JPH0637435U - Floor isolation structure - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose is to improve the vibration isolation effect of free access floors. [Constitution] The vertical motion isolation unit 6 is composed of an air spring 8 and a fluid damper, and is mounted on a projecting plate 10 projecting laterally from the upper part of the girder 1 constituting the isolation floor member 5. The upper part is fixed and arranged. The lower part of the vertical motion isolation unit 6 is fixed to a horizontal member 11 whose upper and lower surfaces are horizontal.
On the lower surface of the horizontal member 11, there is attached a sliding bearing member 12 projecting downward at the center thereof.
Bottom surface of the sliding plate 14 fixed to the floor 13 side of the building frame
To slidably abut. A sliding bearing unit 16 is constituted by the sliding plate 14 and the bearing member 12,
The vibration isolation floor member 5 is supported by the sliding support unit 16.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a floor isolation structure capable of isolating vertical and horizontal three-dimensional vibrations input to a free access floor on which precision equipment such as electronic equipment is placed.

[0002]

[Prior art]

 In general, the floor structure for installing precision equipment such as computers has a slightly different structure from general offices. In other words, it is called a free access floor and has a double floor structure in which another floor is placed on the floor on the building body side. The double-floor structure serves as a space for air conditioning cool air required for equipment, and also serves as a wiring space for power cables connected to the computer.

However, in the free access floor, since the floor panel is simply installed on the support legs, when an earthquake occurs, the panels are likely to slip, the panels may drop due to splashing, and the support leg adhesive parts may peel or fall. . In addition, the equipment may move, causing the casters and screw jacks of the equipment to fall into the cable holes on the free access floor, causing the equipment to fall over, causing the equipment to collide with each other, or causing the cables to break, etc.

Therefore, in order to prevent equipment such as a computer from being fatally damaged due to tipping or moving when an earthquake occurs, it is necessary to take measures to reduce the input vibration to the surface of the free access floor. Conventionally, various floor isolation structures have been proposed. As the conventional floor vibration isolating structure, there is, for example, one described in Japanese Patent Application Laid-Open No. 2-171463.

In this, a surrounding floor member is formed so as to surround the outer circumference of the base isolation floor member, and a part of the surrounding floor member is interposed between the base isolation floor member and the concrete floor. is doing. A vertically movable vibration isolation unit consisting of a combination of an elastic body such as a coil spring and a fluid damper with the working axis oriented vertically is provided between the vibration isolation floor member and the surrounding floor member facing each other in the vertical direction. Has been done. Further, a horizontal spring made of laminated rubber or the like capable of absorbing horizontal vibration and a ball bearing supporting the surrounding floor member are interposed between the surrounding floor member and the concrete floor on the side of the building body.

Then, a floor panel is laid on the surrounding floor member and the vibration isolation floor member to form a free access floor, and vertical vibration input through the concrete floor is damped by the vibration isolation unit. Damped, and horizontal vibration is damped and absorbed by a horizontal spring interposed between the surrounding floor member and the concrete floor surface. At this time, due to the rotation or slippage of the ball bearings supporting the vibration isolation floor member and the surrounding floor member, the frictional resistance against the concrete floor surface is reduced and the relative displacement of the upper and surrounding floor members is facilitated.

As a result, the vertical vibration and horizontal vibration of the earthquake are significantly attenuated and transmitted to the equipment or the like placed on the vibration-isolated floor member to protect the equipment or the like from the earthquake. . In addition, by mounting ball bearings on the side surface of the vibration isolation floor member and the side surface of the surrounding floor member, the vibration isolation floor member can be smoothly moved up and down relatively to the surrounding floor member.

