JP7228390B2 - Anti-vibration structure - Google Patents

Description

The present invention relates to an anti-vibration structure.

In facilities such as live music halls and dance studios, vertical vibrations (so-called vertical vibrations) caused by bending and stretching movements of a large number of guests in tune with the music cause vibration disturbances in the surrounding buildings. As a countermeasure against this problem, a vibration isolation structure is adopted in which the floor of the relevant portion is a floating floor (usually a thick RC slab) that is insulated from the structure (see, for example, Patent Document 1).
In such a vibration isolation structure, the structure is partially recessed and a floating floor supported by a spring member is provided therein to reduce the reaction force acting on the structure from the vibrated floating floor.
In addition, when adopting an anti-vibration structure in a normal music hall (for example, a live venue with an audience of 2000 or less), a thick RC mat slab with a thickness of about 1 m is used for the floating floor, and the floating floor is rigid. designed to behave (vibrate)

JP 2008-082541 A

In a large-scale music hall with a larger number of spectators, for example, 10,000 or more spectators, the area of the floating floor is also huge. In such a case, it is difficult to make the entire floating floor behave rigidly. There is a possibility that the reaction force acting on the structure from the floating floor that has been installed may not be reduced efficiently.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a vibration isolation structure that can be used even in large-scale facilities.

In order to achieve the above object, a vibration isolation structure according to the present invention includes a structure, a spring member provided in the structure, and a vibrating body supported by the structure via the spring member. In the vibrating structure, the vibrating body is composed of a plurality of vibrating body blocks arranged in a direction perpendicular to the spring axis direction of the spring member, and the plurality of vibrating body blocks are arranged via the spring member. adjacent to each other in the direction orthogonal to the spring axis are connected by pin joints , and a rotational inertia mass damper is arranged between the structure and the vibrating body in parallel with the spring member. characterized by being provided in

In the present invention, a vibrating body (for example, floating floor) is composed of a plurality of vibrating body blocks each supported by a structure via a spring member. As a result, even if the vibrating body is partially vibrated or the vibration applied to the vibrating body is partially different, each vibrating body block will vibrate in accordance with the vibration conditions. In the present invention, the reaction force acting on the structure due to the vibration of each vibrating block can be reduced by the spring member interposed between the vibrating block and the structure.
In addition, since adjacent vibrating body blocks are connected by pin joints, even if they rotate relative to each other, there is a possibility that they may be displaced from each other in a horizontal plane or cause a large difference in level. Displacement can be prevented. As a result, a plurality of vibrating body blocks forming the vibrating body can be used integrally.
In this way, since the vibrating body can be configured by connecting a plurality of vibrating body blocks, there is no practical problem even in a large-scale facility where a huge vibrating body that is difficult to form as one block is installed. A vibration isolation structure for vibrating bodies such as integral floating floors can be constructed.
Further, in the vibration isolation structure according to the present invention, a rotary inertia mass damper is provided in parallel with the spring member between the structure and the vibrating body.
With such a configuration, the inertial mass effect can be used to significantly reduce the reaction force from the vibrating body to the structure in a specific frequency range.

Further, in the vibration isolation structure according to the present invention, the vibrating body is arranged above the structure via the spring member, and the plurality of vibrating body blocks are horizontally arranged and horizontally adjacent to each other. The vibrating block has respective side surfaces facing each other in the horizontal direction, the opposing side surfaces are formed such that the distance between them gradually increases from the top to the bottom, and the upper ends of the opposing side surfaces are spaced apart from each other. They may be connected by pin joints.
With such a configuration, when the adjacent vibrating blocks are relatively displaced so as to rotate with each other, it is possible to prevent the lower sides of the adjacent vibrating blocks from coming into contact with each other.

