Anti-vibration foundation

Abstract

To provide a preventive foundation capable of enhancing an anti-prevention effect at a specific frequency with a simple configuration.SOLUTION: An anti-vibration foundation 1 that reduces vertical vibration transmitted from a floor member 2 to a lower structure 3 installed on the ground, has: a floating foundation body 4 supported to the lower structure 3 by a first spring member 6 so as to be relatively movable in a vertical direction, and to which the vertical vibration of the floor member 2 is input; and a floating foundation connection body 5 connected to the floating foundation body 4 by a second spring member 9 so as to be relatively movable in the vertical direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a vibration isolation foundation that reduces vertical vibrations transmitted from floor members to a substructure installed on the ground. [Background technology]

[0002] For example, in factories where equipment that generates large vibrations is installed, and live music venues where vertical vibrations occur, it has been proposed to use vibration-isolating foundations, also known as floating foundations, which are supported by spring members on the lower structure so that they can move freely in the vertical direction relative to the lower structure, in order to reduce the vertical vibrations that are transmitted from the floor members to the lower structure installed on the ground.

[0003] A known example of such a vibration-isolating foundation is one that has a rotary inertia mass damper arranged in parallel with a spring member between the lower structure and the foundation, thereby enhancing the vibration-isolating effect at specific vibration frequencies, such as the vertical vibrations that occur in live music venues (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 4936174 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the rotary inertia mass dampers used in the above-mentioned conventional vibration-isolation foundations are configured so that the rotor rotates when the vibration-isolation foundation moves up and down relative to the substructure, generating rotational inertia. As a result, the dampers are expensive and have a complex design, which increases the cost of the vibration-isolation foundation.

[0006] The present invention has been made in consideration of the above problems, and an object of the present invention is to provide a vibration prevention base that is capable of increasing the vibration isolation effect at a specific vibration frequency with a simple structure. [Means for solving the problem]

[0007] The vibration-proof foundation of the present invention is a vibration-proof foundation that reduces vertical vibrations transmitted from a floor member to a lower structure installed on the ground, and includes a floating foundation main body that is supported by a first spring member so as to be movable relative to the lower structure in the vertical direction and to which the vertical vibrations of the floor member are input, and a floating foundation connector that is connected to the floating foundation main body by a second spring member so as to be movable relative to the floating foundation in the vertical direction. The floating foundation connector is disposed between the floor member and the floating foundation body. It is characterized by:

[0008] The vibration-isolating foundation of the present invention is A vibration-isolation foundation that reduces vertical vibrations transmitted from a floor member to a lower structure installed on the ground, comprising: a floating foundation main body that is supported by a first spring member so as to be movable relative to the lower structure in the vertical direction and to which the vertical vibrations of the floor member are input; and a floating foundation connector that is connected to the floating foundation main body by a second spring member so as to be movable relative to the floating foundation main body in the vertical direction; The floating foundation body is a beam member that is supported by a plurality of the first spring members and supports the floating foundation connected body between a pair of the first spring members, and is configured to function as the second spring member by bending in the vertical direction between the pair of the first spring members. Characterized by . Effect of the Invention

[0009] According to the present invention, it is possible to provide a vibration prevention base that is capable of increasing the vibration isolation effect at a specific vibration frequency with a simple configuration. [Brief description of the drawings]

[0010] [Figure 1] 1 is a diagram showing an outline of the configuration of a vibration-isolating foundation according to one embodiment of the present invention; [Diagram 2] FIG. 2 is a diagram showing a schematic vibration model of the vibration-isolation foundation shown in FIG. [Diagram 3] FIG. 13 is a schematic diagram showing a vibration model of a vibration-isolation foundation of a comparative example that does not have a floating foundation connector. [Figure 4] 1 is a characteristic diagram showing a comparison of the vibration damping characteristics of the vibration-isolating foundation of the embodiment with the vibration damping characteristics of the vibration-isolating foundation of the comparative example. [Diagram 5] 2 is a diagram illustrating an outline of the configuration of a vibration-isolating foundation according to a modified example of the vibration-isolating foundation shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, a vibration-isolating foundation 1 according to one embodiment of the present invention will be described in detail with reference to the drawings.

[0012] A vibration-isolating foundation 1 shown in FIG. 1 is intended to reduce vertical vibrations transmitted from a floor member 2 of a building or the like to a substructure 3 installed on the ground.

