JP3884837B2 - Isolation floor device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vibration-isolating floor device in which a floor is elastically supported by a slab below the floor so that vertical vibrations input from the slab to the floor are isolated.
[0002]
[Prior art]
In the case of a room where precision equipment such as computer equipment and measurement control equipment is installed, it is desirable that those floors be isolated floors that can block external vibrations (isolation). As a floor device, a floor support frame is disposed so as to be vertically displaceable with respect to a slab which is a support base below the floor apparatus, and the support frame is elastically supported on the slab via a number of vibration isolation units using coil springs. There is a thing of such a structure.
[0003]
Here, in such a vibration-isolating floor device, the natural period of the floor is determined by the spring constant of the coil spring and the floor load. Conventionally, the coil spring has a spring regardless of the supporting load. Using a constant constant linear characteristic, the spring constant is determined according to the floor load including the weight of equipment installed on the floor surface, so that the natural period of the floor is suitable for vibration isolation. Value. Further, a level adjustment bolt is interposed between the support frame and the vibration isolation unit to absorb the displacement of the coil spring that contracts in accordance with the floor load and adjust the floor surface to a predetermined height.
[0004]
[Problems to be solved by the invention]
However, in the above conventional vibration isolation floor device, the coil spring of the vibration isolation unit uses a linear spring with a constant spring constant, so that the equipment installed in the room is replaced, expanded, or laid out. When the floor load changes due to a change or the like, the natural period of the floor also changes accordingly. For this reason, after such a change in floor load occurs, the natural period of the floor suitable for the above-mentioned vibration isolation cannot be maintained, and the vibration isolation function is significantly deteriorated. Therefore, in such a case, it is necessary to replace the vibration isolator unit with a spring constant suitable for the changed floor load, and there is a problem that a very large work is required.
[0005]
In addition, in order to more effectively isolate the floor elastically supported by the vibration isolation unit from vibration external forces such as earthquakes, the natural period T determined by the floor load and the rigidity of the coil spring of the vibration isolation unit is about 1.2 seconds. Although it is desirable to make the period long, it is necessary to set the rigidity (spring constant) of the coil spring low.
[0006]
However, if the rigidity of the coil spring is lowered, the amount of spring contraction (displacement) due to the floor load increases, and the coil spring expansion / contraction stroke can effectively absorb external vibrations such as earthquakes in this greatly displaced state. Therefore, in a vibration-isolating floor device using a coil spring having a linear characteristic as in the prior art, the length of the coil spring is inevitably long. Therefore, it is necessary to set a large clearance between the floor on which the coil spring is arranged and the slab. Therefore, if an attempt is made to install a vibration-isolating floor with a longer period, the floor height will increase accordingly. There was a problem that the height of the entire building would become larger than necessary. In other words, this means that it is difficult to install a conventional vibration-isolating floor in an existing building that does not have enough room for the floor height and to increase the period.
[0007]
On the other hand, it is conceivable to adopt an air spring as a spring that can easily increase the period, but in order to construct a vibration-isolating floor device incorporating the air spring, a control panel, various air devices, piping, auxiliary tanks, etc. A large number of peripheral devices and parts are required, which increases the cost of the apparatus and increases the running cost due to periodic inspection and maintenance and parts replacement.
[0008]
The present invention has been made in view of the above-described conventional problems. The purpose of the present invention is to maintain the natural period of the floor within a substantially constant range regardless of the size of the floor load. An object of the present invention is to provide a vibration-isolating floor device that can increase the natural period without increasing the clearance between the two.
[0009]
[Means for Solving the Problems]
In order to achieve such an object, the vibration-isolating floor device according to the present invention arranges a floor so as to be vertically displaceable with respect to a slab below the floor, and from the slab side by a coil spring interposed between the floor and the slab. in immune Fuyuka device designed to vibration isolation of the vibrations transmitted to the floor, to the coil spring, with a spring having a nonlinear spring characteristic that the spring constant increases continuously with respect to increase in floor loading, the floor Has a floor surface material on which equipment is installed, a frame, and support legs provided on the frame and supporting the floor surface material, and the frames disposed on both sides of the coil spring include: The coil springs are connected to each other so as to straddle the upper half of the coil spring .