[0008]

[Problems to be solved by the device]

 However, in the floor isolation structure as described above, the ball bearings try to reduce the frictional force to the concrete floor surface as much as possible, and try to reduce and absorb the input horizontal vibration by the horizontal spring such as laminated rubber with high damping property. Therefore, it is necessary to install a horizontal spring separately from the ball bearing for bearings, which widens the installation space for vibration isolation and has a problem that it has a specific period for horizontal dynamic damping. It

Further, since the side surface of the vibration isolating floor member is in contact with the side surface of the surrounding floor member via the ball bearing, the vibration isolating floor member can be freely moved in the vertical direction as well as in the lateral direction with respect to the surrounding floor member. It becomes movable, and it is necessary to install ball bearings on all four sides, and there is a risk that unwanted lateral vibration will be input to the floor when the base isolation floor member moves up and down.

Further, if the load on the vibration-isolated floor member is heavy, the vibration-isolated floor member sinks and the space between the floor surface on the vibration-isolated floor member and the surrounding floor surface on the surrounding floor member is surrounded. Although there is a step at the bottom, there is also a problem that there is no means to avoid it. The present invention has been made in view of the above problems and aims to improve the vibration isolation effect of a free access floor.

[0011]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the floor vibration isolation structure of the present invention comprises a vibration isolation floor member disposed above a building body side floor surface with a predetermined interval, a building body side floor surface and a vibration isolation floor member. A horizontal horizontal member interposed between them, a vertical motion isolation unit consisting of an air spring and a fluid damper interposed between the vibration isolation floor member and the horizontal member, the horizontal member and the floor surface of the building frame. It is characterized in that it is provided with a sliding bearing unit or a rolling bearing unit which is interposed between and supports the above-mentioned vibration isolating floor member.

As the air spring, a diaphragm type may be used. Further, there is provided a surrounding floor member which is integrally connected to the horizontal member and surrounds the outer periphery of the vibration isolating floor member and is arranged at a predetermined interval above the building-body-side floor surface. At this time, a stabilizer, which is interposed between the side surface of the vibration isolation floor member and the side surface of the surrounding floor member, constrains the vibration isolation floor member so as to be movable only in the vertical direction relative to the surrounding floor member, or It is preferable that a horizontal link structure is provided between the horizontal member and the vibration isolation floor member.

Further, it is characterized in that an air preliminary tank is connected to the air spring via a communication pipe. At this time, a compressor may be connected to the air reserve tank, or the air spring may be directly connected to the compressor via a communication pipe. Further, an adjusting cock that operates following the vertical expansion and contraction of the air spring may be provided in the middle of the communication pipe.

[0014]

[Action]

 The vertical vibration input to the floor on the building body side is transmitted to the vertical motion isolation unit via the support unit, and is damped and absorbed by the isolation unit. Therefore, the vertical movement input to the vibration isolation floor member is reduced. That is, by setting the natural period (long period) of the air spring that constitutes the vertical motion isolation unit to a region that does not resonate with the dominant period (single period) of the vertical vibration input to the vibration isolation device, the vibration isolation effect is improved. In addition, the damping effect is achieved by a fluid damper that is installed together with the air spring.

When an air reserve tank or a compressor is connected to the air spring, the air pressure can be changed by changing the capacity of the air reserve tank, and the spring constant of the air spring can be arbitrarily adjusted. In addition, if an adjustment cock is installed in the communication pipe of the compressor, the air pressure of the air spring can be adjusted in response to changes in the load on the floor, and the height of the floor during normal operation is maintained at a constant level. It will be possible.

With respect to the horizontal vibration input to the floor of the building frame, the supporting members of the supporting unit move in the horizontal direction, and the horizontal seismic force exceeding the sliding friction resistance is transmitted to the base isolation floor material. Not to reduce horizontal vibration. Although the above horizontal vibration is not actively damped by a damping device, this is because a large vibration force acts on the building at the beginning of the earthquake and the floor vibration isolation structure is applied to the floor on the building frame side. This is because the object begins to slip, but due to friction damping, a force in the direction opposite to the vibration immediately acts and the vibration force is gradually damped.

Further, by surrounding the vibration-isolated floor member with the surrounding floor member, the free access floor is divided into a three-dimensional vibration-isolated area and a two-dimensional vibration-isolated area. Only the minutes can be made into a three-dimensional vibration isolation area. Since the surrounding floor member is also supported by the bearing unit through the horizontal member, it moves horizontally with the vibration isolation floor member and the input of horizontal vibration is reduced, and the upper portion of the surrounding floor member becomes the secondary vibration isolation area. Form.

