JP2015175120A - ceiling structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ceiling structure for damping vibration transmitted between a skeleton and a ceiling board via a support member, and regulating the relative transverse movement between the skeleton and the ceiling board, without checking the vertical vibration insulation function of vibration insulation means.SOLUTION: A suspended ceiling structure 10 comprises a suspension member 16 suspended from a skeleton and having vibration insulation means 18 for insulating vertical vibration, a ceiling board 12 suspended by the suspension member 16, a support member 24 extended downward by being fixed to the skeleton and having restraint force in the horizontal direction and the vertical direction, an overhang member 28 fixed to the support member 24, overhanging by crossing with the direction of the vertical vibration and formed in the side by which flexural rigidity does not check the vertical vibration insulation function of the vibration insulation means 18, and a connection member for connecting the overhang member 28 and the ceiling board 12.

Description

  The present invention relates to a ceiling structure.

  Ceiling panels such as music halls and cinema complexes are equipped with vibration-proofing means for suppressing vibrations from the ceiling to the upper floor frame and vibrations transmitted from the upper floor frame to the ceiling panel (so-called fine vibration including sound). ing. This vibration isolating means is generally configured to suspend the ceiling plate with a suspension member via rubber or the like. On the other hand, in order to give the ceiling plate with this structure an earthquake-resistant function, the suspended ceiling structure body is made of a slanted material (brace) frame, etc. in order to suppress shaking of the suspended ceiling structure body including the ceiling plate during an earthquake. It is necessary to fix to etc.

However, if the ceiling plate is simply fixed to the housing with a support member such as a diagonal member, the vertical vibration insulating function of the vibration isolating means is impaired. In addition, fine vibration including so-called sound is transmitted between the casing and the ceiling plate via the support member.
For example, Patent Document 1 discloses a technique for suppressing vibrations transmitted from a casing to a ceiling board by dividing them into vertical vibrations and horizontal vibrations.

Patent Document 1 suspends a spear child, which is provided on a ceiling and to which various stage instruments are attached, from a vibration-proof floating beam provided on the housing with a connecting member so as to suppress both vertical vibration and horizontal vibration. It is a configuration to lower.
Here, the anti-vibration buoyant beam is provided in the direction crossing the girders between the upper girders. Further, the anti-vibration floating beam is installed on a projecting portion whose both ends are formed as girders, and a first anti-vibration rubber is provided between the upper surface of the projecting portion and the lower surface of the anti-vibration floating beam. ing. In addition, at both ends in the longitudinal direction of the anti-vibration floating beam, there is provided a second anti-vibration rubber that does not come into contact when the anti-vibration floating beam vibrates up and down but absorbs the horizontal vibration when the anti-vibration floating beam vibrates.

JP 09-88230 A

  However, in the technique of Patent Document 1, since the kite is suspended from the anti-vibration floating beam by the connecting member, even if the horizontal vibration at the time of earthquake is attenuated at the position of the anti-vibration floating beam, the kite child (ceiling) due to the pendulum phenomenon Plate) vibration (relative lateral movement of the frame and the ceiling plate) cannot be suppressed.

  In view of the above fact, the present invention attenuates the vibration transmitted between the casing and the ceiling panel via the support member without impairing the vertical vibration isolation function of the vibration isolating means, and the relative lateral movement of the casing and the ceiling panel. The purpose is to provide a ceiling structure that regulates

  The ceiling structure according to the first aspect of the present invention is a suspension member that is suspended from a housing and includes a vibration isolating means that insulates vertical vibrations, a ceiling plate that is suspended by the suspension member, and fixed to the housing. A support member that extends downward and has a restraining force in the horizontal direction and the vertical direction, and is fixed to the support member and protrudes across the direction of the vertical vibration. It has the overhang | projection member made into the magnitude | size which does not inhibit the vertical vibration insulation function of a means, and the connection member which connects the said overhang | projection member and the said ceiling board, It is characterized by the above-mentioned.

