Vibration Control System

Abstract

To effectively suppress vertical vibration of a roof frame while rationally constituting a TMD.SOLUTION: A vibration control system suppresses vertical vibration of a roof frame 3 by providing a TMD1 on the roof frame 3. An equipment support mechanism 10, which vertically movably supports equipment 5 provided on the roof frame 3 by using the equipment as a weight part 11, is provided on the TMD1. A support member 8 for supporting the equipment 5 so as to be vertically movable by overhanging from the roof frame 3 toward the equipment 5 so as to be vertically rockable and an elastic support portion 12 that vertically movably supports a position on a rocking fulcrum side of a support position of the equipment 5 on the support member 8 through elastic bodies 13, 14, are provided on the equipment support mechanism 10.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a vibration control system that uses a tuned mass damper (TMD) in a roof structure to suppress vertical vibration of the roof structure. [Background technology]

[0002] The background art of the present invention describes a technology for suppressing vibrations in a truss structure such as a roof by providing the truss structure with a vibration-damping device (TMD) configured so that at least the equipment such as a lighting unit provided on the truss structure becomes part of the weight member (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 01-118501 Summary of the Invention [Problem to be solved by the invention]

[0004] In the invention described in Patent Document 1, a pair of connecting members are installed between a pair of adjacent main beams (lower chords) in a manner that allows them to vibrate, a steel plate is installed between the connecting members, and a lighting unit and a reinforcing member are attached to the underside of the steel plate to form a vibration control device, and by appropriately selecting the mass and elastic coefficient of these members, the vibration control device is configured so that its overall natural vibration period is identical to the natural vibration period of the main beams.

[0005] In other words, in the invention described in Patent Document 1, in order to suppress the vibration of a truss structure, in order to make the natural vibration period of the entire vibration control device the same as the natural vibration period of the main girder, it is necessary to appropriately select the mass and elastic coefficient of the connecting members, lighting units, etc., which are components of the vibration control device, and therefore it takes time and effort to adjust the natural vibration period, and there is room for improvement in terms of rationally configuring the vibration control device.

[0006] In view of this situation, the main objective of the present invention is to effectively suppress vertical vibration of the roof frame while rationally configuring the TMD. [Means for solving the problem]

[0007] A first characteristic configuration of the present invention is a vibration control system that includes a TMD in a roof structure to suppress vertical vibration of the roof structure, The TMD is provided with an equipment support mechanism that supports equipment provided on the roof frame as a weight so that the equipment can move up and down freely, The equipment support mechanism includes a support member that swings up and down from the roof frame toward the equipment and supports the equipment so that it can move up and down, and an elastic support part that supports the equipment at a position on the support member that is closer to the swing fulcrum than the support position of the equipment via an elastic body so that it can move up and down, The elastic body is provided with a single elastic body that elastically deforms in response to a compressive force caused by vertical movement of the equipment from a reference position, The elastic support portion is a support structure in which the single elastic body is elastically deformed in a compressed state under a compressive force, whether the equipment is raised or lowered from the reference position, and supports the position of the swing fulcrum side of the support member via the single elastic body. 。

