JP5990838B2 - Suspension bolt vibration suppressor - Google Patents

Description

  The present invention relates to a vibration suppression body for a suspension bolt, and more particularly to a vibration suppression body that suppresses vibration of a suspension bolt that suspends a suspension structure such as an air conditioner or piping from a ceiling housing.

  Various equipment such as an indoor unit and piping of an air conditioner are arranged on a ceiling portion such as a ceiling slab or deck plate of a building such as a building. These equipments are generally supported on a ceiling by being fixed to a suspension bolt that is suspended and secured to a ceiling housing such as a ceiling slab or deck plate. For example, FIG. 11 shows an indoor unit of an air conditioner that is suspended from and supported by four suspension bolts, and the upper ends of the four suspension bolts are embedded and fixed to the ceiling frame using anchors or the like.

  These ceiling-supported structures (referred to as suspended structures in this specification) are configured so that damage to the building itself is avoided by the earthquake-resistant structure and vibration isolation mechanism of the building during an earthquake. However, it has not yet been possible to prevent the suspension structure suspended from the ceiling from shaking and vibrating.

  Therefore, a vibration load acts on the suspension bolt that suspends the suspension structure from the ceiling, and there is a problem that deformation or breakage may occur.

  According to the inventor's research, it has been found that deformation and breakage of the suspension bolt are often caused by stress concentration particularly at the root portion fixed to the ceiling frame.

  Therefore, instead of having a single suspension bolt, it is divided at the base portion, and a connecting member that allows vibration in the front and rear, left and right directions, etc. is interposed in this divided portion to avoid deformation and breakage of the suspension bolt at the root portion. The structure which performs is proposed (for example, refer patent document 1).

JP 2014-031694 A

  However, in the technique of Patent Document 1, although it is possible to prevent deformation and breakage at the base portion of the suspension bolt, particularly when a large shaking occurs, the suspension structure cannot be sufficiently protected and damaged, In severe cases, it may be dropped or dropped.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a vibration suppression body for a suspension bolt that can suppress vibration of the suspension bolt to prevent the suspension bolt from being deformed or damaged and can suppress the swing of the suspension structure.

  The present invention for solving the above problems has the following configuration.

1. In order to suspend a suspended structure such as an air conditioner or piping, it is attached to a suspension bolt suspended from a ceiling frame such as a ceiling slab or deck plate, and the vibration load acting on the suspension bolt is reduced to reduce vibration. In the vibration suppression body of the suspension bolt configured to suppress,
The vibration suppression body is made of an elastic plate material having elasticity ,
At least an upper portion of the elastic plate-like member comes into contact with the lower surface of the ceiling skeleton,
All the to part of from the top to the bottom of the elastic plate-like material, the hanger rod of the screw groove portion in contact with the above three locations of the outer periphery of, and in a polygon contact portion above the three positions to form In which the center of the suspension bolt is included,
When vibration energy is input to the suspension bolt, the vibration energy is suppressed or exerted by exerting a biasing force in a direction opposite to the vibration direction of the vibration energy input by the elasticity of the elastic plate member. To be extinguished,
A vibration suppression body for suspension bolts.

2. 2. The suspension bolt vibration suppressor according to 1 above, wherein an upper end and / or a lower end of a portion of the elastic plate-like material that contacts the outer periphery of the thread groove portion of the suspension bolt is in contact with a curved surface.

3. 3. The suspension bolt vibration suppressor according to claim 1 or 2, wherein an upper portion of the elastic plate-like material is configured to contact the lower surface of the ceiling casing without contacting the suspension bolt.

4). 3. The suspension bolt vibration suppressor according to claim 1 or 2, wherein an upper portion of the elastic plate-shaped material is in contact with the suspension bolt and abuts on a lower surface of the ceiling casing.

5. 5. The suspension bolt vibration suppressor according to any one of 1 to 4 above, wherein the elastic plate-like material is made of an elastic material.

6). 6. The suspension bolt vibration suppressor according to any one of 1 to 5 above, wherein the elastic plate-like material is configured to exhibit elasticity by adding an elastic material.

7). Any one of the above 1 to 6, wherein the position of the lower part of the elastic plate-like material in contact with the screw groove portion of the suspension bolt is a position near the upper portion of the portion where the suspension structure is attached to the suspension bolt. The vibration suppression body of the hanging bolt of crab.