Further, in the vibration isolation structure according to the present invention, the pin joint portion connecting the vibrating body blocks adjacent in the direction perpendicular to the spring axis is a spherical surface provided on one of the vibrating body blocks adjacent in the direction perpendicular to the spring axis. It may have a slide bearing and a rod that engages with the other of the vibrating body blocks that are adjacent in the direction perpendicular to the spring axis and that is rotatably supported by the spherical slide bearing.
With such a configuration, it is possible to realize a pin joint portion with a high yield strength at a low cost. For example, pin joints with spherical plain bearings and rods can be made more compact and cheaper than pin joints using hinges of the same capacity.
Moreover, by using a spherical plain bearing and a rod for the pin joint, it is possible to easily handle a larger load than a pin joint using a general hinge mechanism.

Further, the vibration isolation structure according to the present invention may have a displacement restraint mechanism that restrains relative displacement between the structure and the vibrating body in the direction orthogonal to the spring axis.
With such a configuration, it is possible to prevent the vibrator from being displaced with respect to the structure in a direction different from the spring axis direction.

According to the present invention, it can be adopted even in large-scale facilities.

BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows an example of the anti-vibration structure by 1st Embodiment of this invention. FIG. 2 is a cross-sectional view taken along the line AA of FIG. 1; (a) is a cross-sectional view along the line BB in FIG. 1, (b) is a view corresponding to the cross-section along the CC line in (a), and (c) is a view corresponding to the cross-section along the DD line in (a). be. It is a figure explaining the behavior of a floating floor. FIG. 5 is a plan view showing an example of a vibration isolation structure according to a second embodiment of the present invention; FIG. 6 is a cross-sectional view taken along line EE of FIG. 5; It is a figure explaining the modification of the anti-vibration structure by embodiment of this invention.

(First embodiment)
A vibration isolation structure according to a first embodiment of the present invention will be described below with reference to FIGS. 1 to 4. FIG.
As shown in FIGS. 1 and 2, the vibration isolation structure 1A according to the first embodiment includes a structure 2 having a recess 21 opening upward, and a floating floor installed inside the recess 21 of the structure 2. 3 (oscillating body), a spring member 4 interposed between the floating floor 3 and the structure 2, a rotational inertia mass damper 5, and an oil damper 6.
The spring member 4 is arranged such that the spring axis direction is the vertical direction and the spring axis orthogonal direction perpendicular to the spring axis is the horizontal direction.
The anti-vibration structure 1A according to the present embodiment is employed, for example, in a building such as a large-scale music hall. (So-called vertical vibration) is assumed to occur.

The structure 2 is constructed of, for example, RC, and has a base portion 22 of a floor plate that supports the spring member 4 and a side wall portion 23 that extends upward from the entire peripheral portion of the base portion 22 .
In this embodiment, the base portion 22 is formed to have a rectangular planar shape. The concave portion 21 is formed in the upper portion of the base portion 22, the upper surface 22a (see FIG. 2) of the base portion 22 is the bottom surface, and the inner surface 23a of the surrounding side wall portion 23 is the side surface. The concave portion 21 is formed to have a rectangular planar shape.
The horizontal directions in which the sides of the rectangles of the base portion 22 and the concave portion 21 extend in plan view are defined as the X direction and the Y direction.

The floating floor 3 is configured to be vertically displaceable with respect to the structure 2 .
The floating floor 3 has a plurality of floating floor blocks 31 (vibrating blocks) arranged in the X direction and the Y direction, and pin joints 32 that connect adjacent floating floor blocks 31 in the X direction and the Y direction. are doing.
Each of the plurality of floating floor blocks 31 is made of concrete or the like, is constructed in a plate shape having a rectangular plate surface, and is arranged in a posture in which the thickness direction is the vertical direction and the plate surface is the horizontal plane. The plurality of floating floor blocks 31 are constructed in substantially the same shape.
In this embodiment, each of the plurality of floating floor blocks 31 is set to have a dimension in the X direction and a dimension in the Y direction of 8000 mm, and a dimension in the vertical direction (thickness direction) of 1000 mm. In this embodiment, the weight including finishing of one floating floor block 31 is designed to be 160 tons.

