Vibration-damping ceiling

Abstract

To prevent a ceiling member from being damaged and dropping out of the member by suppressing horizontal displacement generated in an existing suspended ceiling when an earthquake occurs.SOLUTION: A suspended ceiling is provided with a vibration control mechanism comprising a plurality of pulley groups each comprising a movable pulley unit having a coaxial movable pulley and a fixed pulley unit having a coaxial fixed pulley opposed to the movable pulley unit, a braking damper, and a wire stretched between each pulley group and the braking damper. When the suspended ceiling is displaced at the time of the occurrence of an earthquake, and when the wire generates a predetermined displacement between the pulley groups, the displacement amount of the wire is amplified with respect to the relative displacement amount generated in the suspended ceiling, and the wire passes through the braking damper by the displacement amount, so that the energy input to the suspended ceiling is attenuated.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a vibration-damping ceiling. By retrofitting a vibration-damping mechanism member to an existing suspended ceiling, it is possible to suppress the horizontal acceleration and horizontal displacement generated in the suspended ceiling during an earthquake, and to prevent damage and detachment of the ceiling members. The present invention relates to a vibration-damping ceiling.

Background Art

[0002] In a conventional suspended ceiling (conventional ceiling) 60, for example, as shown in Fig. 7(a), it has not been obligatory to use earthquake-resistant members or the like for each member such as a suspension member 62 that supports a ceiling board 61. Subsequently, "Technical Standards for Countermeasures against Ceiling Detachment in Buildings" and the like based on the Building Standards Law promulgated in 2013 were established. In the case of a suspended ceiling 60 where the ceiling cavity height exceeds 1.5 m, as shown in Fig. 7(b), it has been required in design to attach reinforcing members such as diagonal members 63 (hereinafter referred to as braces 63) so as to form a V shape with the suspension member 62 (suspension bolt) in between. In such a suspended ceiling 60 with such a ceiling detachment prevention measure, the response displacement of the ceiling during an earthquake can be reliably suppressed.

[0003] However, in a suspended ceiling with a brace 63 attached as shown in Fig. 7(b), although the response displacement of the ceiling during an earthquake is reduced, the response acceleration increases. Therefore, earthquake damage such as buckling and breakage of the suspension bolts and damage to the mounting fixtures of the ceiling base materials such as clips and hangers has occurred. In addition, in the method of attaching a brace 63 to the suspension member for reinforcement, there is also a problem that when air conditioning ducts, equipment, pipes, wiring cables, etc. are installed in the ceiling space 65, the brace 63 cannot be installed at an appropriate interval.

[0004] In response to these problems, some of the applicants of the present application have proposed a vibration-damping ceiling (Patent Document 1) in which a viscoelastic damper is attached between the ceiling material and the suspension member, and a vibration-damping ceiling (Patent Document 2) in which the side end portion of the ceiling surface material is sandwiched by a viscoelastic damper attached to the building wall surface, in order to reduce the response acceleration on the ceiling surface.

[0005] These vibration control ceilings are inventions intended to reduce the response acceleration generated in the suspended ceiling during a major earthquake by installing viscoelastic dampers or the like. Therefore, by using an oil damper or the like, it functions effectively when a large relative displacement occurs between the building structure and the ceiling surface during a major earthquake, but it is difficult to sufficiently cover even small and medium-sized earthquakes with a small sway amplitude of the ceiling surface. In addition, in order to ensure the operation of the viscoelastic damper, it is necessary to make the damper support member firm, and the support member becomes relatively large, which is an excessive facility for a small-scale suspended ceiling.