According to invention of Claim 1, the ceiling board is connected with the support member via the overhang | projection member and the connection member. Here, the support member has a binding force in both the horizontal direction and the vertical direction, and the overhanging member is installed in the horizontal direction and has a bending rigidity that does not hinder the vertical vibration insulation function of the vibration isolating means. ing. In addition, the overhang member can have axial rigidity that restricts the movement of the ceiling plate in the overhang member axial direction (horizontal direction).
Accordingly, the ceiling plate and the support member can be joined so as to be integrally movable in the horizontal direction without hindering the vertical vibration isolation function of the vibration isolating means provided in the suspension member. Can be given earthquake resistance.

  According to a second aspect of the present invention, in the ceiling structure according to the first aspect, the projecting member has a weak axis direction directed up and down.

  According to invention of Claim 2, the overhang | projection member has orient | assigned the weak axis direction up and down. Thereby, the overhang member can vibrate in the vertical direction, and the vertical vibration resistance can be imparted to the ceiling plate without impairing the vertical vibration insulation function of the vibration isolating means.

  The invention according to claim 3 is the ceiling structure according to claim 1 or 2, wherein the overhang member is provided between the overhang member and the connecting member, and the overhang member and the connecting member There is provided at least one of an elastic material that insulates vertical vibration transmitted between the elastic members and an elastic material that is attached to the projecting member along the material axis direction and that attenuates the vertical vibration of the projecting member. It is characterized by having.

According to the invention described in claim 3, the overhang member is made of an elastic material provided between the overhang member and the connecting member, or an elastic material attached to the overhang member along the material axis direction. The vertical vibration transmitted between the ceiling plate and the ceiling plate is insulated or damped.
Thereby, transmission of the vertical vibration between a housing and a ceiling board is further suppressed.

  According to a fourth aspect of the present invention, in the ceiling structure according to any one of the first to third aspects, the projecting member projects from the support member so as to open in a V shape in plan view. It is characterized by being.

  According to the fourth aspect of the present invention, the projecting member projects so as to open in a V shape from the support member in plan view. When the ceiling plate is inclined, when the overhanging member is extended vertically from the support member in one direction and the other direction, a height adjusting member having a different height is used for each connecting portion with the ceiling plate. There is a need. However, by projecting the overhanging member so as to open in a V shape from the support member, even if the ceiling panel is inclined, the height adjustment is exceptionally maintained while intersecting the direction of vertical vibration that is the object of vibration isolation It can be connected to two points on the ceiling plate of the same height without using a member.

  Since the present invention is configured as described above, the vibration transmitted between the housing and the ceiling plate is attenuated via the support member without impairing the vertical vibration insulation function of the vibration isolating means, and the relative relationship between the housing and the ceiling plate is achieved. A ceiling structure that restricts lateral movement can be provided.

(A) is a front view which shows the basic composition of the ceiling structure which concerns on 1st Embodiment of this invention, (B) is the top view. It is the front view and partial enlarged view which show the whole structure of the ceiling structure which concerns on 1st Embodiment of this invention. (A)-(D) are block diagrams for demonstrating the basic composition of the ceiling structure which concerns on 1st Embodiment of this invention. (A)-(C) are schematic diagrams which show the vertical direction vibration model for demonstrating the anti-vibration earthquake-resistant characteristic of the ceiling structure which concerns on 1st Embodiment of this invention. (A) (B) is a schematic diagram which shows the vertical direction vibration model for demonstrating the anti-vibration earthquake-resistant characteristic of the ceiling structure which concerns on 1st Embodiment of this invention. It is a seismic transmissibility characteristic figure calculated | required with the vertical direction seismic model of the ceiling structure which concerns on 1st Embodiment of this invention. It is a top view which shows the basic composition of the ceiling structure which concerns on 2nd Embodiment of this invention. (A) is a front view which shows the basic composition of the ceiling structure which concerns on 3rd Embodiment of this invention, (B) is the top view.

(First embodiment)
The ceiling structure according to the first embodiment of the present invention will be described with reference to FIGS.
As shown in FIGS. 1 and 2, the suspended ceiling structure 10 has a ceiling plate 12, and the ceiling plate 12 is suspended by suspension bolts (suspending members) 16 suspended from a housing 14 of the building. ing.