In this embodiment, six floating floor blocks 31 are arranged three each in the X direction and two each in the Y direction.
Each of the six floating floor blocks 31 is installed above the bottom surface of the recess 21 (above the base portion 22) via the spring member 4, the rotary inertia mass damper 5, and the oil damper 6. As shown in FIG.
A gap 23 b is formed between the six floating floor blocks 31 and the inner surface 23 a of the side wall portion 23 . Each of the six floating floor blocks 31 is configured to be vertically displaceable with respect to the structure 2 .

The pin joints 32 are provided between the floating floor blocks 31 adjacent in the X direction and between the floating floor blocks 31 adjacent in the Y direction.
As shown in FIG. 3 , the pin joint portion 32 includes a spherical plain bearing 33 in which an inner ring 332 is rotatably provided inside an outer ring 331 , a rod 34 inserted through the inner ring 332 , and an outer ring 331 of the spherical plain bearing 33 . is attached and fixed to one floating floor block 31 of the floating floor blocks 31 adjacent in the X direction or Y direction, and a housing 35 (bearing housing case) is attached and is adjacent in the X direction or Y direction and a rod fixing jig 36 fixed to the other floating floor block 31 of the floating floor blocks 31 .

The outer ring 331 of the spherical plain bearing 33 is formed in a cylindrical shape with a spherical inner peripheral surface. The inner ring 332 of the spherical plain bearing 33 is formed in a cylindrical shape with a spherical outer peripheral surface.
The inner ring 332 is configured to be rotatable along the inner peripheral surface of the outer ring 331 . The inner ring 332 is provided inside the outer ring 331 so as not to slip out of the outer ring 331 .

The rod 34 is a round bar-shaped member, and has one end in the length direction fitted to the inner ring 332 and the other end protruding from the inner ring 332 . The rod 34 is rotatable along the inner peripheral surface of the outer ring 331 together with the inner ring 332 .
The rod 34 is made of SUJ2 (high carbon chromium bearing steel), for example.

The housing 35 is formed with a hole 35a into which the outer ring 331 is fitted. The outer ring 331 is fixed to the housing 35 so as not to be displaced. The outer ring 331 is fixed to one of the floating floor blocks 31 via the housing 35 so that the axial direction of the outer ring 331 is the direction in which the adjacent floating floor blocks 31 face each other.
The housing 35 is fixed to the floating floor block 31 with anchor bolts or the like.

The rod fixing jig 36 is formed with a hole portion 36a through which the other side of the rod 34 in the length direction is coaxially inserted. The rod 34 inserted through the hole 36a is configured to be rotatable around the axis inside the hole 36a and displaceable in the axial direction.
Grease is applied to the inner peripheral surface of the hole 36a of the rod fixing jig 36, so that the rod 34 inserted through the hole 36a is easily rotated or displaced inside the hole 36a.
The rod fixing jig 36 is fixed to the floating floor block 31 with anchor bolts or the like.

The rod fixing jig 36 is made of, for example, S45C (carbon steel for mechanical structure).
The rod fixing jig 36 is fixed to the floating floor block 31 with anchor bolts or the like.
In this embodiment, the rod fixing jig 36 consists of two plate members 361 made of steel having semi-circular grooves 361a having substantially the same diameter as the radius of the rod 34. The two plate members 361 are stacked so that the semi-circular grooves 361a face each other. It is manufactured by The two overlapping semi-circular grooves 361a form a hole 36a through which the rod 34 is inserted.

The rod fixing jig 36 is fixed to the other floating floor block 31 so that the hole 36 a thereof opens toward the other floating floor block 31 .
The rod fixing jig 36 is made of, for example, S45C (carbon steel for mechanical structure).
In this embodiment, the proof stress per pin joint portion 32 is 90 kN, and the long-term allowable load is 40 kN.