[0006] On the other hand, some of the applicants of the present application have jointly developed a vibration control device with a structure in which wires are stretched across the entire outer periphery of a building to a damper and a plurality of sets of pulley groups in order to control the displacement of the entire building (the amount of movement relative to the ground surface) during an earthquake (Patent Document 3). According to this vibration control device, a vibration control effect can be obtained for the same displacement amount compared to conventional vibration control devices.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Patent Document 2

Patent Document 3

Summary of the Invention

Problems to be Solved by the Invention

[0008] Patent Document 3 discloses a plurality of embodiments and reference examples. In the vibration damping device of a typical embodiment, a wire is stretched between a pulley group (fixed pulley) installed on the ground surface and a pulley group (movable pulley) installed on the rooftop (top) of a building. When a wire passes through a damper provided on the wire path by a predetermined movement amount, energy is attenuated, and the relative displacement of the entire building with respect to the ground is controlled. Further, as another reference example, pulley groups are installed on respective beams located above and below a structure of a ramen framework, a wire is stretched between the pulley groups of the upper and lower beams, and when the wire passes through a damper provided on the wire path (for example, a part of the upper beam) by a predetermined movement amount, energy is attenuated, and the relative displacement between the beam members is controlled.

[0009] The invention disclosed in Patent Document 3 can suppress the relative displacement of the entire building with respect to the ground surface during an earthquake. However, since the movement of the wire generated according to the relative displacement amount occurring between the building and the ground surface or between structures such as beams is braked by a damper, it is assumed to function effectively when a large relative displacement occurs such as in a major earthquake. Further, since the vibration damping device is large-scale, it is not assumed to be added to relatively lightweight structures such as the above-described suspended ceilings.

[0010] Therefore, an object of the present invention is to solve the problems of the above-described conventional technologies, install an inexpensive vibration damping mechanism by adding it to an existing suspended ceiling, and provide a vibration damping ceiling capable of ensuring the safety of the suspended ceiling during the occurrence of small to large earthquakes.

Means for Solving the Problems

[0011] The vibration damping ceiling of the present invention includes a suspended ceiling in which a ceiling board is suspended from a building frame via a suspension material and a ceiling base material, Fixed and held on the ceiling base material a first movable pulley unit having a plurality of coaxially connected movable pulleys, and a first fixed pulley unit having a plurality of coaxially connected fixed pulleys facing the first movable pulley unit, which together form a first pulley group, Fixed and held on the building body side as if a second movable pulley unit having a plurality of coaxially connected movable pulleys, and a second fixed pulley unit having a plurality of coaxially connected fixed pulleys facing the second movable pulley unit, which together form a second pulley group, Fixed and held on the ceiling base material a second movable pulley unit having a plurality of coaxially connected movable pulleys, and a second fixed pulley unit having a plurality of coaxially connected fixed pulleys facing the second movable pulley unit, which together form a second pulley group,Fixed and held on the building body side as if A second pulley group including a second fixed pulley unit having a plurality of coaxially connected fixed pulleys, One end is fixed to the building body side near the first fixed pulley unit of the first pulley group, spanned between the first fixed pulley unit and the first movable pulley unit, and further runs along the body surface suspending the suspended ceiling through the first fixed pulley unit. The other end reaches the second pulley group, is spanned between the second fixed pulley unit and the second movable pulley unit, and is fixed to the building body side near the second fixed pulley unit a wire, and a braking means installed on a body surface for suspending the suspended ceiling of the building body, When the wire passes through the inside, resistance is applied to the movement of the wire and when an earthquake occurs and the suspended ceiling is displaced relative to the building body, The movement of the wire in the running direction according to the pulley rotation accompanying the displacement of the first movable pulley unit and the second movable pulley unit fixed and held on the suspended ceiling base material it occurs, and the The movement of the wire at that time amount is amplified according to the number of connected coaxial movable pulleys with respect to the relative displacement amount generated in the suspended ceiling, and the energy input to the suspended ceiling is attenuated by passing the amplified wire through the braking means. Receiving resistance by the amount of movement It is characterized in that

[0015] The braking means is preferably a damper capable of following the The movement amount of the wire.

[0017] The wire is preferably stretched substantially horizontally between the first fixed pulley unit and the first movable pulley unit, and between the second fixed pulley unit and the second movable pulley unit.

