JP2018131317A - Seismic isolation and vibration control system of rack warehouse - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seismic isolation and vibration control system of a rack warehouse capable of reducing acceleration due to earthquake all over the rack warehouse in a height direction and capable of reducing acceleration regardless of characteristics of input earthquake wave.SOLUTION: The system comprises a vibration control device 2 provided to an uppermost part of a rack structure body 12 for acting as a TMD, and a seismic isolation device 3 provided between a floor surface (installation surface) 15 of a rack warehouse 13 and the rack structure body 12. The seismic isolation device 3 comprises: a lower guide part which is provided to an upper part of the floor surface 15 and has a lower slide surface protruding downward along an X direction and inclining in a V-shape; an upper guide part which is provided to a bottom part of the rack structure body 12 and has an upper slide surface protruding upward along a Y direction and inclining in a reverse V-shape; and a slider which is arranged between the lower slide surface and the upper slide surface, capable of relatively displacing in the X direction to the lower guide part along the lower slide surface, and capable of relatively displacing in the Y direction to the upper guide part along the upper slide surface.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vibration isolation system for a rack warehouse in which a rack structure in which racks are arranged in multiple stages on an installation surface.

The Great East Japan Earthquake caused a lot of damage in logistics facilities such as rack warehouses. The rack warehouse is equipped with a rack structure with racks connected in multiple stages. However, the damage caused by the collapse or fall of the contents contained in the rack structure is greater than the damage of the rack structure itself. It has been found that there are many.
The contents are placed on the rack in a state of being accommodated in the pallet, and the condition for causing the load collapse or dropping of the contents is whether or not the acceleration of the pallet exceeds about 500 gal. For this reason, when an earthquake occurs, the countermeasure which reduces the acceleration of each pallet which accommodates a thing is proposed (for example, refer patent documents 1 and 2). For example, a TMD (tuned mass damper) or mass damper is provided in the rack structure to provide a vibration control structure for the rack warehouse, or a rolling support, a viscous damper and a horizontal spring are provided between the rack structure and the installation surface. Measures to make the warehouse seismically isolated have been proposed.

JP 2014-141314 A JP, 2006-056007, A

The rack warehouse is an independent structure with a large tower ratio (the ratio of the length in the height direction to the length in the width direction of the structure), and thus has a structure that easily shakes. For this reason, even if the rack structure is a vibration damping structure or a seismic isolation structure as described above, the swing at the top of the rack warehouse is at most 1/3 to 1/1 compared to a rack warehouse that is not a vibration damping structure or a seismic isolation structure. Only about 2 can be reduced.
Even if TMD is installed in the rack warehouse as a damping structure, TMD alone has a damping effect for seismic waves with long-period components, but for seismic waves with short-period components such as pulses, We cannot expect vibration suppression effect very much.
Even if the seismic isolation structure is installed in the rack warehouse, if the seismic isolation layer is provided with a rigid horizontal spring, the period will be shortened and a sufficient seismic isolation effect may not be obtained depending on the characteristics of the seismic wave. Or resonate.

  Accordingly, the present invention provides a vibration isolation system for a rack warehouse that can reduce the acceleration due to an earthquake throughout the height direction of the rack warehouse and can reduce the acceleration regardless of the characteristics of the input seismic wave. For the purpose.

  In order to achieve the above object, a vibration isolation system for a rack warehouse according to the present invention is the rack vibration isolation system for a rack warehouse in which a rack structure in which racks are connected in multiple stages is installed on an installation surface. A vibration damping device provided at the top of the body and functioning as a TMD; and a seismic isolation device provided between the installation surface and the rack structure. A lower guide portion having a lower sliding surface inclined in a V-shape that protrudes downward along one horizontal direction, and a bottom guide portion provided at the bottom of the rack structure; Between the upper guide portion having an upper sliding surface inclined in an inverted V shape that protrudes upward along another horizontal direction orthogonal to the lower sliding surface and the upper sliding surface. The lower guide part and the one horizontal direction along the lower sliding surface Both are possible relative displacement, and having a relative displaceable slider to the other horizontal direction and the upper guide portion along the upper sliding surface.