[0010]
The operation of the vibration-isolating floor device of the present invention having the above configuration is described. Since the spring having a nonlinear characteristic in which the spring constant continuously increases with an increase in the floor load is used as the coil spring, [Load / Spring The natural period of the floor, which is proportional to the square root of the [Constant], can be set to be substantially constant regardless of the floor load fluctuation, and the vibration isolation effect against vibration external forces such as earthquakes is related to the load fluctuation of the floor load. And can be held well. In addition, since the spring constant when the floor load is large becomes large, the amount of shrinkage at the time of the large load becomes small, and the overall length of the coil spring can be made as short as possible to suppress the height of the vibration isolation floor device. This makes it easier to increase the natural period of the floor. The floor includes a floor surface material on which devices are installed, a frame, and support legs provided on the frame and supporting the floor surface material, and are disposed on both sides of the coil spring. Since the frame is configured to be coupled to each other so as to straddle the upper half of the coil spring in a U-shape, the coil spring can be effectively installed between the floor and the slab.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 4 show an embodiment of the vibration isolation floor device of the present invention, FIG. 1 is a sectional view of the vibration isolation floor device, and FIG. 2 is an enlarged sectional view showing a coil spring used in the vibration isolation floor device. 3 is a characteristic diagram showing the relationship between the amount of deformation of the coil spring and the load fluctuation, and FIG. 4 is a characteristic diagram showing the relationship between the floor load and the natural period of the floor.
[0012]
As shown in FIG. 1, the vibration-isolating floor device according to the present embodiment arranges a floor 12 so as to be vertically displaceable with respect to a slab 14 that is a support base below the floor 12 and dampens the vibration between the floor 12 and the slab 14. A unit 10 is interposed, and a floor load is supported by a coil spring 16 provided in the vibration isolation unit 10 and vibration transmitted from the slab 14 side to the floor 12 is isolated. .
[0013]
Here, as a basic configuration of the vibration isolation unit 10 in the present embodiment, a spring having a non-linear characteristic in which the spring constant K with respect to the fluctuation of the floor load F gradually increases is used for the coil spring 16. Yes.
[0014]
The vibration isolation unit 10 includes a base plate 18 installed on the slab 14 and an upper mounting plate 20 provided on the floor 12 side, and the coil spring 16 is disposed between the base plate 18 and the upper mounting plate 20. Is done. A guide column 22 is erected from the center of the base plate 18, the coil spring 16 is disposed around the guide column 22, and the center of the upper mounting plate 20 slides on the guide column 22. It is inserted freely.
[0015]
A spring seat 21 having a guide portion 21 a inserted through the guide column 22 is attached to the upper end of the coil spring 16. The base plate 18 and the upper mounting plate 20 are provided with cylindrical portions 18a and 20a that cover the outer peripheral side of the coil spring 16, respectively.
[0016]
On the upper surface of the upper mounting plate 20, a rectangular connecting plate 25 extending in the left-right direction in the drawing is integrally welded, and the connecting plate 25 is sandwiched by avoiding the guide column 22. They are juxtaposed on both sides in the orthogonal direction of the paper surface shown. Further, frame connecting members 24 made of L-shaped plate members extending downward from the sides are integrally joined to the left and right sides of these connecting plates 25 by bolts. Is integrally welded to one end of an S frame 28 that is horizontally disposed. That is, the frames 28 and 28 arranged on the left and right sides of the vibration isolation unit 10 are coupled to the upper mounting plate 20 of the vibration isolation unit 10 via the frame coupling member 24 and the coupling plate 25, respectively. Both the frames 28 and 28 are connected to each other by the frame connecting members 24 and 24 and the connecting plate 25 so as to straddle the upper half of the coil spring 16 in a U shape. Further, the other ends of the frames 28 and 28 are coupled to adjacent vibration-isolating units (not shown) via frame connecting members or the like, and both ends are respectively supported by the vibration-isolating unit 10 and horizontally disposed. It has become.