The ceiling board 12 is formed of a general ceiling board material such as a plaster board or a wooden board, and the ceiling board 12 is attached to a steel field edge 20 provided at a predetermined interval. The ceiling plate 12 is illustrated as having a configuration (single-layer structure) in which one sheet is disposed in the thickness direction, but may be configured to have a plurality (multi-layer structure) in the thickness direction.
The field edge 20 is fixed to a field edge receiver 22 provided at a predetermined interval in a direction intersecting the field edge 20. The field edge receiver 22 is made of the same steel material as the field edge 20, and is suspended from the housing 14 by suspension bolts 16. Thereby, the ceiling board 12 is supported by the field edge 20 and the field edge receiver 22.

The suspension bolt 16 has an upper end fixed to the housing 14 with an anchor bolt or the like (not shown) and extends downward, and a vibration isolation hanger (vibration isolation means) 18 is attached to the lower end. A plurality of the suspension bolts 16 are provided at predetermined intersections at lattice-like intersections in plan view, and support the ceiling plate 12. The anti-vibration hanger 18 is provided between the suspension bolt 16 and the suspension fitting 50 attached to the field receiver 22.

  For example, as shown in the enlarged view of FIG. 2, the vibration isolator hanger 18 has a hollow box portion 44, and the lower end portion of the suspension bolt 16 is joined to the upper surface of the hollow box portion 44. The upper end of the suspension bolt 16D joined to the suspension fitting 50 is inserted on the lower surface. A rubber member 46 that blocks vertical vibrations is disposed below the inside of the hollow box portion 44. A through hole (not shown) is provided inside the rubber member 46, the upper end of the suspension bolt 16D is penetrated from below, and the upper end of the rubber member 46 is joined to the upper end of the suspension bolt 16D with a nut 16N. Yes.

  Thereby, at the position of the vibration isolator hanger 18, the vertical vibration transmitted from the ceiling plate 12 to the housing 14 and the vertical vibration transmitted from the housing 14 to the ceiling plate 12 are insulated by the rubber member 46.

  A pair of braces (diagonal materials) 24 as support members are fixed to the housing 14. The brace 24 is formed of steel (section steel), and the upper end is oblique from two points (in FIG. 2, the same part as the fixing part of the two suspension bolts 16 adjacent to each other across the brace 24). Extending downward, narrowing the tip. Thereby, it can be made to extend below avoiding crossing with the suspension bolt 16.

  The brace 24 is an earthquake-resistant member, has rigidity that restricts lateral movement of the ceiling board 12 during an earthquake, and a vibration-proof and earthquake-resistant mechanism 30 is constructed at the lower end. The brace 24 is disposed in the X-axis direction along the field receiver 22 provided in the X-axis direction, and integrally moves the housing 14 and the vibration-proof and earthquake-proof mechanism 30 during an earthquake. The braces 24 are also arranged in the Y-axis direction and in a direction intersecting with these as necessary.

The anti-vibration and earthquake-resistant mechanism 30 has a fixed plate 26 joined to the brace 24.
The fixed plate 26 is formed by joining two steel plates in a T-shape when viewed from the side, and has a protruding portion 26U arranged upward and a horizontal plate portion 26D oriented in the horizontal direction. The lower end of the brace 24 is joined to both side surfaces of the protruding portion 26U, and the brace 24 and the fixing plate 26 are integrated.
One end of a projecting material (projecting member) 28 is fixed to the horizontal flat plate portion 26D in a straight line with a gap therebetween. The lower end portion of the fixed plate 26 is arranged with a predetermined gap h1 from the field edge receiver 22.

The overhanging material 28 is formed of a shape steel, and is arranged with the weak axis direction facing up and down.
One end of each of the overhang members 28 is fixed to the horizontal plate portion 26D of the fixed plate 26, and a pair of the projecting members 28 extend linearly from the horizontal plate portion 26D in the horizontal direction. A connecting member (connecting member) 32 is attached to the other end of the overhang member 28. The connecting member 32 is joined to the field edge receiver 22.

