JP5869309B2 - Ceiling suspended seismic reduction device - Google Patents

Description

  The present invention is used between a suspension bolt suspended from the ceiling or under the floor of a building and machinery and equipment such as a duct, piping or an air conditioner suspended and supported by the suspension bolt. The present invention relates to a seismic reduction device that ensures the safety of equipment to be protected during an earthquake by consuming the destructive kinetic energy received through movement within a limited shaking movement space or vibration freedom.

  As a method of laying machinery and equipment such as pipes, ducts or air conditioners (hereinafter referred to as “devices to be protected”) under the ceiling or under the floor of a building (hereinafter referred to as “ceilings”), it was suspended from the ceiling or the like. Conventionally, a suspension support is attached to the lower end of the suspension bolt, and the device to be protected is suspended and supported by this suspension support.

  Various vibrations are generated from the equipment to be protected (for example, in the case of pipes and ducts, vibration is generated by the flow of fluid, and in the case of air conditioners, vibrations are generated by motors, etc.). In order to prevent the vibration from being transmitted to the ceiling or the like via the suspension bolt, an anti-vibration device is interposed between the suspension bolt and the suspension support (see, for example, Patent Document 1). .

JP 2009-36289 A (FIG. 1)

  The protection target equipment suspended and supported by the suspension bolts at the lower ends of the suspension bolts suspended from the ceiling, etc., is connected to the ceiling etc. of the suspension bolts when it receives destructive kinetic energy from an earthquake. It swings greatly back and forth and right and left like a pendulum around the part (the part indicated by X in FIG. 1).

  At this time, excessive stress is intensively and repeatedly applied to the connection portion X of the suspension bolt with the ceiling, resulting in fatigue of the portion, breakage of the suspension bolt, and a problem that the protection target device falls. was there.

  The present invention has been made in view of such conventional problems, and even if an earthquake occurs, it is possible to reduce the application of intensive stress to the connection portion of the suspension bolt with the ceiling, etc. A suspended ceiling type seismic reduction device for the purpose of preventing breakage.

  According to the first aspect of the present invention, "the upper piece 12a provided with the elastic body mounting hole 12c and the upper piece 12a are arranged at a predetermined interval below the upper piece 12a. A ceiling-suspended vibration-reducing device 10 including a vibration-reducing device main body 12 including a lower piece 12b to which P is attached and an elastic body 14 attached to an elastic body attaching hole 12c of the upper piece 12a. The elastic body 14 has a diameter larger than that of the elastic body mounting hole 12c and is disposed on the upper surface side of the upper piece 12a. The elastic body 14 has a diameter larger than that of the elastic body mounting hole 12c and is formed on the lower surface side of the upper piece 12a. The lower elastic body 14b and the upper elastic body 14a and the lower elastic body 14b that are arranged are connected to each other by a connecting member 14c that is arranged in the elastic body mounting hole 12c. From the upper end of the body 14a The bolt insertion hole 14d reaching the lower end of the side elastic body 14b is formed, and the upper surface of the lower elastic body 14b in contact with the upper piece 12a is formed in a convex curved shape toward the upper piece 12a ". Features.

  According to the second aspect of the present invention, “a plate seat 20 made of a material having a smaller coefficient of friction than the elastic body 14 and having an upward bowl shape between the upper piece 12a and the lower elastic body 14b is further provided. It is characterized by being “interposed”.

  According to invention of Claims 1-2, when the protection object apparatus P receives the destructive kinetic energy by an earthquake and shakes back and forth and right and left, the seismic-reduction apparatus main body 12 will center on the connection part 14c of the elastic body 14. FIG. The pendulum can be freely rotated in accordance with the movement of the protection target device P. The kinetic energy generated when the protection target device P swings back and forth and right and left is effectively absorbed by the elastic body 14 and the vibration transmitted to the suspension bolt B is greatly reduced. Therefore, it is possible to reduce stress from being concentrated on the connection portion X of the suspension bolt B with the ceiling S, and to prevent the suspension bolt B from being broken.

  Then, as in the invention described in claim 2, a plate seat 20 made of a material having a smaller friction coefficient than the elastic body 14 (in other words, slippery) is provided between the upper piece 12a and the lower elastic body 14b. If provided, the rotational motion of the vibration damping device main body 12 can be performed more smoothly, so that undesired vibrations can be prevented from being transmitted to the elastic body 14, and as a result, the suspension bolt B can be broken. It is possible to more effectively prevent problems such as breakage and breakage.