  In the present invention, a vibration damping device that functions as TMD is provided at the top of the rack structure, and a seismic isolation device is provided between the installation surface and the rack structure. As a result, when an earthquake occurs, the seismic isolation device mainly reduces the acceleration in the region below the structural center of gravity in the rack structure, and the damping device is mainly above the structural center of gravity in the rack structure. The acceleration in the region can be reduced. As a result, in the rack warehouse vibration isolation system of the present invention, the acceleration can be reduced over the entire height of the rack structure.

By using the vibration damping device and the seismic isolation device in combination, even a structure with low rigidity such as a rack warehouse can achieve the same effect as a structure having a predetermined rigidity.
By using the vibration damping device and the seismic isolation device in combination, a large response reduction effect can be obtained even for an earthquake wave that is less effective with the vibration damping device alone.

Since the seismic isolation device can restore the rack structure to the original position using the inclined surface, there is no need to provide a restoring spring, and the structure does not have spring rigidity. As a result, the seismic isolation device is not easily affected by the characteristics of the input seismic wave and does not resonate with the seismic wave. Therefore, the acceleration can be reduced regardless of the characteristics of the input seismic wave, and the seismic isolation effect is exhibited. can do.
Since the seismic isolation device has a configuration that does not have a natural period, the specifications of the vibration control device can be easily determined without considering the natural period of the seismic isolation device.
The seismic isolation device is capable of relative displacement with respect to the horizontal direction of the lower guide part and the horizontal direction perpendicular to the horizontal direction of the upper guide part. As a result, even if there is an unbalanced load or load variation peculiar to the rack warehouse, it is possible to suppress twisting of the rack structure with respect to the installation surface, and to exhibit a stable response reduction effect.

Further, in the vibration isolating system for a rack warehouse according to the present invention, the natural period of the movable mass of the vibration damping device is assumed that the seismic isolation device is not provided and the rack structure is fixed to the installation surface. In this case, it may be synchronized with the primary period of the rack structure.
By setting it as such a structure, the specification of a damping device can be set easily, without being influenced by the characteristic of a seismic isolation device.

  ADVANTAGE OF THE INVENTION According to this invention, while being able to reduce the acceleration by an earthquake over the whole height direction of a rack warehouse, acceleration can be reduced irrespective of the characteristic of an input seismic wave.

It is a figure which shows an example of the vibration isolation system of the rack warehouse by embodiment of this invention. It is a mimetic diagram explaining a damping device of an embodiment of the present invention. (A) The disassembled perspective view of the seismic isolation apparatus of embodiment of this invention, (b) is the perspective view which looked at the slider of (a) from the lower side. (A) is the figure which looked at the seismic isolation apparatus of embodiment of this invention from the Y direction, (b) is the figure which looked at the seismic isolation apparatus of embodiment of this invention from the X direction. (A) is a figure explaining a mode that the needle | mover of the seismic isolation apparatus of embodiment of this invention moved to the X direction with respect to the lower guide part, (b) The needle | mover of the seismic isolation apparatus of embodiment of this invention is It is a figure explaining a mode that it moved to the Y direction with respect to the lower guide part. It is a graph which shows the response acceleration for every seismic wave in the rack warehouse of a damping structure, the rack warehouse of a damping structure, and the rack warehouse of a non-seismic isolation and a non-damping structure. It is a graph which shows the response displacement for every seismic wave in the rack warehouse of a damping structure, the rack warehouse of a damping structure, and the rack warehouse of a non-seismic isolation and a non-damping structure.

Hereinafter, a vibration isolation system for a rack warehouse according to an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the vibration isolation system 1 for a rack warehouse according to the present embodiment is provided in a rack warehouse 13 in which rack structures 12 in which racks 11 such as an automatic rack warehouse are arranged in multiple stages in the vertical direction are installed. It has been. The rack warehouse 13 is provided with an RC mat 14 on which the rack structure 12 is placed. The RC mat 14 is disposed above the floor surface (installation surface) 15 of the rack warehouse 13. A seismic isolation layer 16 is formed between the RC mat 14 and the floor 15 of the rack warehouse 13, and the seismic isolation device 3 of the rack isolation system 1 of the rack warehouse is disposed. In the rack 11, for example, a storage item stored in a pallet is stored.