  The overhanging material 28 has bending rigidity and elasticity of a size that does not hinder the vertical vibration insulation function of the vibration isolating hanger 18 and has axial rigidity that restrains the movement of the ceiling plate 12 in the material axis direction (horizontal direction). Have. A rubber plate (elastic material) 34 is provided between the overhanging material 28 and the connecting material 32 to attenuate the vertical vibration between the overhanging material 28 and the connecting material 32.

  Thereby, the overhanging material 28 receives vertical vibration and vibrates in the vertical direction. Although details will be described later, it is possible to impart vertical vibration isolation to the ceiling plate 12 without impairing the vertical vibration isolation function of the vibration isolation hanger 18 and to provide horizontal earthquake resistance.

The operation of the present embodiment will be described with reference to FIGS.
As shown in the schematic diagram of FIG. 3 (A), the suspended ceiling structure 82 gives priority to seismic resistance in seismic resistance and joins the seismic brace 24 to the ceiling plate 12 so as not to slip or shift. This is the configuration. Thereby, the seismic force can be transmitted to the housing 14 through the brace 24.

However, in many cases, the anti-vibration hanger 18 is used in series with the suspension bolt 16 in the ceiling board 12 such as a music hall or a cinema complex in order to achieve the required acoustic performance. With this configuration, it is difficult to achieve earthquake resistance for the following reasons.

That is, the rigidity of the brace 24 also affects the rigidity in the vertical direction. The horizontal period by the brace 24 is expected to be 0.2 to 0.33 seconds (3.0 to 5.0 Hz in the frequency notation) during an earthquake. However, since there is amplitude dependence, it is considered that the frequency is several times higher in a minute amplitude region where acoustic performance is a problem.

The inclination angle of the brace 24 is about 45 °, the rigidity addition in the horizontal direction is the same as the rigidity addition in the vertical direction, and the degree of contribution to the frequency at a minute amplitude is about twice that of an earthquake. if any, contribution _{f 2} to frequency increases in the vertical direction by bracing 24 is 6～10Hz.
In order to achieve the acoustic performance, it is common to set the vertical frequency f ₁ to about 10 Hz by supporting the vibration isolation hanger 18 and to set the vibration isolation region to about 14 Hz or more. The vertical frequency f _sum when the brace 24 contributes to the vertical rigidity is given by the following equation (1).

式（１）から、鉛直方向振動数ｆ_ｓｕｍは、およそ１２〜１４Ｈｚとなり、防振域はおよそ１７〜２０Ｈｚ以上となる。このため、音響性能が低下することは避けられない。
また、ブレース２４は、通常、鋼材で構成されるため、部材自体の振動モードは比較的高い固有振動数を有している。この振動が、天井板１２の振動と連成して防振性能を阻害することがある（いわゆるサージング）。

From Expression (1), the vertical frequency f _sum is approximately 12 to 14 Hz, and the vibration isolation region is approximately 17 to 20 Hz or more. For this reason, it is inevitable that the acoustic performance deteriorates.
Moreover, since the brace 24 is normally comprised with steel materials, the vibration mode of member itself has a comparatively high natural frequency. This vibration may be coupled with the vibration of the ceiling board 12 to inhibit the vibration isolation performance (so-called surging).

For example, under the condition that the contribution of the vertical frequency increase of the ceiling board 12 by the brace 24 is 10 Hz, the natural frequency of the brace 24 is 100 Hz, the damping constant of the anti-vibration hanger 18 is 10%, and the damping constant of the brace 24 is Was calculated as 1%.
Although the details will be described later, in the case of the ceiling supported only by the vibration isolating hanger 18, the vibration isolating effect at 100 Hz was approximately −32 bB (vibration transmission rate 1/40). On the other hand, when the brace 24 is used in combination, the anti-vibration effect at 100 Hz is reduced to approximately −8 bB (vibration transmission rate 1 / 2.6) due to the influence of surging.
Thus, it can be said that the structure which joins the ceiling board 12 by which the acoustic performance is calculated | required with the brace 24 so that a slip and the shift | offset | difference may not impair acoustic performance.

