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 TMD 1 on the roof frame 3. The TMD 1 is constituted so as to use a catwalk 5 supported by the roof frame 3 as a weight part 11.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 includes a truss structure such as a roof that is equipped with a vibration control device that uses a lighting unit provided on the truss structure as a weight member to suppress vibration of the truss structure (see, for example, Patent Document 1). Furthermore, there are TMD mechanisms for beam strings that are configured to suppress vertical vibration of the beam strings by providing an inertial mass damper, which is a dedicated weight part (see, for example, Patent Document 2). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 01-118501 [Patent Document 1] Patent No. 5316854 Summary of the Invention [Problem to be solved by the invention]

[0004] In the configuration described in Patent Document 1, lighting units are used as the weights of a vibration control device that suppresses vibrations of a truss structure such as a roof, allowing for a more rational configuration of the vibration control device compared to a case where a dedicated weight is provided. However, since the mass of the lighting units is small compared to the truss structure such as a roof, the effect of suppressing vibrations of the truss structure is reduced. Furthermore, since lighting units are scattered throughout the truss structure, using them as the weights of a vibration control device results in partial action on the truss structure, making it difficult to say that they are suitable for suppressing vibrations of the truss structure. There is room for improvement in terms of effectively suppressing vibrations of truss structures.

[0005] In the configuration described in Patent Document 2, the TMD mechanism is equipped with an inertial mass damper that serves as a dedicated weight, which effectively suppresses vibrations in the truss structure. However, there is room for improvement in rationally configuring the TMD mechanism.

[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 configured in a form in which the catwalk supported by the roof frame serves as a weight part. 、 The roof frame has a plurality of truss beams provided as main beams, which extend in a cantilevered manner from the outer edge of the roof frame and are arranged at predetermined intervals in a direction along the outer edge of the roof frame, The catwalk is formed in a long shape that extends continuously across a plurality of truss beams in the arrangement direction of the truss beams and is supported on the extending end side of the truss beams. It's at the point.

[0008] With this configuration, when the roof structure vibrates vertically, the catwalk, which has a relatively large mass and is continuously attached to the roof structure to enable adjustment and inspection of lighting and sound equipment installed on the roof structure, vibrates vertically as the weight part of the TMD in response to this vertical vibration, absorbing the vertical vibration of the roof structure and thereby effectively suppressing the vertical vibration of the roof structure. In other words, by using the catwalk, which has a relatively large mass and is continuously attached to the roof structure, as the weight of the TMD, it is possible to effectively suppress vertical vibration of the roof structure with a rational configuration that does not require a dedicated weight.

[0009] The second characteristic configuration of the present invention is that the TMD is configured to harmonize the natural frequency of the catwalk with the natural frequency of the roof structure by adjusting at least one of the mass and rigidity of the catwalk.

[0010] According to this configuration, for example, the natural frequency of the catwalk can be synchronized with the natural frequency of the roof structure by selecting the type and size of steel material to be used for the catwalk and adjusting either or both of the mass and rigidity of the catwalk according to the natural frequency of the roof structure that has been assumed in advance. As a result, when the roof structure vibrates vertically, the catwalk acts as the weight part of the TMD and vibrates vertically in sync with the vertical vibration of the roof structure, thereby absorbing the vertical vibration of the roof structure more effectively, thereby more effectively suppressing the vertical vibration of the roof structure. As a result, vertical vibration of the roof frame can be suppressed more rationally and effectively.

[0011] A third characteristic feature of the present invention is that the main frame of the catwalk is provided with mass adjustment means for adjusting the mass of the catwalk.

[0012] According to this configuration, by adjusting the mass of the catwalk using the mass adjusting means, the natural frequency of the catwalk can be easily and accurately synchronized with the natural frequency of the roof frame. As a result, when the roof structure vibrates vertically, the catwalk acts as the weight part of the TMD and vibrates vertically in precise synchronization with the vertical vibration of the roof structure, thereby absorbing the vertical vibration of the roof structure more effectively, thereby more effectively suppressing the vertical vibration of the roof structure. As a result, vertical vibration of the roof frame can be suppressed simply and effectively.

[0013] A fourth characteristic configuration of the present invention is the roof structure and the catwalk. Lord of Between the frame , damping vertical vibration of the roof frame The feature is that a damping material is provided. A fifth characteristic feature of the present invention is that the damping material is bridged between the roof frame and the main frame in an attitude inclined in the extending direction of the catwalk. A sixth characteristic configuration of the present invention is that the damping material is installed in a V-shape between adjacent truss beams, spanning the upper chords of the truss beams and the main frame of the catwalk.