[0018] The first pulley group includes a first movable pulley unit suspended from the ceiling, Fixed and held on the base material and a first fixed pulley unit installed near the suspension point of the suspension material so as to face the first movable pulley unit, Fixed and held and the second pulley group includes a second movable pulley unit suspended from the ceiling, Fixed and held on the base material and a second fixed pulley unit installed near the suspension point of the suspension material so as to face the second movable pulley unit, Fixed and held and the wire preferably stretches diagonally between the ceiling Base material side and the vicinity of the suspension point. Between the side s

[0019] The vibration damping ceiling of the present invention includes a suspended ceiling in which a ceiling board is suspended from a building body via a suspension material and a ceiling base material, a first movable pulley unit installed on the ceiling, Base material and a first pulley group including a first fixed pulley unit installed on the building body side so as to face the first movable pulley unit, and a ceilingBase material A second pulley group including a second movable pulley unit installed thereon and a second fixed pulley unit installed on the building body side so as to face the second movable pulley unit, The first fixed pulley unit of the first pulley group and the second fixed pulley unit of the second pulley group a wire spanned between them, Installed on the body surface of the building body that suspends the suspended ceiling. When the wire passes through the inside, resistance is applied to the movement of the wire and braking means, wherein the wire One end is fixed to the building body side near the first fixed pulley unit of the first pulley group, spanned between the first fixed pulley unit and the first movable pulley unit, and further runs along the body surface suspending the suspended ceiling through the first fixed pulley unit. The other end reaches the second pulley group, is spanned between the second fixed pulley unit and the second movable pulley unit, and is fixed to the building body side near the second fixed pulley unit when an earthquake occurs and the suspended ceiling is displaced relative to the building body, The movement of the wire in the running direction according to the pulley rotation accompanying the displacement of the first movable pulley unit and the second movable pulley unit fixed and held on the suspended ceiling base material is generated, and the energy input to the suspended ceiling is attenuated by passing through the braking means. Receiving resistance by the amount of movement of the wire at that time It is characterized in that

[0020] The amount of the wire The movement is preferably determined by the amplification factor from the relative displacement amount and the number of coaxial movable pulleys constituting the first movable pulley unit and the number of coaxial movable pulleys constituting the second movable pulley unit. Amplified with respect to the relative displacement amount generated in the suspended ceiling, and the energy input to the suspended ceiling is attenuated by passing through the braking means while receiving resistance by the amount of movement of the amplified wire It is preferable.

Advantages of the Invention

[0021] According to the present invention, an inexpensive mechanism can be installed in a limited space within the suspended ceiling, efficiently reducing the response acceleration and response displacement of the suspended ceiling during the occurrence of small to large earthquakes, enhancing the damping effect of the installed damper, and ensuring the safety of the suspended ceiling.

Brief Description of the Drawings

[0022]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0023] Hereinafter, embodiments of the vibration control ceiling of the present invention will be described with reference to the accompanying drawings.

[0024] Fig. 1(a) partially shows the configuration of a suspended ceiling of an embodiment of the vibration control ceiling of the present invention. The suspended ceiling 1 that becomes the vibration control ceiling of the present invention has the same configuration as a conventional ceiling as shown in the figure, and includes a ceiling board 2 such as a ready-made gypsum board that constitutes the ceiling surface, and furring strips 3 and furring strip receivers 4 as ceiling substrates arranged in a grid pattern at predetermined intervals to support the ceiling board 2 over the entire ceiling surface. To support the ceiling board 2 and the ceiling substrate, there is a suspension bolt 6 as a suspension member whose upper end is fixed to the lower surface 9 of the upper floor slab and hangs down, and whose lower end is attached to the furring strip receiver 4 via a hanger 5. Furthermore, a vibration control mechanism is added and installed to function as a vibration control ceiling.

[0025] As shown in Fig. 1(b) by enlarging a part of Fig. 1(a), the vibration control mechanism 10 of the present embodiment is attached to a part of the suspension member of the suspended ceiling 1, and includes a movable pulley unit 20 that operates as a movable pulley, and a fixed pulley unit 30 that is fixedly supported on the wall surface 8 near the ceiling board 2 and near the lower surface 9 of the upper floor slab (the suspension point of the suspension member) and operates as a fixed pulley to change the running direction of the wire. It also includes a braking damper 40 that is fixedly held on the lower surface 9 of the upper floor slab and controls the displacement (movement) amount of the wire W passing through it and attenuates energy.