Next, in order to give priority to acoustic performance, such as the suspended ceiling structure 83 shown in the schematic diagram of FIG. 3B and the suspended ceiling structure 84 shown in the schematic diagram of FIG. The structure which arrange | positions the anti-vibration hanger 18 in series can be considered. In this configuration, the anti-vibration hanger 18 must transmit the horizontal seismic force borne by the brace 24.
However, the anti-vibration hanger 18 generally does not have a function of transmitting a horizontal force. For this reason, the earthquake resistance by the structure of FIG.3 (B) and FIG.3 (C) is not materialized.

Next, as shown in the suspended ceiling structure 10 shown in the schematic diagram of FIG. 3 (D), the brace 24 is not directly joined to the ceiling plate 12 so as not to slip and shift, but the overhanging material. The structure which joins using 28 is considered. This is the configuration of this embodiment. The overhang member 28 is formed of a light steel frame or the like, and transmits the seismic force borne by the brace 24 as an axial force in principle. The overhanging material 28 has a cross-sectional performance that can firmly transmit the seismic force borne by the brace 24 without breaking or buckling.

On the other hand, the overhanging material 28 is disposed in a direction (in principle, a horizontal direction) substantially orthogonal to a direction (in principle, a vertical direction) in which the ceiling plate 12 is supported in an anti-vibration manner. The cross-sectional shape and the member length are determined so that the vertical rigidity) is sufficiently smaller than the support rigidity by the vibration-proof hanger 18.

Here, the supporting rigidity by the vibration-proof hanger 18 to be compared with the vertical rigidity per one of the projecting members 28 is the number of the projecting members 28 that connect the total area of the ceiling panel 12 to the braces 24 (each in the horizontal direction). It is the support rigidity by the vibration-proof hanger 18 included in the area divided by all directions. Here, sufficiently small rigidity means rigidity that hardly changes the vibration isolation characteristics (vibration isolation frequency) of the vibration isolation hanger 18, and is about 1/20 or less of the support rigidity of the vibration isolation hanger 18. Is a guide.
By adopting this configuration, vibration resistance (acoustic) performance is not hindered and earthquake resistance can be imparted.

Next, the effect will be described.
The overhang 28 is made of lightweight channel steel (for example, C-40 × 20 × 2.3), and the length of the overhang 28 (one end joined to the brace 24 and one end joined to the ceiling or the like) The length between the portions) is 1000 mm, and the overhanging material 28 is attached with the weak axis of the cross section directed in the vertical direction.
The axial rigidity K _j of the overhanging material 28 related to the transmission of the horizontal force is represented by K _j = EA / L, and the axial rigidity K _j = 35.6 kN / mm. Here, E is the Young's modulus, A is the cross-sectional area, and L is the member length.

On the other hand, the bending rigidity K _L of the overhanging material 28 related to the vibration isolation performance is expressed by K _L = 12EI _y / L ³ and the bending rigidity K _L = 0.0161 kN / mm. Here, I _y is the second-order moment of weak axis.
Compared to the shaft stiffness K _j, bending stiffness K _L is very small, and applying a vibration resistance against horizontal seismic forces, be made very small influence on the vibration damping capabilities related to vibration in the vertical direction It can be seen that can be compatible.

The anti-vibration support rigidity K _s of the ceiling plate 12 is expressed by the anti-vibration support rigidity K _s = (2πfv) ² × mS, and assuming that fv = 10 Hz, m = 50 kg, and S = 10 m ² , the anti-vibration support rigidity K _s. = 1.9 kN / mm. Here, fv is a vibration-proof support frequency, m is a unit area mass, and S is a target ceiling area.
If four overhangs 28 are arranged per 10 m ^{2 of} ceiling area, the total vertical rigidity by the overhang 28 is 4K _L , and 4K _L = 0.0644 kN / mm, the ratio is 4K _L / K _s. = 0.0327. The effect of the overhang 28 on the vertical rigidity is 3.3% (approximately 1/30), and the influence on the vibration-proof support frequency is 1.6%, which can be said to be very small.