[0014] With this configuration, the catwalk effectively absorbs the vertical vibration of the roof structure as the weight part of the TMD, and the damping material also damps the vertical vibration of the roof structure, allowing the vertical vibration of the roof structure to be suppressed more quickly.

[0015] The present invention Seventh The catwalk is supported on the roof structure so as to be movable up and down via a support member that protrudes from the roof structure toward the catwalk so as to be swingable up and down, The TMD is configured in such a way that the catwalk serves as the weight portion by supporting a position on the support member that is closer to the swing fulcrum than the support position of the catwalk.

[0016] According to this configuration, when the roof structure vibrates vertically, the catwalk acts as the weight part of the TMD and moves up and down along with the up and down swing of the support member in response to this vertical vibration, thereby absorbing the vertical vibration of the roof structure, thereby effectively suppressing the vertical vibration of the roof structure. Furthermore, since the TMD supports a position on the swing fulcrum side that has a smaller amount of vertical movement than the support position of the catwalk on the support member, the vertical size of the TMD can be made smaller than when supporting the support position of the catwalk, which has a larger amount of vertical movement on the support member. As a result, the TMD, which uses the catwalk attached to 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. [Brief explanation of the drawings]

[0017] [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] FIG. 1 is a perspective view of a main part showing the configuration of the TMD and roof frame in the first embodiment. [Figure 3] Cross-sectional view of Figure 1 taken along the line III-III [Figure 4]A vertical cross-sectional view of the main parts showing the configuration of the TMD and roof frame in the second embodiment. [Figure 5] A vertical cross-sectional view of the main parts showing the configuration of the TMD and roof frame in the third embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0018] [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.

[0019] As shown in Figures 1 to 3, 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.

[0020] 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.

[0021] As shown in Figures 1 to 3, 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.

[0022] As shown in Figures 1 to 3, the roof structure 3 includes a plurality of girders 32 (see Figures 2 and 3) 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 each girder 32 is not limited to H-shaped steel, but for example, channel steel can be used. Each connecting member 33 is not limited to circular steel pipes, but for example, square steel pipes or H-shaped steel can be used.

[0023] As shown in Figures 1 to 3, 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. As shown in Figures 2 and 3, the catwalk 5 is configured as a sub-beam type that is spanned between adjacent truss beams (girders) 31. More specifically, the catwalk 5 is provided with a plurality of main frames 51 that are spanned between the lower chord members 31B of adjacent truss beams 31, a plurality of horizontal braces 52 that are arranged on the floor surface of the catwalk 5, and expanded metal (not shown) that forms the floor surface of the catwalk 5. Each main frame 51 is formed in a ladder shape from a pair of main members 51A whose both ends are pin-joined to the lower chord members 31B of the truss beams 31, and a plurality of connecting members 51B that connect the pair of main members 51A.

[0024] 1 to 3, the TMD 1 is configured in such a manner that the catwalk 5 supported by the roof frame 3 serves as the weight 11. As described above, the catwalk 5 is provided as the weight 11 of the TMD 1 in a state that makes it easy to vibrate in the vertical direction relative to the roof frame 3, by pin-joining both ends of a pair of main members 51A in the ladder-shaped main frame 51 to the lower chord members 31B of the truss beam 31.

[0025] The TMD1 is configured so that the natural frequency of the catwalk 5 is synchronized with the natural frequency of the roof frame 3 by adjusting at least one of the mass and rigidity of the catwalk 5. In the TMD1 exemplified in this first embodiment, the type and size of the steel material used for the catwalk 5 is selected according to the pre-assumed natural frequency of the roof frame 3, and both the mass and rigidity of the catwalk 5 are adjusted, so that the natural frequency of the catwalk 5 is synchronized with the natural frequency of the roof frame 3. However, this configuration is not limiting, and the catwalk 5 may be configured so that its natural frequency is in tune with the natural frequency of the roof structure 3 by adjusting either the mass or rigidity of the catwalk 5. As for the steel materials used for the catwalk 5, for example, H-shaped steel or channel steel can be used for the main members 51A and connecting members 51B of the main frame 51, and for example, round steel bars or L-shaped steel can be used for the horizontal braces 43. The floor surface of the catwalk 5 is not limited to expanded metal, and for example, perforated steel plates can be used.