With respect to the vertical vibration input to the floor surface on the body side, the surrounding floor member moves up and down following the vertical movement on the body side, but the vibration isolation floor member is absorbed by the vertical movement vibration isolation unit. Therefore, the vibration-isolated floor member moves up and down relatively with respect to the surrounding floor member, but by providing a stabilizer, a smooth relative up-and-down motion is possible.

Further, by installing the parallel link mechanism, the locking of the vibration isolation floor member is prevented, and the parallel state of the upper surface of the vibration isolation floor member is always maintained.

[0020]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. First, the structure will be described. As shown in FIG. 2, a girder 1 is arranged in a cross beam shape, a plurality of girders 2 are installed between the girders 1, and a pedestal 3 standing upright from the girder 2 is provided. The floor panel 4 is laid via the above, and the vibration-isolating floor member 5 is thus configured to form a three-dimensional vibration-isolating area. Then, the electronic computer 7 is placed on the base isolation floor member 5. At least four corners of the vibration isolation floor member 5 are provided with upper and lower motion isolation units 6 each having an operating axis directed vertically.

A surrounding floor member 7 is arranged so as to surround the outer circumference of the vibration isolation floor member 5. The surrounding floor member 7 is constructed by arranging a plurality of small beams 2 between large beams 1 arranged in parallel, and laying a floor panel 4 via a pedestal 3 standing upright from the small beams 2 and the large beams 1. A two-dimensional isolated area is formed. As shown in FIG. 1, the vertical motion isolation unit 6 is composed of a diaphragm type air spring 8 and a fluid damper arranged at the center of the air spring 8. The girder 1 constituting the above is fixed to a projecting plate 10 projecting laterally from the upper part, and the upper part is fixed, and the working axis is arranged vertically. The lower part of the vertical motion isolation unit 6 is fixed to a horizontal member 11 whose upper and lower surfaces are horizontal. On the lower surface of the horizontal member 11, a sliding support member 12 made of Teflon protruding downward in the central portion is attached, and the lower surface of the sliding support member 12 is a concrete floor 13 surface which is a building body side floor 13 surface. It is slidably abutted on a stainless steel sliding plate 14 fixed to.

Reference numeral 15 is a ring-shaped stopper, and a cushioning material 15a is fixed to the inner peripheral surface of the stopper. The slide plate 14 and the support member 12 form a slide support unit 16, and the slide support unit 16 supports the vibration isolation floor member 5 on the concrete floor 13.

Further, the horizontal member 11 and the lower part of the surrounding floor member 7 are integrally connected, and the sliding bearing unit 16 also supports the surrounding floor member 7. A stabilizer mounting plate 17 is attached to the lower surface of the outer end portion of the projecting plate 10, and the side surface of the stabilizer mounting plate 17 faces the side surface of the surrounding floor member 7 in the left and right directions. A roller 18 that is rotatable about its axis is attached to the stabilizer mounting plate 17, and the surface of the roller 18 is brought into contact with the surrounding floor member 7 to form a stabilizer, whereby the surrounding floor member is formed. 7, the vibration-isolating floor member 5 is restrained so as to be freely movable only in the vertical direction.

In the floor vibration isolating structure having the above-described structure, when horizontal vibration is input to the concrete floor 13, the sliding support member 12 slides horizontally with respect to the sliding plate 14, and a horizontal friction force higher than the sliding friction resistance force is applied. By not transmitting the force upward, the horizontal vibration transmitted to the vibration isolation floor member 5 and the surrounding floor member 7 supported by the support unit 16 is reduced. When vertical vibration is input to the concrete floor 13, the vibration is transmitted upward through the support member 12. At this time, the above-described vibration is absorbed by the vertical motion isolation unit 6 with respect to the base isolation floor member 5, and the vibration input to the base isolation floor member 5 is reduced.