[0008] With this configuration, when the roof structure vibrates vertically, the equipment installed on the roof structure (for example, lighting equipment, sound equipment, or catwalks that allow for adjustment and inspection of these equipment) acts as the weight part of the TMD and moves up and down along with the up and down swing of the support member, absorbing the vertical vibration of the roof structure and thereby suppressing the vertical vibration of the roof structure. Furthermore, by adjusting the elastic modulus of the elastic body, the natural frequency of the equipment can be easily synchronized with the natural frequency of the roof structure, thereby more effectively suppressing vertical vibration of the roof structure. Furthermore, since the elastic support portion supports a position on the swing fulcrum side where the vertical movement is smaller than the support position of the equipment on the support member, it is possible to use an elastic support portion with a short vertical length and a small amount of vertical elastic displacement, compared to when the elastic support portion supports the support position of the equipment on the support member where the vertical movement is large, thereby making it possible to reduce the vertical size of the TMD. As a result, the TMD, which uses equipment installed on the roof structure as its weight, can be placed rationally within the limited space of the roof structure, while still effectively suppressing vertical vibration of the roof structure. In particular, according to the first characteristic configuration, compared to when the elastic bodies are provided with, for example, an upper-side dedicated elastic body that corresponds to up and down movement above the reference position of the equipment, and a lower-side dedicated elastic body that corresponds to up and down movement below the reference position of the equipment, it is possible to reduce the number of elastic bodies provided, thereby making it possible to miniaturize the equipment support mechanism and simplify its configuration. As a result, the TMD, which uses equipment provided on the roof frame as its weight, can be placed rationally and suitably within the limited space of the roof frame. [Brief explanation of the drawings]

[0013] [Figure 1] A side view of a main part showing the configuration of a roof frame equipped with a TMD in the first embodiment. [Figure 2] A vertical cross-sectional view of the main parts showing the configuration of the TMD and roof frame in the first embodiment. [Figure 3] A vertical cross-sectional view of the main parts showing the configuration of the TMD and roof frame in the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0014] [First embodiment] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a vibration damping system according to the present invention will be described below with reference to the drawings as an example of an embodiment of the present invention.

[0015] As shown in Figures 1 and 2, the vibration control system of the present invention is configured to suppress vertical vibration of a large-scale roof structure 3 installed in a stadium, arena, etc. by providing a TMD (Tuned Mass Damper) 1 to the roof structure 3.

[0016] As shown in Figure 1, the roof structure 3 is a cantilevered steel structure that covers the stands 41 and other structures that are provided on top of the substructure 4 that is installed to surround the field (not shown). The roof frame 3 is not limited to a cantilever type, but may be, for example, an arch type.

[0017] As shown in Figures 1 and 2, the roof frame 3 is provided with multiple truss beams 31 as main girders. Each truss beam 31 is composed of a pair of upper chords 31A on the left and right, a single lower chord 31B, and multiple diagonal members 31C that connect them. Circular steel pipes are used for each of the upper chord 31A, lower chord 31B, and diagonal members 31C. The main girders of the roof structure 3 are not limited to the truss beams 31, but may also be, for example, H-shaped steel beams. Each truss beam 31 may be constructed by connecting a single upper chord member and a single lower chord member with multiple diagonal members spanning them, and each of the upper chord member 31A, lower chord member 31B, and diagonal member 31C may be made of materials other than circular steel pipes, such as square steel pipes or H-shaped steel beams.

[0018] As shown in Figures 1 and 2, the roof structure 3 includes a plurality of girders 32 (see Figure 2) that connect the upper chord members 31A, and a plurality of connecting members 33 (see Figure 1) that connect one end of each truss beam 31 to a support column 42 (see Figure 1) provided on the outer periphery of the substructure 4. H-shaped steel is used for each girder 32, and circular steel pipes are used for each connecting member 33. Note that the materials for each girder 32 are not limited to H-shaped steel, but may be channel steel, for example. The materials for each connecting member 33 are not limited to circular steel pipes, but may be square steel pipes or H-shaped steel, for example.

[0019] As shown in FIGS. 1 and 2, the roof frame 3 is provided with a catwalk 5 that is used when adjusting or inspecting lighting equipment, sound equipment, and the like (not shown) installed on the roof frame 3.

