JP2020101265A - Suspended object vibration control structure - Google Patents

Abstract

To effectively control vibration of a suspended object and reduce a size of an insertion hole bored in a ceiling material located below a slab from which the suspended object is suspended.SOLUTION: A suspended object vibration control structure 100 includes: a ceiling material 20 formed with an insertion hole 22 while having an interval below a slab 10; a rigid bar 110 inserted through the insertion hole 22 and having a lower end part 110A to which a lighting fitting 50 is connected; a support mechanism 150 for supporting the rigid bar 110 so as to oscillate about an intermediate part 110C between the lower end part 110A and an upper end part 110B of the rigid bar 110 as the rotation center thereof; and a damper 120 for damping oscillation of the rigid bar 110.SELECTED DRAWING: Figure 1

Description

The present invention relates to a suspension vibration damping structure.

A pendant such as a chandelier suspended from a slab of a building is not significantly dampened with respect to the sway of the hang-up, so it sways significantly during an earthquake, and this sway continues for a long time even after the earthquake.

Patent Literature 1 discloses a technique relating to a suspension vibration damping structure that reduces swinging of the suspension. In this prior art, a suspended object is connected to a lower end of a shaft-shaped member whose upper end is swingably suspended on a slab via a wire rod. An oscillating body is provided between the upper end and the lower end of the shaft-shaped member, and the vibration of the oscillating body is damped by the damping means.

Therefore, when the slab sways due to an earthquake, a strong wind, or the like, and the shaft-like member swings around the upper end portion as a fulcrum, the damping means damps the swinging of the rocking body provided on the shaft-like member. As a result, the swing of the shaft-shaped member is reduced, and as a result, the swing of the hanging object connected to the shaft-shaped member via the linear member is reduced.

JP, 2018-4046, A

In Patent Document 1, an insertion hole is formed in a ceiling material below a slab, and a wire rod, which is connected to a lower end portion of a shaft-shaped member and has a hanging member, is inserted into the insertion hole. The through hole of the ceiling material needs to have a size that does not interfere with the wire connected to the shaft-like member that swings around the upper end due to an earthquake or a strong wind.

However, if the insertion hole of the ceiling material is large, the designability is deteriorated. Therefore, it is required to make the insertion hole in the ceiling material under the slab small.

SUMMARY OF THE INVENTION In view of the above facts, the present invention has an object of effectively damping a hanging object and reducing a through hole in a ceiling material under a slab on which the hanging object is hung.

The first aspect is provided at a space below the slab, a ceiling member having an insertion hole formed therein, a shaft-shaped member which is inserted into the insertion hole, and a hung object is connected to a lower end portion thereof, and a structural member. A support means is provided for supporting the shaft-shaped member such that an intermediate portion between the lower end portion and the upper end portion of the shaft-shaped member swings about a center of rotation, and the swing of the shaft-shaped member is damped. And a damping means for controlling the suspension.

In the first aspect, when the shaft-shaped member, to which the suspended object is connected at the lower end, swings about the middle part as a center of rotation due to an earthquake or a strong wind, damping is imparted to the shaft-shaped member by the damping means, and as a result, the suspension is provided. Object shaking is reduced. Since the center of rotation when the shaft-shaped member swings is an intermediate portion between the lower end and the upper end of the shaft-shaped member, the insertion hole is more than the case where the shaft-shaped member swings with the upper end as the center of rotation. The swinging width of the shaft-shaped member at the position is reduced. Therefore, the insertion hole of the ceiling material through which the shaft member is inserted can be made small.

In a second aspect, the supporting means includes a spherical spherical surface portion provided in the intermediate portion of the shaft-shaped member, and a support member provided in the structural member and rotatably supporting the spherical surface portion. The suspension vibration damping structure according to the first aspect.

In the second aspect, the support member receives the load of the shaft-shaped member and the suspended object, and rotatably supports the intermediate portion of the shaft-shaped member. Therefore, the structure of the supporting means for rotatably supporting the intermediate portion of the shaft-shaped member is simple and the cost is low.