8). The vibration suppression body for a suspension bolt according to any one of 1 to 7 above, wherein the vibration suppression body is configured to be attached to the suspension bolt by being attached from a side of the suspension bolt.

9. The vibration suppression body for a suspension bolt according to any one of the above 1 to 7, wherein the vibration suppression body is configured to be inserted from an end of the suspension bolt and attached to the suspension bolt.

10. At the position where the upper part of the plate-like body abuts at three or more opposite positions on the lower surface of the ceiling casing, and the center of the suspension bolt is included in a polygon formed by the three or more abutting places. 10. The suspension bolt vibration suppressor according to any one of 1 to 9, which has a configuration.

11. The vibration suppression body for a suspension bolt according to any one of 1 to 10 above, wherein the vibration suppression body is configured to be fixed to the ceiling casing.

12 The elastic plate-like material has a configuration in which a concave portion and / or a convex portion that meshes with a thread groove formed by a convex strip and a concave strip of the suspension bolt is provided in a portion that contacts the outer periphery of the suspension bolt. The vibration suppression body of the suspension bolt according to any one of 1 to 11 above.

  According to the first aspect of the present invention, it is possible to provide a suspension bolt vibration suppressing body capable of suppressing the vibration of the suspension bolt to prevent the suspension bolt from being deformed or damaged and suppressing the swing of the suspension structure. Can do.

In particular, it is input to the suspension bolt by a configuration in which the center of the suspension bolt is included in a polygon formed by a contact portion of the elastic plate-like material of the vibration suppression body on the outer periphery of the suspension bolt. Regardless of the direction of vibration energy of 360 degrees around the entire circumference, the urging force of the elastic plate-like material is exerted in the opposite direction to the vibration energy of the vibration energy, so that the vibration energy is suppressed or extinguished. Can do. Therefore, the load applied to the root portion of the suspension bolt can be remarkably reduced, and deformation and breakage of the suspension bolt can be prevented.

According to the second aspect of the present invention, since the contact end between the suspension bolt and the elastic plate-like material is in surface contact, stress concentration of vibration energy at the contact end can be avoided. It is possible to prevent the suspension bolt from being deformed or damaged not only at the root portion but also at the contact end.

According to the third aspect of the present invention, the vibration of the suspension bolt in a more stable state can be suppressed by the configuration in which the upper portion of the elastic plate-like material contacts the lower surface of the ceiling casing at a position away from the suspension bolt.

According to the invention shown in claim 4, stress concentration applied to the root portion of the suspension bolt is more effectively prevented by the configuration in which the upper portion of the elastic plate-like material is in contact with the lower surface of the ceiling casing in a state of being in contact with the suspension bolt. be able to.

According to the invention shown in claim 5, the vibration energy applied to the suspension bolt can be suppressed by the elasticity of the elastic plate-like material .

According to the sixth aspect of the present invention, the vibration energy applied to the suspension bolt can be suppressed by the elasticity of the elastic material added to the elastic plate-like material .

  According to the seventh aspect of the present invention, since vibration energy can be suppressed at a position close to the attachment position of the suspension structure, deformation and breakage of the suspension bolt can be further prevented.

  According to the eighth aspect of the present invention, the vibration suppressing body can be attached to the suspension bolt even after the suspension structure has already been attached to the suspension bolt.

  According to the ninth aspect of the present invention, it is possible to attach the vibration suppressing body to the suspension bolt in advance before attaching the suspension structure to the suspension bolt.

According to the tenth aspect of the present invention, the center of the suspension bolt is included in a polygon formed by three or more portions that contact the lower surface of the ceiling casing of the elastic plate member of the vibration suppressing body. With the structure of contact, the vibration suppression body can be brought into contact with the lower surface of the ceiling housing in a stable state regardless of the direction of vibration energy input to the suspension bolt in any direction of 360 degrees. Thus, vibration energy can be further suppressed or eliminated.

According to the invention shown in claim 11, since the vibration suppressing body is fixed to the lower surface of the ceiling casing, it is only necessary that at least one portion of the upper portion of the elastic plate-like material of the vibration suppressing body is in contact with the lower surface. .

According to the twelfth aspect of the present invention, the contact area of the vibration suppressing body with respect to the suspension bolt is increased, and the displacement of the contact portion of the plate-shaped body in the suspension bolt axial direction is suppressed. In addition, the suppression or elimination effect of vibration energy is significantly improved.
Further, due to the meshing of the contact portion between the suspension bolt and the elastic plate-like material , the urging force of the elastic plate-like material opposed to the vibration energy is added in the reverse direction of the vibration energy, and the spiral of the thread groove of the suspension bolt. Since it is also exhibited in the direction, the suppression or disappearance effect of vibration energy is further improved.