[0017]
Further, the upper mounting plate 20 is provided with a level adjusting bolt 26 which is screwed to the upper mounting plate 20, and the tip of the upper mounting plate 20 penetrates the upper mounting plate 20 and comes into contact with the spring seat 21 at the upper end of the coil spring 16. Yes.
[0018]
The floor material 13 is supported on the upper side of the frame 28 via the support legs 30, and the floor 12 itself composed of the floor material 13, the support legs 30, the frame 28, the frame connecting member 24, and the like. The load and the load of equipment and the like placed on the floor 12 are input to the spring seat 21 of the vibration isolation unit 10 through the connection plate 25, the upper mounting plate 20 and the level adjustment bolt 26. The floor member 13 located above the guide column 22 is provided with an inspection port 13a cut out with a predetermined area, and the inspection port 13a is detachably closed by a lid 13b.
[0019]
Here, the coil spring 16 is formed using spring steel such as SUP9, SUP9A, etc., and as shown in FIG. 2, for example, the pitch P is gradually increased from one end to the other end. That is, when the material, the spring winding diameter and the wire diameter are the same, the spring constant K of the coil spring 16 is smaller as the number of effective windings is larger, and is larger as the number of windings is smaller. Since the effective number of turns as a spring gradually decreases in close contact with a small portion, the spring constant K of the coil spring 16 is a specification that gradually increases from one end portion with a small pitch P to the other end portion with a large pitch P.
[0020]
With the above-described configuration, in the vibration isolation floor device 10 of the present embodiment, the coil spring 16 uses a spring having a nonlinear characteristic that gradually increases as the pitch P goes from one to the other. When the load F is relatively small and the amount of contraction (deformation) of the coil spring 16 is small, the coil spring 16 is supported by the entire length of the coil spring 16 and exhibits a displacement absorbing function. The resulting small spring constant K works.
[0021]
On the other hand, when the floor load F increases, the amount of contraction of the coil spring 16 increases. In this case, the coil spring 16 is gradually crushed in close contact with a portion having a small pitch P according to the load. The displacement absorbing function is exhibited by the large portion of the pitch P, which has a large spring constant and has not yet been in close contact.
[0022]
FIG. 3 shows the relationship between the fluctuation of the floor load F and the amount of contraction (deformation) of the coil spring 16, and represents the spring characteristic X of the coil spring 16. That is, the vertical axis represents the floor load, and the horizontal axis represents the change in the height of the coil spring 16 when the floor load F is increased with the point O as a reference. As shown in the figure, the spring characteristic of the coil spring 16 is a curve graph in which the slope (spring constant K) continuously increases with displacement. That is, in this spring characteristic X, the smaller the floor load F, the greater the amount of shrinkage with respect to the load increase, and the greater the floor load F, the smaller the amount of shrinkage with respect to the load increase.
[0023]
By the way, the natural period T of the floor 12 is obtained by the following formula 1 as generally known. In the equation, W is a load, K is a spring constant, and g is a gravitational acceleration.
[Formula 1]
T = 2π (W / K · g) ^1/2
[0024]
That is, as shown in Equation 1, the natural period T and the floor load F are such that the natural period T is proportional to the square root of [load / spring constant]. Here, in the present embodiment, as shown in FIG. 3, the spring constant K continuously increases as the floor load F increases, so that the natural period T can be set to be substantially constant. And the natural period T at this time becomes a characteristic diagram as shown in FIG. That is, in the periodic characteristic Y shown in this characteristic diagram, a point o corresponding to the initial value O point shown in FIG. 3 is plotted, and increases smoothly as the floor load F increases. Accordingly, the spring constant K of the coil spring 16 is set to the relationship between the load and the height shown in FIG. 3 in accordance with the floor load F in the normal use range assumed in advance in consideration of the range of weight increase / decrease of the mounting device. By doing so, the natural period T can be kept in the range of about 1.2 seconds in the normal use region R.