[0026] 2 and 3, each main frame 51 of the catwalk 5 is provided with a mass adjustment means 53 for adjusting the mass of the catwalk 5. The mass adjustment means 53 is provided in the center of the extension direction of each main member 51A of each main frame 51, and enables highly accurate mass adjustment of the catwalk 5 by attaching and detaching an adjustment mass.

[0027] 2 and 3, four oil dampers 6 are provided as damping materials between each truss beam 31 of the roof structure 3 and each ladder-shaped main frame 51 of the catwalk 5. The four oil dampers 6 are installed in a V-shape, via a pair of round steel bars 7, spanning between each upper chord 31A of the truss beam 31 and the center of each main member 51A of the main frame 51 in the extension direction. The damping material is not limited to the oil damper 6, but may be, for example, a viscous damper.

[0028] With the above configuration, when the roof structure 3 vibrates vertically, the catwalk 5, which has a relatively large mass and is continuously attached to the roof structure 3 to enable adjustment and inspection of lighting equipment, sound equipment, etc. installed on the roof structure 3, vibrates vertically in sync with the vertical vibration of the roof structure 3 as the weight part 11 of the TMD 1, thereby absorbing the vertical vibration of the roof structure 3, thereby effectively suppressing the vertical vibration of the roof structure 3.

[0029] In other words, by using the catwalk 5, which has a relatively large mass and is continuously provided on the roof structure 3, as the weight portion 11 of the TMD 1, vertical vibration of the roof structure 3 can be effectively suppressed with a rational configuration that does not require a dedicated weight portion.

[0030] Furthermore, since the main frame 51 of the catwalk 5 is provided with mass adjustment means 53 for adjusting the mass of the catwalk 5, as described above, even if it is not possible to precisely tune the natural frequency of the catwalk 5 to the natural frequency of the roof frame 3 by simply selecting the type and size of steel material used for the catwalk 5 and adjusting both the mass and rigidity of the catwalk 5 according to the pre-assumed natural frequency of the roof frame 3, by adjusting the mass of the catwalk 5 using the mass adjustment means 53, it is possible to easily and precisely tune the natural frequency of the catwalk 5 to the natural frequency of the roof frame 3. As a result, the vertical vibration of the roof frame 3 can be easily and effectively suppressed.

[0031] Furthermore, by providing four oil dampers 6 as damping materials between the roof structure 3 and the main frame 51 of the catwalk 5, the catwalk 5 not only effectively absorbs the vertical vibration of the roof structure 3 as the weight part 11 of the TMD 1, but also each oil damper 6 damps the vertical vibration of the roof structure 3, so that the vertical vibration of the roof structure 3 can be suppressed more quickly.

[0032] 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. Note that the vibration control system illustrated in this second embodiment differs from the vibration control system illustrated in the first embodiment above in terms of the catwalk support structure and TMD configuration in the roof structure, and therefore only the catwalk support structure and TMD configuration will be described below.

[0033] As shown in Figure 4, the catwalk 5 is provided on the roof structure 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.

[0034] The catwalk 5 is configured in a lever-like manner so as to be supported on the roof frame 3 so as to be able to swing up and down via a plurality of support members 8 that protrude from the roof frame 3 toward the catwalk 5 so as to be able to swing up and down. Each support member 8 is connected to a support column 34 that spans the lower chord 31B of the roof frame 3 and the girder 32 so as to be able to swing up and down via a fulcrum pin 35 that is provided parallel to the girder 32. The free end of each support member 8 is connected to the upper end of each vertical member 55 that extends upward from a pair of main members 51A of the catwalk 5. In this way, 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 structure at the catwalk arrangement section of each truss beam 31 where the catwalk 5 supported on the free end side of each support member 8 is arranged is larger than when the protruding direction is the same as the extension direction of the roof frame 3, thereby ensuring a larger space for arranging the catwalk 5 on the roof frame 3.

[0035] TMD1 is configured in such a way that the catwalk 5 serves as a weight 11 by supporting a position on the support member 8 that protrudes up and down from the roof frame 3 and is closer to the swing fulcrum than the support position of the catwalk 5. TMD1 is provided with an elastic support mechanism 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.

[0036] The elastic support mechanism 12 includes an upper support member 15 installed on a pair of upper chords 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 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.

[0037] The elastic support mechanism 12 is provided with an upper elastic body 13 provided between the upper support member 15 and the intermediate support member 16 of the elastic support section 12 in a pre-compressed state so as to be compressed and elastically deformed when the catwalk 5 rises, and a lower elastic body 14 provided between the intermediate support member 16 and the lower support member 17 of the elastic support section 12 in a pre-compressed state so as to be compressed and elastically deformed when the catwalk 5 falls. 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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 mechanism 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 mechanism 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.