In a third aspect, the supporting means is fixed to the structural member, and a slider for movably supporting the upper end portion of the shaft-shaped member in a horizontal direction, and the slider fixed to the structural member, The suspension damping structure according to the first aspect, further comprising a support member that rotatably supports the intermediate portion so as to be vertically movable.

In the third aspect, the slider provided on the slab receives the load of the shaft-shaped member and the hanging object. Further, a supporting member provided on the slab rotatably supports an intermediate portion of the shaft-shaped member so as to be vertically movable. Therefore, the shaft-like member swings around the middle part as the center of rotation. The slider receives and bears the load of the shaft-shaped member and the hanging object. Therefore, it is possible to hang a hanging object having a large load.

According to the present invention, the insertion hole in the ceiling material under the slab on which the hanging object is hung can be made small.

(A) is a front view of the suspension vibration damping structure of 1st embodiment, (B) is a horizontal sectional view which followed the 1B-1B line of (A). (A) is a front view of the lighting fixture in a stationary state, and (B) is a front view of the lighting fixture in a swaying state. It is a front view of the suspension vibration damping structure of the 1st modification of 1st embodiment. It is a front view of the suspension damping structure of the 2nd modification of 1st embodiment. (A) is a front view of a suspension vibration damping structure of a second embodiment, (B) is a plan view of a slider, (C) is a horizontal sectional view taken along line 5C-5C of (A). is there. FIG. 1A is an enlarged vertical cross-sectional view taken along the X direction of a portion where the spherical plain bearing of FIG. 1 is provided, and FIG. 1B is an enlarged vertical cross-sectional view of the rigid rod of FIG. , (C) are plan views of a portion where a spherical plain bearing is provided. It is a front view which shows typically the suspension damping structure of a 1st comparative example. (A) is a front view of a suspension damping structure of a second comparative example, and (B) is a front view of a suspension damping structure of the present embodiment. 8A shows the relationship between the amplitude ratio and the standardized frequency when the specifications of the suspension damping structure of the second comparative example of FIG. 8A are set so as to satisfy the expression of [Equation 1]. 8B is a graph showing the amplitude ratio and the normalized frequency when the specifications of the suspension vibration damping structure of the present embodiment of FIG. 8B are set so as to satisfy the expression of [Equation 1]. It is a graph which shows the relationship with.

<First embodiment>
A suspended vibration damping structure according to the first embodiment of the present invention will be described. It should be noted that two directions orthogonal to the horizontal direction are defined as an X direction and a Y direction, which are indicated by an arrow X and an arrow Y, respectively. Further, a vertical direction orthogonal to the X direction and the Y direction is defined as a Z direction, and is indicated by an arrow Z.

[Construction]
As shown in FIG. 1A, the suspended-body vibration control structure 100 of the present embodiment includes a ceiling member 20, a rigid rod 110, a rigid plate 300, a support mechanism 150, and a damper 120, and is an example of a suspended object. A lighting device 50 such as a chandelier is hung.

The ceiling material 20 is provided below the slab 10 with a space, and an insertion hole 22 is formed.

The rigid rod 110 as an example of the shaft-shaped member is inserted through the insertion hole 22 of the ceiling member 20. The lighting fixture 50 is connected to the lower end portion 110A of the rigid rod 110. The lighting fixture 50 includes a wire rod 52 that is an example of a connecting member that is connected to the lower end portion 110A of the rigid rod 110, and a lighting unit 54 that is an example of a suspended body that is attached to the wire rod 52. ..

The support mechanism 150 as an example of the support means is provided in the slab 10 as an example of the structural member, and the intermediate portion 110C between the lower end portion 110A and the upper end portion 110B of the rigid rod 110 swings about the rotation center. The rigid bar 110 is supported. The intermediate portion 110C is located near the upper side of the insertion hole 22 of the ceiling material 20.

The support mechanism 150 has a spherical surface portion 112 and a support member 152. The spherical portion 112 is a hemispherical portion in which the lower half provided on the intermediate portion 110C of the rigid rod 110 is a spherical surface.