The pin joints 32 are attached so that the spherical plain bearings 33 and the rods 34 are arranged near the upper ends of the adjacent floating floor blocks 31 . Thereby, the pin joint portions 32 join the upper end portions of the floating floor blocks 31 adjacent to each other in the X direction or the Y direction. The floating floor blocks 31 adjacent in the X direction or the Y direction are not joined together at their lower ends.

In this embodiment, the interval 31a between the floating floor blocks 31 adjacent in the X direction and the Y direction is set to have the same dimension throughout the vertical direction, for example, about 10 mm, in a normal state when the floating floor 3 is not vibrated. there is This gap may be left open, or may be closed with a sealing material, a fire-resistant belt, or the like. Note that even when a sealing material, a fireproof belt, or the like is provided between the adjacent floating floor blocks 31, the adjacent floating floor blocks 31 are configured to be relatively displaceable.

As shown in FIGS. 1 and 2, the spring member 4 is arranged such that the spring axis direction is the vertical direction, the lower end portion is fixed to the base portion 22 of the structure 2, and the upper end portion is fixed to the base portion 22 of the structure 2. are fixed to the floating floor block 31 . Four spring members 4 are provided for one floating floor block 31 . In this embodiment, the maximum force of the spring member 4 is set to 600 kN, and the spring value is set to 1.7 kN/mm.

One rotary inertia mass damper 5 is provided for one floating floor block 31 . In this embodiment, the rotary inertial mass damper 5 has an inertial mass of 27 tons and a stroke of ±55 mm.
In this embodiment, the weight of one floating floor block 31 is set to 160 tons, and the support spring rigidity is set to 6.8 kN/mm. As a result, the natural frequency of the floating floor block 31 is about 1.0 Hz, and the frequency to be controlled (the frequency that greatly reduces the reaction force) described in Patent Document 1 is 2.5 Hz.
One oil damper 6 is provided for one floating floor block 31 . In this embodiment, the oil damper 6 has a damping coefficient C of 1000 kN/(m/s) and a stroke of ±60 mm.

As shown in FIG. 4, in the vibration isolation structure 1A according to this embodiment, when the floating floor 3 is vibrated in the vertical direction, each of the plurality of floating floor blocks 31 vibrates vertically. Since the adjacent floating floor blocks 31 are connected by the pin joints 32 , the vibration may be transmitted from the pin joints 32 to the other floating floor block 31 . When each floating floor block 31 is vibrated, the total reaction force acting on the structure 2 from the spring member 4, the rotational inertia mass damper 5 and the oil damper 6 is large in the range of 2 to 4 Hz where vertical vibration is a problem. is reduced to
In this embodiment, adjacent floating floor blocks 31 are connected by pin joints 32 near their upper ends. For this reason, the upper surfaces 31b of the adjacent floating floor blocks 31 are displaced so as to rotate relative to each other via the pin joint portions 32 without being displaced relative to each other in the vertical direction.

Next, the operation and effects of the anti-vibration structure 1A according to the first embodiment described above will be described with reference to the drawings.
In the anti-vibration structure 1A according to the first embodiment described above, the floating floor 3 is composed of a plurality of floating floor blocks 31 each supported by the structure 2 via the spring members 4 . As a result, even if the floating floor 3 is partially vibrated or the vibration applied to the floating floor 3 is partially different, each floating floor block 31 vibrates in accordance with the vibration conditions. . In the anti-vibration structure 1A of the present embodiment, each floating floor block 31 vibrates, causing the spring member 4, the rotational inertia mass damper 5, and the oil damper interposed between the floating floor block 31 and the structure 2 to move. The reaction force acting on the structure 2 from 6 can be greatly reduced.
In addition, since the adjacent floating floor blocks 31 are connected by the pin joints 32, even if they rotate relatively, they are separated from each other in the horizontal plane, and the relative movement of the blocks causes a large difference in level. Displacement can be prevented. Thereby, the plurality of floating floor blocks 31 constituting the floating floor 3 can be used integrally.
In this way, since the floating floor 3 can be configured by connecting a plurality of floating floor blocks 31, it is practically possible even in a large-scale facility having a huge floating floor 3 that is difficult to form into one block. The vibration isolation structure 1A of the integrated floating floor 3 can be constructed without problems.

