wood-based materials.

[0022] <Vibration suppression device 11> As shown in FIGS. 4 and 5, the vibration suppression device 11 includes a weight member 12 and a weight support member 13 that supports the weight member 12.

[0023] The weight support member 13 has a weight support main body portion 31 having a longitudinal direction and a fixing portion 32 fixed to the frame-shaped structural member 53. The fixing portion 32 has a first fixing portion 32a and a second fixing portion 32b connected to both ends of the weight support main body portion 31.

[0024] As shown in FIGS. 3 to 5, the weight support main body portion 31 has a first connecting portion 31a, a second connecting portion 31b, and an intermediate portion 31c. The first connecting portion 31a connects the intermediate portion 31c and the first fixing portion 32a. The second connecting portion 31b connects the intermediate portion 31c and the second fixing portion 32b. The intermediate portion 31c is disposed between the weight member 12 and the plate-shaped structural member 52.

[0025] The intermediate portion 31c has a facing surface S1 facing the weight member 12 and a non-facing surface S2 on the opposite side of the facing surface S1. The non-facing surface S2 has a contact portion C that contacts the plate-shaped structural member 52. The contact portion C is a portion that preferentially contacts the plate-shaped structural member 52 compared to other portions of the weight support main body portion 31 other than the contact portion C.

[0026] The intermediate portion 31c has an intermediate main body portion M1 and a soft portion M2 made of a material softer than the material constituting the intermediate main body portion M1. The soft portion M2 is more easily compressed and deformed than the intermediate main body portion M1. The contact portion C is formed of the soft portion M2.

[0027] The intermediate main body M1 is made of, for example, a metal material. Examples of the metal material include steel and stainless steel. The intermediate main body M1, the first connecting portion 31a, and the second connecting portion 31b are integrally formed of the same material. In the hammer support member 13 of the present embodiment, portions other than the soft portion M2, that is, the first connecting portion 31a, the second connecting portion 31b, the intermediate main body M1, and the fixing portion 32 are integrally formed of the same material.

[0028] Examples of the material constituting the soft portion M2 include resin-based materials and rubber-based materials. Examples of the resin-based materials include styrene-based resins, olefin-based resins, ester-based resins, urethane-based resins, amide-based resins, and vinyl chloride-based resins. Examples of the rubber-based materials include natural rubber, polyisoprene rubber, styrene-butadiene rubber, polybutadiene rubber, nitrile rubber, butyl rubber, ethylene propylene rubber, urethane rubber, silicone rubber, various elastomers, and gels. The material constituting the soft portion M2 may contain a filler, a plasticizer, etc. as necessary. The soft portion M2 can be formed of, for example, a sheet material.

[0029] The contact portion C preferably has adhesiveness or adhesivity. For example, by forming the soft portion M2 from butyl rubber having adhesiveness or urethane gel having self-adhesiveness, adhesiveness can be imparted to the contact portion C. Note that the soft portion M2 can also be formed of a laminate including a first soft layer having non-adhesiveness or non-adhesivity and a second soft layer having adhesiveness or adhesivity. For example, the soft portion M2 may be formed of a laminate in which the second soft layer, the first soft layer, and the second soft layer are laminated in this order.

[0030] The weight support main body portion 31 of this embodiment has a curved portion B. The curved portion B is formed so as to bulge toward the plate-like structural member 52. More specifically, the curved portion B is formed in the intermediate portion 31c. The curved portion B has a pair of side walls extending toward the plate-like structural member 52 and a tip wall connecting the tip ends of the pair of side walls. The curved portion B has a concave shape formed by the pair of side walls and the tip wall. The tip wall of the curved portion B has an intermediate main body portion M1 and a soft portion M2. That is, the tip wall of the curved portion B has a contact portion C. The weight member 12 is disposed at a distance from the tip wall of the curved portion B.

[0031] The first fixing portion 32a and the second fixing portion 32b of the weight support member 13 are provided at both longitudinal ends of the weight support main body portion 31. The fixing portion 32 can be fixed to the frame-like structural member 53 using a fastening member such as a screw. The first fixing portion 32a and the second fixing portion 32b of this embodiment are respectively fixed to a pair of rod-like structural members 53a disposed opposite to each other in the frame-like structural member 53.

[0032] The weight member 12 can be attached to the weight support main body portion 31 using a fastening member such as a screw. The weight member 12 can also be attached to the weight support main body portion 31 using an adhesive portion, a welded portion, or the like.