[0026] In order to make the suspended ceiling 1 function as a vibration-isolated ceiling, the vibration isolation mechanism 10 includes, as an example, a first pulley group 101 installed on one end side of the suspended ceiling 1 and a second pulley group installed on the other end side of the suspended ceiling 1, with a moving pulley unit 20 and a fixed pulley unit 30 forming a set. A wire W is strung across each pulley. One end A of the wire W is fixedly secured to the wall surface 8 near the first pulley group 101, and is strung across the pulleys of the moving pulley unit 20 and the fixed pulley unit 30 of the first pulley group 101 in sequence. The middle part C of the wire W passes through a braking damper 40 fixedly held on the lower surface of the upper floor slab 9 and is guided to the second pulley group 102 installed on the other end side of the suspended ceiling 1. Similarly, it is wound around the pulleys of the second pulley group 102, and the other end B is fixedly secured to the wall surface 8 near the second pulley group 102.

[0027] Here, the component configurations of the moving pulley unit 20 and the fixed pulley unit 30 of the first pulley group 101 shown in FIG. 1(a) will be described with reference to FIGS. 1(b), 2(a), and 2(b). FIG. 1(b) shows the configurations and arrangement examples of the moving pulley unit 20 and the fixed pulley unit 30 of a set of vibration isolation mechanisms 10 incorporated in the suspended ceiling 1 shown in FIG. 1(a). Also shown in the figure are the wires strung across each pulley group and wound around the pulleys, which are shown virtually. In FIGS. 2 and later, for the sake of simplifying the figures, the illustrations of the ceiling base materials such as the edges, edge supports, and hangers are omitted.

[0028] The movable pulley unit 20 of this embodiment consists of, as an example, three coaxial movable pulleys (a plurality of movable pulleys supported in parallel on a single rotating shaft and capable of independent rotation; refer to Fig. 2(b)). The coaxial movable pulley 21 is pivotally supported by a bearing bracket 22, and the bearing bracket 22 is supported by a pedestal bracket 23 for fixed holding at the intersection position with the edge 3 of the edge 3 receiver (Fig. 1(a)). The bearing bracket 22 and the pedestal bracket 23 of this embodiment are made of steel plate processed materials, and the dimensions of each part are manufactured in accordance with the member dimensions of the existing edge 3 and edge receiver 4 that support the suspended ceiling 1. Therefore, by manufacturing the pedestal bracket according to the various sizes of the edge 3 and edge receiver 4 used in the existing suspended ceiling 1, a vibration damping mechanism 10 that can be installed by post-construction on the existing suspended ceiling 1 can be provided. By using this vibration damping mechanism 10, the existing suspended ceiling 1 can be relatively easily improved to a vibration-damping ceiling.

[0029] As shown in Fig. 1(a), the fixed pulley unit 30 of this embodiment consists of a coaxial fixed pulley 31 fixedly held on the wall surface 8 near the end of the ceiling board 2 of the suspended ceiling 1, and a direction-changing pulley 32 attached to the wall surface 8 near the lower surface of the upper floor slab 9. The number of pulleys of the coaxial fixed pulley 31 is the same as that of the coaxial movable pulley 21 of the movable pulley unit 20 (three in series). The coaxial fixed pulley 31 of the fixed pulley unit 30 is pivotally supported by a bearing bracket 34 attached to a base plate 35. The base plate 35 is fixedly held on the wall surface 8 by a post-construction anchor or the like (not shown). Note that the number of pulleys incorporated in the movable pulley unit 20 and the fixed pulley unit 30 is related to the amplification factor of the response displacement amount of the suspended ceiling 1 during an earthquake. Therefore, it is preferable to determine the number of pulleys based on the relationship between the movement amount of the wire W and the movement amount that the brake damper 40 can control.

[0030] As shown by the phantom line in Fig. 1(b), one end A of the wire W is fixedly anchored to the wall surface 8 near the base plate 33 of the coaxial fixed pulley 31 via the anchor plate 36, and is strung between the movable pulley unit 20 on the suspended ceiling 1 surface and the coaxial fixed pulley 31 on the wall surface 8 side of the housing for several rounds corresponding to the number of pulleys. Then, it extends from the coaxial fixed pulley 31 to the direction-changing pulley 32 located upward near the wall surface 8, and is direction-changed by the direction-changing pulley 32 to be substantially horizontal along the lower surface 9 of the upper floor slab. The middle part C is guided to the braking damper 40 installed at a predetermined position (usually the central position between beams) on the lower surface 9 of the upper floor slab. After passing through the braking damper 40, it heads towards the direction-changing pulley 32 on the opposite side (Fig. 2(a)).