[0020] As shown in Figure 2, the catwalk 5 is provided on the roof frame 3 so as to pass between a pair of upper chord members 31A and lower chord members 31B of each truss beam 31 and between adjacent diagonal members 31C. In more detail, the catwalk 5 is provided with a main frame 51 extending in a direction perpendicular to each truss beam 31, a plurality of horizontal braces (not shown) arranged on the floor surface of the catwalk 5, and expanded metal (not shown) that forms the floor surface of the catwalk 5. The main frame 51 is formed in a ladder shape by connecting a pair of main members 51A made of H-shaped steel that are arranged in parallel at a predetermined interval in the extension direction of the truss beam 31 with a plurality of connecting members 51B made of H-shaped steel. The main members 51A and connecting members 51B of the main frame 51 are not limited to H-shaped steel, but may be made of channel steel, for example. The horizontal braces 43 may be made of round steel bars or L-shaped steel, for example, and the floor of the catwalk 5 is not limited to expanded metal, but may be made of perforated steel plates, for example.

[0021] The TMD 1 is configured in a form in which a catwalk 5, which is an example of equipment provided on the roof frame 3, serves as the weight 11. More specifically, the TMD 1 is provided with a plurality of equipment support mechanisms 10 that support the catwalk 5 as the weight 11 so that it can move up and down. Each equipment support mechanism 10 is provided with a support member 8 that springs out from the roof frame 3 toward the catwalk 5 so that it can swing up and down and supports the catwalk 5 so that it can move up and down, and an elastic support part 12 that supports a position on the support member 8 that is closer to the swing fulcrum than the support position of the catwalk 5 so that it can move up and down via upper and lower elastic bodies 13, 14.

[0022] Each support member 8 is connected to a support column 34 spanning the lower chord 31B and girder 32 of the roof frame 3 via a fulcrum pin 35 provided parallel to the girder 32 so as to be able to swing up and down. The upper ends of each vertical member 55 extending upward from a pair of main members 51A of the catwalk 5 are connected to the free end of each support member 8. As a result, each support member 8 is configured to support the catwalk 5 at its free end. Since the protruding direction of each support member 8 is set in the opposite direction to the extension direction of the cantilever-type roof frame 3, the beam width of each truss beam 31 at the catwalk arrangement portion where the catwalk 5 supported on the free end side of each support member 8 is arranged is larger than when the support member 8 protrudes in the same direction as the extension direction of the roof frame 3, and this ensures a wider space in the roof frame 3 for arranging the catwalk 5.

[0023] The elastic support section 12 includes an upper support member 15 installed on a pair of upper chord members 31A of each truss beam 31, an intermediate support member 16 provided at a position on the support member 8 closer to the swing fulcrum than the support position of the catwalk 5, and a lower support member 17 provided on the lower chord member 31B of each truss beam 31. The intermediate support member 16 is provided to be rotatable relative to the support member 8 via a support pin 18 provided parallel to the fulcrum pin 35.

[0024] Of the upper and lower elastic bodies 13, 14, the upper elastic body 13 is provided in a pre-compressed state between the upper support member 15 and the middle support member 16 of the elastic support part 12 so that it is compressed and elastically deformed when the catwalk 5 rises. The lower elastic body 14 is provided in a pre-compressed state between the middle support member 16 and the lower support member 17 of the elastic support part 12 so that it is compressed and elastically deformed when the catwalk 5 descends. The upper and lower elastic bodies 13, 14 support the catwalk 5 via the support member 8 etc. so that the catwalk 5 returns to its reference position by their mutual elasticity.

[0025] Each elastic body 13, 14 is composed of a pair of coil springs 13A, 14A aligned in the extension direction of the support member 8. The upper end of each coil spring 13A of the upper elastic body 13 is supported by an upper support member 15 having a steel plate extending over its upper end. The lower end of each coil spring 13A of the upper elastic body 13 is supported by an upper end of an intermediate support member 16 having a steel plate extending over its lower end. The upper end of each coil spring 14A of the lower elastic body 14 is supported by a lower end of an intermediate support member 16 having a steel plate extending over its upper end. The lower end of each coil spring 14A of the lower elastic body 14 is supported by a lower support member 17 having a steel plate extending over its lower end. The upper and lower elastic bodies 13 and 14 are not limited to those constituted by a pair of coil springs 13A and 14A, but may be constituted by a single coil spring or a rubber block.