[0042] 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.

[0043] 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.

[0044] 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 mechanism 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.

[0045] 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 mechanism 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.

[0046] Furthermore, since the elastic support mechanism 12 supports the fulcrum side of the support member 8, even if the load acting on the upper and lower elastic bodies 13, 14 provided in the elastic support mechanism 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 fulcrum side of the support member 8 can be supported suitably.

[0047] Furthermore, since each support member 8 that supports the catwalk 5 and each elastic support mechanism 12 that supports the support members 8 are provided in the inverted triangular internal space formed by a pair of upper chord members 31A on the left and right and a single lower chord member 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 support member 8, each elastic support mechanism 12, etc. are exposed to the outside of each truss beam 31.

[0048] 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.

[0049] In addition, in this second embodiment, an example is given in which the upper ends of each upper coil spring 13A provided in the elastic support mechanism 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 are supported by upper spring support portions provided at the top of this support truss, and the lower ends of each lower coil spring 14A are supported by lower spring support portions provided at the bottom of the support truss.

[0050] Third Embodiment Hereinafter, as one example of a mode for carrying out the present invention, a third embodiment of a vibration damping system according to the present invention will be described with reference to the drawings. The vibration control system illustrated in this third embodiment differs from the vibration control system illustrated in the second embodiment above in the configuration of the elastic support mechanism, and therefore only the configuration of the elastic support mechanism will be described below.

[0051] As shown in FIG. 5, the TMD 1 is provided with an elastic support mechanism 22 that supports a position on the support member 8 closer to the swing fulcrum than the support position of the catwalk 5.

[0052] The elastic support mechanism 22 is provided with an elastic body 23 that elastically deforms in response to a 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] In other words, in the vibration control system illustrated in the third embodiment, the same effects as those of the vibration control system illustrated in the second embodiment can be obtained, and since the single elastic body 23 provided in the elastic support mechanism 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 mechanism 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.

[0059] [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.

[0060] (1) In the first embodiment described above, the catwalk 5 used for the weight portion 11 of the TMD 1 is exemplified as a small beam type structure that is spanned between adjacent truss beams (girders) 31, and in the second and third embodiments described above, a lever type structure that is supported on the roof frame 3 via support members 8 so that it can move up and down freely is exemplified. However, the present invention is not limited to these, and may also be exemplified as a hanging type structure that is suspended from each truss beam (girder) 31.

[0061] (2) 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, but this is not limited to this, and for example, it may be one in which two rows of catwalks 5 provided on the roof structure 3 are configured as the weight portion 11 of the TMD1. [Explanation of symbols]

[0062] 1. TMD 3 Roof frame 5. Catwalk 6. Damping material 8 Support member 11 Weight 51 Main Frame 53 Mass adjustment means

Claims

1. A vibration control system that includes a TMD in a roof structure to suppress vertical vibration of the roof structure, The TMD is configured in a form in which a catwalk supported by the roof frame serves as a weight portion, The roof frame has a plurality of truss beams provided as main beams, which extend in a cantilevered manner from the outer edge of the roof frame and are arranged at predetermined intervals in a direction along the outer edge of the roof frame, The catwalk is a vibration control system that is supported on the extended end side of the truss beams in a long form that extends continuously across multiple truss beams in the arrangement direction of the truss beams.

2. The vibration control system of claim 1, wherein the TMD is configured to tune the natural frequency of the catwalk to the natural frequency of the roof structure by adjusting at least one of the mass and stiffness of the catwalk.

3. 3. The vibration control system according to claim 1, wherein a main frame of the catwalk is provided with mass adjustment means for adjusting the mass of the catwalk.

4. A vibration control system according to any one of claims 1 to 3, wherein a damping material is provided between the roof structure and the main frame of the catwalk to damp vertical vibrations of the roof structure.

5. A vibration control system as described in Claim 4, wherein the damping material is spanned between the roof structure and the main frame in an inclined position in the extension direction of the catwalk.

6. A vibration control system as described in Claim 4, wherein the damping material is installed in a V-shape between adjacent truss beams, spanning the upper chords of the truss beams and the main frame of the catwalk.

7. The catwalk is supported on the roof frame so as to be vertically movable via a support member that protrudes from the roof frame toward the catwalk so as to be vertically swingable, A vibration control system described in any one of claims 1 to 6, wherein the TMD is configured in a form in which the catwalk serves as the weight by supporting a position on the support member that is closer to the swing fulcrum than the support position of the catwalk.

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