JP6974199B2 - Anti-vibration structure - Google Patents

Description

The present invention relates to a vibration-proof structure that reduces vibration generated in a floor slab when a traveling carriage runs on wheels on a rail installed on the floor slab of a building.

There is an automated warehouse that uses a stacker crane to deliver luggage to the entrance / exit and shelves. Generally, a stacker crane is a traveling carriage as a traveling device, a pair of masts erected on the traveling carriage, an elevating table provided on the mast so as to be able to move up and down, and a slide fork provided on the elevating table so as to be movable back and forth. It is configured to have and. Then, the traveling trolley is wheeled on the rail installed on the floor slab so as to be arranged in front of the rack in which the luggage is stored, and the elevator is raised and lowered along the mast to move to a predetermined place. Move the lift.

For example, Patent Document 1 discloses a stacker crane in which a wheel traveling on a rail and a holding roller for holding the rail from both left and right sides are used as one wheel unit.

In this way, the stacker crane runs the traveling vehicle as a traveling device on the rail installed on the floor slab on wheels, and the vibration generated in the rail due to the wheel traveling of the traveling vehicle is transmitted to the floor slab. The problem is that the floor slab vibrates.

For example, when vibration is generated in the floor slab, solid propagating sound is radiated from the floor slab or the wall, floor, ceiling, etc. to which the vibration of the floor slab is transmitted, and the habitability is deteriorated. Is possible. In addition, this problem becomes remarkable when the stacker crane is installed on the floor slab provided on the second floor or higher of the building.

Japanese Unexamined Patent Publication No. 6-40519

In consideration of such facts, it is an object of the present invention to reduce the vibration generated in the floor slab by the traveling device traveling on the wheels on the rail installed in the floor slab.

The anti-vibration structure according to the first aspect includes a floor slab provided in a building, a plate-shaped elastic member provided on the floor slab, a plate-shaped mass body provided on the elastic member, and the above-mentioned. It has a rail that is installed on the mass body and on which the traveling device travels on wheels.

According to the vibration-proof structure according to the first aspect, when the traveling device travels on wheels on the rail, the vibration generated in the rail is input to the mass body, and the mass body, the elastic member and the floor slab are connected in series in this order. Due to the generated vibration system, the vibration becomes smaller than this vibration and is output from the floor slab.

As a result, it is possible to reduce the vibration generated in the floor slab when the traveling device travels on the rails on the wheels. Further, it is possible to reduce the solid propagating sound radiated from the floor slab or the wall, floor, ceiling or the like to which the vibration of the floor slab is transmitted.

In the anti-vibration structure according to the second aspect, in the anti-vibration structure according to the first aspect, a plate member having a higher shear rigidity than the elastic member is provided in the middle in the thickness direction of the elastic member.

According to the vibration-proof structure according to the second aspect, the elastic member provided between the floor slab and the plate member and the elastic member provided between the plate member and the mass body are respectively deformed and deformed. Due to the vibration damping effect due to the deformation, it is possible to add damping to the vibration of the mass body. As a result, it is possible to suppress a decrease in the anti-vibration effect in the vicinity of the natural frequency of the mass body.

As the vibration-proof structure according to the third aspect, in the vibration-proof structure according to the first aspect, an elastic body having a shear rigidity smaller than that of the mass body is provided in the middle of the thickness direction of the mass body.

According to the vibration-proof structure according to the third aspect, the elastic member provided between the floor slab and the mass body and the elastic body provided in the middle in the thickness direction of the mass body are respectively displaced and deformed. By the vibration damping effect of, it is possible to add damping to the vibration of the mass body. As a result, it is possible to suppress a decrease in the anti-vibration effect in the vicinity of the natural frequency of the mass body.

Since the present invention has the above configuration, it is possible to reduce the vibration generated in the floor slab by the traveling device traveling on the rails installed on the floor slab.