It is a figure which shows the use condition of the ceiling suspension type | mold vibration isolator of one Example of this invention. It is a top view of an elastic body. It is a front view of an elastic body. It is a fragmentary sectional view showing a ceiling suspension type vibration isolator in an unloaded state. It is a fragmentary sectional view which shows a ceiling suspension type seismic reduction apparatus at the time of vibration generation. It is a fragmentary sectional view which shows the ceiling suspension type | mold vibration isolator of the 2nd Example in an unloaded state. It is a fragmentary sectional view which shows the ceiling suspension type | mold vibration isolator of 2nd Example at the time of vibration generation. 6 is a diagram showing a modification of the embodiment in FIG. It is a figure which shows another modification in the FIG. 6 Example.

  The present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing a usage state of a ceiling suspended vibration isolator 10 (hereinafter simply referred to as “vibrator 10”) according to a first embodiment of the present invention.

  As shown in this figure, the vibration damping device 10 of the present invention suspends and supports a suspension bolt B suspended from a ceiling or the like S and a protection target device (pipe is taken as an example in this embodiment) P. The seismic device main body 12 and the elastic body 14 are generally used.

  The vibration damping device main body 12 is a rectangular frame member. In this embodiment, a plate made of a rigid material such as a metal is bent into a rectangular frame shape, and ends thereof are overlapped on the upper surface side and welded together. It is formed by.

  An elastic body attaching hole 12c for attaching an elastic body 14 to be described later is formed in the upper piece 12a of the vibration damping device main body 12. The elastic body 14 is attached to the elastic body attaching hole 12c.

  In addition, a bolt insertion hole 12d for inserting a bolt Mb standing on the upper surface of the suspension support M is formed in the lower piece 12b arranged at a predetermined interval below the upper piece 12a. Is formed.

  The elastic body attaching hole 12c formed in the upper piece 12a is set to be slightly larger than the outer diameter of the connecting member 14c of the elastic body 14 described later, and the bolt insertion formed in the lower piece 12b. The common hole 12d is set slightly larger than the outer diameter of the bolt Mb.

  The elastic body 14 is a substantially bowl-shaped member made of an elastic material such as rubber (see FIGS. 2 to 3), and has a substantially spherical upper elastic body 14a with an upper end cut away, and an upper elastic body 14a. It has a substantially spherical lower elastic body 14b having a large diameter and a lower end cut out, and a substantially cylindrical connecting member 14c that connects the upper elastic body 14a and the lower elastic body 14b. The lower surface that is the surface in contact with the upper piece 12a of the upper elastic body 14a and the upper surface that is the surface in contact with the upper piece 12a of the lower elastic body 14b are formed in a convex spherical shape toward the upper piece 12a. It is configured.

  The elastic body 14 is formed with a bolt insertion hole 14d extending from the upper surface of the upper elastic body 14a to the lower surface of the lower elastic body 14b. A cylindrical pipe 14e made of an inelastic material such as hard resin is inserted. The inner diameter of the bolt insertion hole 14d is set to be slightly larger than the outer diameter of the ceiling suspension bolt B, and the inner side surface of the bolt insertion hole 14d and the inner side surface of the pipe 14e are flush with each other. Is formed.

  The elastic body 14 is attached to the vibration damping device main body 12 as follows. That is, the elastic body 14 is disposed below the upper piece 12a of the vibration damping device main body 12, and the small diameter upper elastic body 14a is sandwiched from the side to be bent into the elastic body mounting hole 12c of the upper piece 12a. The connecting member 14c is inserted into the elastic body mounting hole 12c (in other words, the upper piece 12a is sandwiched between the upper elastic body 14a and the lower elastic body 14b). Thereby, the assembly of the vibration damping device 10 is completed. Since the outer diameters of the upper elastic body 14a and the lower elastic body 14b are set larger than the inner diameter of the elastic body mounting hole 12c of the upper piece 12, the elastic body 14 falls out of the upper piece 12a during use. There is nothing.

  When using the vibration reducing device 10, the lower end of the suspension bolt B suspended from the ceiling S is inserted into the bolt insertion hole 14 d of the elastic body 14 and the nut N is screwed into the insertion end. Thus, the vertical position of the vibration isolator 10 is fixed.

  Next, the bolt Mb erected at the upper end of the suspension support M is inserted into the bolt insertion hole 12d of the lower piece 12b of the vibration damping device main body 12 and is suspended and supported by the suspension support M. After adjusting the height of the protection target device P, the nut N is screwed into the insertion end of the bolt Mb to fix the position.

  Thus, the suspension support of the protection target device P using the seismic reduction device 10 is completed. 4 is a partial cross-sectional view showing the state of the elastic body 14 in an unloaded state, and FIG. 5 shows a load on the elastic body 14 (more specifically, the lower elastic body 14b) due to the weight of the device P to be protected. It is a fragmentary sectional view which shows the state which started.