The supporting member 152 has four supporting portions 154 and a spherical plain bearing 160 supported by the supporting portions 154. The four support parts 154 are composed of an arm part 156 along the vertical direction and a horizontal part 158 extending in the horizontal direction from the lower end of the arm part 156, and have an L-shape. The upper ends of the arm portions 156 of the support portions 154 are fixed to the slab 10.

As shown in FIG. 1(B), the support portion 154 is located on both outer sides in the X direction and both outer sides in the Y direction with the insertion hole 22 (see FIG. 1(A)) interposed therebetween in a plan view viewed from the Z direction. It is arranged. In addition, in FIG. 1B, the rigid bar 110 is illustrated by a broken line.

As shown in FIG. 1A, the horizontal portions 158 of the four support portions 154 are arranged close to and above the ceiling material 20 and extend toward the insertion holes 22. The spherical plain bearing 160 is fixed to the tip of each horizontal portion 158. In the present embodiment, the spherical plain bearing 160 is bolted to the tip of the horizontal portion 158 of the support portion 154 (see also FIG. 6).

As shown in FIG. 6(A), a spherical plain bearing 160, which is an example of a bearing, has a spherical recessed seat 164 having a through hole 162 formed in the central portion (see also FIG. 6(C)). ). The diameter of the through hole 162 is expanded downward. Then, the rigid rod 110 is inserted into the through hole 162, and the spherical surface portion 112 of the intermediate portion 110C is fitted into the concave seat 164.

Therefore, as shown in FIGS. 6(A) and 6(B), the rigid rod 110 can swing about the spherical portion 112 of the intermediate portion 110C in the horizontal two directions of the X direction and the Y direction about the rotation center. Supported by. That is, as shown in FIGS. 2(A) and 2(B), the rigid rod 110 is supported so as to swing around the intermediate portion 110C located near the upper side of the insertion hole 22 of the ceiling material 20 as the center of rotation. ing.

As shown in FIG. 1B, four dampers 120 as an example of a damping unit are provided in this embodiment. As shown in FIGS. 1(A) and 1(B), the damper 120 is arranged along the horizontal direction, and one end of the damper 120 is attached to the upper end 110B of the rigid rod 110 (see FIG. 1A). And the other end is connected to the arm 156 of the support 154 via the ball joint 122.

A rigid plate 300, which is an example of a swing member, is provided between the upper end portion 110B and the intermediate portion 110C of the rigid rod 110. The rigid plate 300 of the present embodiment is a steel plate member having a rectangular shape in a plan view. In addition, by adjusting the size, mass, position, etc. of the rigid plate 300, the natural period of oscillation of the rigid rod 110 provided with the rigid plate 300 is tuned to the natural period of oscillation of the illumination unit 54 of the lighting fixture 50. I am making it.

Here, the above-mentioned "the natural period of oscillation of the rigid rod 110 provided with the rigid plate 300 is synchronized with the natural period of oscillation of the illumination unit 54 of the lighting fixture 50" will be described.

The above is to adjust the size, mass, position, etc. of the rigid plate 300 to adjust the natural periods of the first-order mode and the second-order mode of the vibration system including the rigid rod 110 and the lighting fixture 50, and based on the fixed point theory. By adjusting the damping coefficient of the damper 120 in a state where the amplitude ratios of the fixed points P and Q appearing in the transfer function are the same, a vibration characteristic in which the amplitude ratio of the fixed points P and Q is the maximum amplitude ratio on the transfer function is obtained. That is.

[Action and effect]
Next, the operation and effect of this embodiment will be described.

As shown in FIG. 2B, when the slab 10 shakes due to an earthquake, a strong wind, or the like, the rigid rod 110 to which the lighting fixture 50 is connected swings about the intermediate portion 110C as a rotation center. However, the damper 120 imparts damping to the rigid rod 110, and as a result, wobbling of the illuminating section 54 of the luminaire 50 is reduced. In addition, this reduces the duration of the shaking of the lighting unit 54 of the lighting device 50.