[0031] A rotary damper (hereinafter denoted by reference numeral 40) is used as the braking damper 40 of the present embodiment. The wire W enters from one port of the rotary damper 40 at the middle part C, is wound around a rotor shaft (not shown) in the damper, exits from the other port, and heads towards the direction-changing pulley 32 attached to the wall surface 8 on the opposite side (Fig. 2(a)). When the wire W passes through the rotary damper 40, it is braked by the rotational resistance of the rotor having a predetermined viscous resistance, and the passage within the damper is restricted, thereby attenuating the energy. As other types of braking dampers, a direct-acting oil damper, a steel material-based hysteresis damper, etc. are suitable. In the case of a direct-acting oil damper, the amount of wire displacement (movement) is controlled by the expansion and contraction resistance of a cylinder rod having a predetermined stroke. The type and mechanism of the braking damper 40 are not limited, but it is necessary that the damping mechanism of the damper can operate following sufficiently the assumed amount of displacement (movement) of the wire W.

[0032] [Operating Principle of the Vibration-Damping Ceiling] Here, the operating principle of the vibration control ceiling equipped with the vibration control mechanism 10 having the above-described configuration will be described with reference to each of the drawings in FIG. 2. FIG. 2(a) shows a suspended ceiling 1 functioning as a vibration control ceiling and a schematic configuration of the vibration control mechanism 10 incorporated in the suspended ceiling 1. FIG. 2(b) schematically shows a state in which a wire W is stretched between a movable pulley unit 20 having the above-described triple (n = 3) coaxial movable pulleys 21 and a fixed pulley unit 30 having a coaxial fixed pulley 31. FIG. 2(c) shows a state in which the vibration control ceiling shown in FIG. 2(a) is displaced by a relative displacement amount d with respect to the surrounding wall surface 8 due to the occurrence of an earthquake, and the vibration control mechanism 10 operates.

[0033] As shown in FIG. 2(c), when a horizontal force acts on the vibration control ceiling of the present invention via the building structure during an earthquake and a relative displacement d occurs between the suspended ceiling 1 and the structure (wall surface 8), since the wire W is stretched substantially horizontally along the ceiling surface, the horizontal displacement of the wire W in the vicinity of the braking damper 40 with respect to the relative distance d between the movable pulley unit 20 and the fixed pulley unit 30 is amplified (enlarged) by 2n times according to the principle of a plurality of series (n series) of movable pulleys, and D = 2n·d. Therefore, in this vibration control mechanism 10, the braking damper 40 can be operated by an amount corresponding to the amplified wire displacement (movement) amount, and a greater energy attenuation effect can be obtained. Therefore, it is possible to expect an energy attenuation effect obtained by the braking damper 40 for seismic motions in a wide range from small earthquakes with a small relative displacement amount of the suspended ceiling 1 to large earthquakes with a large relative displacement.