It is a vertical sectional view which shows the building which concerns on embodiment of this invention. It is a front view which shows the vibration-proof structure which concerns on embodiment of this invention. It is a perspective view which shows the analysis model of the anti-vibration structure which concerns on embodiment of this invention. It is a perspective view which shows the analysis model of the anti-vibration structure which concerns on embodiment of this invention. It is a diagram which shows the response curve of the vibration-proof structure which concerns on embodiment of this invention. It is a front view which shows the variation of the anti-vibration structure which concerns on embodiment of this invention. It is a front view which shows the variation of the anti-vibration structure which concerns on embodiment of this invention. It is a diagram which shows the response curve of the anti-vibration structure obtained by the experiment which concerns on embodiment of this invention. It is a front view which shows the test body used for the experiment which concerns on embodiment of this invention. It is a front view which shows the test body used for the experiment which concerns on embodiment of this invention. It is a front view which shows the test body used for the experiment which concerns on embodiment of this invention. It is a front view which shows the variation of the anti-vibration structure which concerns on embodiment of this invention. It is a front view which shows the variation of the anti-vibration structure which concerns on embodiment of this invention. It is a front view which shows the variation of the anti-vibration structure which concerns on embodiment of this invention.

An embodiment of the present invention will be described with reference to the drawings. First, the anti-vibration structure according to the embodiment of the present invention will be described.

As shown in the vertical cross-sectional view of FIG. 1, a reinforced concrete building 12 as an automatic warehouse is built on the ground 10, and on a floor slab 14 as a structural floor provided on the second floor in this building 12. A stacker crane 16 is arranged. Further, racks 20 and 22 for storing luggage 18 are installed facing each other on the floor slab 14.

As shown in the front view of FIGS. 1 and 2, the anti-vibration structure 24 includes a floor slab 14 provided in the building 12, an anti-vibration member 26 as an elastic member, and a track slab 28 as a mass body. It is configured to have a rail 30 and the like.

The anti-vibration member 26 is a plate-shaped member provided on the floor slab 14, and is formed of an elastic material. The anti-vibration member 26 may be any member having elasticity. For example, the anti-vibration member 26 may be formed of a viscoelastic material.

The track slab 28 is a plate-shaped member provided on the anti-vibration member 26 and supported by the anti-vibration member 26, and is formed of reinforced concrete. The track slab 28 may be formed of something other than reinforced concrete as long as it supports the rail 30 and has a predetermined weight. For example, the track slab 28 may be a steel member.

The track slab 28 is integrally formed in a strip shape over the entire length of the traveling path 32 of the stacker crane 16. Further, the anti-vibration member 26 is provided in a band shape on substantially the entire lower surface of the track slab 28 over the entire length of the track slab 28.

The rail 30 is installed on the track slab 28 over the entire length of the track 32 of the stacker crane 16 so as to be arranged in front of the racks 20 and 22. That is, the rail 30 is supported on the track slab 28 provided on the floor slab 14 via the vibration isolator member 26, and the racks 20 and 22 are directly supported on the floor slab 14.

The stacker crane 16 is provided on a traveling carriage 34 as a traveling device, a pair of masts 36 erected on the traveling carriage 34, an elevating table 38 provided so as to be able to move up and down between the pair of masts 36, and an elevating table 38. It is configured to have a slide fork (not shown) provided so as to be movable back and forth.

The traveling carriage 34 is rotatably mounted on the rail 30 and is driven by a motor (not shown) to run on the rail 30 with steel drive wheels 40 and rotatably mounted on the rail 30. It is provided with a driven wheel (not shown) that follows the drive wheel 40 and travels on the rail 30, and steel holding wheels 42 and 44 that sandwich the rail 30 from both the left and right sides, and is driven by the drive wheel 40. The carriage 34 is wheeled on the rail 30 by the wheels, and the elevator 38 is moved up and down along the mast 36 to move the elevator 38 to a predetermined place.

Further, the traveling bogie 34 travels on the rail 30 with the luggage 18 loaded on the elevating platform 38. As a result, the elastic anti-vibration member 26 supports the weights of the track slab 28, the stacker crane 16, and the luggage 18, so that the traveling carriage 34 sinks and the level of the traveling carriage 34 in the vertical direction becomes low. Can be considered. Therefore, the thickness of the track slab 28 is set so that the relative displacement between the racks 20 and 22 and the rail 30 on which the traveling bogie 34 is mounted in the vertical direction is equal to or less than the allowable value.