Note that, in FIG. 2B, the lighting fixture 50 swings along the X direction, but the present invention is not limited to this. The luminaire 50 may swing in any of the horizontal directions.

Since the rigid rod 110 swings around the intermediate portion 110C located near the upper side of the insertion hole 22 of the ceiling material 20, the swing width of the rigid rod 110 at the position of the insertion hole 22 is small. Therefore, the insertion hole 22 of the ceiling member 20 through which the rigid bar 110 is inserted can be made small. Therefore, deterioration of the design of the ceiling material 20 due to the formation of the insertion holes 22 is suppressed.

The insertion hole 22 may be closed with a closing member made of a material that allows the rigid rod 110 to swing. Even in that case, if the closing member is large, the designability is deteriorated. However, as described above, when the insertion hole 22 is small, the closing member is also small, so that the deterioration in design is suppressed.

Further, the supporting portion 154 receives the loads of the rigid rod 110 and the lighting fixture 50, and rotatably supports the intermediate portion 110C of the rigid rod 110. Therefore, the member that receives the load of the rigid rod 110 and the lighting fixture 50 and the member that rotatably supports the intermediate portion 110C have a simpler structure and are lower in cost than those of separate members.

Further, as shown in FIG. 2A, the distance L1 between the spherical portion 112 of the intermediate portion 110C, which is the rotation center of the rigid rod 110, and the lower end portion 110A of the rigid rod 110, and the intermediate point that is the rotation center of the rigid rod 110. The damping effect of the damper 120 can be adjusted by changing the ratio of the distance L2 between the spherical surface portion 112 of the portion 110C and the connecting position of the damper 120.

Here, the suspended-body damping structure 500 of the first comparative example shown in FIG. 7 will be described.

In the suspension vibration damping structure 500 of the first comparative example, a damper 560 is connected to the rigid bar 110 and the slab 10, and an upper end 110B of the rigid bar 110 is connected to the slab 10 via a ball joint 122. Therefore, the rigid bar 110 swings around the upper end 110B as the center of rotation. Therefore, the swing width of the lower end portion 110A to which the lighting fixture 50 is connected is large, and therefore the insertion hole 23 of the ceiling material 20 needs to be large. Therefore, the designability of the ceiling material 20 is greatly reduced by forming the insertion hole 23.

On the other hand, as shown in FIGS. 1 and 2, in the suspended-body damping structure 100 of the present embodiment, the rigid rod 110 rotates the intermediate portion 110C located near the upper side of the insertion hole 22 of the ceiling member 20. Since it swings about the center, the swing width of the rigid bar 110 at the position of the insertion hole 22 becomes smaller. Therefore, the insertion hole 22 of the ceiling member 20 through which the rigid rod 110 is inserted can be made smaller than the through hole 23 of the first comparative example (see FIG. 7).

In this embodiment, the rigid plate 300 is provided between the upper end 110B and the intermediate portion 110C of the rigid rod 110. Then, by adjusting the size, mass, position, and the like of the rigid plate 300, the natural period of rocking of the rigid rod 110 is tuned to the natural period of rocking of the illumination section 54 of the lighting fixture 50. Therefore, the shaking of the lighting unit 54 of the lighting fixture 50 is effectively suppressed.

Here, FIG. 8(B) is a front view of the suspended-body damping structure 100 of the present embodiment. Further, FIG. 8A is a front view of the suspension vibration damping structure 600 of the second comparative example in which the upper end portion 110B of the rigid rod 110 is the center of rotation. It should be noted that the attenuation means is not shown in FIGS. 8A and 8B.

Then, the specifications of the suspension vibration damping structure 600 of the second comparative example of FIG. 8A and the suspension vibration damping structure 100 of the present embodiment of FIG. 8B are the following tuning conditions of [Equation 1]. Is set to satisfy.

