JP3713653B2 - Vibration control floor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a building floor structure, and more particularly to a vibration control floor capable of suppressing vertical vibrations.
[0002]
[Prior art]
Buildings in recent years have been promoted to increase the span for the purpose of improving the degree of freedom of the plan, and to reduce the weight by improving the performance of various building materials. As a result, the concrete slabs that make up the floor of the building also have a large span and light weight. It has become a thing. Such a large-span and lightweight floor has no problem in structural strength, but tends to generate vibrations in the vertical direction and tends to have a long natural period. .
[0003]
[Problems to be solved by the invention]
Develop special and large-scale seismic isolation floor systems and seismic isolation floor systems for equipment that requires a high level of safety and reliability against earthquakes and precision equipment that is extremely hated of vibration as a countermeasure against floor vibration However, there has been a demand for an effective means that can suppress vibration of the floor itself and can be widely applied to ordinary buildings.
[0004]
[Means for Solving the Problems]
The vibration-damping floor according to the present invention is formed by laminating a plate body entirely on the upper surface side or the lower surface side of a concrete slab constituting the floor of a building in a state in which it can be relatively deformed in the in-plane direction with respect to the slab. The viscoelastic body is sandwiched between the slab and the plate body in an adhesive state. The viscoelastic body is not entirely sandwiched between the slab and the plate body, but the viscoelastic body is partially sandwiched between the slab and the plate body in a portion without the viscoelastic body. Interpose materials to keep them non-adhering. As the plate body, it is preferable to employ a finishing floor made of mortar placed on the slab.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a cross-sectional view showing a reference example for explaining the principle of the vibration damping floor of the present invention. Reference numeral 1 is a slab, 2 is a finished floor formed entirely on the upper surface, and 3 is an entire surface therebetween. It is a viscoelastic body sandwiched between the two.
[0006]
The slab 1 is made of ordinary reinforced concrete, and the finishing floor 2 is formed by placing mortar on the slab 1. The finishing floor 2 is formed as a single piece having the same area as the slab 1 without providing joints. The viscoelastic body 3 exhibits a damping effect by its own viscous resistance, and specifically, for example, a rubber asphalt type, an asphalt type, an acrylic type, a high damping rubber type, etc. are suitable. It can be adopted.
[0007]
In order to construct a vibration-damping floor having the above structure, after forming the slab 1 by a normal construction method, a high temperature melted viscoelastic body 3 is poured onto the upper surface thereof, and after it has solidified, a mortar is applied thereon. What is necessary is just to form and form the finishing floor 2. Thus, the viscoelastic body 3 is naturally sandwiched between the slab 1 and the finishing floor 2, and the slab 1 and the finishing floor 2 are laminated so as to be relatively deformable in the in-plane direction. Will be.
[0008]
Alternatively, as another construction method, the viscoelastic body 3 may be formed in a sheet shape in advance and laid on the slab 1 to be bonded, or the viscoelastic body 3 may be bonded between two thin steel plates. It is also conceivable to manufacture a sandwiched product in advance and fix or bond it to both the slab 1 and the finishing floor 2 using a shear key.
[0009]
When the vibration-damping floor having the above structure is deformed so that the vibration-damping floor itself vibrates and bends in the vertical direction, the slab 1 and the finishing floor 2 are relatively deformed so that they are displaced in the in-plane direction. The viscoelastic body 3 is deformed, and the effect of suppressing and attenuating the floor vibration by the viscous resistance force is obtained (the details will be described later with reference to FIG. 4). That is, the vibration damping floor itself functions as a viscoelastic damper, and even a lightweight and large span floor can sufficiently suppress the vibration.