Specifically, the allowable deflection amount of the track slab 28 is set so that the relative displacement between the racks 20 and 22 and the rail 30 on which the traveling bogie 34 is mounted in the vertical direction is equal to or less than the allowable value, and the thickness of the track slab 28 is set. The amount of deflection should be less than or equal to this allowable amount of deflection.

3 and 4 show an analysis model 50 of the anti-vibration structure 24. In the analysis model 50, the track slab 28 is a member made of reinforced concrete having a length of 33 m, a width of 125 cm, and a thickness of 150 mm, and the rail 30 is an H-shaped member having a web height of 150 mm, a flange width of 50 mm, a web thickness of 5 mm, and a flange thickness of 7 mm. It is made of steel.

Further, in order to sufficiently reduce the vibration in the 63 Hz band or higher, the natural frequency of the vibration system 46 (see FIG. 2) in which the track slab 28, the vibration isolator 26, and the floor slab 14 are connected in series in this order. Is set to 15 Hz, and three springs 52 for supporting the orbital slab 28 are arranged at 1 m intervals with respect to the length direction of the orbital slab 28 so as to have this natural frequency, and the length of the orbital slab 28 is set. A spring constant of 1292 N / mm in the direction is set, and three springs 54 having a spring constant twice that of the spring 52 that support both ends of the track slab 28 are arranged to form a spring in the width direction at the end of the track slab 28. The constant is 2584 N / mm.

As a result of numerical analysis of this analysis model 50, the maximum amount of deflection of the track slab 28 when the traveling bogie 34 is placed in the center of the rail 30 in the length direction 56 is 0.62 mm, and the traveling bogie 34 is the length of the rail 30. The maximum amount of deflection of the orbital slab 28 when resting on the end of the vertical direction 56 was 0.99 mm.

From this, it can be seen that if the thickness of the track slab 28 is 150 mm or more, the maximum deflection amount of the track slab 28 can be 1 mm or less.

Next, the action and effect of the anti-vibration structure according to the embodiment of the present invention will be described.

In the vibration-proof structure 24 of the present embodiment, as shown in FIG. 2, when the traveling vehicle 34 travels on the rail 30 on wheels, the vibration of the frequency of 63 Hz band or higher generated on the rail 30 is transmitted to the track slab 28. The vibration system 46 in which the track slab 28, the vibration isolator 26, and the floor slab 14 are connected in series in this order becomes a vibration smaller than the vibration input to the track slab 28 and is output from the floor slab 14. ..

As a result, the vibration generated in the floor slab 14 due to the wheel traveling of the traveling carriage 34 on the rail 30 can be reduced. Further, it is possible to reduce the solid propagating sound radiated from the wall, floor, ceiling, etc. of the building 12 to which the vibration of the floor slab 14 or the floor slab 14 is transmitted.

The graph of FIG. 5 shows an example of the response curve in the anti-vibration structure 24. The horizontal axis of the graph shows the value of N / f obtained by dividing the forced frequency N of the vibration input to the track slab 28 by the natural frequency f of the vibration system 46, and the vertical axis shows the value from the floor slab 14. The transmission rate obtained by dividing the output force by the force input to the orbital slab 28 is shown.

The value 48 is a response curve when the natural frequency of the vibration system 46 is set to 15 Hz (the transmission coefficient is set to the peak value when N / f = 1.0).

From the value 48, when the N / f becomes 1.4 or more (when the forced frequency N becomes 21 Hz or more), the transmission rate becomes 1.00 or less, and the traveling carriage 34 of the stacker crane 16 moves on the rail 30. It can be seen that the vibration reduction effect is exhibited in the vibration of the 63 Hz band (band of 45 Hz or more and 90 Hz or less) or more, which is considered to occur when the wheel travels.

The anti-vibration structure according to the embodiment of the present invention has been described above.

In the vibration-proof structure 24 of the present embodiment, as shown in FIG. 2, an example in which the vibration-proof member 26 is provided on substantially the entire lower surface of the track slab 28 over the entire length of the track slab 28 is shown. The swing member 26 may be partially provided with respect to the length direction of the track slab 28. If the vibration damping member 26 is provided on substantially the entire lower surface of the track slab 28, the vibration damping effect due to the shear deformation of the vibration damping member 26 can be enhanced.