[0013] The vibration-isolating foundation 1 can be applied to buildings used in applications where vertical vibrations are applied to the floor member 2, such as factories where equipment that generates large vibrations is installed, and live music venues where vertical vibrations occur. In this embodiment, the vibration-isolating foundation 1 is applied to the floor member 2 of a live music venue.

[0014] The floor member 2 is, for example, a reinforced concrete structure, but may be of other structures. The lower structure 3 is, for example, a concrete outer foundation secured to the ground by pouring concrete, but may be of other structures as long as it is secured to the ground and can support the vibration-proof foundation 1.

[0015] The vibration-isolating foundation 1 is provided between a floor member 2 and a substructure 3 , and has a floating foundation main body 4 and a floating foundation connector 5 .

[0016] The floating foundation main body 4 is supported by the lower structure 3 so as to be movable vertically relative to the lower structure 3 by the first spring members 6. In this embodiment, the floating foundation main body 4 is supported by a plurality of first spring members 6 arranged side by side at intervals from each other in the horizontal direction. The floating foundation main body 4 can move (vibrate) vertically relative to the lower structure 3 as the first spring members 6 elastically deform.

[0017] The floating foundation body 4 may be made of, for example, a concrete block, but may be made of other materials such as steel as long as it has a predetermined weight. The first spring member 6 may be of various configurations, such as an air spring or a configuration in which multiple disc springs are stacked vertically. The vibration-proof foundation 1 may also be configured such that a first damping device such as an oil damper (indicated by the reference symbol D1 in FIG. 2) is provided between the lower structure 3 and the floating foundation body 4.

[0018] The floating foundation body 4 is connected to the floor member 2 by multiple support columns 7, and is adapted to receive vertical vibrations from the floor member 2. For example, when audience members 8 at a live music venue perform a so-called vertical movement, such as jumping as a group, the vertical vibrations caused by the vertical movement are input from the floor member 2 through the support columns 7 to the floating foundation body 4.

[0019] The floating base connector 5 is connected to the floating base main body 4 by the second spring members 9 so as to be movable relative to the floating base main body 4 in the vertical direction. In this embodiment, the floating base connector 5 is disposed between the floor member 2 and the floating base main body 4, and is connected (supported) to the floating base main body 4 by a plurality of second spring members 9 arranged side by side at intervals from each other in the horizontal direction. The floating base connector 5 can move (vibrate) relative to the floating base main body 4 in the vertical direction as a result of the second spring members 9 being elastically deformed. Note that the floating base connector 5 is provided with a plurality of through holes 5a, and the plurality of support columns 7 connecting the floor member 2 and the floating base main body 4 each pass through the corresponding through holes 5a.

[0020] In addition, the vibration-proof foundation 1 may be configured such that the floating foundation connector 5 is placed between the lower structure 3 and the floating foundation main body 4 and is suspended below the floating foundation main body 4 by the second spring member 9.

[0021] In this embodiment, the floating base connector 5 is arranged between the floor member 2 and the floating base main body 4. Therefore, compared to a configuration in which the floating base connector 5 is supported by hanging it below the floating base main body 4 by the second spring member 9, the configuration of the second spring member 9 can be simplified while the floating base connector 5 can be reliably supported on the floating base main body 4 by the second spring member 9.

[0022] The floating foundation connector 5 may be made of, for example, a concrete block, but may be made of other materials such as steel as long as it has a predetermined weight. The second spring member 9 may be of various configurations, such as an air spring or a configuration in which multiple disc springs are stacked vertically. The vibration-proof foundation 1 may also be configured such that a second damping device such as an oil damper (shown by the reference symbol D2 in FIG. 2) is provided between the floating foundation main body 4 and the floating foundation connector 5.

[0023] As shown as a vibration model in Fig. 2, when the floor member 2 is excited with an excitation force f0 due to vibrations such as vertical vibrations from spectators 8, the vibrations are transmitted to the floating foundation main body 4 via the support columns 7, causing the floating foundation main body 4 to elastically deform the first spring member 6 and vibrate in the vertical direction, and the vibration of the floating foundation main body 4 is transmitted, causing the floating foundation connector 5 to elastically deform the second spring member 9 and vibrate in the vertical direction, thereby reducing the vibration transmitted from the floor member 2 to the lower structure 3, i.e., the transmission force f transmitted from the floor member 2 to the lower structure 3. This makes it possible to suppress the vibration applied to the floor member 2 from being transmitted to other surrounding buildings through the ground.