[0034] [Example of Elevation Installation of Vibration Control Mechanism] Each of the figures in Fig. 3 is a schematic front view showing an installation example of vibration damping in the vibration-damping ceiling of the present invention. Fig. 3(a) is an installation example with the same configuration as the installation examples shown in Fig. 1(a) and Fig. 2(a). By installing the movable pulley unit 20 on the existing suspended ceiling 1 by post-construction, the vibration-damping mechanism 10 can be easily incorporated. According to this installation example, since the fixed pulley unit 30 is fixedly supported on the wall surface 8 around the suspended ceiling 1, upper floor beams, etc., the wire W can be stretched between the pulley groups so as not to interfere with various equipment such as the duct 50 and cable rack 51 in the ceiling space. Fig. 3(b) is an installation example in which the fixed pulley unit 30 is not provided on the wall surface 8 side but is installed via a mounting bracket or the like at the suspension point of the suspension member supporting the suspended ceiling 1. In this installation example, the vibration-damping mechanism 10 can be added to make a vibration-damping ceiling only by performing the operation of attaching the movable pulley unit 20 to the existing suspended ceiling 1 side and the fixed pulley unit 30 to the suspension side. Fig. 3(c) shows an installation example in which the vibration-damping mechanism 10 is added to the suspended ceiling 1 side assuming a case where the ceiling area is large, the ceiling is partitioned, and the structure (wall or beam) for attaching the pulley group is not close to the suspended ceiling 1. In each installation example, it goes without saying that the number of installations, arrangement intervals, and positions of the vibration-damping mechanism 10 should be appropriately set according to the planar area and planar shape of the suspended ceiling 1. In the case of the installation examples shown in Fig. 3(b) and (c), the wire W is stretched at a predetermined angle θ according to the ceiling height between the fixed pulley unit 30 on the suspension side at the ceiling position and the movable pulley unit 20 on the suspended ceiling 1 surface. When the angle θ formed by the wire W obliquely stretched between the pulley groups and the suspended ceiling 1 surface, the amplification factor of the movement amount decreases from 2n times to 2n·cosθ times. Therefore, it is preferable to adjust the amplification effect by increasing the number of connected coaxial pulleys.

[0035] [Planar Installation Example of Vibration-Damping Mechanism] FIG. 4 schematically shows a planar installation example in which the vibration control mechanism 10 is installed in the vertical and horizontal directions of the suspended ceiling 1. As shown in FIG. 4, in the suspended ceiling 1 having a substantially square shape in plan view surrounded by the wall surface 8, the suspended ceiling 1 is displaced relative to the wall surface 8 in a composite manner in the X-Y direction during an earthquake. In order to effectively respond to this relative displacement, it is preferable to install vibration control mechanisms 10 having the same configuration along directions orthogonal to the X-Y direction. Thereby, the amplification of the displacement amount of the wire W generated in that direction can be achieved by the vibration control mechanisms 10 installed along each direction, and energy attenuation by the braking damper 40 in the vibration control mechanism 10 can be achieved. Further, as shown in FIG. 2(a), a swivel mechanism 37 is provided in a part of the support member of the coaxial fixed pulley 31 attached to the wall surface 8 near the edge of the suspended ceiling 1 and the direction-changing pulley 32 attached to the lower surface of the upper floor slab 9 or the wall surface 8 in its vicinity, so that even when the suspended ceiling 1 is displaced in a composite manner in the X-Y direction, the traveling direction of the wire W passing through the pulley can freely follow along the displacement direction of the suspended ceiling 1.

[0036] [Modification Example of Vibration Control Mechanism] FIG. 5 shows a vibration control ceiling in which, as a modification example of the vibration control mechanism 10, a vibration control mechanism 10 is installed with the rotation axis 25 of the coaxial movable pulley 21 of the movable pulley unit 20 installed on the ceiling board 2 of the suspended ceiling 1 in the direction along the Z direction (perpendicular to the paper surface) in the figure. This vibration control ceiling is displaced relative to the wall surface 8 around the ceiling in a composite manner in the X-Y direction during an earthquake, but each pulley of the movable pulley unit 20 installed on the ceiling board 2 can freely rotate following this displacement, and the displacement of the wire W is transmitted to the braking damper 40 via a direction-changing pulley (not shown) that does not smoothly illustrate, and energy attenuation by the braking damper 40 is achieved. By installing the movable pulley unit 20 on the surface of the suspended ceiling 1 in the direction of the rotation axis 25 as shown in FIG. 5, the movable pulley unit 20 can smoothly respond to the composite relative displacement of the suspended ceiling 1. Therefore, the vibration control mechanism 10 having the configuration shown in FIG. 5 can correspond to the composite displacement of the suspended ceiling 1 by being installed only in the X direction in the figure.