Further, in the anti-vibration structure 24 of the present embodiment, as shown in FIG. 1, an example in which the stacker crane 16 is arranged on the floor slab 14 as the structural floor provided on the second floor in the building 12 is shown. The floor slab on which the stacker crane 16 of the present embodiment is arranged may be on any floor of the building.

In recent years, in automated warehouses, stacker cranes are increasingly placed on floor slabs provided on the second floor or higher in a building in order to improve workability.

When the stacker crane is placed on the soil floor provided on the first floor of the building, the soil floor is in contact with the ground, so that the damping is high, and the vibration energy can be expected to dissipate to the ground. However, if the stacker crane is placed on the floor slab installed on the second floor or higher in the building, this floor slab has low attenuation and vibration energy cannot be expected to dissipate to the ground, so it runs on the rail. When the trolley runs on wheels, the vibration generated in the floor slab increases, and the solid propagating sound radiated from the walls, floor, ceiling, etc. of the floor slab or the floor slab to which the vibration is transmitted also increases. There is a concern that it will end up.

On the other hand, in the anti-vibration structure 24 of the present embodiment, as shown in FIG. 1, even when the stacker crane 16 is arranged on the floor slab 14 provided on the second floor or higher in the building 12, the rail 30 is used. The vibration generated in the floor slab 14 can be reduced by the traveling vehicle 34 traveling on the wheels, and the vibration of the floor slab 14 or the floor slab 14 is transmitted to the wall, floor, and ceiling of the building 12. It is possible to reduce the solid propagating sound radiated from the above.

Further, in the present embodiment, as shown in FIG. 2, an example in which the anti-vibration structure 24 is configured by having the floor slab 14, the anti-vibration member 26, the track slab 28, and the rail 30 is shown. As in the anti-vibration structure 58 shown in the front view, a plate member 60 made of a steel plate having a higher shear rigidity than the anti-vibration member 26 may be provided in the middle of the anti-vibration member 26 in the thickness direction.

In the vibration-proof structure 58, the floor slab 14, the first spring (lower vibration-proof member 26 (hereinafter referred to as “vibration-proof member 26A”)), the first mass body (plate member 60), and the second spring (upper side). The vibration-proof member 26 (hereinafter referred to as “vibration-proof member 26B”) and the second mass body (track slab 28) are connected in series to form a vibration system 66.

Further, in the anti-vibration structure 58, the anti-vibration member 26A provided between the floor slab 14 and the plate member 60 and the anti-vibration member 26B provided between the plate member 60 and the track slab 28 are respectively deformed. However, the vibration damping effect of this shear deformation can add damping to the vibration of the orbital slab 28. As a result, it is possible to suppress a decrease in the anti-vibration effect in the vicinity of the natural frequency of the track slab 28.

The plate member 60 may be a plate-shaped member having a higher shear rigidity than the anti-vibration member 26. Further, as in the vibration-proof structure 68 shown in the front view of FIG. 7, the plate member may be a corrugated steel plate 70.

The graph of FIG. 8 shows the results of experiments performed on the test bodies 72, 74, and 76 shown in the front view of FIGS. 9 to 11.

As shown in FIG. 9, the test body 72 is composed only of the floor slab 78 made of reinforced concrete.

As shown in FIG. 10, the test body 74 includes a floor slab 78 made of reinforced concrete, an elastic member 80 mounted on the floor slab 78, and a concrete plate 82 as a mass body mounted on the elastic member 80. It has the same configuration as the anti-vibration structure 24 (see FIG. 2).

The thickness of the elastic member 80 is 50 mm, and the thickness of the concrete plate 82 is 50 mm. The planar shapes of the elastic member 80 and the concrete plate 82 are 300 mm in length and 300 mm in width.

As shown in FIG. 11, the test body 76 includes a floor slab 78 made of reinforced concrete, an elastic member 84 mounted on the floor slab 78, and a steel plate 86 as a plate member mounted on the elastic member 84. , The elastic member 88 placed on the steel plate 86 and the concrete plate 82 as a mass body placed on the elastic member 88 are provided, and the vibration-proof structure 58 (FIG. 6 is shown). It has the same configuration as (see).