In [Equation 1],
I ₂ is the rotational moment of inertia of the rigid plate 300,
m ₁ is the mass of the lighting unit 54 of the lighting fixture 50,
m ₂ is the mass of the rigid plate 300,
G ₁ is the position of the center of gravity of the lighting unit 54 of the lighting fixture 50,
G ₂ is the position of the center of gravity of the rigid plate 300,
L ₁ is the distance between the connecting position K ₁ at which the wire rod 52 of the lighting fixture 50 is connected at the lower end 110A of the rigid rod 110 and the center of gravity G ₁ of the lighting unit 54 of the lighting fixture 50.
L ₂ is the distance between the connecting position K ₁ and the rotation center position K ₂ of the rigid bar 110,
L ₃ is the distance between the rotation center position K ₂ and the center of gravity position G ₂ of the rigid plate 300.

In the case of the present embodiment of FIG. 8B, the direction of the distance L ₃ is opposite, so −(minus) L ₃ is introduced in [Equation 1]. That is, if the distance is, for example, 200 mm, it is calculated as -200 mm.

The specifications of the suspension damping structures 100 and 600 are set so as to satisfy the tuning condition of [Equation 1], and the natural period of the swing of the rigid rod 110 is set to the swing of the illuminator 54 of the luminaire 50. By synchronizing with the natural period, it is possible to effectively reduce the shaking of the lighting unit 54 of the lighting fixture 50.

Then, in the case where the specifications are set so as to satisfy the tuning condition of [Equation 1] and the shake of the lighting unit 54 of the lighting fixture 50 is effectively reduced, the suspension of the second comparative example of FIG. it is possible to reduce the mass _{m 2} of the rigid plate 300 in FIG. 8 suspended matter damping structure 100 of the present embodiment (B) than the mass _{m 2} of the rigid plate 300 in the object damping structure 600. Therefore, this will be described next.

FIG. 9A shows the relationship between the normalized frequency and the amplitude ratio Z when the suspension vibration damping structure 600 of the second comparative example of FIG. 8A satisfies the tuning condition of [Equation 1]. It is a graph. Similarly, FIG. 9B shows the relationship between the normalized frequency and the amplitude ratio Z when the suspension vibration damping structure 100 of the present embodiment of FIG. 8B satisfies the tuning condition of [Equation 1]. It is a graph which shows.

Note that the normalized frequency f/f ₁ that is the horizontal axis of each graph is the case where it is assumed that the natural frequency f of the slab 10 is directly suspended from the luminaire 50 (without the rigid rod 110). Is a value (value obtained by normalizing f) divided by the natural frequency f1 of.

Further, the amplitude ratio Z is a displacement amplitude of a vibration component included in the displacement of the lighting unit 54 of the lighting fixture 50 with respect to the slab 10, where y ₀ is a displacement amplitude of the vibration component included in the displacement generated in the slab 10 during an earthquake. Is the ratio when y ₁ is set. When the tuning condition of [Equation 1] is satisfied, the amplitude ratio Z of the two fixed points P and Q based on the fixed point theory both have the same value, and the value is obtained by [Equation 2].

The analysis conditions and specifications of the suspension vibration damping structure 600 of the second comparative example of FIG. 8A are shown below.
m ₁ : 230 kg
m ₂ : 170 kg
L ₁ : 4000 mm
L ₂ : 500 mm
L ₃ : 200 mm

In addition, the analysis conditions and specifications of the suspended vibration damping structure 100 of the present embodiment of FIG. 8B are shown below. The mass m _{2 of the} rigid plate 300 is 85 kg, which is half the mass m ₂ of 170 kg that is the mass m ₂ of the rigid plate 300 of the suspended vibration damping structure 600 of the second comparative example of FIG. 8A described above. In addition, (L ₁ and m ₁ ) and the ceiling height of the lighting fixture 50 in both are the same. Note that the “ceiling height” is the distance between the slab 10 and the ceiling material 20.
m ₁ : 230 kg
m ₂ : 85 kg
L ₁ : 4000 mm
L ₂ : 100 mm
L _3: 200 mm ([Expression 1] and when substituted into Equation 2], -200 mm as mentioned above)

In the case 1 in the graphs of FIGS. 9A and 9B, the case where an attenuation coefficient that allows the value of the amplitude ratio of the fixed points P and Q of the transfer function to be the value of the maximum amplitude ratio on the transfer function is adopted. Case 2 is a case where the damping coefficient of the damper that is the damping means is infinite (∞), and Case 3 is a case where the damping coefficient of the damper that is the damping means is 0.