[0037] In this modification, since the rotation axis 25 of the coaxial movable pulley 21 of the movable pulley unit 20 and the rotation axis 35 of the coaxial fixed pulley 31 of the fixed pulley unit 30 are orthogonal to each other, the wire W is stretched between the coaxial movable pulley 21 and the coaxial fixed pulley 31 in a twisted state. In order to ensure smooth rotation of each pulley in this state and to prevent excessive tension from acting on the wire W, it is preferable to appropriately set the pulley diameter, the thickness of the wire W, etc. Further, even when the suspended ceiling 1 undergoes a composite relative displacement, by incorporating a variable joint structure such as a swivel joint or a universal joint into the support structure of the bearings of the rotation axes 25 and 35, the direction of each pulley can be made to follow the direction of displacement of the wire W that changes sequentially, thereby ensuring smooth displacement (travel) of the wire W.

[0038] [Vibration damping effect confirmation experiment of the vibration damping ceiling] The vibration damping effect (response displacement, response acceleration) of the vibration damping ceiling of the present invention was confirmed by a model experiment in comparison with a conventional suspended ceiling (conventional ceiling). Vibration experiments were conducted using the following four types of suspended ceiling models as the configurations of the vibration damping ceiling and the conventional ceiling of the present invention. (Suspended ceiling model) Dimensions: Ceiling board (4m × 4m), ceiling cavity height (1.5m) Ceiling specifications: (1) Vibration damping ceiling 1 (fixed pulley: wall surface support, wire horizontal, 2 vibration damping mechanisms) (2) Vibration damping ceiling 2 (fixed pulley: suspension point support, wire inclined by about 60°, 2 vibration damping mechanisms) (3) Conventional ceiling 1 (no earthquake resistance measures) (4) Conventional ceiling 2 (with earthquake resistance braces) (Vibration excitation (vibration) conditions) Experimental equipment: Suspended ceiling models (1) to (4) were installed in a rigid frame (corresponding to the building body) assembled on a large three-axis shaking table. Input wave: Announced wave (ground motion specified in No. 4 of Notification No. 1461 of the Ministry of Construction in 2000) Vibration excitation method: The announced wave was standardized on the upper surface of the shaking table, and vibration excitation was performed in the horizontal 1 direction at intervals of 50 cm / s in the range of 50 to 300 cm / s 2 of 2 increments. (Vibration test results) The relationships between the input acceleration and the response acceleration, and between the input acceleration and the response displacement in each suspended ceiling model under the above-described test conditions are shown in FIGS. 7(a) and (b). As can be seen from both graphs, in the existing ceiling 1 without earthquake-resistant measures, excessive response displacement occurs in the ceiling board with respect to the input acceleration, and it is clear that there is a risk that the ceiling board will collide with the building structure and be damaged or fall. Also, in the existing ceiling 2 with earthquake-resistant braces, the rigidity of the suspension members is increased by the earthquake-resistant braces, and the relative displacement of the suspended ceiling is suppressed, but the response acceleration becomes excessive, and there is a risk that member damage or the like will occur due to the external force acting exceeding the strength of each part of the suspended ceiling. On the other hand, in the models of the vibration-damping ceiling of the present invention (vibration-damping ceilings 1 and 2), both the response acceleration and the response displacement are suppressed from a small input acceleration. In particular, in the vibration-damping ceiling 1 in which the wire W is horizontally stretched, it was confirmed that the response displacement is more reliably suppressed.

[0039] Note that the present invention is not limited to the above-described embodiments, and various modifications are possible within the scope shown in each claim. That is, embodiments obtained by appropriately combining technical means modified within the scope shown in the claims are also included in the technical scope of the present invention.

Explanation of reference numerals

[0040] 1 Suspended ceiling 2 Ceiling board 6 Suspension bolt 8 Wall surface 9 Lower surface of the upper floor slab 10 Vibration-damping mechanism 20 Movable pulley unit 21 Coaxial movable pulley 30 Fixed pulley unit 31 Coaxial fixed pulley 32 Direction-changing pulley 40 Brake damper 101 First pulley group 102 Second pulley group W Wire