[0026] With the above configuration, when the roof structure 3 vibrates vertically, the catwalk 5 acts as the weight part 11 of the TMD 1 and moves up and down in response to this vertical vibration along with the up and down swing of the support member 8, thereby absorbing the vertical vibration of the roof structure 3, thereby suppressing the vertical vibration of the roof structure 3.

[0027] In addition, by adjusting the elastic modulus of each elastic body 13, 14 (each pair of coil springs 13A, 14A), the natural frequency of the catwalk 5 can be easily synchronized with the natural frequency of the roof structure 3, thereby more effectively suppressing vertical vibration of the roof structure 3.

[0028] When the catwalk 5 rises in response to the vertical vibration of the roof frame 3, the rise of the support member 8 accompanying this rise elastically deforms the upper elastic body 13 arranged above the support member 8 in the elastic support part 12 that supports the support member 8, and the lower elastic body 14 arranged below the support member 8 maintains a state in which it receives and supports the support member 8 from below with its elasticity. When the catwalk 5 descends in response to the vertical vibration of the roof frame 3, the rise of the support member 8 accompanying this rise elastically deforms the lower elastic body 14 arranged below the support member 8 in the elastic support part 12, and the upper elastic body 13 arranged above the support member 8 maintains a state in which it receives and supports the support member 8 from above with its elasticity.

[0029] In other words, when the catwalk 5 moves up and down in response to the vertical vibration of the roof structure 3, the upper elastic body 13 and the lower elastic body 14, which support the catwalk 5 via support members 8 etc., elastically deform in opposite directions via the support members 8 in response to the up and down movement of the catwalk 5, and their mutual elasticity returns the catwalk 5 to its reference position via the support members 8 etc.

[0030] As a result, when the catwalk 5 moves up and down in response to the vertical vibration of the roof structure 3, the upper elastic body 13 and the lower elastic body 14 stably support the catwalk 5 and return the catwalk 5 to its reference position while efficiently damping the up and down movement of the catwalk 5 in response to the vertical vibration of the roof structure 3.This allows the vertical vibration of the roof structure 3 to be damped along with the up and down movement of the catwalk 5, and the vertical vibration of the roof structure 3 to be quickly suppressed.

[0031] Furthermore, in TMD1, the position on the swing fulcrum side, which has a smaller vertical movement amount than the support position of the catwalk 5 on the support member 8, is supported by the elastic support part 12, so the vertical size of TMD1 can be made smaller than when the support position of the catwalk 5, which has a larger vertical movement amount on the support member 8, is supported.

[0032] Furthermore, as mentioned above, by setting the protruding direction of each support member 8 in the opposite direction to the extension direction of the cantilever-type roof frame 3, a wide space can be secured for arranging the catwalk 5 on the roof frame 3, and since the up and down movement of the catwalk 5 is restricted by the upper and lower elastic bodies 13, 14 of the elastic support part 12, even if a TMD 1 with the catwalk 5 as the weight part 11 is provided in the limited space of the roof frame 3, it is possible to prevent the catwalk 5 from interfering with the truss beams 31 etc. due to its up and down movement.

[0033] Furthermore, since the elastic support portion 12 supports the swing fulcrum side of the support member 8, even if the load acting on the upper and lower elastic bodies 13, 14 provided on the elastic support portion 12 becomes large, the upper and lower elastic bodies 13, 14 are composed of a pair of coil springs 13A, 14A aligned in the extension direction of the support member 8, so the load acting on each elastic body 13, 14 is distributed to the pair of coil springs 13A, 14A and the load borne by each coil spring 13A, 14A is reduced, so that the swing fulcrum side of the support member 8 can be supported suitably.

[0034] Furthermore, since each equipment support mechanism 10 that supports the catwalk 5 is provided in the inverted triangular internal space formed by a pair of upper chords 31A on the left and right sides and a single lower chord 31B in each truss beam 31, the appearance when looking up at the roof structure 3 from a stand 41, etc., can be improved compared to when each equipment support mechanism 10 is exposed to the outside of each truss beam 31.