[0033] In a plan view with the opposing surface S1 of the intermediate portion 31c facing upward (in the Z-axis direction), the weight member 12 has a shape that protrudes from the opposing surface S1 of the intermediate portion 31c in a direction intersecting the longitudinal direction of the weight support main body portion 31. In other words, in the above plan view, the maximum value of the width dimension of the weight member 12 is larger than the maximum value of the width dimension of the weight support main body portion 31. The width dimension referred to here is the dimension in the direction orthogonal to the longitudinal direction of the weight support main body portion 31 in the above plan view, that is, the dimension along the X-axis.

[0034] The shape of the weight member 12 is, for example, a polyhedron shape having a plurality of outer surfaces. The shape of the weight member 12 of this embodiment is a hexahedron. Examples of the material of the weight member 12 include metal materials such as steel.

[0035] The mass W1 of the weight support member 13 is preferably smaller than the mass W2 of the weight member 12 from the viewpoint of enhancing the function of suppressing vibration. More preferably, the mass W1 of the weight support member 13 and the mass W2 of the weight member 12 satisfy the relationship of W1 ≦ 0.5 × W2, and even more preferably, satisfy the relationship of W1 ≦ 0.3 × W2.

[0036] The mass W1 of the weight support member 13 and the mass W2 of the weight member 12 preferably satisfy the relationship of 0.01 × W2 ≦ W1, and more preferably satisfy the relationship of 0.025 × W2 ≦ W1. The mass W2 of the weight member 12 is preferably in the range of, for example, 1 kg or more and 4 kg or less, and more preferably in the range of 2 kg or more and 3 kg or less. In this case, for example, it is possible to suppress the load applied to the frame-shaped structural member 53 and enhance the effect of suppressing the vibration of the plate-shaped structural member 52.

[0037] <Mounting method of the vibration suppression device 11 and usage state of the vibration suppression device 11> Next, an example of a mounting method for mounting the vibration suppression device 11 to the partition structure 51 of a building will be described. To mount the vibration suppression device 11 to the partition structure 51 of a building, first, an intermediate portion 31c of the weight support main body portion 31 is formed. That is, a sheet material that becomes the soft portion M2 is attached to the intermediate main body portion M1, thereby forming an intermediate portion 31c in which the intermediate main body portion M1 and the soft portion M2 are laminated. Next, the fixing portion 32 of the weight support member 13 is fixed to the frame-shaped structural member 53. Subsequently, after attaching the weight member 12 to the weight support main body portion 31, the plate-shaped structural member 52 is fixed to the rod-shaped structural member 53a of the frame-shaped structural member 53.

[0038] The mounting method for mounting the vibration suppression device 11 to the partition structure 51 of a building is not limited to the above method. For example, after attaching the weight member 12 to the weight support main body portion 31, the fixing portion 32 of the weight support member 13 may be fixed to the frame-shaped structural member 53.

[0039] Next, the usage state of the vibration suppression device 11 will be described. The vibration of the frame-shaped structural member 53 in the partition structure 51 of the building is transmitted to the weight support main body portion 31 via the fixing portion 32. The vibration of the plate-shaped structural member 52 in the partition structure 51 of the building is directly transmitted to the intermediate portion 31c by the contact portion C. The weight support main body portion 31 and the weight member 12 attenuate the vibration transmitted from the partition structure 51 of the building to the weight support main body portion 31. Thereby, the vibration of the partition structure 51 of the building can be suppressed.

[0040] <Actions and Effects of the Present Embodiment> Next, the actions and effects of the present embodiment will be described. (1) The vibration suppression device 11 attached to the partition structure 51 of the building includes a weight member 12 and a weight support member 13 that supports the weight member 12. The weight support member 13 has a weight support main body portion 31 having a longitudinal direction, and fixing portions 32 provided at both longitudinal ends of the weight support main body portion 31 and fixed to the frame-shaped structural member 53. The weight support main body portion 31 has an intermediate portion 31c disposed between the weight member 12 and the plate-shaped structural member 52. The intermediate portion 31c has an opposing surface S1 facing the weight member 12 and a non-opposing surface S2 on the side opposite to the opposing surface S1. The non-opposing surface S2 has a contact portion C that contacts the plate-shaped structural member 52.

[0041] According to this configuration, by fixing the weight support main body portion 31 to the frame-shaped structural member 53 using the fixing portion 32 of the weight support member 13, the vibration suppression device 11 can be attached to the partition structure 51 of the building with the contact portion C in contact with the plate-shaped structural member 52. In the vibration suppression device 11 attached in this way, the vibration of the plate-shaped structural member 52 can be directly transmitted to the intermediate portion 31c by the contact portion C. The vibration transmitted to the intermediate portion 31c can be efficiently suppressed by the weight member 12 disposed facing the opposing surface S1 of the intermediate portion 31c. Therefore, it is possible to easily enhance the effect of suppressing the vibration of the plate-shaped structural member 52.