[0024] In addition, the vibration-proof foundation 1 has a two-stage structure in which the floating foundation main body 4, which is supported on the substructure 3 by the first spring member 6, and the floating foundation connector 5, which is supported by the second spring member 9, have vibration damping characteristics with an antipole point (downward notch) P3 of the primary vibration mode and the secondary vibration mode between the resonance point P1 of the primary vibration mode and the resonance point P2 of the secondary vibration mode, as shown in Fig. 4. Therefore, the weight of the floating foundation main body 4, the weight of the floating foundation connector 5, the spring constant of the first spring member 6, and the spring constant of the second spring member 9 are adjusted so that the antipole point P3 of the vibration of the vibration applied to the floor member 2 coincides with a specific range of vibrations for which the vibration-proofing effect is particularly desired to be enhanced, and when the first damping device D1 and the second damping device D2 are provided, their damping forces are further set, thereby making it possible to further enhance the vibration-proofing effect of the vibration-proof foundation 1 at the specific vibration frequency, compared to a general vibration-proof foundation 20 not provided with the floating foundation connector 5 shown as a comparative example in Fig. 3.

[0025] In particular, by setting the weight of the floating foundation connecting body 5 to be greater than the weight of the floating foundation main body 4 and by setting the spring constant of the second spring member 9 to be greater than the spring constant of the first spring member 6, it is possible to obtain a higher vibration-proofing effect at a lower vibration frequency compared to the vibration-proof foundation 20 of the comparative example shown in Figure 3.

[0026] In addition, the vibration-proof foundation 20 of the comparative example, which does not have the floating foundation connector 5 shown in Figure 3, is configured in such a way that a floating foundation 21, having the total weight of the floating foundation main body 4 and the floating foundation connector 5 of this embodiment, is supported on the lower structure 3 by a first spring member 6 and a first damping device D1 having the same spring constant or damping force as those of this embodiment.

[0027] Furthermore, the vibration-isolation foundation 1 of this embodiment has a simpler configuration than a general vibration-isolation foundation 20, in that the floating foundation connector 5 is supported by the floating foundation main body 4 via the second spring member 9. Therefore, compared to the vibration-isolation foundation 20 of the comparative example shown in Fig. 3 in which a rotational inertia mass damper described as the prior art in Patent Document 1 is provided between the lower structure 3 and the floating foundation 21, it is not necessary to provide a rotational inertia mass damper, which is expensive and has a complicated design, and the vibration-isolation foundation 1 can be made to have a simpler and cheaper configuration while still achieving a higher vibration-isolation effect in the relevant frequency range.

[0028] In this embodiment, the weight of the floating foundation main body 4, the weight of the floating foundation connecting body 5, the spring constant of the first spring member 6, the spring constant of the second spring member 9, and the damping forces of the first damping device D1 and the second damping device D2 of the vibration-proof foundation 1 are set so that the anti-pole point P3 coincides with the range of vertical vibrations of 2 Hz to 3 Hz that will be applied to the floor member 2 of the live music house when an audience member 8 moves vertically.

[0029] More specifically, in the vibration-isolation foundation 1 of this embodiment, the floating foundation main body 4 is supported on the lower structure 3 using the same first spring member 6 and first damping device D1 as those in the vibration-isolation foundation 20 of the comparative example shown in Figure 3, and the weight of the floating foundation main body 4 is set to be smaller than the weight of the floating foundation 21 of the vibration-isolation foundation 20 of the comparative example (for example, 1 / 10 of the weight of the floating foundation 21), the weight of the floating foundation connector 5 is set to be smaller than the weight of the floating base 21 of the vibration-isolation foundation 20 of the comparative example (for example, 9 / 10 of the weight of the floating base 21), the spring constant of the second spring member 9 is set to be higher than the spring constant of the first spring member 6, and the damping force of the second damping device D2 is set to be lower than the damping force of the first damping device D1, so that the anti-pole point P3 is within the range of 2 Hz to 3 Hz that will be applied to the floor member 2 of the live music house when the audience 8 are moving vertically, as shown in Figure 4.