  A rack warehouse vibration isolation system 1 includes a vibration damping device 2 that functions as a TMD provided at the top of the rack structure 12, and a seismic isolation device 3 provided in the seismic isolation layer 16. . In this embodiment, a plurality of vibration damping devices 2, 2... With the same form are provided on the top of the rack structure 12, and a plurality of seismic isolation devices 3, 3. Yes.

  As shown in FIG. 2, the vibration damping device 2 includes a fixed portion 21 fixed to the rack structure 12, a movable mass 22 supported by the fixed portion 21 and relatively movable in the horizontal direction, and a fixed portion. An attenuator 23 disposed between the movable portion 22 and the movable mass 22 and attenuating the relative vibration of the movable mass 22 with respect to the fixed portion 21 while allowing the relative vibration to be attenuated. And a horizontal spring 24 that urges the movable mass 22 while allowing relative vibration of the movable mass 22 with respect to the fixed portion 21.

The fixed portion 21 is fixed so as not to be displaced with respect to the rack structure 12. The fixed portion 21 has a slider 211 that supports the movable mass 22 so as to be movable in the horizontal direction.
The movable mass 22 is set to 3% or more of the effective mass in this embodiment.
The attenuation unit 23 is configured by an attenuation device using an oil damper, viscoelastic rubber, or the like. In this embodiment, the attenuation constant is set to about 10%.

  In the present embodiment, a seismic isolation layer is provided between the floor surface and the RC mat, and the inclined seismic isolation structure in the case where the seismic isolation device similar to the seismic isolation device 3 of this embodiment is provided in the seismic isolation layer. The natural period of the rack structure, and the natural period of the rack structure of the non-base isolation structure when the base isolation layer is not provided between the floor surface and the RC mat and the base isolation device 3 of this embodiment is not provided. Are the same. For this reason, the specifications of the damping device 2 (specifications of the movable mass 22, the damping part 23, the horizontal spring 24, etc.) are set based on the natural period of the rack structure having the non-seismic isolation structure. . The specifications of the movable mass 22 of the vibration damping device 2 are set so as to be synchronized with the primary period of the rack structure having the above-described non-seismic isolation structure.

  As shown in FIGS. 3 and 4, the seismic isolation device 3 is fixed to the lower guide portion 4 fixed to the floor 15 (see FIG. 4) of the rack warehouse 13 and the bottom of the RC mat 14 (see FIG. 4). And an upper guide portion 5 and a slider 6 disposed between the lower guide portion 4 and the upper guide portion 5. FIG. 4 is a diagram in which the dimensions in the X direction and the Y direction, which will be described later, are smaller than those in FIG. 3.

The lower guide part 4 includes a main body part 42 having a lower sliding surface 41 on which the slider 6 slides, and a fixed part 43 (connected to the lower part of the main body part 42 and fixed to the floor 15 of the rack warehouse 13. 4).
The main body 42 is formed in a block shape that is a long, substantially rectangular parallelepiped, and is arranged in a direction extending in one horizontal direction. One horizontal direction is defined as an X direction, and another horizontal direction orthogonal to the one horizontal direction is defined as a Y direction. The upper surface of the main body 42 is formed in a substantially V-shaped inclined surface in which a substantially central portion in the X direction protrudes downward along the X direction. The upper surface of the main body 42 is a lower sliding surface 41. A bent portion at a substantially central portion of the lower sliding surface 41 is referred to as a lower bent portion 411. Of the lower sliding surface 41, one side in the X direction from the lower bent portion 411 is a first lower sliding surface 412, and the other side in the X direction from the lower bent portion 411 is a second lower sliding surface 413. .

The first lower sliding surface 412 and the second lower sliding surface 413 are each formed on an inclined surface that is a flat surface. The inclination angles of the first lower sliding surface 412 and the second lower sliding surface 413 with respect to the horizontal plane are set to the same value (inclination angle θ).
The first lower sliding surface 412 and the second lower sliding surface 413 are each provided with a sliding material such as Teflon (registered trademark) so as to reduce friction with the slider 6.
End surfaces 421 and 421 on both sides in the Y direction of the main body 42 are formed to be substantially vertical surfaces facing the Y direction.