When anti-vibration support is performed with a metal-based material such as a coil spring, the vibration at the local natural frequency of the metal-based material itself is coupled with the vibration of the ceiling, and surging that impairs the anti-vibration performance. May occur.
The overhang member 28 in the present embodiment is also a metal material and has a local natural frequency. If the end portion of the projecting material 28 is considered to be completely fixed, the local primary natural frequency is about 100 Hz, the second order is about 300 Hz, and the third order is about 600 Hz. Surging of a vibration isolator supported by a coil spring is known to occur at a frequency of 120 Hz and higher, and it can be said that it has almost the same natural frequency as a metal-based support material. . When the ceiling plate 12 is suspended and supported by a metal-based support material instead of the vibration-proof hanger 18 so as to have a predetermined vibration-proof frequency, the vibration characteristics are the same as those of the vibration-proof stand supported by a coil spring or the like. .

The difference between the anti-vibration ceiling and the suspended ceiling structure 10 that suspends and supports the ceiling plate 12 so that the predetermined anti-vibration frequency is obtained with the metal-based support material is that the anti-vibration ceiling is made of only the metal-type support material. Whereas the suspended ceiling structure 10 is supported so as to have a predetermined natural frequency, the suspended ceiling structure 10 is supported on the ceiling plate 12 suspended and supported by the anti-vibration hanger 18 so that the anti-vibration support rigidity of the anti-vibration hanger 18 is approximately 1. A brace 24 connected to the ceiling board 12 is added to the overhanging member 28 having a vertical rigidity of / 30.

  FIG. 4A shows a vertical vibration model of the suspended ceiling structure 66 that is suspended and supported only by the vibration-proof hanger 52, and FIG. 4B is suspended and supported by a metal-based support material (brace) 54. A vibration model of the suspended ceiling structure 68 is shown, and FIG. 4C shows a vertical vibration model of the suspended ceiling structure 70 of the present embodiment.

For simplicity, only the lowest order frequency (100 Hz) was considered as the frequency related to surging. In this embodiment, since the overhang material 56 and the seismic brace 54 are arranged in series, the vibration model is corrected so that the influence of the vertical vibration of the seismic brace 24 can be considered in more detail. Then, the suspended ceiling structure 72 shown in FIG.
Moreover, the vertical vibration model of the suspended ceiling structure 74 in which the brace 54 is directly joined to the ceiling plate 12 suspended and supported by the vibration-proof hanger 52 without using an overhanging material is shown in FIG.

  FIG. 6 shows the result of obtaining the vibration transmissibility in the ceiling board 12 using the vertical vibration models of the four types of suspended ceiling structures 66, 68, 72, 74. The horizontal axis in FIG. 6 is frequency (Hz), and the vertical axis is vibration transmissibility (dB). In the calculation of the vibration transmissibility using the vertical vibration models 66, 68, 72, 74, the rubber plate 34 attached between the projecting material 28 and the connecting material 32 is omitted. Therefore, the damping effect of the vertical vibration by the rubber plate 34 is not reflected.

  In FIG. 6, the characteristic A indicated by the dashed line is the characteristic of the suspended ceiling structure 66 shown in FIG. 4A, and the characteristic B indicated by the broken line is the characteristic of the suspended ceiling structure 68 shown in FIG. The characteristic C indicated by the solid line is the characteristic of the suspended ceiling structure 72 shown in the configuration of the present embodiment (FIG. 5A), and the characteristic D indicated by the alternate long and short dash line is the suspended ceiling structure shown in FIG. Body 74 characteristics.

  As shown in the characteristic D, the vibration-proof support frequency when the brace 54 is directly joined is about 14 Hz, compared with 10 Hz in the other three types. As a result, at 20 Hz, which is the lower limit of the audible range, the vibration transmission rate does not fall below 0 dB (1 time). The vibration transmissibility is less than −20 dB (1/10 times) at about 55 Hz, which is clearly inferior in vibration-proof (acoustic) performance compared to the other three types of ceilings.

  Both the characteristic D of the configuration in which the brace 54 is directly joined and the characteristic B of the configuration in which the brace 54 is suspended and supported by the metal material are affected by surging near 100 Hz, and the vibration transmissibility near 100 Hz is affected by the vibration isolating material. In the anti-vibration ceiling supported by suspension, it is about -32 dB (1/40 times), but is deteriorated to about -8 dB (1 / 2.6 times). In this frequency range, it cannot be said that it has sufficient anti-vibration (acoustic) performance.