The thickness of the elastic member 84 is 25 mm, the thickness of the steel plate 86 is 1 mm, the thickness of the elastic member 88 is 25 mm, and the thickness of the concrete plate 82 is 50 mm. The planar shapes of the elastic members 84 and 88, the steel plate 86, and the concrete plate 82 are 300 mm in length and 300 mm in width.

In the experiment, the floor slab 78 (in the case of the test body 72 in FIG. 9) or the concrete plate 82 (in the case of the test bodies 74 and 76 in FIGS. Case) was hit, and the exciting force F applied to the floor slab 78 or the concrete plate 82 by this hit and the acceleration of the vibration generated in the floor slab 78 at this time were measured. The acceleration of the vibration generated in the floor slab 78 was measured by an acceleration sensor 90 installed on the floor slab 78.

On the horizontal axis of the graph of FIG. 8, the force applied to the floor slab 78 (in the case of the test body 72 of FIG. 9) or the concrete plate 82 (in the case of the test bodies 74 and 76 of FIGS. 10 and 11) by the impact of the impulse hammer. The frequency of the vibration force F is shown, and the vertical axis shows the transmission function (the ratio of the acceleration of the vibration generated in the floor slab 78 to the vibration force F applied to the floor slab 78 or the concrete plate 82). There is.

The value 92 in the graph of FIG. 8 is a value for the test body 72 shown in FIG. 9, the value 94 is a value for the test body 74 shown in FIG. 10, and the value 96 is a value for the test body 76 shown in FIG. Is.

In the frequency band of 80 Hz or higher, the transfer function of the value 94 (test body 74 having the same configuration as the vibration isolation structure 24) is about 10 dB smaller than that of the value 92 (test body 72 without vibration isolation). It can be seen that the anti-vibration structure 24 exerts an anti-vibration effect.

Further, in the frequency band of 120 Hz or higher, the transfer function of the value 96 (test body 76 having the same configuration as the vibration isolation structure 58) is higher than that of the value 94 (test body 74 having the same configuration as the vibration isolation structure 24). It is smaller, and it can be seen that a higher anti-vibration effect can be obtained by arranging the plate member between the anti-vibration members (elastic members) of the anti-vibration structure 58.

Further, even in the frequency band of 80 Hz or less in which the value 94 (test body 74 having the same configuration as the vibration isolation structure 24) is amplified as compared with the value 92 (test body 72 without vibration isolation), the value 96 (vibration isolation). The test body 76) having the same configuration as the structure 58) has a smaller transfer function than the value 94, and it can be seen that the vibration-proof structure 58 exerts an effect of suppressing amplification in the frequency band of 80 Hz or less.

Further, in the present embodiment, as shown in FIG. 2, an example in which the vibration-proof structure 24 is configured by having the floor slab 14, the vibration-proof member 26, the track slab 28, and the rail 30 is shown. As in the vibration-proof structure 98 shown in the front view, an elastic body 100 having a shear rigidity smaller than that of the track slab 28 may be provided in the middle of the track slab 28 in the thickness direction.

In the vibration-proof structure 98, the floor slab 14, the first spring (vibration-proof member 26), the first mass body (lower track slab 28 (hereinafter referred to as “track slab 28A”)), and the second spring (elastic body). 100), a second mass body (upper orbital slab 28 (hereinafter referred to as “orbital slab 28B”)) constitutes a vibration system 106 connected in series.

Further, in the vibration-proof structure 98, the vibration-proof member 26 provided between the floor slab 14 and the track slab 28A and the track slab 28 provided in the middle in the thickness direction (the track slab 28A and the track slab 28B). The elastic bodies 100 (provided between them) are deformed by sliding, and the vibration damping effect due to the sliding deformation can add damping to the vibration of the track slab 28. As a result, it is possible to suppress a decrease in the anti-vibration effect in the vicinity of the natural frequency of the track slab 28.

The elastic body 100 may be a plate-shaped member having elasticity having a shear rigidity smaller than that of the track slab 28. For example, the elastic body 100 may be formed of a viscoelastic material.