When a destructive kinetic energy is applied to the protection target device P due to an earthquake and the protection target device P is shaken in the horizontal direction, as shown by a two-dot chain line in FIG. It swings back and forth and right and left like a pendulum around the connecting member 14c . At this time, since the seismic reduction device main body 12 smoothly rotates about the connecting member 14c of the elastic body 14 described above, the kinetic energy generated when the protection target device P swings back and forth and right and left is suspended. It is transmitted to the elastic body 14 via the holding support M and the vibration damping device main body 12, and the vibration energy is effectively absorbed in the elastic body 14 and converted into thermal energy.

  Therefore, the vibration transmitted to the suspension bolt B is greatly reduced, and the stress applied to the connection portion X of the suspension bolt B with the ceiling S is reduced. As a result, the suspension bolt B can be prevented from being broken.

  As can be seen with reference to FIG. 5, in a state where a load is applied to the lower elastic body 14 b, the lower elastic body 14 b bends in the vertical direction according to the weight of the protection target device P. The amount of deflection changes according to the weight of the protection target device P. That is, as the weight of the protection target device P increases, the contact area between the upper elastic body 14b and the upper piece 12a increases, and a vibration absorption effect according to the weight of the protection target device P can be expected.

  In the present embodiment, since the elastic body 14 is made of an elastic material such as rubber, if the vibration isolator body 12 swings in a pendulum shape back and forth and left and right, the elastic body 14 and the vibration isolator body 12 The frictional force acting during the period is undesirably applied to the elastic body 14, and the vibration absorption effect in the elastic body 14 may be diminished.

  In order to solve such a problem, it is only necessary to prevent an undesired frictional force from being generated between the vibration reducing device main body 12 and the elastic body 14, and as an example for realizing this purpose, FIG. As shown in FIG. 7, the frictional force (static friction coefficient and dynamic friction coefficient) between the vibration isolator main body 12 and the upper elastic body 14a is made of a material (for example, metal) having a small friction force. The countersunk 20 formed in a bowl shape (convex spherical shape) can be provided.

  By providing such a pedestal 20, it is possible to prevent an undesired frictional force from being generated between the anti-vibration device main body 12 and the elastic body 14 when the anti-vibration device main body 12 swings in a pendulum shape. Undesirable vibrations can be prevented from being transmitted to B.

  The shape of the elastic body 14, particularly the shape of the lower elastic body 14 b, is set so that the upper surface portion in contact with the vibration damping device main body 12 (or the plate seat 20) moves away from the center toward the outside. The shape of the body part is not limited to the above-described embodiment.

  For example, as shown in FIG. 8 embodiment, the body portion may be cut out, or as shown in FIG. 9, the body portion may be formed in a bellows shape. When the body portion is formed in a bellows shape as shown in FIG. 9, the lower elastic body 14b is easily bent up and down, so that the vibration energy of the vibration isolator main body 12 can be absorbed more effectively.

DESCRIPTION OF SYMBOLS 10 ... Ceiling suspension type seismic-reduction device 12 ... Seismic-reduction-device main body 12a ... Upper piece 12b ... Lower piece 12c ... Elastic body attachment hole 12d ... Bolt insertion hole 14 ... Elastic body 14a ... Upper elastic body 14b ... Lower side Elastic body 14c ... Connecting member 14d ... Bolt insertion hole 14e ... Pipe 20 ... Dish seat B ... Hanging bolt M ... Hanging support Mb ... Bolt P ... Protected device S ... Ceiling X ... Boundary portion

Claims (2)

An anti-seismic device comprising: an upper piece provided with an elastic body mounting hole; and a lower piece disposed below the upper piece at a predetermined interval and to which a device to be protected is attached via a suspension support A ceiling-suspended seismic reduction device composed of an elastic body attached to the main body and the elastic body attaching hole of the upper piece,
The elastic body is arranged on the upper surface side of the upper piece with a diameter larger than that of the elastic body attachment hole, and is arranged on the lower surface side of the upper piece with a diameter larger than that of the elastic body attachment hole. The lower elastic body and the upper elastic body and the lower elastic body are connected to each other and are arranged in the elastic body mounting holes,
The elastic body is formed with a bolt insertion hole extending from the upper end of the upper elastic body to the lower end of the lower elastic body, and the upper surface of the lower elastic body in contact with the upper piece 12a is A ceiling-suspended seismic reduction device characterized in that it is formed in a convex curved shape facing a piece.   A dish seat made of a material having a smaller friction coefficient than that of the elastic body and formed in an upward bowl shape is further interposed between the upper piece and the lower elastic body. Item 2. The suspended ceiling type vibration isolator according to item 1.

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