Further, the pin joints 32 connecting adjacent floating floor blocks 31 are engaged with a spherical slide bearing 33 provided on one of the adjacent floating floor blocks 31 and the other of the adjacent floating floor blocks 31, thereby and a rod 34 rotatably supported by the bearing 33 . As a result, the pin joint portion 32 with high yield strength can be realized compactly and inexpensively. For example, the pin joint 32 having the spherical plain bearing 33 and the rod 34 of this embodiment can be manufactured more compactly and inexpensively than a pin joint using a hinge mechanism with the same strength.
Further, although there is no general hinge mechanism that can handle a load of 10 kN, a load of 40 kN can be easily handled by using the spherical plain bearing 33 and rod 34 of this embodiment.

A rotational inertia mass damper 5 is provided in parallel with the spring member 4 between the structure 2 and the floating floor 3 .
With such a configuration, the inertial mass effect can be used to significantly reduce the reaction force from the floating floor 3 to the structure 2 in a specific frequency range. For example, it is possible to greatly reduce the reaction force (1/10 or less of the excitation force) in the excitation frequency range of 2 to 4 Hz, where the vertical vibration due to the bending and stretching motion on the upper part of the floating floor 3 becomes a problem.

(Second embodiment)
Next, a second embodiment will be described with reference to the accompanying drawings. Members and portions that are the same as or similar to those of the above-described first embodiment are denoted by the same reference numerals, and description thereof will be omitted. Different configurations are described.
As shown in FIGS. 5 and 6, the vibration isolation structure 1B according to the second embodiment includes a horizontal displacement restraining mechanism 7 (displacement restraining mechanism) that restrains horizontal displacement of the floating floor block 31 adjacent to the structure 2 in the horizontal direction. mechanism).

Vertical vibration is caused by bending and stretching motions of a large number of passengers, and it may be accompanied by not only vertical but also horizontal excitation force. In this case, the horizontal excitation force acts on the floating floor. However, since the floating floor 3 of the first embodiment does not have a horizontal resistance element, there is a possibility that the floating floor 3 may undergo a large horizontal displacement due to the excitation force. Therefore, in the second embodiment, a horizontal displacement restraint mechanism 7 is added to restrain this horizontal displacement.

The horizontal displacement restraint mechanism 7 includes a rising portion 71 extending upward from the base portion 22 of the structure 2, a falling portion 72 extending downward from the floating floor block 31, and the rising portion 71 and the falling portion 72 arranged in a horizontal direction. and a connecting portion 73 that is connected so as to constrain relative displacement and allow relative displacement in the vertical direction.

The rising portion 71 is arranged inside the concave portion 21 of the structure 2 and extends upward from the base portion 22 . The rising portion 71 is provided integrally with the base portion 22 .
The rising portion 71 is located below the Y-direction central portion of both X-direction edge portions of each of the plurality of floating floor blocks 31 arranged inside the recess 21 and the X-direction central portion of both Y-direction edge portions thereof. is placed below the Four rising portions 71 are provided on the lower side of one floating floor block 31 . Of the lower raised portions 71 of the adjacent floating floor blocks 31, the raised portions 71 adjacent in the X direction or the Y direction are provided integrally.

The falling portion 72 extends downward from the central portion of the floating floor block 31 in plan view. The falling portion 72 is provided integrally with the floating floor block 31 .
One falling portion 72 is provided for one floating floor block 31 .
The rising portion 71 and the falling portion 72 are spaced apart in the X direction and the Y direction.