Further, in the present embodiment, as shown in FIG. 2, an example in which the vibration-proof structure 24 is configured by having the floor slab 14, the vibration-proof member 26, the track slab 28, and the rail 30 is shown. As in the anti-vibration structure 108 shown in the front view, the pull-out preventing means 110 for preventing the pull-out of the track slab 28 caused by an earthquake or the like may be provided.

The pull-out preventing means 110 is provided at both ends of the track slab 28, and includes a bolt 118, an elastic annular member 120, an annular bearing plate 122, and nuts 124 and 126. .. The lower end 112 of the bolt 118 is embedded and fixed in the floor slab 14, and the through hole 114 formed in the track slab 28 and the penetration formed in the vibration isolator 26 so as to communicate with the through hole 114. It is inserted into the hole 116. The annular member 120 is arranged on the track slab 28 and the bolt 118 is inserted. The bearing plate 122 is arranged on the annular member 120, and the bolt 118 is inserted. The nuts 124 and 126 are arranged on the bearing plate 122 and fixed to the upper end of the bolt 118. A plurality of pull-out preventing means 110 are provided with respect to the length direction of the track slab 28.

The inner diameters of the through holes 114 and 116 are larger than the outer diameter of the bolt 118 so as not to hinder the vertical expansion and contraction of the vibration isolator member 26 and the vertical movement of the track slab 28.

In the pull-out prevention means 110, the annular member 120 allows the track slab 28 to move in the vertical direction, and the pull-out force acts on the track slab 28 so that the amount of movement of the track slab 28 in the upward direction becomes a predetermined value. Occasionally, the pulling force acting on the track slab 28 is transmitted to the floor slab 14 via the bolt 118. This makes it possible to prevent the orbital slab 28 from being pulled out due to an earthquake or the like.

Further, in the present embodiment, as shown in FIG. 2, an example in which the anti-vibration structure 24 is configured by having the floor slab 14, the anti-vibration member 26, the track slab 28, and the rail 30 is shown. As in the anti-vibration structure 128 shown in the front view, the lateral slip prevention means 130 may be provided.

The lateral slip prevention means 130 is a laminated rubber 136 provided between the reaction force member 132 fixed on the floor slab 14, the reaction force wall 134 vertically provided on the reaction force member 132, and the end face of the track slab 28. It is configured to have and.

In the lateral slip prevention means 130, the laminated rubber 136 allows the track slab 28 to move in the vertical direction and restrains the track slab 28 from moving in the lateral direction. This makes it possible to prevent lateral displacement of the track slab 28.

Further, in the present embodiment, an example is shown in which the traveling device traveling on the rail 30 on wheels is a traveling carriage 34 constituting the stacker crane 16, but the traveling device is long as it travels on wheels on the rail 30. good.

Further, in the present embodiment, as shown in FIG. 1, an example in which the building 12 is made of reinforced concrete is shown, but the building 12 has a reinforced concrete structure, a steel frame structure, a steel frame reinforced concrete structure, and a CFT structure (Concrete-Filled Steel Tube:). It may be of various structures and scales, such as a filled steel pipe concrete structure) and a mixed structure thereof.

Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and it is needless to say that the present invention can be carried out in various embodiments without departing from the gist of the present invention.

12 Building 14 Floor slabs 24, 58, 68, 98, 108, 128 Anti-vibration structure 26 Anti-vibration member (elastic member)
28 Orbital slab (mass body)
30 Rail 34 Traveling bogie (traveling device)
60 Plate member 100 Elastic body

Claims (1)

The floor slabs in the building and
A plate-shaped elastic member provided on the floor slab and
A plate-shaped mass body provided on the elastic member and
A rail installed on the mass body and on which the traveling device travels on wheels,
It has a plate member provided in the middle of the elastic member in the thickness direction and having a higher shear rigidity than the elastic member.
The plate member is a corrugated steel plate that is corrugated when viewed from the direction in which the rail extends.
A plurality of the elastic members are provided, and are arranged between the mass body and the top of the corrugated steel plate and between the floor slab and the bottom of the corrugated steel plate, respectively.
Anti-vibration structure.

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