[0025]
As described above, the natural period T of the floor 12 can be extended in a range of about 1.2 seconds regardless of the variation of the floor load F, thereby exhibiting a significant vibration isolation effect against vibration external forces such as earthquakes. Can do.
[0026]
Here, if the floor load F is fluctuated due to the addition or relocation of the mounting equipment, the layout change, etc., the sinking amount of the floor 12 naturally changes, but the height of the floor surface is adjusted by the level adjusting bolt 26. Since it is possible to easily reset and adjust to the predetermined height S, only a simple operation of adjusting the height by operating the level adjusting bolt 26 is necessary, and it is necessary to perform a large-scale operation such as replacement of the coil spring 16. Absent.
[0027]
Moreover, since the spring constant K of the coil spring 16 increases as the load increases, the spring length of the coil spring 16 can be made as short as possible compared to the conventional one that exhibits linear characteristics. Therefore, the height of the vibration isolation unit 10 can be reduced, and the space S between the floor 12 and the slab 14 can be reduced to prevent the building from becoming unnecessarily high. In other words, this means that it is possible to install a vibration-isolating floor device with a long period even for an existing building that does not have much room for floor height.
[0028]
Further, in the present embodiment, the case where the coil spring 16 is configured to use the one in which the pitch P gradually changes is disclosed. However, the present invention is not limited to this, and the coil winding diameter is gradually changed or the wire diameter is changed. The same function can be obtained by using a spring material that gradually increases.
[0029]
【The invention's effect】
As described above, in the vibration-isolating floor device according to claim 1 of the present invention, the coil spring of the vibration-isolating unit is provided with a spring having a nonlinear characteristic in which the spring constant with respect to an increase in floor load gradually increases. Since it is used, the natural period of the floor proportional to the square root of [load / spring constant] can be maintained within a substantially constant range regardless of the variation in floor load. Therefore, even if floor loads fluctuate due to replacement or expansion of equipment installed in the room, or layout change, etc., it is possible to maintain a good isolation effect against vibration external forces such as earthquakes. There is no need to replace the coil spring. The floor includes a floor surface material on which devices are installed, a frame, and support legs provided on the frame and supporting the floor surface material, and are disposed on both sides of the coil spring. Since the frame is configured to be coupled to each other so as to straddle the upper half of the coil spring in a U-shape, the coil spring can be effectively installed between the floor and the slab.
[0030]
Further, since the floor load can be supported with a large spring constant as the amount of contraction of the coil spring increases, the overall length of the coil spring can be made as short as possible, and thus the height of the vibration isolation floor device can be reduced. It is possible to reduce the space between the floor surface and the slab and prevent the building from becoming unnecessarily high. It is also possible to install a vibration isolation floor device with a longer period.
[0031]
Further, since the spring constant change of the coil spring with respect to the fluctuation of the floor load is smooth and the natural period also changes smoothly, there is an excellent effect that the swing of the floor at the time of vibration input can be suppressed smoothly.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an embodiment of a vibration isolation floor device of the present invention.
FIG. 2 is an enlarged view showing an embodiment of a non-linear coil spring used in the vibration-isolating floor device of the present invention.
FIG. 3 is a characteristic diagram showing a relationship between a deformation amount of a non-linear coil spring and a load fluctuation used in an embodiment of the vibration isolation floor device of the present invention.
FIG. 4 is a characteristic diagram showing the relationship between the floor load and the natural period of the floor in one embodiment of the vibration-isolating floor device of the present invention.
[Explanation of symbols]
10 Isolation unit 12 Floor 14 Slab 16 Coil spring

Claims (1)

A floor-isolated floor device in which the floor is disposed so as to be freely displaced up and down with respect to the slab below, and the vibration transmitted from the slab side to the floor is isolated by a coil spring interposed between the floor and the slab. In
For the coil spring, a spring having a non-linear spring characteristic in which a spring constant continuously increases with an increase in floor load is used.
The floor has a floor surface material on which equipment is installed, a frame, and a support leg that is provided on the frame and supports the floor surface material,
Frames arranged on both sides of the coil spring are coupled to each other so as to straddle the upper half of the coil spring in a U-shape .

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