The side view (partial cross section) which shows one Example of the vibration suppression body of the suspension bolt which concerns on this invention The principal part end view which shows an example of the contact state of the elastic plate-shaped material of the vibration suppression body with respect to a suspension bolt Main part explanation end view showing a plurality of examples of contact positions of the vibration suppressing body with respect to the suspension bolt The principal part end view which shows an example of the contact state of the elastic plate-shaped material upper part of the vibration suppression body with respect to the lower surface of a ceiling frame Main part explanation end view showing a plurality of examples of contact positions of the upper part of the elastic plate-like material of the vibration suppressing body to the lower surface of the ceiling frame An explanatory side view showing another configuration example of the upper part of the elastic plate-like material of the vibration suppressing body (partial sectional view) An explanatory side view showing another embodiment of the contact portion of the elastic plate-like material of the vibration suppressing body with the suspension bolt Explanatory side view (partly sectional view) showing another embodiment of the abutting portion of the elastic plate-like material of the vibration suppressing body on the lower surface of the ceiling casing The principal part side view which shows the other Example of the contact part to the suspension bolt of the elastic plate-shaped material of a vibration suppression body Sectional drawing of the principal part which shows the other Example of the contact part to the suspension bolt of the elastic plate-shaped material of a vibration suppression body. Schematic explanatory perspective view showing an example of a ceiling support structure of a suspended structure

  Next, the present invention will be described with reference to the accompanying drawings.

The suspension bolt vibration suppression body (hereinafter also referred to as a vibration suppression body) according to the present invention suspends a suspension structure 4 such as an air conditioner or piping as shown in FIG. It is a technology that suppresses the vibration of the hanging bolts 3, 3, 3, 3 to be lowered, and as a specific configuration example, as shown in FIGS. 1 to 5,
In order to suspend a suspended structure, it is attached to a suspension bolt 3 suspended from a ceiling housing 2 such as a ceiling slab or deck plate, and the vibration load acting on the suspension bolt 3 is reduced to suppress the vibration. In the suspension bolt vibration suppression body 1,
The vibration suppressing body 1 is made of an elastic plate-like material 10 having elasticity ,
At least the upper 11 of the elastic plate-like member 10 comes into contact with the lower surface 21 of the roof skeleton 2,
All the through part to the lower 12 from the top 11 of the elastic plate-like member 10 (upper 11 in this embodiment shown in FIG. 1) comes into contact with the three or more locations on the outer periphery of the hanger rod 3, and its three The center 3A (FIG. 3) of the suspension bolt 3 is formed in a polygon (triangular in the present embodiment shown in FIG. 3) formed by the contact portions 13 at more than three places (three in the present embodiment shown in FIGS. 2 and 3). Reference)),
When vibration energy is input to the suspension bolt 3, the vibration energy is suppressed by exerting a biasing force in a direction opposite to the vibration direction of the vibration energy input by the elasticity of the elastic plate member 10. Or it is the structure which makes it disappear.

  Hereinafter, the vibration suppressing body 1 of the present invention will be described in more detail.

The elastic plate-like member 10 of the vibration suppressing body 1, the tube support it can be used a metal-synthetic resin are known and used materials used in the device, or the elastic plate-like member 10 itself is a material having elasticity Alternatively, a configuration in which another member having elasticity is added to the elastic plate-like material 10 may be employed. In this embodiment shown in FIGS. 1 to 5, an embodiment in which the elastic plate member 10 is formed of an elastic material is shown.

With the elastic plate-like material 10 processed, for example, by bending or bending similar to a pipe support band or the like, the upper portion 11 is in contact with the lower surface 21 of the ceiling casing 2 and the lower portion 12 is in contact with the suspension bolt 3 on the outer periphery. it can be mounted and fixed to the bolt 3 hanging vibration suppressing body 1 made of the elastic plate-like member 10.