Claims

1. A suspended ceiling in which a ceiling board is suspended from a building body via a suspension member and a ceiling substrate, a first pulley unit having a plurality of coaxial movable pulleys fixedly held on the ceiling substrate, and a first pulley group including a first fixed pulley unit having a plurality of coaxial fixed pulleys fixedly held on the building body side so as to face the first pulley unit, a second pulley unit having a plurality of coaxial movable pulleys fixedly held on the ceiling substrate, and a second pulley group including a second fixed pulley unit having a plurality of coaxial fixed pulleys fixedly held on the building body side so as to face the second pulley unit, a wire having one end fixed to the building body side near the first fixed pulley unit of the first pulley group, spanned between the first fixed pulley unit and the first movable pulley unit, further running along the body surface for suspending the suspended ceiling via the first fixed pulley unit, reaching the second pulley group at the other end, spanned between the second fixed pulley unit and the second movable pulley unit, and fixed to the building body side near the second fixed pulley unit, braking means installed on the body surface of the building body for suspending the suspended ceiling, and applying resistance to the movement of the wire when the wire passes through the inside thereof, and comprising When an earthquake occurs and the suspended ceiling is displaced relative to the building body, the wire moves in the running direction according to the rotation of the pulleys accompanying the displacement of the first movable pulley unit and the second movable pulley unit fixedly held on the ceiling substrate. At this time, the moving amount of the wire is amplified according to the number of series of the coaxial movable pulleys with respect to the relative displacement amount generated in the suspended ceiling, and the energy input to the suspended ceiling is attenuated by passing through the braking means while the wire receives resistance corresponding to the amplified moving amount of the wire. A vibration damping ceiling characterized by this.

2. The vibration damping ceiling according to claim 1, wherein the braking means is a damper capable of following the moving amount of the wire.

3. The vibration damping ceiling according to claim 1, wherein the wire is spanned substantially horizontally between the first fixed pulley unit and the first movable pulley unit, and between the second fixed pulley unit and the second movable pulley unit.

4. The first pulley group includes a first movable pulley unit fixedly held on the ceiling base material and a first fixed pulley unit fixedly held near the suspension end of the suspension material so as to face the first movable pulley unit. The second pulley group includes a second movable pulley unit fixedly held on the ceiling base material and a second fixed pulley unit fixedly held near the suspension end of the suspension material so as to face the second movable pulley unit. The wire is obliquely spanned between the ceiling base material side and the vicinity of the suspension end side in the vibration damping ceiling according to claim 1.

5. A suspended ceiling in which a ceiling board is suspended from a building frame through a suspension material and a ceiling base material, A first pulley group including a first movable pulley unit installed on the ceiling base material and a first fixed pulley unit installed on the building frame side so as to face the first movable pulley unit, A second pulley group including a second movable pulley unit installed on the ceiling base material and a second fixed pulley unit installed on the building frame side so as to face the second movable pulley unit, A wire spanned between the first fixed pulley unit of the first pulley group and the second fixed pulley unit of the second pulley group, Braking means installed on the frame surface of the building frame for suspending the suspended ceiling, and when the wire passes through the inside, resistance is applied to the movement of the wire, Comprising, One end of the wire is fixed to the building frame side near the first fixed pulley unit of the first pulley group, spanned between the first fixed pulley unit and the first movable pulley unit, and further runs along the frame surface for suspending the suspended ceiling through the first fixed pulley unit. The other end reaches the second pulley group, is spanned between the second fixed pulley unit and the second movable pulley unit, and is fixed to the building frame side near the second fixed pulley unit. When an earthquake occurs and the suspended ceiling is displaced relative to the building frame, the wire moves in the running direction according to the rotation of the pulley accompanying the displacement of the first movable pulley unit and the second movable pulley unit fixedly held on the suspended ceiling base material. The energy input to the suspended ceiling is attenuated by passing through the braking means while receiving resistance corresponding to the moving amount of the wire at that time. A vibration damping ceiling characterized by this.

6. The amount of movement of the wire is determined by the amplification factor from the relative displacement amount, which is based on the number of coaxial movable pulleys constituting the first movable pulley unit and the number of coaxial movable pulleys constituting the second movable pulley unit. The amount of movement of the wire is amplified with respect to the relative displacement amount generated in the suspended ceiling, and the energy input to the suspended ceiling is attenuated by passing through the braking means while the wire receives resistance corresponding to the amplified amount of movement of the wire. The vibration damping ceiling according to claim 5.

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