  The fixing portion 43 is formed in a plate shape, and is joined to the lower surface of the main body portion 42 in a direction in which the plate surface is a horizontal plane. The fixing portion 43 is formed in a substantially rectangular shape that is larger in the X direction and the Y direction than the main body portion 42, and protrudes in the X direction and the Y direction from the main body portion 42. The fixed portion 43 is fixed to the floor surface 15 of the rack warehouse 13.

The upper guide portion 5 includes a main body portion 52 having an upper sliding surface 51 on which the slider 6 slides, and a fixing portion 53 connected to the upper portion of the main body portion 52 and fixed to the RC mat 14 (see FIG. 5). And have.
The main body 52 is formed in a block shape that is a long, substantially rectangular parallelepiped, and is arranged in a direction extending in the Y direction. The lower surface of the main body portion 52 is formed in a substantially inverted V-shaped inclined surface having a substantially central portion in the Y direction protruding upward along the Y direction. The lower surface of the main body 52 is an upper sliding surface 51. A bent portion at a substantially central portion of the upper sliding surface 51 is referred to as an upper bent portion 511. Of the upper sliding surface 51, one side in the Y direction from the upper bent portion 511 is a first upper sliding surface 512, and the other side in the Y direction from the upper bent portion 511 is a second upper sliding surface 513. .

The first upper sliding surface 512 and the second upper sliding surface 513 are respectively formed on inclined surfaces that are flat surfaces. The inclination angles of the first upper sliding surface 512 and the second upper sliding surface 513 with respect to the horizontal plane are set to the same value (inclination angle θ). This inclination angle θ has the same value as the inclination angle θ of the first lower sliding surface 412 and the second lower sliding surface 413 with respect to the horizontal plane.
The first upper sliding surface 512 and the second upper sliding surface 513 are each provided with a sliding material such as Teflon (registered trademark) so as to reduce friction with the slider 6.
The end faces 521 and 521 on both sides in the X direction of the main body 52 are formed so as to be substantially vertical surfaces facing the X direction.

  The fixing portion 53 is formed in a plate shape, and is joined to the upper surface of the main body portion 52 in a direction in which the plate surface is a horizontal plane. The fixing portion 53 is formed in a substantially rectangular shape that is larger in the X direction and the Y direction than the main body portion 52, and protrudes in the X direction and the Y direction from the main body portion 52. The fixing portion 53 is fixed to the lower surface of the RC mat 14.

  The lower guide part 4 and the upper guide part 5 are arranged so as to overlap with each other in the vertical direction, and the slider is placed at the intersection 10 where the lower guide part 4 and the upper guide part 5 overlap in the vertical direction. 6 is arranged.

The slider 6 includes a main body portion 61, a lower guide portion 62 that prevents relative displacement in the Y direction with the lower guide portion 4, and an upper guide portion 63 that prevents relative displacement in the X direction with respect to the upper guide portion 5. ,have.
The main body 61 is formed in a block shape in which the shape in plan view (viewed from above) is a substantially square shape.
A pair of lower guide parts 62 and 62 are mutually arrange | positioned at intervals in the Y direction. The interval between the pair of lower guide portions 62 and 62 is formed to be slightly larger than the dimension in the Y direction of the main body portion 42 of the lower guide portion 4. Inner side surfaces 621 and 621 of the pair of lower guide portions 62 and 62 facing each other in the Y direction are formed as vertical surfaces.
A lower contact surface 64 that contacts the lower sliding surface 41 is formed in the entire region between the pair of lower guide portions 62, 62 on the lower surface of the main body portion 61.

The lower contact surface 64 is formed in a substantially V-shaped inclined surface in which a substantially central portion in the X direction protrudes downward along the X direction. A bent portion at the substantially central portion in the X direction of the lower contact surface 64 is defined as a lower bent portion 641.
Of the lower contact surfaces 64, one side in the X direction from the lower bent portion 641 is a first lower contact surface 642, and the other side in the X direction from the lower bent portion 641 is a second lower contact surface 643. And
Each of the first lower contact surface 642 and the second lower contact surface 643 is provided with a sliding material such as Teflon (registered trademark).