In this embodiment, there are three contact portions 13 (reference numerals 13, 13, and 13) as shown in FIG. 2, and these three contact portions 13 are in contact with the outer periphery of the suspension bolt 3 of the elastic plate member 10 as shown in FIG. The center 3 </ b> A of the suspension bolt 3 is included in the triangle T <b> 3 formed by the abutting portions 13, 13, and 13. Since the center 3 A of the suspension bolt 3 is the center of gravity of the suspension bolt 3, vibrations input to the suspension bolt 3 by including this center 3 A in the triangle formed by the contact portions 13, 13, 13. Regardless of the direction of vibration of energy, the urging force of the elastic plate member 10 acts on the input vibrational energy in a direction opposite to the vibration direction. Can be extinguished.

In the embodiment shown in FIG. 2, the elastic plate-like material 10 is in contact with three locations on the outer periphery of the suspension bolt 3 at equal intervals, so that the triangle formed by the three contact portions 13, 13, 13 is formed. T3 is a regular triangle as shown in FIG. 3A, and the center 3A of the suspension bolt 3 is located at the center of the triangle T3. Therefore, the inelastic force of the elastic plate-like member 10 can be evenly exhibited regardless of the direction of vibration energy vibration in any direction around the 360-degree circumference of the suspension bolt 3.

  The polygon formed by the abutting portions 13, 13, and 13 that are the abutting portions is limited to the regular triangle of the above embodiment as long as the center 3 </ b> A of the suspension bolt 3 is included in the polygon. Alternatively, a triangle T3 other than a regular triangle may be used as shown in FIG. 3B, or four contact portions 13, 13, 13, 13 as shown in FIG. It may be a quadrangle T4 formed from However, as shown in FIG. 3 (d), in the configuration in which the center 3A of the suspension bolt 3 is not included in the triangle T3 formed by the contact portions 13, 13, and 13, the input is made so as to come out to the side that is not included. This is outside the scope of the present invention because it is not possible to exert an insensitive force against the vibration energy.

It is preferable that the upper end and the lower end of the contact portion 13 of the elastic plate member 10 of the vibration suppressing body 1 with the outer periphery of the suspension bolt 3 are in contact with each other as shown in FIG. According to such a configuration, the contact end of the contact portion 13 between the suspension bolt 3 and the elastic plate member 10 is in surface contact, so that stress concentration of vibration energy on the contact end can be avoided. In addition to the root portion of the suspension bolt 3, it is possible to prevent deformation and breakage of the suspension bolt 3 at the contact end.

As described above, the upper part 11 of the elastic plate member 10 contacts the lower surface 21 of the ceiling casing 2, and this contact is the same as the contact with the outer periphery of the suspension bolt 3 described above. Is in contact with at least three opposite positions of the lower surface 21 of the ceiling housing 2 and the center 3A of the suspension bolt 3 is included in a polygon formed by the three or more contact positions. It is preferable.

  In the present embodiment shown in FIGS. 4 and 5, there are three contact points (reference numerals 14, 14, and 14) as shown in FIG. 4, and as shown in FIG. The center 3A of the suspension bolt 3 is included in the triangle T3 formed by 14.14. Since the center 3A of the suspension bolt 3 is the center of gravity of the suspension bolt 3, the vibration input to the suspension bolt 3 by including the center 3A in the triangle formed by the contact portions 14, 14, and 14 is provided. Since the vibration suppressing body 1 can be brought into contact with the lower surface 21 of the ceiling housing 2 in a stable state regardless of the direction of vibration of the energy around 360 degrees, the vibration energy can be further suppressed or reduced. It can disappear.

In the embodiment shown in FIG. 4, the upper portions 11, 11, 11 of the elastic plate-like material 10 are in contact with the three positions of the lower surface 21 of the ceiling casing 2 at equal intervals. The triangle T3 formed from 14 and 14 is a regular triangle as shown in FIG. 5A, and the center 3A of the suspension bolt 3 is located at the center of the triangle T3. Accordingly, the contact of the vibration energy with the lower surface 21 of the ceiling housing 2 is even regardless of the direction of vibration of the suspension bolt 3 in any direction of the entire 360 degrees.

  Note that the polygon formed by the contact portions 14, 14, and 14 that are the contact locations is limited to the regular triangle of the above embodiment as long as the center 3 A of the suspension bolt 3 is included in the polygon. As shown in FIG. 5B, a triangle T3 other than an equilateral triangle may be used, and as shown in FIG. 3C, there are four contact portions as four contact portions 14, 14, 14, 14. It may be a quadrangle T4 formed from However, as shown in FIG. 3D, in the configuration in which the center 3A of the suspension bolt 3 is not included in the triangle T3 formed from the contact portions 14, 14, and 14, the input is made so as to come out to the side that is not included. Since the contact with the lower surface 21 becomes uneven with respect to the vibration energy applied, it becomes impossible to make contact in a stable state, which is outside the scope of the present invention.