[0042] (2) In a plan view with the opposing surface S1 of the intermediate portion 31c facing upward, the weight member 12 of the vibration suppression device 11 has a shape that protrudes from the opposing surface S1 in a direction intersecting the longitudinal direction of the weight support main body portion 31. In this case, for example, it becomes possible to easily arrange a weight member 12 with a larger volume. Therefore, for example, by increasing the mass of the weight member 12, it becomes possible to easily enhance the effect of suppressing the vibration of the plate-like structural member 52.

[0043] (3) The intermediate portion 31c of the weight support main body portion 31 has an intermediate main body portion M1 and a soft portion M2 made of a material softer than the material constituting the intermediate main body portion M1. The contact portion C is constituted by the soft portion M2. In this case, for example, it becomes possible to enhance the effect of suppressing the vibration of the plate-like structural member 52 due to the flexibility of the soft portion M2.

[0044] (4) In the intermediate portion 31c of the weight support main body portion 31, the contact portion C of the non-opposing surface S2 may have adhesiveness or adhesivity. In this case, the contact portion C can be adhered or bonded to the plate-like structural member 52. As a result, since the vibration of the plate-like structural member 52 is easily transmitted to the intermediate portion 31c, it becomes possible to enhance the effect of suppressing the vibration of the plate-like structural member 52.

[0045] (5) The weight support member 13 has a bent portion B. In this case, for example, it becomes possible to attenuate vibration by utilizing the elastic deformation of the bent portion B of the weight support member 13. Therefore, it becomes possible to further enhance the effect of suppressing the vibration of the plate-like structural member 52.

[0046] <Modification Example> The above embodiment may be modified and configured as follows. The above embodiment and the following modification examples can be implemented in combination with each other within a technically non-conflicting range.

[0047] · As shown in FIGS. 6 and 7, the weight member 12 can also be arranged in contact with the tip wall of the bent portion B of the weight support main body portion 31. · The above-mentioned weight member 12 has a shape that protrudes from the opposing surface S1 in both directions intersecting the longitudinal direction of the weight support main body portion 31 in a plan view with the opposing surface S1 of the intermediate portion 31c facing upward, but is not limited thereto. The shape of the weight member 12 can also be changed to a shape that protrudes in one direction out of the two directions intersecting the longitudinal direction of the weight support main body portion 31 from the opposing surface S1 in the above-mentioned plan view. Further, the shape of the weight member 12 can also be changed to a shape that does not protrude in any direction out of the two directions intersecting the longitudinal direction of the weight support main body portion 31 from the opposing surface S1 in the above-mentioned plan view.

[0048] However, from the viewpoint of enhancing the effect of suppressing vibration, the shape of the weight member 12 is preferably a shape that protrudes from the opposing surface S1 in both directions intersecting the longitudinal direction of the weight support main body portion 31 in the above-mentioned plan view. Further, the shape of the weight member 12 protruding in the above-mentioned two directions is more preferably a shape that is axisymmetric with respect to the axis along the longitudinal direction of the weight support main body portion 31 as the target axis in the above-mentioned plan view.

[0049] · The shape of the weight member 12 is not limited to a polyhedral shape, and for example, it may be spherical, or may be cylindrical as shown in FIGS. 8 and 9. · The weight support main body portion 31 and the fixing portion 32 may be made of the same material as each other, or may be made of different materials from each other. For example, in the vibration suppression device 11 shown in FIGS. 8 and 9, in the weight support main body portion 31, portions other than the soft portion M2 are made of a wood material, and the fixing portion 32 is made of a metal material.

[0050] · The above-mentioned weight support main body portion 31 has a bent portion B, but as shown in FIGS. 8 and 9, the bent portion B of the weight support main body portion 31 can also be omitted. · The shape of the above-mentioned weight support main body portion 31 is plate-shaped, but is not limited thereto. For example, as shown in FIGS. 8 and 9, the shape of the weight support main body portion 31 may be quadrangular columnar, or may be cylindrical as shown in FIGS. 10 and 11. Further, the shape of the weight support main body portion 31 may be tubular having a hollow portion extending along the longitudinal direction.

[0051] · The soft part M2 in the middle part 31c of the hammer support main body part 31 is arranged so as to be laminated on the lower surface of the middle main body part M1, but it may be arranged so as to be wound around the outer peripheral surface of the middle main body part M1.

[0052] · The soft part M2 in the middle part 31c of the hammer support main body part 31 may be omitted. That is, for example, as shown in FIGS. 10 and 11, the middle part 31c can also be composed of only the middle main body part M1.