A pair of upper guide parts 63 and 63 are mutually arrange | positioned at intervals in the X direction. The distance between the pair of upper guide portions 63 and 63 is slightly larger than the dimension in the X direction of the main body portion 52 of the upper guide portion 5. Inner side surfaces 631 and 631 of the pair of upper guide portions 63 and 63 facing each other in the X direction are formed in a vertical plane.
An upper contact surface 65 that contacts the upper sliding surface 51 is formed in the entire region between the pair of upper guide portions 63, 63 on the lower surface of the main body portion 61.

The upper abutment surface 65 is formed in a substantially inverted V-shaped inclined surface with a substantially central portion in the X direction protruding upward along the Y direction. A bent portion of the substantially central portion in the Y direction of the upper contact surface 65 is referred to as an upper bent portion 651.
Of the upper contact surface 65, one side in the Y direction with respect to the upper bent portion 651 is defined as a first upper contact surface 652, and the other side in the Y direction with respect to the upper bent portion 651 is defined as a second upper contact surface 653. And
Each of the first upper contact surface 652 and the second upper contact surface 653 is provided with a sliding material such as Teflon (registered trademark).

When the main body 61 is disposed on the upper side of the lower guide 4, the lower contact surface 64 contacts the lower sliding surface 41 of the lower guide 4, and the pair of lower guides 62 and 62 are the lower guide 4. The main body 42 is disposed on both sides in the Y direction. The inner side surfaces 621 and 621 of the pair of lower guide portions 62 and 62 are opposed to the end surfaces 421 and 421 on both sides in the Y direction of the main body portion 42 of the lower guide portion 4. In the present embodiment, the sliding materials 622 and 622 are provided on the inner side surfaces 621 and 621 of the pair of lower guide portions 62 and 62, respectively, and the sliding materials 622 and 622 are the end surfaces 421 of the main body portion 42 of the lower guide portion 4. 421 abuts.
When the main body portion 61 is disposed below the upper guide portion 5, the upper contact surface 65 contacts the lower sliding surface 41 of the upper guide portion 5, and the pair of upper guide portions 63 and 63 are the upper guide portions. 5 of the main body 52 is disposed on both sides in the X direction. The inner side surfaces 631 and 631 of the pair of upper guide portions 63 and 63 are opposed to the end surfaces 521 and 521 on both sides in the X direction of the main body portion 52 of the upper guide portion 5. In the present embodiment, the sliding materials 632 and 632 are provided on the inner side surfaces 631 and 631 of the pair of upper guide portions 63 and 63, respectively, and the sliding materials 632 and 632 are the end surfaces 521 of the main body portion 52 of the upper guide portion 5. 521 abuts.

  As shown in FIG. 5, the seismic isolation device 3 having such a configuration is provided on the floor surface 15 of the rack warehouse 13 when an earthquake occurs and the floor surface 15 of the rack warehouse 13 and the RC mat 14 are relatively displaced in the horizontal direction. The slider 6 slides on the lower slide surface 41 and the upper slide surface 51 following the relative displacement between the lower guide portion 4 and the upper guide portion 5 provided on the RC mat 14. FIG. 5 is a diagram in which the dimensions in the X direction and the Y direction, which will be described later, are smaller than FIG. 3 as in FIG.

  As shown in FIG. 3, in the initial state (normal time) of the seismic isolation device 3, the slider 6 is disposed in the original position with respect to the lower guide portion 4 and the upper guide portion 5. In the slider 6 disposed in the original position, the first lower contact surface 642 contacts the first lower slide surface 412 of the lower guide portion 4, and the second lower contact surface 643 of the lower guide portion 4 2 abutting on the lower sliding surface 413, the first upper abutting surface 652 abutting on the first upper sliding surface 512 of the upper guiding portion 5, and the second upper abutting surface 653 on the second upper portion of the upper guiding portion 5. It is in contact with the sliding surface 513.