In addition, in the Example shown in FIG.1, FIG4 and FIG.5, the structure which the upper part 11 of the elastic plate-shaped material 10 contact | abuts the lower surface 21 of the ceiling housing 2 without contacting the suspension bolt 3, ie, an elastic plate-shaped material. The upper part 11 of 10 is in contact with the lower surface 21 of the ceiling housing 2 at a position away from the suspension bolt 3, and with this structure, vibration of the suspension bolt in a more stable state can be suppressed.

  The vibration suppressing body of the present invention having the above-described configuration may be configured to be mounted from the side of the suspension bolt 3 when being mounted / attached to the suspension bolt 3 or inserted from the end (lower end) of the suspension bolt 3. It is good also as a structure attached by attaching.

  According to the configuration in which the vibration suppressing body 1 is mounted from the side of the suspension bolt 3, the vibration suppression body 1 can be attached even after the suspension structure 4 is already attached to the suspension bolt 3. According to the configuration in which the suspension structure 4 is inserted through the portion (lower end), the vibration suppressing body 1 can be attached to the suspension bolt 3 in advance before the suspension structure 4 is attached to the suspension bolt 3.

  As mentioned above, although the vibration suppression body of the suspension bolt based on this invention was demonstrated based on the Example, this invention is not limited to the said Example, Other aspects can be taken within the scope of the present invention.

For example, in the above embodiment, the upper portion 11 of the elastic plate-like material 10 is configured to contact the lower surface 21 of the ceiling casing 2 without contacting the suspension bolt 3, but the upper portion of the elastic plate-like material 10 as shown in FIG. It is good also as a structure contact | abutted to the lower surface 21 of the ceiling housing | casing 2 in the state which 11 contact | abutted to the suspension bolt 3. FIG. According to such a configuration, it is possible to more effectively prevent stress concentration on the root portion of the suspension bolt 3.

In the above embodiment, the elastic plate-like material 10 is made of an elastic material. However, as shown in FIG. 7, the elastic material 15 is added to the elastic plate-like material 10 to exert elasticity. Also good. Furthermore, the elastic material 15 can be added to the elastic plate-like material 10 made of an elastic material.

Examples of the material of the elastic material 15 include materials having a material structure such as synthetic rubber, natural rubber, soft synthetic resin, and mixtures thereof having elasticity, and materials having structural elasticity such as a coil spring and a plate spring. In the embodiment shown in FIG. 7, the material structure itself such as various rubbers shows a structure using an elastic material.

Further in the above embodiment, had a structure in which the top 11 of the elastic plate-like member 10 is brought into contact with the lower surface 21 of the ceiling skeleton 2 at a plurality of positions (FIGS. 3 and 4, three positions), the elastic plate as shown in FIG. 8 By adopting a configuration in which the upper portion 11 of the shaped material 10 is fixed to the lower surface 21 of the ceiling casing 2 by using a fixing means 5 such as a bolt, the number of contact points may be three or less (one in FIG. 8). it can.

Further, in the above embodiment, the contact surface of the elastic plate member 10 to the outer periphery of the suspension bolt 3 is a smooth surface, but as shown in FIG. 9, the contact portion 13 of the elastic plate member 10 to the outer periphery of the suspension bolt 3 is provided. In addition, a configuration in which a concave portion and / or a convex portion 16 that meshes with a thread groove including the convex strip and the concave strip of the suspension bolt 3 may be provided. According to this configuration, the contact area of the contact portion 13 of the vibration suppressing body 10 with respect to the suspension bolt 3 is increased, and the position of the contact portion 13 of the plate-like body 10 in the axial direction of the suspension bolt 3 is increased. Since the deviation is suppressed, the suppression or disappearance effect of vibration energy is remarkably improved.
Further, due to the engagement of the abutting portion 10 between the suspension bolt 3 and the elastic plate member 10, the urging force of the elastic plate member 10 opposed to the vibration energy is applied in the opposite direction of the vibration energy, and the suspension bolt 3 Therefore, the effect of suppressing or eliminating the vibration energy is further improved.

Further, the contact portion 13 of the elastic plate member 10 with the outer periphery of the suspension bolt 3 may be formed by cutting and forming a part of the lower portion 12 of the elastic plate member 10 as shown in FIG. Good.