  As shown in the characteristic C, in the suspended ceiling structure 72, the influence of surging by the overhanging material 28, which is a metal material, and the brace 24 for earthquake resistance appears in the vicinity of 70 Hz and in the vicinity of 100 Hz. However, the degree is sufficiently small, and the increase in vibration transmissibility is about 3 to 4 dB (1.4 to 1.6 times) compared to the vibration-proof ceiling suspended and supported by the vibration-proof material.

  That is, the vibration transmissibility in the vicinity of 70 Hz and 100 Hz is approximately −24.5 dB (1/17 times) and approximately −29.5 dB (1/30 times), respectively. It can be said that it has. In other words, it can be said that the suspended ceiling structure 72 does not impair vibration-proof (acoustic) performance and can provide earthquake resistance necessary for avoiding human life damage during an earthquake.

  As described above, according to the present embodiment, the vertical vibration between the housing 14 and the ceiling board 12 is attenuated by the suspension bolt 16 provided with the vibration-proof hanger 18. Further, the vibration-proof and earthquake-resistant mechanism 30 attenuates the vibration transmitted between the casing 14 and the ceiling board 12 via the pair of braces 54 without disturbing the vertical vibration damping function of the vibration-proof hanger 18, and also the casing. The ceiling structure which controls the relative lateral movement of 14 and the ceiling board 12 can be provided.

In the present embodiment, the configuration in which the rubber plate (elastic material) 34 is provided between the overhanging member 28 and the connecting member 32 is described. However, the present invention is not limited to this, and the rubber plate 34 may be attached along the material axis direction of the overhanging material 28 depending on the vibration transmitted between the overhanging material 28 and the connecting material 32. . Furthermore, a rubber plate 34 may be provided between the projecting material 28 and the connecting material 32, and the rubber plate 34 may be attached along the material axis direction of the projecting material 28.
Thereby, the vertical vibration transmitted between the overhanging material 28 and the ceiling board 12 is insulated or attenuated.

  In the present embodiment, the pair of braces 24 that fix the vibration-proof and earthquake-resistant mechanism 30 are configured to project obliquely from the housing 14. However, the present invention is not limited to this, and the brace 24 has a rigidity that restricts the movement of the ceiling plate 12 in the lateral direction, and can be configured to move the housing 14 and the vibration-proof and earthquake-resistant mechanism 30 integrally. The member direction may be a vertical direction, or the member shape may be bent.

  Further, in the present embodiment, the pair of braces 24 are configured to project obliquely from the same fixed position as the suspension member 16 provided on the housing 14. However, the present invention is not limited to this and may be fixed at a fixed position different from that of the suspension member 16.

(Second Embodiment)
A ceiling structure according to the second embodiment of the present invention will be described with reference to FIG.
As shown in the plan view of FIG. 7, the suspended ceiling structure 40 is arranged such that the direction of the pair of braces 42 and the overhanging material 48 intersects the field edge 20 and the field edge receiver 22. This is different from the first embodiment. The difference will be mainly described.

Since equipment equipment, ducts, and piping are arranged in the ceiling space of the suspended ceiling structure 40, for example, in the X-axis direction along the edge receiver 22 as in the first embodiment, the overhanging material 28 is provided. Or braces 24 may not be provided.
In this case, the direction of the brace 42 and the overhanging material 48 may be arranged so as to intersect with the field edge 20 and the field edge receiver 22. However, in this case, care must be taken not to overlap the position of the suspension bolt 16.

By appropriately arranging the brace 42 and the overhanging material 48, relative lateral movement of the casing 14 and the ceiling board 12 in the X-axis direction and the Y-axis direction can be restricted.
Note that the arrangement in FIG. 7 is an example, and the arrangement may be determined according to the status of ducts and piping in the space behind the ceiling, the position of the suspension bolt 16, and the like.
Thus, the vibration transmitted between the casing 14 and the ceiling board 12 via the pair of braces 42 is attenuated without impairing the vertical vibration damping function of the vibration isolating hanger 18, and the A ceiling structure that restricts relative lateral movement can be provided.
Other configurations are the same as those of the first embodiment, and a description thereof will be omitted.