[0035] In other words, the TMD 1, which uses the catwalk 5 provided on the roof structure 3 as the weight part 11, can be arranged in a rational and attractive manner in the limited space of the roof structure 3, while effectively and quickly suppressing vertical vibration of the roof structure 3.

[0036] In this first embodiment, an example is given in which the upper ends of each upper coil spring 13A provided on the elastic support portion 12 are supported by upper support members 15 spanning a pair of upper chord members 31A of each truss beam 31, and the lower ends of each lower coil spring 14A are supported by lower support members 17 provided on the lower chord members 31B of each truss beam 31. However, this is not limited to this, and for example, each truss beam 31 may be provided with an inverted triangular support truss spanning each pair of upper chord members 31A and lower chord members 31B, and the upper ends of each upper coil spring 13A may be supported by upper spring support portions provided at the top of this support truss, and the lower ends of each lower coil spring 14A may be supported by lower spring support portions provided at the bottom of the support truss.

[0037] Second Embodiment Hereinafter, as one example of an embodiment for carrying out the present invention, a second embodiment of a vibration control system according to the present invention will be described with reference to the drawings. The vibration damping system illustrated in this second embodiment differs from the vibration damping system illustrated in the first embodiment in the configuration of the elastic support portion, and therefore, only the configuration of the elastic support portion will be described below.

[0038] As shown in Figure 3, each equipment support mechanism 10 of the TMD1 is equipped with the aforementioned support member 8 and an elastic support part 22 that supports the support member 8 at a position closer to the swing fulcrum than the support position of the catwalk 5 via a single elastic body 23, allowing it to move up and down freely.

[0039] The elastic body 23 elastically deforms in response to the compressive force caused by the vertical movement of the catwalk 5 from the reference position. The elastic body 23 is composed of a pair of coil springs 23A aligned in the extension direction of the support member 8. Each coil spring 23A is supported by a spring support 24 provided at a position on the support member 8 closer to the swing fulcrum than the support position of the catwalk 5.

[0040] The spring support 24 includes a vertical member 24B rotatably mounted on the support member 8 via a support pin 24A provided parallel to the fulcrum pin 35, upper and lower spring receiving members 24C and 24D movable relative to the vertical member 24B in the vertical direction, an upper stopper 24E fixed to the upper end of the vertical member 24B and receiving the upper spring receiving member 24C at its upper limit position, and a lower stopper 24F fixed to the lower side of the vertical member 24B and receiving the lower spring receiving member 24D at its lower limit position. The spring support 24 receives and supports the upper end of each coil spring 23A with the upper spring receiving member 24C, and receives and supports the upper end of each coil spring 23A with the lower spring receiving member 24D.

[0041] The upper and lower ends of each coil spring 23A are configured to be received by spring receivers 25 provided between the catwalk 5 and the support column 34 of each truss beam 31 via upper and lower spring receiver members 24C, 24D of the spring support body 24. The spring receivers 25 are provided across a pair of upper chord members 31A of each truss beam 31. The spring receivers 25 are provided with upper spring receivers 25A that receive the upper ends of each coil spring 23A when the catwalk 5 moves up and down above the reference position, and lower spring receivers 25B that receive the lower ends of each coil spring 23A when the catwalk 5 moves up and down below the reference position.

[0042] With the above configuration, when the roof structure 3 vibrates vertically, the catwalk 5 acts as the weight part 11 of the TMD 1 and moves up and down in response to this vertical vibration along with the up and down swing of the support member 8, thereby absorbing the vertical vibration of the roof structure 3, thereby suppressing the vertical vibration of the roof structure 3.

[0043] In addition, by adjusting the elastic modulus of the elastic body 23 (a pair of coil springs 23A), the natural frequency of the catwalk 5 can be easily synchronized with the natural frequency of the roof structure 3, thereby more effectively suppressing vertical vibration of the roof structure 3.