An upper end portion 71a of the rising portion 71 is spaced from the lower surface 31c of the floating floor block 31, and a lower end portion 72a of the falling portion 72 is spaced from the upper surface 22a of the base portion 22.
In this embodiment, the dimension between the lower surface 31c of the floating floor block 31 and the upper surface 22a of the base portion 22 is 1800 mm, the vertical dimension of each of the rising portion 71 and the falling portion 72 is 1700 mm, and the upper end portion of the rising portion 71 The distance between 71a and the lower surface 31c of the floating floor block 31 and the distance between the lower end portion 72a of the falling portion 72 and the upper surface 22a of the base portion 22 are set to 100 mm, respectively.
The plan view shapes of the rising portion 71 and the falling portion 72 are each set to a square of 800 mm×800 mm.

The connecting portion 73 includes a rod-shaped rod member 731 , a first bonding member 732 that connects one end of the rod member 731 to the falling portion 72 , and the other end of the rod member 731 to the falling portion 72 . and a second joint member 733 that
The rod member 731 is a steel rod or the like, and in this embodiment, a steel pipe of P-267.4×9.3t (SS400) is used, and the maximum axial load N is set to 1500 kN.
The first joint member 732 and the second joint member 733 connect the rod member 731 and the rising portion 71 or the falling portion 72 by pin joints using clevises, ball joints, or the like.

Two bar members 731 are arranged on both sides in the X direction and on both sides (four sides) in the Y direction with respect to one trailing portion 72 with a space therebetween in the vertical direction. By arranging the rod members 731 in two stages, it is possible to prevent rotational (rocking) displacement of the floating floor due to horizontal force during an earthquake.
The rod members 731 arranged on both sides of the falling portion 72 in the X direction are in a posture extending in the X direction, and one end of the rod member 731 is attached to the falling portion 72 via a first joint member 732 and extends in the Y direction. , and the other end is joined to the rising portion 71 via a second joint member 733 so as to be rotatable about an axis extending in the Y direction. As a result, the rod members 731 arranged on both sides of the falling portion 72 in the X direction can be displaced so that both ends move relative to each other in the vertical direction, but both ends do not move relative to each other in the horizontal direction. is constrained.

The rod members 731 arranged on both sides of the rising portion 71 in the Y direction are in a posture extending in the Y direction, and one end of the rod member 731 is attached to the falling portion 72 via the first joint member 732 around the axis extending in the X direction. It is rotatably joined, and the other end is joined to the rising portion 71 via a second joint member 733 so as to be rotatable about an axis extending in the X direction. As a result, the rod members 731 arranged on both sides of the trailing portion 72 in the Y direction can be displaced so that both ends move relative to each other in the vertical direction, but both ends do not move relative to each other in the horizontal direction. is constrained.
In the present embodiment, the connecting portion 73 is formed between the falling portion 72 and the rising portion 71 after the floating floor block 31 is supported by the structure 2 via the spring member 4 , the rotational inertia mass damper 5 and the oil damper 6 . placed in between.

Since the falling portion 72 and the rising portion 71 are connected to the connecting portion 73, relative displacement is possible only in the vertical direction, and relative displacement in the horizontal direction is restrained.
The rising portion 71 , the falling portion 72 and the connecting portion 73 are arranged at positions that do not interfere with the spring member 4 , the rotational inertia mass damper 5 and the oil damper 6 .

In the anti-vibration structure 1B according to the second embodiment, when the floating floor 3 is vibrated in the vertical direction, all the floating floor blocks 31 vibrate, respectively, as in the first embodiment.
At this time, as described above, the falling portion 72 and the rising portion 71 can be relatively displaced only in the vertical direction, and the relative displacement in the horizontal direction is restricted. Relative displacement in direction is constrained.

The anti-vibration structure 1B according to the second embodiment described above has the same effect as the first embodiment, and has the horizontal displacement restraint mechanism 7 that restrains the relative displacement in the horizontal direction between the structure 2 and the floating floor 3. This prevents the floating floor 3 from being horizontally displaced with respect to the structure 2 .

Further, in the second embodiment, a steel rod member 731 having both ends connected to the rising portion 71 and the falling portion 72 by pin joints is installed in the horizontal displacement restraint mechanism 7 . As a result, the horizontal displacement restraining mechanism 7 can be realized at a low cost, although the number of locations increases compared to the case of providing a horizontal displacement restraining mechanism using linear guides or laminated rubber.