At this time, since the natural period of the air spring 8 can be set long, the response of the vibration-isolated floor member 5 to the vertical vibration can be reduced. The reason why the air spring 8 is of the diaphragm type is that the allowable displacement is larger than that of the bellows type. In the above-mentioned embodiment, the damper 9 constituting the vertical motion isolation unit 6 is arranged in the air spring 8, but as shown in FIGS. May be arranged obliquely. Of course, the damper 9 may be arranged with its axis vertically.

Further, in the above embodiment, the roller 18 type device is exemplified as the stabilizing device, but as shown in FIGS. 3 and 5, the end portion of the rod anchor 19 whose axis is normally horizontal is The stabilizers may be attached to the side surfaces of the base isolation floor member 5 and the surrounding floor member 7, respectively. In addition, as shown in FIG. 6, the projecting portion 20 projecting from the vibration isolation floor member 5 toward the surrounding floor member 7 is projected from the surrounding floor member 7 toward the vibration isolation member so as to face left and right. A pair of guide plates 21 are sandwiched between them to prevent swinging in the left-right direction, and a ball bearing 22 is interposed between the protruding portion 20 and the guide plate 21 to allow free movement in the vertical direction. The stability device may be formed.

Further, as shown in FIGS. 7 and 8, a guide mechanism composed of a guide 25 and a rail 24, which is movable only in the vertical direction, is provided on the side surface of the base isolation floor member 5 and the side surface of the surrounding floor member 7. Stabilizers may be installed. Note that each of the stabilizers described above is an example, and any other known mechanism may be adopted as the stabilizer as long as it is a mechanism that freely freely moves only in the vertical direction.

As shown in FIGS. 9 and 10, a horizontal link mechanism 26 may be interposed between the horizontal member 11 and the upper portion of the vibration isolation floor member 5. By installing the horizontal link mechanism 26, the rocking generated in the vibration-isolated floor member 5 against vertical vibration is suppressed, and the upper surface of the vibration-isolated floor member 5 can be maintained in a horizontal state.

Further, as shown in FIG. 11, if only the important area A in the free access floor has the three-dimensional vibration isolation structure, the construction cost becomes low. In addition, in FIG. 11, area B has a two-dimensional vibration isolation structure. Further, as shown in FIG. 12, the air spring 8 constituting the vertical motion isolation unit 6 may be connected to an air preliminary tank 28 via a communication pipe 27. By changing the capacity of the air reserve tank 28, the spring constant of the air spring 8 can be adjusted without changing the air pressure in the air spring 8. By decreasing the spring constant, the natural period of the air spring 8 can be reduced. It becomes possible to lengthen the cycle and enhance the isolation effect.

At this time, a restriction may be formed in the middle of the communication pipe 27 to adjust the vertical damping by the movement resistance of the air. Further, as shown in FIGS. 13 and 14, a compressor 29 may be connected to the air spring 8 directly or to the air auxiliary tank 28 via a communication pipe 27. An adjusting cock 30 is connected in the middle of the communication pipe 27. As shown in FIG. 15, the adjustment cock 30 operates so that the tip of the lever 30a moves up and down in accordance with the vertical movement of the upper portion 8a of the air spring 8.

For example, when the load on the vibration-isolating floor member 5 becomes heavy and the upper portion 8a of the air spring 8 moves downward, the lever 30a of the adjusting cock 30 also lowers and opens, and the compressed air from the compressor becomes air. It is injected into the spring to increase the air pressure of the air spring 8 and return the upper part of the air spring 8 to its original position. When the load on the vibration-isolated floor becomes lighter, the communication pipe is closed and the exhaust hole is opened to exhaust air, and the upper part of the air spring 8 is returned to its original position.

In this way, the air pressure of the air spring 8 is adjusted in accordance with the loaded load on the vibration-isolated floor member 5, and the levelness of the upper surface of the vibration-isolated floor member 5 is maintained in response to changes in the loaded load. At the same time, the step difference between the floor surface and the floor surface surrounding the floor surface is suppressed. The bearing member 12 of the above embodiment may be made of laminated rubber or the like having a high damping property so as to have a vibration isolation effect against horizontal vibration that does not cause slippage.