[0044] When the catwalk 5 rises from the reference position in response to vertical vibration of the roof frame 3, the vertical member 24B of the spring support 24 rises together with the support member 8 in accordance with this rise, pushing up the lower spring receiving member 24D via the lower stopper 24F fixed to the lower side of the vertical member 24B, whereby the elastic body 23 (pair of coil springs 23A) is elastically deformed with its upper end portion received by the upper spring receiving portion 25A of the spring receiving body 25 via the upper spring receiving member 24C. When the catwalk 5 falls from the reference position in response to vertical vibration of the roof frame 3, the vertical member 24B of the spring support 24 falls together with the support member 8 in accordance with this descent, pulling down the upper spring receiving member 24C via the upper stopper 24E fixed to its upper end portion, whereby the elastic body 23 (pair of coil springs 23A) is elastically deformed with its lower end portion received by the lower spring receiving portion 25B of the spring receiving body 25 via the lower spring receiving member 24D. Furthermore, as the elastic body 23 (a pair of coil springs 23A) elastically deforms in this manner, the vertical vibration of the roof structure 3 is damped along with the up and down movement of the catwalk 5, thereby enabling the vertical vibration of the roof structure 3 to be quickly suppressed.

[0045] In other words, in the vibration control system illustrated in the second embodiment, the same effects as those of the vibration control system illustrated in the first embodiment can be obtained, and since the single elastic body 23 provided in the elastic support part 22 corresponds to the up and down movement on both the upper and lower sides from the reference position of the catwalk 5, it is possible to simplify the configuration of the elastic support part 22 by reducing the number of elastic bodies 23 provided, compared to, for example, a case in which upper and lower elastic bodies are provided that correspond separately to the up and down movement on the upper side and the lower side from the reference position.

[0046] [Another embodiment] Another embodiment of the present invention will now be described. The configurations of the other embodiments described below are not limited to being applied alone, but can also be applied in combination with the configurations of the above-described embodiment or other other embodiments.

[0047] (1) In each of the above embodiments, the vibration control system is exemplified as one in which a row of catwalks 5 provided on the roof structure 3 is configured as the weight portion 11 of the TMD1. However, the present invention is not limited to this, and may be, for example, one in which two rows of catwalks 5 provided on the roof structure 3 are configured as the weight portion 11 of the TMD1.

[0048] (2) In each of the above embodiments, the catwalk 5, one of the various pieces of equipment provided on the roof structure 3, is used as the weight portion 11 of the TMD1. However, this is not limited to this. For example, one of the various pieces of equipment provided on the roof structure 3, such as lighting equipment or sound equipment excluding the catwalk 5, may be used as the weight portion 11 of the TMD1, or multiple pieces of lighting equipment, sound equipment, etc. including the catwalk 5 may be used as the weight portion 11 of the TMD1. [Explanation of symbols]

[0049] 1. TMD 3 Roof frame 5 Catwalk (facility) 8 Support member 10 Support mechanism for equipment 11 Weight 12 Elastic support part 13 Upper elastic body 14 Lower elastic body 23 Elastic Body

Claims

[Claim 1] A vibration control system that includes a TMD in a roof structure to suppress vertical vibration of the roof structure, The TMD is provided with an equipment support mechanism that supports equipment provided on the roof frame as a weight so that the equipment can move up and down, The equipment support mechanism includes a support member that swings up and down from the roof frame toward the equipment and supports the equipment so that it can move up and down, and an elastic support part that supports the equipment at a position on the support member that is closer to the swing fulcrum than the support position of the equipment via an elastic body so that it can move up and down, The elastic body is provided with a single elastic body that elastically deforms in response to a compressive force caused by vertical movement of the equipment from a reference position, The elastic support portion is a support structure in which the single elastic body is elastically deformed in a compressed form under compressive force whether the equipment is rising or falling from the reference position, and the vibration control system supports the position of the swing fulcrum side of the support member via the single elastic body.

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