(Third embodiment)
A ceiling structure according to the third embodiment of the present invention will be described with reference to FIG.
As shown in the front view of FIG. 8A and the plan view of FIG. 8B, the suspended ceiling structure 60 is the first embodiment in that the ceiling plate 76 is inclined at an angle θ with respect to the horizontal plane H. Is different. The difference will be mainly described.

In the suspended ceiling structure 60, the ceiling plate 76 is inclined at an angle θ with respect to the horizontal plane H in the X-axis direction. The pair of braces 62 are arranged in the X-axis direction, and the upper ends are joined to the housing 14 at a predetermined distance in the X-axis direction.
The anti-vibration and earthquake-proof part 58 constructed at the lower end part of the brace 62 is provided with a ceiling plate 76 and a height h2. The projecting material 64 extending in the horizontal direction from the vibration-proof and earthquake-resistant part 58 is projected so as to open in a V shape in the direction in which the height of the ceiling plate 76 is high from the fixed plate 26 to which one end is fixed.

The other end of the overhang member 64 is connected to the pair of connecting members 32 via the connecting plate 80. The connecting member 32 is fixed to the field edge receiver 22, and the field edge receiver 22 is fixed to the field edge 20 to which the ceiling plate 76 is attached.
The pair of connecting members 32 is fixed by an auxiliary member 78 provided in the direction of the field edge 20, and the auxiliary member 78 and the overhanging member 64 form a triangle.

  By adopting this configuration, an out-of-plane force acting on the brace 62 can be obtained by projecting the projecting material 64 so as to open in a V shape from the fixed plate 26 without using height adjusting members having different heights. Since the horizontal seismic force can be transmitted by minimizing, even if the ceiling panel 76 is inclined, it remains the same without using a special height adjusting member while crossing the direction of the vertical vibration that is the object of vibration isolation. It can be connected to two points on the ceiling plate 76 having a height.

Thereby, the vertical vibration transmitted between the overhanging material 64 and the ceiling board 12 can be insulated or attenuated. In the present embodiment, the projecting material 64 is projected so as to open in a V shape from the fixed plate 26. However, the present invention is not limited to this, and the relative lateral movement of the housing 14 and the ceiling plate 76 is small. In some cases, it may overhang from the fixed plate 26 in a cantilevered state.
Other configurations are the same as those of the first embodiment, and a description thereof will be omitted.

10, 40, 60 Suspended ceiling structure 12 Ceiling panel 14 Housing 16 Suspension bolt (suspending member)
18 Anti-vibration hanger (anti-vibration means)
20 Field edge
22 Field edge receiver 24 Brace (supporting member)
26 Fixed plate 28, 48, 64 Overhang material (overhang member)
30 Anti-vibration and earthquake-proof part 32 Connecting material (connecting member)
34 Rubber plate (elastic member)

Claims (4)

A suspension member that is suspended from the housing and has a vibration isolating means for insulating vertical vibrations;
A ceiling board suspended by the suspension member;
A support member fixed to the housing and extending downward, and having a restraining force in the horizontal and vertical directions;
A projecting member fixed to the support member and projecting across the vertical vibration direction, and having a bending rigidity that does not hinder the vertical vibration insulation function of the vibration isolating means;
A connecting member that connects the overhang member and the ceiling plate;
With ceiling structure.   The ceiling structure according to claim 1, wherein the projecting member has a weak axis direction directed upward and downward. In the overhang member,
An elastic material that is provided between the overhang member and the connecting member and insulates vertical vibrations transmitted between the overhang member and the connecting member;
Or an elastic material that is affixed to the projecting member along the material axis direction and attenuates the vertical vibration of the projecting member,
The ceiling structure according to claim 1 or 2, wherein at least one of the above is provided.   The ceiling structure according to any one of claims 1 to 3, wherein the projecting member projects so as to open in a V shape from the support member in plan view.

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