  As shown in FIG. 5A, when the slider 6 moves from the original position to the one side in the X direction with respect to the lower guide portion 4, the first lower contact surface 642 becomes the first lower slide surface 412. However, the lower sliding surface 41 is slid so as to rise above the first lower sliding surface 412 in a state where the second lower contacting surface 643 is separated from the second lower sliding surface 413. When the slider 6 moves from the original position to the other side in the X direction with respect to the lower guide portion 4, the second lower contact surface 643 is in contact with the second lower slide surface 413. The lower sliding surface 41 is slid so that the second lower sliding surface 413 is raised in a state where the contact surface 642 is separated from the first lower sliding surface 412.

  As shown in FIG. 5B, when the slider 6 moves from the original position to one side in the Y direction with respect to the upper guide portion 5, the first upper contact surface 652 becomes the first upper sliding surface 512. The upper sliding surface 51 is slid so as to descend the first upper sliding surface 512 in a state where the second upper abutting surface 653 is separated from the second upper sliding surface 513. When the slider 6 moves from the original position to the other side in the Y direction with respect to the upper guide portion 5, the second upper contact surface 653 is in contact with the second upper slide surface 513. The upper sliding surface 51 is slid so as to descend the second upper sliding surface 513 in a state where the contact surface 652 is separated from the first upper sliding surface 512.

  Thus, the height dimension of the slider 6 changes as it moves up and down relative to the lower guide part 4 and the upper guide part 5. However, in this embodiment, since the plurality of seismic isolation devices 3 provided in the seismic isolation layer 16 have the same inclination angle θ, an earthquake occurs and the lower guide part 4 and the upper guide part 5 Even if they are relatively displaced in the horizontal direction, the upper ends of the seismic isolation devices 3 have the same height, and the lower ends of the seismic isolation devices 3 are arranged at the same height. Thereby, even if the floor 15 of the rack warehouse 13 and the RC mat 14 are relatively displaced in the horizontal direction, the RC mat 14 is kept horizontal.

In the seismic isolation device 3, when the slider 6 and the lower guide portion 4 are relatively displaced in the X direction, the slider 6 is relatively displaced from the lower guide portion 4 so that the slider 6 moves up the lower sliding surface 41 of the lower guide portion 4. Therefore, the relative displacement between the slider 6 and the lower guide portion 4 is accumulated as potential energy (positional energy) and becomes a restoring force (inclination restoring force) for restoring the slider 6 to the original position. When the slider 6 and the upper guide portion 5 are relatively displaced in the Y direction, the upper guide portion 5 is relatively displaced with the slider 6 so as to rise above the inclined surface of the upper contact surface 65 of the slider 6. The relative displacement between the slider 6 and the upper guide portion 5 is accumulated as potential energy (positional energy), and becomes a restoring force (inclination restoring force) for restoring the slider 6 to the original position.
Assuming that the vertical load acting on the upper guide 5 is W, the inclination restoring force (horizontal force) F is expressed by the following equation as the inclination angle θ with respect to the horizontal plane and the friction coefficient μ of the inclined surface.
F = Wtan θ = (0.1 to 0.4) μW = (0.01 to 0.04) W
μW represents the frictional force.

The above seismic isolation device 3 is the same as the case where a constant load spring having a pre-tension force F is installed in the seismic isolation layer 16, and a constant restoring force F acts regardless of the amount of displacement of the seismic isolation layer 16. Become. If tan θ ≧ μ, the residual displacement can be completely removed. For example, as disclosed in Japanese Patent Application No. 2011-201873 filed by the applicant, the pre-tension force F is ½ of the friction force μW. Even if the value is equivalent to ˜1 / 10, the residual displacement can be substantially eliminated.
Although it is necessary to adjust the friction coefficient depending on the height of the rack structure 12 and the structure type of the rack warehouse 13, in this embodiment, μ ≦ 0.06 is set by using a low friction material.

As described above, in the present embodiment, the specifications of the damping device 2 (the specifications of the movable mass 22, the damping part 23, the horizontal spring 24, etc.) are based on the natural period of the rack structure having a non-seismic isolation structure. Is set.
Therefore, a rack structure having an inclined seismic isolation structure when a seismic isolation layer is provided between the floor surface and the RC mat, and a seismic isolation device similar to the seismic isolation device 3 of the present embodiment is provided in the seismic isolation layer. Is compared with the natural period of the rack structure of the non-base-isolated structure when the base isolation layer is not provided between the floor surface and the RC mat and the base isolation device 3 of this embodiment is not provided. Analysis was performed.