In addition, since the floating floor 3 is made of concrete, drying shrinkage of about 500 μ occurs. Become. For example, if the floating floor block 3 has a side length of 80 m, it will be shrunk by 40 mm, making horizontal restraint difficult. Furthermore, as in this embodiment, if the side length is 1 m at the center of the plane of the floating floor block 31 where the falling portion 72 is provided, the amount of shrinkage is 0.5 mm, so the amount of shrinkage is almost ignored and the horizontal restraint member is used. can be designed.

Although the embodiments of the anti-vibration structure according to the present invention have been described above, the present invention is not limited to the above embodiments, and can be modified as appropriate without departing from the scope of the invention.
For example, in the above-described embodiment, the pin joints 32 that connect the horizontally adjacent floating floor blocks 31 have a structure including the spherical plain bearings 33 and the rods 34. may be a part. For example, it may be a pin joint using a hinge.
In the above embodiment, the rotary inertia mass damper 5 and the oil damper 6 are provided between the structure 2 and the floating floor 3 in parallel with the spring member 4. 6 may be omitted.

In the above-described embodiment, the interval 31a between the floating floor blocks 31 adjacent in the X direction and the Y direction is the same dimension throughout the vertical direction when the floating floor 3 is not vibrated normally. is set to be On the other hand, as in the vibration isolation structure 1C shown in FIG. 7, the spacing 31a between the floating floor blocks 31 adjacent in the X direction and the Y direction is connected by pin joints when the floating floor 3 is not vibrated normally. It may be set to gradually widen from the upper side where it is connected toward the lower side where it is not connected.
With such a configuration, when the adjacent floating floor blocks 31 are displaced relative to each other, it is possible to suppress contact between the lower ends of the adjacent floating floor blocks 31 .
In the above-described embodiment, the upper ends of the adjacent floating floor blocks 31 are connected to each other by pin joints, but the vertical intermediate portions or the lower end portions may be connected by pin joints.

1A, 1B, 1C anti-vibration structure 2 structure 3 floating floor (vibrating body)
4 spring member 5 rotary inertia mass damper 7 horizontal displacement restraint mechanism (displacement restraint mechanism)
31 floating floor block (oscillating body block)
32 Pin joint 33 Spherical plain bearing 34 Rod

Claims (4)

a struct;
a spring member provided on the structure;
a vibrating body supported by the structure via the spring member,
The vibrating body is composed of a plurality of vibrating body blocks arranged in a direction orthogonal to the spring axis direction of the spring member,
The plurality of vibrating body blocks are each supported by the structure via the spring members,
the vibrating body blocks adjacent to each other in the direction perpendicular to the spring axis are connected by pin joints ,
A vibration isolation structure , wherein a rotational inertia mass damper is provided in parallel with the spring member between the structure and the vibrating body. The vibrating body is arranged above the structure via the spring member,
The plurality of vibrating body blocks are arranged in a horizontal direction,
The horizontally adjacent vibrating body blocks have side surfaces facing each other in the horizontal direction, and the opposing side surfaces are formed such that the distance between them gradually increases from the top to the bottom,
2. The vibration-damping structure according to claim 1, wherein upper end portions of said opposing side surfaces are connected to each other by pin joints. A pin joint portion that connects the vibrating body blocks adjacent to each other in the direction perpendicular to the spring axis,
a spherical plain bearing provided on one of the vibrating blocks adjacent to each other in the direction orthogonal to the spring axis;
3. The preventive device according to claim 1, further comprising a rod that engages with the other of said vibrating body blocks that are adjacent to each other in the direction perpendicular to said spring axis and that is rotatably supported by said spherical plain bearing. vibration structure. 4. The vibration isolation structure according to any one of claims 1 to 3, further comprising a displacement restraining mechanism that restrains relative displacement between the structure and the vibrating body in the direction perpendicular to the spring axis.

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