In case 1 of FIGS. 9A and 9B, the amplitude ratio Z at the fixed point positions (points P and Q) in the fixed point theory is approximately 4.7. That is, the amplitude ratio Z at the fixed point position when the mass m ₂ of the rigid plate 300 in the suspension vibration damping structure 600 of the second comparative example of FIG. 8A is 170 kg, and the present embodiment of FIG. 8B. The amplitude ratio Z at the fixed point position when the mass m ₂ of the rigid plate 300 in the suspended vibration control structure 100 is 85 kg is approximately the same as about 4.7.

Therefore, when the specifications are set so as to satisfy the tuning condition of [Equation 1] and the swing of the lighting unit 54 of the lighting fixture 50 is effectively reduced, the hanging object of the second comparative example in FIG. is possible to reduce the mass _{m 2} of the rigid plate 300 in suspended matter damping structure 100 of the present embodiment shown in FIG. 8 (B) than the mass _{m 2} of the rigid plate 300 in the vibration damping structure 600 (half in this example) it can.

[Modification]
Next, a modified example of the present embodiment will be described.

(First modification)
In the suspension vibration damping structure 102 shown in FIG. 3, the damper 120 is arranged obliquely with respect to the horizontal direction, one end of which is connected to the lower side of the upper end 110B of the rigid rod 110 via a ball joint 122, and the other. The ends are connected to the slab 10 via ball joints 122.

In the first modified example, the support portion 154 forming the support member 152 does not receive the reaction force of the damper 120, so that the rigidity can be reduced accordingly.

(Second modified example)
In the suspended-body damping structure 104 shown in FIG. 4, the arm portion 157 of the support portion 155 that constitutes the support member 153 of the support mechanism 151 extends obliquely from the slab 10 with respect to the vertical direction, and extends horizontally from the lower end of the arm portion 157. A horizontal portion 159 extends in the direction. The damper 120 is arranged along the horizontal direction, one end of which is connected to the upper end 110B of the rigid bar 110 via a ball joint 122, and the other end of which is connected to the fixing portion 130 provided on the slab 10 with the ball joint 122. Are connected through.

In the second modified example, the support portion 155 constituting the support member 153 does not receive the reaction force of the damper 120, so that the rigidity can be reduced accordingly. Further, since the damper 120 is arranged along the horizontal direction, it is possible to more effectively exert the damping force than the configuration in which the damper 120 is obliquely arranged as in the first modification.

<Second embodiment>
A suspended vibration damping structure according to a second embodiment of the present invention will be described. The same members as those in the first embodiment are designated by the same reference numerals, and overlapping description will be simplified or omitted.

[Construction]
As shown in FIG. 5A, the suspended-body vibration control structure 200 of the present embodiment includes a ceiling material 20, a rigid rod 110, a rigid plate 300, a support mechanism 250, and a damper 120. The rigid rod 110 is inserted into the insertion hole 22 of the ceiling material 20, and the lighting fixture 50 is connected to the lower end 110A.

The support mechanism 250 as an example of a support unit is provided on the slab 10 as an example of a structural member, and supports the rigid bar 110 so that the intermediate portion 110C of the rigid bar 110 swings about the rotation center. The support mechanism 250 has a slider 280 and a support member 252.

As shown in FIGS. 5A and 5B, the slider 280 is an XY linear slider in which a first linear slider 282 along the Y direction and a second linear slider 284 along the X direction are combined. is there. The slider 280 is fixed to the slab 10 as an example of a structural member, and supports the upper end portion 110B (see FIG. 5A) of the rigid rod 110 so as to be movable in two horizontal directions of the X direction and the Y direction. The slider 280 of this embodiment is provided with a first linear slider 282 along the Y direction and a second linear slider 284 along the X direction. A joining member 285 is attached to the second linear slider 284 on the lower side, and the rigid rod 110 is attached to the joining member 285.