Further, in the above-described embodiment, the sliding support is used as the support unit 16, but the rolling support unit 16 supported by a ball bearing may be adopted. Further, a low-rigidity horizontal spring together with the bearing unit 16 may be interposed between the upper portion of the bearing member 12 and the sliding plate or rolling plate.

[0034]

[Effect of device]

 As described above, the floor vibration isolation structure of the present invention has the effect of improving the vibration isolation effect as compared with the conventional structure and improving the stability of the behavior of the floor during stationary and vibration.

[Brief description of drawings]

FIG. 1 is a side view showing a floor vibration isolation structure according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a floor vibration isolation structure according to an embodiment of the present invention.

FIG. 3 is a side view showing a floor vibration isolation structure according to a second embodiment of the present invention.

FIG. 4 is a plan view showing a floor vibration isolation structure according to a second embodiment of the present invention.

FIG. 5 is a side view showing a stabilizing device according to a second embodiment of the present invention.

FIG. 6 is a view showing a third stabilizer of the embodiment according to the present invention.

FIG. 7 is a side view showing a fourth stabilizer according to an embodiment of the present invention.

FIG. 8 is a plan view showing a fourth stabilizer according to an embodiment of the present invention.

FIG. 9 is a plan view showing a floor vibration isolation structure according to a third embodiment of the present invention.

FIG. 10 is a plan view showing a floor vibration isolation structure according to a third embodiment of the present invention.

FIG. 11 is a diagram showing a three-dimensional vibration isolation area according to an embodiment of the present invention.

FIG. 12 is a side view showing an air spring according to a second embodiment of the present invention.

FIG. 13 is a side view showing an air spring of a third embodiment according to the present invention.

FIG. 14 is a side view showing an air spring according to a fourth embodiment of the present invention.

FIG. 15 is a view showing the operation of the adjustment cock.

[Explanation of symbols]

 5 Vibration Isolation Floor Member 6 Vertical Motion Isolation Unit 7 Enclosure Floor Member 8 Air Spring 9 Damper 11 Horizontal Member 16 Sliding Bearing Unit 18 Roller 25 Parallel Link Mechanism 28 Spare Tank 29 Compressor 30 Adjustment Cock

Claims (8)

[Scope of utility model registration request] 1. A vibration-isolating floor member disposed at a predetermined interval above a building-body-side floor surface, and a horizontal member having a horizontal upper and lower surface interposed between the building-body-side floor surface and the vibration-isolating floor member. And a vertical motion isolation unit that is interposed between the vibration-isolated floor member and the horizontal member and that is composed of an air spring and a fluid damper, and is interposed between the horizontal member and the floor surface on the side of the building skeleton. A floor vibration isolating structure comprising a sliding bearing unit or a rolling bearing unit for supporting a swing floor member. 2. A surrounding floor member, which is integrally connected to the horizontal member and surrounds the outer periphery of the base isolation floor member and is arranged above the floor surface of the building body side at a predetermined interval. The floor vibration isolation structure according to claim 1. 3. A stabilizer which is interposed between a side surface of the base isolation floor member and a side surface of the surrounding floor member and restrains the base isolation floor member so as to be movable only in a vertical direction relative to the surrounding floor member. The floor isolation structure according to claim 2, wherein the floor isolation structure is provided. 4. The parallel link structure, which is interposed between the horizontal member and the vibration isolating floor member and maintains the vibration isolating floor member horizontally when an earthquake occurs. Floor isolation structure described in 2. 5. The floor vibration isolating structure according to claim 1, wherein an air preliminary tank is connected to the air spring through a communication pipe. 6. The floor vibration isolation structure according to claim 5, wherein a compressor is connected to the air preliminary tank via a communication pipe. 7. The floor vibration isolating structure according to claim 1, wherein a compressor is connected to the air spring through a communication pipe. 8. The floor vibration isolating structure according to claim 6 or 7, wherein an adjusting cock that operates in accordance with vertical expansion and contraction of the air spring is provided in the middle of the communication pipe.