[0030] As a result, the vibration-isolation foundation 1 exhibits a higher vibration-isolation effect within the range of 2 Hz to 3 Hz that will be applied to the floor member 2 of the live music venue when audience members 8 are moving vertically, compared to the vibration-isolation foundation 20 of the comparative example shown in Figure 3 and a conventional vibration-isolation foundation equipped with a rotational inertia mass damper, and can effectively prevent vertical vibrations from being transmitted through the ground to other surrounding buildings, etc.

[0031] As shown as a modified example in Figure 5, the vibration-proof foundation 1 can also be configured so that the floating foundation main body 4 is supported by a plurality of first spring members 6 and is composed of a beam member that supports the floating foundation connector 5 between a pair of first spring members 6, and functions as a second spring member 9 by bending in the vertical direction between the pair of first spring members 6.

[0032] In this modified example, the floating foundation body 4 can be configured with a steel beam member such as an H-shaped steel. Also, a support base 10 can be provided on the upper surface of the floating foundation body 4 at the intermediate position between the adjacent first spring members 6, and the floating foundation connector 5 can be configured to be supported by the support base 10 at the intermediate position between the adjacent first spring members 6 of the floating foundation body 4.

[0033] With this configuration, when the floor member 2 is vibrated by vibrations such as vertical vibrations from spectators 8, the vibrations are transmitted to the floating base main body 4 via the support columns 7, causing the floating base main body 4 to elastically deform the first spring members 6 and vibrate in the vertical direction.In addition, the floating base main body 4 bends in the vertical direction between the pair of first spring members 6, causing the floating base connector 5 to vibrate in a mode different from that of the floating base main body 4, thereby reducing the vibrations transmitted from the floor member 2 to the lower structure 3.

[0034] Also, since there is no need to use a separate member such as an air spring as the second spring member 9, the vibration-proof foundation 1 can be simplified in configuration and its costs can be further reduced. In particular, when the floating foundation body 4 is made of H-shaped steel, its costs can be further reduced.

[0035] Furthermore, by configuring the floating foundation connector 5 to be supported at the intermediate position of adjacent first spring members 6 of the floating foundation main body 4 via a support base 10 arranged on the upper surface at the intermediate position of adjacent first spring members 6 of the floating foundation main body 4, the floating foundation connector 5 can vibrate efficiently due to the deflection of the floating foundation main body 4, thereby further enhancing the vibration-proofing effect of the vibration-proof foundation 1.

[0036] The present invention is not limited to the above-described embodiment, and it goes without saying that various modifications can be made without departing from the spirit and scope of the present invention.

[0037] For example, the above embodiment shows the case where the vibration-isolating foundation 1 is applied to the floor member 2 of a live music venue, but it may also be applied to the floor member 2 of other buildings used in applications where the floor member 2 is subjected to vertical vibrations, such as factories where equipment that generates large vibrations is installed. Furthermore, the vibration-isolating foundation 1 may also be applied to the floor member 2 of structures other than buildings, such as outdoor stages. [Explanation of symbols]

[0038] 1. Vibration-proof foundation 2 Flooring 3. Undercarriage 4 Floating foundation body 5 Floating foundation connection 5a through hole 6 First spring member 7 Support pillar 8. Spectators 9 Second spring member 10 Support stand 20 Vibration-proof foundation 21 Floating foundation D1 First damping device D2 Second damping device P1 Resonance point of the first vibration mode P2 Resonance point of the second vibration mode P3 Antipole

Claims

1. A vibration-proof foundation that reduces vertical vibrations transmitted from a floor member to a substructure installed on the ground, a floating foundation main body that is supported by the lower structure by a first spring member so as to be movable relative to the lower structure in the vertical direction and to which vertical vibration of the floor member is input; A floating base connector connected to the floating base body by a second spring member so as to be relatively movable in the vertical direction, A vibration-isolating foundation characterized in that the floating foundation connector is arranged between the floor member and the floating foundation main body.

2. A vibration-isolating foundation that reduces vertical vibrations transmitted from a floor member to a substructure installed on the ground, a floating foundation main body that is supported by the lower structure by a first spring member so as to be movable relative to the lower structure in the vertical direction and to which vertical vibration of the floor member is input; A floating base connector connected to the floating base body by a second spring member so as to be relatively movable in the vertical direction, The vibration-isolation foundation is characterized in that the floating foundation main body is a beam member that is supported by a plurality of the first spring members and supports the floating foundation connector between a pair of the first spring members, and is configured to function as the second spring member by bending in the vertical direction between the pair of the first spring members.

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