As shown in FIG. 5A, the support member 252 has four support portions 154 and an annular member 260 provided on the support portion 154.

As shown in FIGS. 5A and 5C, the annular member 260 is fixed to the tip of the horizontal portion 158 of the support portion 154. Further, the rigid rod 110 is inserted into the hole 262 of the annular member 260. Therefore, the intermediate portion 110C of the rigid bar 110 is rotatably supported while allowing vertical movement. From another viewpoint, the intermediate portion 110C of the rigid rod 110 is movable in the vertical direction, but its movement is restricted in the two horizontal directions.

As shown in FIG. 5A, the damper 120 is arranged along the horizontal direction, one end of which is connected to the upper end 110B of the rigid rod 110 via a ball joint 122, and the other end of which is the support 154. It is connected to the arm 156 via a ball joint 122.

A rigid plate 300, which is an example of a swing member, is provided between the upper end portion 110B and the intermediate portion 110C of the rigid rod 110. By adjusting the size, mass, position, etc. of the rigid plate 300, the natural period of oscillation of the rigid rod 110 provided with the rigid plate 300 is tuned to the natural period of oscillation of the illumination unit 54 of the lighting fixture 50. There is.

[Action and effect]
Next, the operation and effect of this embodiment will be described.

When the slab 10 shakes due to an earthquake or a strong wind, the upper end 110B of the rigid rod 110 fixed to the slider 280 moves in the horizontal direction. An intermediate portion 110C of the rigid rod 110 is rotatably supported by a circular ring member 260 while allowing vertical movement (movable in the vertical direction, but movement is restricted in the two horizontal directions). ing). Therefore, the rigid rod 110 swings around the annular member 260. That is, the rigid rod 110 swings around the intermediate portion 110C, and the lighting fixture 50 swings. In the case of the present embodiment, the lower end 110A of the rigid rod 110 moves up and down due to the rocking of the rigid rod 110, and the lighting fixture 50 also moves up and down accordingly.

However, the damper 120 provides damping to the rigid rod 110, resulting in less sway of the luminaire 50. In addition, this reduces the duration of the shaking of the lighting unit 54 of the lighting device 50.

Further, in the present embodiment, by adjusting the size, mass, position and the like of the rigid plate 300 provided between the upper end portion 110B and the intermediate portion 110C of the rigid rod 110, the rocking of the rigid rod 110 is unique. The cycle is tuned to the natural cycle of the swing of the lighting unit 54 of the lighting fixture 50. Therefore, the shaking of the lighting unit 54 of the lighting fixture 50 is effectively suppressed.

Since the rigid rod 110 swings around the intermediate portion 110C located near the upper side of the insertion hole 22 of the ceiling member 20, the swing width of the rigid rod 110 at the position of the insertion hole 22 becomes small. Therefore, the insertion hole 22 of the ceiling member 20 through which the rigid bar 110 is inserted can be made small.

Therefore, deterioration of the design of the ceiling material 20 due to the formation of the insertion holes 22 is suppressed. Further, even when the rigid rod 110 closes the insertion hole 22 with a swingable closing member, deterioration in design is suppressed.

Further, since the slider 280 provided on the slab 10 receives the loads of the rigid rod 110 and the lighting fixture 50 and the supporting member 252 does not bear the load, the lighting fixture 50 having a large load can be hung.

In addition, the distance L1 (see FIG. 2A) between the position of the intermediate portion 110C, which is the center of rotation of the rigid rod 110, that is inserted through the annular member 260 and the lower end portion 110A of the rigid rod 110, and the rigid rod 110 The damping effect of the damper 120 is changed by changing the ratio of the distance L2 (see FIG. 2A) between the position where the intermediate member 110C, which is the rotation center, is inserted into the annular member 260 and the connecting position of the damper 120. Can be adjusted.