[0053] · The fixing part 32 of the hammer support member 13 is fixed to the frame-shaped structural member 53 using a fastening member, but it may be fixed to the frame-shaped structural member 53 using an adhesive part, a welding part, or the like. · The first fixing part 32a and the second fixing part 32b of the hammer support member 13 are fixed to the rod-shaped structural member 53a of the frame-shaped structural member 53, but they can also be changed to be fixed to the support structural member 53b of the frame-shaped structural member 53. Also, one of the first fixing part 32a and the second fixing part 32b of the hammer support member 13 in the vibration suppression device 11 can be fixed to the rod-shaped structural member 53a, and the other of the first fixing part 32a and the second fixing part 32b can be changed to be fixed to the support structural member 53b.

[0054] · In the above-described embodiment, the partition structure 51 of the building is exemplified by the ceiling structure of the building. However, the partition structure 51 of the building may be the wall structure of the building. That is, the plate-like structural member 52 can be changed to a wall panel, and the frame-like structural member 53 can also be changed so that the wall panel can be attached. More specifically, the frame-like structural member in the wall structure of the building includes a pair of first rod-like structural members that are spaced apart from each other in the horizontal direction and extend vertically. Further, the frame-like structural member includes a pair of second rod-like structural members provided so as to hold the upper ends and the lower ends of the pair of first rod-like structural members. The first rod-like structural member is, for example, a stud. The second rod-like structural member is, for example, a runner. The wall structure of the building includes, for example, a plurality of wall panels arranged so as to sandwich the frame-like structural member. The wall structure of the building includes the wall structure of the building and a vibration suppression device attached to the wall structure.

[0055] <Addendum> The technical idea understood from the above-described embodiment and modification examples will be described. (Addendum 1) A vibration suppression device in which the mass W1 of the weight support member is smaller than the mass W2 of the weight member.

[0056] (Addendum 2) The vibration suppression device according to Addendum 1, wherein the mass W1 of the weight support member and the mass W2 of the weight member satisfy the relationship W1 ≤ 0.5 × W2. (Addendum 3) The vibration suppression device according to Addendum 1 or Addendum 2, wherein the mass W1 of the weight support member and the mass W2 of the weight member satisfy the relationship 0.01 × W2 ≤ W1.

Explanation of Reference Numerals

[0057] 11... Vibration suppression device 12... Weight member 13... Weight support member 31... Weight support main body portion 31a... First connection portion 31b... Second connection portion 31c... Intermediate portion 32... Fixing portion 32a... First fixing portion 32b... Second fixing portion 51... Partition structure 52... Plate-shaped structural member 53... Frame-shaped structural member 53a... Rod-shaped structural member 53b... Support structural member B... Curved portion C... Contact portion M1... Intermediate main body portion M2... Soft portion S1... Opposing surface S2... Non-opposing surface

Claims

1. A vibration suppression device attached to a partition structure of a building, comprising a plate-like structural member and a frame-like structural member to which the plate-like structural member is attached, comprising a weight member and a weight support member for supporting the weight member, wherein the weight support member has a weight support main body portion having a longitudinal direction, and fixed portions provided at both ends in the longitudinal direction of the weight support main body portion and fixed to the frame-like structural member, the weight support main body portion has an intermediate portion disposed between the weight member and the plate-like structural member, the intermediate portion has an opposing surface facing the weight member and a non-opposing surface on the opposite side of the opposing surface, the non-opposing surface has a contact portion that contacts the plate-like structural member, the vibration suppression device.

2. The vibration suppression device according to claim 1, wherein the weight member has a shape that protrudes from the opposing surface in a direction intersecting the longitudinal direction of the weight support main body portion in a plan view with the opposing surface of the intermediate portion facing upward.

3. The intermediate portion has an intermediate main body portion and a soft portion made of a material softer than the material constituting the intermediate main body portion, the contact portion is composed of the soft portion, the vibration suppression device according to claim 1.

4. The vibration suppression device according to claim 3, wherein the contact portion has adhesiveness or adhesivity.

5. A ceiling structure of a building, comprising a ceiling structure of a building and a vibration suppression device attached to the ceiling structure, the ceiling structure includes a ceiling board and a frame-like structural member to which the ceiling board is attached, the vibration suppression device includes a weight member and a weight support member for supporting the weight member, the weight support member has a weight support main body portion having a longitudinal direction, and fixed portions provided at both ends in the longitudinal direction of the weight support main body portion and fixed to the frame-like structural member, the weight support main body portion has an intermediate portion disposed between the weight member and the ceiling board, the intermediate portion has an opposing surface facing the weight member and a non-opposing surface on the opposite side of the opposing surface, the non-opposing surface has a contact portion that contacts the ceiling board, the ceiling structure of the building.

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