  As analysis conditions, the total number of racks in the rack structure is 13 (height: 20 m, height of the 13th stage: about 18 m)), and the mass is 924 t (self weight of the rack structure: 70 t + maximum of the contents) The weight is 350 t + the weight of the RC mat is about 500 t), and the degree of freedom of each mass point can be translated only in one direction.

  As shown in the table below, it can be seen that the natural period of the rack warehouse with non-base isolation structure and that with the inclined base isolation structure match. For this reason, in this embodiment, if the specifications of the damping device 2 are set based on the natural period of the rack structure having a non-base-isolated structure, the specifications are set based on the natural period of the rack structure having an inclined base-isolated structure. It turns out that it becomes the same value as what was done.

Next, operations and effects of the above-described rack warehouse vibration isolation system 1 will be described with reference to the drawings.
In the rack warehouse vibration damping system 1 according to this embodiment described above, the vibration damping device 2 functioning as a TMD is provided at the top of the rack structure 12, and the vibration isolation device is provided between the installation surface and the rack structure 12. 3 is provided. Thereby, when an earthquake occurs, the seismic isolation device 3 mainly reduces the acceleration in the region below the center of gravity of the structure in the rack structure 12, and the vibration damping device 2 mainly has the structure in the rack structure 12. The acceleration in the region above the center of gravity can be reduced. As a result, in the rack warehouse vibration isolation system 1 of the present invention, the acceleration can be reduced over the entire height of the rack structure 12.

By using the vibration damping device 2 and the seismic isolation device 3 together, even a structure having a small rigidity such as the rack warehouse 13 can exhibit the same effect as a structure having a predetermined rigidity.
By using the vibration damping device 2 and the seismic isolation device 3 in combination, a large response reduction effect can be obtained even for an earthquake wave that is less effective with the vibration damping device 2 alone.

Since the seismic isolation device 3 can restore the rack structure 12 to the original position by using the inclined surface, there is no need to provide a restoring spring, and the structure does not have spring rigidity. As a result, the seismic isolation device 3 is not easily affected by the characteristics of the input seismic wave and does not resonate with the seismic wave. Therefore, the acceleration can be reduced regardless of the characteristics of the input seismic wave, and the seismic isolation effect can be reduced. It can be demonstrated.
Since the seismic isolation device 3 does not have a natural period, the specifications of the vibration damping device 2 can be easily determined without considering the natural period of the seismic isolation device 3.
In particular, in this embodiment, the natural period of the movable mass 22 of the vibration damping device 2 is a rack structure having a non-base isolation structure in which the RC mat is fixed to the floor surface without the base isolation device 3 as in the present embodiment. Since it only needs to be set so as to synchronize with the primary period of the body, the specification of the vibration damping device 2 can be easily set without being affected by the characteristics of the seismic isolation device 3.

  The seismic isolation device 3 allows the rack 6 to move relative to the lower guide 4 and the X direction as well as relative to the upper guide 5 and the Y direction. Even if there is a peculiar uneven load or load fluctuation, it is possible to suppress the twist of the rack structure 12 with respect to the floor 15 of the rack warehouse 13 and to exhibit a stable response reduction effect.

  A rack warehouse having a vibration-isolation structure provided with the above-described rack warehouse vibration-isolation system 1 according to the present embodiment, a vibration damping device similar to the vibration damping device 2 according to the present embodiment is provided, and a vibration isolation device is provided. The response acceleration and response displacement at the time of an earthquake are calculated for each rack warehouse with no vibration control structure and with a non-base isolation / non-damping structure rack warehouse that is not equipped with a vibration control device or a seismic isolation device. A comparative analysis was performed.

As analysis conditions, the total number of racks in the rack structure is 13 (height: 20 m, height of the 13th stage: about 18 m)), and the mass is 924 t (self weight of the rack structure 12: 70 t + The maximum weight is 350 t + the weight of the RC mat 14 is about 500 t), and the degree of freedom of each mass point can be translated only in one direction, and the excitation direction is the direction in which the stored items in the horizontal direction are stored in the rack.
The seismic wave consists of three standard waves (El Centro wave, TAFT wave, Hachinohe wave, 50 kine standardization), notification wave (Kanto phase, Kobe phase, random phase), Tokyo Bay northern earthquake (artificial wave), and Kumamoto main shock did.
The effective mass of the damping device is 3%, and the damping constant is 10%.