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

In the above-mentioned embodiment, the rigid plate 110 is provided with the rigid plate 300, but it is not limited to this. A swing member other than the rigid plate 300 may be provided on the rigid rod 110. Further, the rocking member such as the rigid plate 300 may not be provided on the rigid rod 110.

Further, in the above-described embodiment, the shaft-shaped member is the linear rigid rod 110, but it is not limited to this. A shaft-shaped member other than the rigid rod 110 may be used.

Further, in the above embodiment, the hanging object is the lighting fixture 50 such as a chandelier, but the hanging object is not limited to this. The hanging object may be an illumination, a speaker, an exhibition panel, an object, or the like. Further, in the above-described embodiment, the wire rod that constitutes the suspended object is connected to the lower end portion of the shaft-shaped member, but the present invention is not limited to this. The hanging object is composed of a connecting material other than the wire material (for example, a bar material or a hook) and the hanging body, and the connecting material other than the wire material may be connected to the lower end portion of the shaft-shaped member. Furthermore, the hanging object may be directly connected to the lower end of the shaft-shaped member without having a connecting member.

Further, in the above-described embodiment, the slab 10 is the structure to which the load of the suspension and the shaft-shaped member is applied, but the structure is not limited to this. The structure other than the slab 10, for example, the beam under the slab 10 may be configured to be loaded. For example, in the case of the first embodiment, the upper end portion of the arm portion 156 of the support portion 154 is fixed to the beam, and in the second embodiment, the slider 280 is fixed to the beam. ..

Further, in the above-described embodiment, the damper 120 is configured to receive the reaction force by the slab 10, but the present invention is not limited to this. A structure other than the slab 10 such as a beam may be used to receive the reaction force. For example, in the case of the first modification of the first embodiment, the other end of the damper 120 is connected to the beam via a ball joint 122, and in the case of the second modification of the first embodiment, it is fixed. The part 130 is provided on the beam, and in the case of the second embodiment, the arm part 156 of the support part 154 is fixed to the beam.

Note that the structure to which the load of the suspension and the shaft-shaped member is applied and the structure to receive the reaction force of the damper 120 may be different.

Further, the above-described plurality of embodiments and modified examples can be appropriately combined and implemented.

Furthermore, the present invention can be implemented in various modes without departing from the scope of the present invention.

10 slabs (an example of structural materials)
20 ceiling material 22 insertion hole 50 lighting equipment (an example of a hanging object)
100 Suspended object vibration control structure 102 Suspended object vibration suppression structure 104 Suspended object vibration suppression structure 110 Rigid bar (an example of a shaft-shaped member)
110A Lower end 110B Upper end 110C Intermediate part 112 Spherical part 120 Damper (an example of damping means)
150 Support mechanism (an example of support means)
151 Support mechanism (an example of support means)
152 Support Member 153 Support Member 200 Suspended Structure Damping Structure 250 Support Mechanism (An Example of Support Means)
252 Support member 280 Slider 300 Rigid plate (an example of a swing member)

Claims (3)

A ceiling material that is provided under the slab with a gap and has an insertion hole,
A shaft-shaped member that is inserted into the insertion hole and has a hanging object connected to the lower end,
Support means provided on the structural member, for supporting the shaft-shaped member such that an intermediate portion between the lower end portion and the upper end portion of the shaft-shaped member swings about a rotation center,
Damping means for damping the swing of the shaft-shaped member,
Vibration control structure with a suspension. The support means is
A spherical spherical portion provided in the intermediate portion of the shaft-shaped member,
A support member provided on the structural member and rotatably supporting the spherical surface portion;
Has,
The suspension vibration damping structure according to claim 1. The support means is
A slider that is fixed to the structural member and that supports the upper end portion of the shaft-shaped member so as to be horizontally movable.
A support member that is fixed to the structural member and rotatably supports while allowing the vertical movement of the intermediate portion of the shaft-shaped member;
Has,
The suspension vibration damping structure according to claim 1.