Further, the position of contact with the suspension bolt 3 at the lower portion 12 of the elastic plate-like material 10 is a position near the upper part of the portion where the suspension structure 4 is attached to the suspension bolt 3 (position indicated by reference numeral 3B in FIG. 11). In this case, vibration energy at a position close to the attachment position of the suspension structure 4 can be reduced, so that deformation and breakage of the suspension bolt 3 can be further prevented.

  In addition, although the plate-shaped body 10 which comprises the vibration suppression body 1 may each be independently comprised, the contact | abutting to the lower surface 21 of the suspension bolt 3 or the ceiling housing 2 may be comprised continuously, or it is one member connected or connected. A configuration is preferred.

DESCRIPTION OF SYMBOLS 1 Vibration suppression body 10 Elastic plate-shaped material 11 Upper part 12 Lower part 13 Contact part with a suspension bolt 14 Contact part with the lower surface of a ceiling housing 15 Elastic material 16 Recessed part and / or convex part 2 Ceiling housing 21 Lower surface of a ceiling housing 3 Suspension bolt 3A Center of suspension bolt 3B Upper near position 4 Suspension structure 5 Fixing means

Claims (12)

In order to suspend a suspended structure such as an air conditioner or piping, it is attached to a suspension bolt suspended from a ceiling frame such as a ceiling slab or deck plate, and the vibration load acting on the suspension bolt is reduced to reduce vibration. In the vibration suppression body of the suspension bolt configured to suppress,
The vibration suppression body is made of an elastic plate material having elasticity ,
At least an upper portion of the elastic plate-like member comes into contact with the lower surface of the ceiling skeleton,
All the to part of from the top to the bottom of the elastic plate-like material, the hanger rod of the screw groove portion in contact with the above three locations of the outer periphery of, and in a polygon contact portion above the three positions to form In which the center of the suspension bolt is included,
When vibration energy is input to the suspension bolt, the vibration energy is suppressed or exerted by exerting a biasing force in a direction opposite to the vibration direction of the vibration energy input by the elasticity of the elastic plate member. To be extinguished,
A vibration suppression body for suspension bolts. 2. The suspension bolt vibration suppressor according to claim 1, wherein an upper end and / or a lower end of a portion of the elastic plate-like material that comes into contact with an outer periphery of a thread groove portion of the suspension bolt is in contact with a curved surface. 3. The suspension bolt vibration suppressor according to claim 1, wherein an upper portion of the elastic plate-like material is configured to contact the lower surface of the ceiling casing without contacting the suspension bolt. The suspension bolt vibration suppressor according to claim 1 or 2, wherein an upper portion of the elastic plate-shaped member is in contact with the suspension bolt and abuts on a lower surface of the ceiling casing. The vibration suppression body of a suspension bolt according to any one of claims 1 to 4, wherein the elastic plate-shaped material is formed of an elastic material. 6. The suspension bolt vibration suppressor according to any one of claims 1 to 5, wherein the elastic plate-like material is configured to exhibit elasticity by adding an elastic material. 7. The position of the lower part of the elastic plate-like material in contact with the thread groove portion of the suspension bolt is a position near the upper portion of the portion where the suspension structure is attached to the suspension bolt. The vibration suppression body of the suspension bolt in any one. The vibration suppression body for a suspension bolt according to any one of claims 1 to 7, wherein the vibration suppression body is configured to be attached to the suspension bolt by being attached from a side of the suspension bolt. The said vibration suppression body is a structure inserted through the edge part of the said suspension bolt, and being attached to this suspension bolt, The vibration suppression body of the suspension bolt in any one of Claims 1-7 characterized by the above-mentioned. A position where the upper part of the elastic plate-like material abuts at three or more opposite positions on the lower surface of the ceiling casing and the center of the suspension bolt is included in a polygon formed by the three or more abutting places. 10. The suspension bolt vibration suppressor according to claim 1, wherein the suspension bolt vibration suppressor is according to claim 1. The said vibration suppression body is the structure fixed to the said ceiling housing, The vibration suppression body of the suspension bolt in any one of Claims 1-10 characterized by the above-mentioned. The elastic plate-like material has a configuration in which a concave portion and / or a convex portion that meshes with a thread groove formed by a convex strip and a concave strip of the suspension bolt is provided in a portion that contacts the outer periphery of the suspension bolt. The vibration suppression body of the suspension bolt according to any one of claims 1 to 11.

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