As shown in FIG. 6, in the rack warehouse having the vibration isolation structure provided with the vibration isolation system 1 of the rack warehouse according to the present embodiment, the response acceleration is increased from the lower part to the higher part of the rack warehouse as compared with the rack warehouse of other structures. It can be confirmed that it can be reduced.
As shown in FIG. 7, in the rack warehouse having a vibration-isolation structure provided with the rack warehouse vibration-isolation system 1 according to the present embodiment, the response displacement between the low-rise part and the high-rise part of the rack warehouse is compared with the rack warehouse having another structure. It can be confirmed that the difference can be reduced.

Further, in a rack warehouse having a damping structure provided with only the damping device 2, the response acceleration may not be reduced depending on the characteristics of the seismic wave. However, the rack warehouse with the damping system 1 for the rack warehouse according to this embodiment is not provided. In a rack warehouse with a damping structure, it can be confirmed that the effect of seismic waves is small and response acceleration can be reduced.
Furthermore, in the case of this analysis, if the rack warehouse has a vibration-isolated structure provided with the rack warehouse vibration-isolation system 1 according to the present embodiment, the response acceleration is an indication of the collapse of the load except for the top of the rack structure. It can be confirmed that it is 500 gal (5 m / sec ² ) or less. In this analysis, the effective mass of the vibration damping device is 3%, but the response acceleration at the top of the rack structure may be 500 gal (5 m / sec ² ) or less by increasing the effective mass ratio. It becomes possible.

As mentioned above, although embodiment of the anti-vibration vibration system 1 of the rack warehouse by this invention was described, this invention is not limited to said embodiment, In the range which does not deviate from the meaning, it can change suitably.
For example, in the above-described embodiment, a plurality of vibration damping devices 2 of the same form are provided for the rack warehouse 13 and a plurality of seismic isolation devices 3 of the same form are provided. May be set as appropriate. Further, for example, a plurality of vibration control devices 2 and a plurality of seismic isolation devices 3 having different specifications may be provided in the rack warehouse 13.
In the above embodiment, the natural period of the movable mass 22 is that of the rack structure 12 when it is assumed that the seismic isolation device 3 is not provided and the RC mat 14 is fixed to the floor 15 of the rack warehouse 13. Although it is set to a value that synchronizes with the primary period, it may be set to a value other than this.

DESCRIPTION OF SYMBOLS 1 Anti-vibration control system of rack warehouse 2 Vibration control device 3 Seismic isolation device 4 Lower guide part 5 Upper guide part 6 Slider 11 Rack 12 Rack structure 13 Rack warehouse 14 RC mat 15 Floor (installation surface)
16 Seismic isolation layer 22 Moving mass 41 Lower sliding surface 51 Upper sliding surface

Claims (2)

In a vibration isolation system of a rack warehouse where a rack structure in which racks are connected in multiple stages on the installation surface is installed,
A vibration damping device provided at the top of the rack structure and functioning as a TMD;
A seismic isolation device provided between the installation surface and the rack structure,
The seismic isolation device is provided at an upper portion of the installation surface, and a lower guide portion having a lower sliding surface inclined in a V shape that protrudes downward along one horizontal direction,
An upper guide portion provided at the bottom of the rack structure and having an upper sliding surface inclined in an inverted V shape that protrudes upward along another horizontal direction orthogonal to the one horizontal direction;
It is disposed between the lower sliding surface and the upper sliding surface, and is relatively displaceable in the horizontal direction with the lower guide portion along the lower sliding surface. A vibration isolation system for a rack warehouse, comprising: the upper guide portion and a slider that can be relatively displaced in the horizontal direction along the upper guide portion.   The natural period of the movable mass of the vibration damping device is synchronized with the primary period of the rack structure when it is assumed that the seismic isolation device is not provided and the rack structure is fixed to the installation surface. 2. The vibration isolation system for a rack warehouse according to claim 1, wherein

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