[0010]
It should be noted that the dimensions of the respective parts of the vibration damping floor may be appropriate. Usually, the thickness t ₁ of the viscoelastic body 3 is about several mm or less, and the thickness t ₂ of the finishing floor ₂ is about 20 to 50 mm. The axial rigidity (in-plane rigidity) per unit area of the finishing floor 2 is preferably 10% or more of that of the slab 1. Specifically, the thickness t ₂ of the finishing floor 2 is set to the thickness t of the slab 1. It is preferable to be 10% or more of ₀ . And if necessary, it is sufficient to prevent cracking and buckling due to vibration by embedding reinforcing wire nets and reinforcing bars in the finishing floor 2.
[0011]
FIG. 2 shows a first embodiment of the present invention . In the above reference example , the viscoelastic body 3 is provided entirely between the slab 1 and the finishing floor 2. However, in the first embodiment , the viscoelastic body 3 is partially provided. In this case as well, the same effect as in the reference example can be obtained. In this case, the width (and length) dimension b of the viscoelastic body 3 is preferably at least about 10 times the thickness t ₁ of the viscous body 3. . Further, in this case, if the slab 1 and the finishing floor 2 are firmly fixed in a portion where the viscoelastic body 3 is not present, the relative deformation of the slab 1 and the finishing floor 2 is impaired, so that the deformation of the viscoelastic body 3 is hindered. Since the effect is impaired, a state in which the slab 1 and the finishing material 2 can be relatively deformed is maintained by interposing a cutting material 4 such as a release agent or a sheet between the slab 1 and the finishing floor 2 .
[0012]
FIG. 3 shows a second embodiment . The first embodiment is suitable for application to a floor having a large span, particularly a floor having a short side dimension of 6 m or more. However, the second embodiment has the structure of the first embodiment as a cantilever slab 1. This is applied, and the vibration can be sufficiently suppressed even in the case where the jump length at which vibration easily occurs is 2 m or more.
[0013]
FIG. 4 explains in more detail the vibration damping action of the vibration damping floor of the present invention taking the vibration damping floor of the first embodiment shown in FIG. 2 as an example. (A) has shown the state which this damping floor vibrated and bent below. In this case, the viscoelastic body 3 sandwiched between the slab 1 and the finishing floor 2 receives a shearing force P and deforms in one direction as shown in (b), and the damping floor is bent upward. Sometimes the viscoelastic body 3 is deformed in the opposite direction. (C) is a hysteresis characteristic showing the relationship between the shearing force P repeatedly received in both directions by the vibration as described above and the displacement amount δ, and energy corresponding to the area in the closed curve in the figure is absorbed. Will be.
[0014]
As described above, the vibration-damping floor of each of the above embodiments is a simple method in which the viscoelastic body 3 is partially sandwiched between the slab 1 and the finishing floor 2 and the edge cutting material is interposed in other portions. The structure provides a sufficient vibration suppression effect, and is effective not only for vibrations caused by internal vibration sources such as walking and vehicle traffic, but also for vibrations caused by external vibration sources such as traffic vibrations and vibrations during earthquakes. It is possible to improve the building performance and habitability against vibration.
[0015]
And the said damping floor can be adjusted so that desired damping performance may be obtained by adjusting the kind, thickness, and area of the viscoelastic body 3. FIG. In addition, even if the viscoelastic body 3 and the finishing floor 2 are combined with the conventional general slab 1, it is only necessary to laminate a layer having a thickness of several tens of millimeters at the most. It can also be applied to buildings.
[0016]
In addition, since no special materials or tools are required for the construction, the construction can be performed easily and the cost is not increased. In addition, the durability and weather resistance of the viscoelastic body 3 are not a problem, and creep deformation is not a problem, so basically no maintenance is necessary. In the unlikely event of residual deformation due to a fire or a major earthquake If the slab 1 is healthy, it can be easily restored by removing the finishing floor 2 and the viscoelastic body 3 and reconstructing them.
[0017]
The present invention is not limited to the above embodiment, and various modifications and applications can be made. For example, the finishing floor 2 is not limited to being formed of mortar, and other plate bodies such as a PC plate can be used as long as the viscoelastic body 3 can be deformed during vibration. In addition, when the final floor finish is tiled or stoned, the above-described finished floor 2 may be used as the base. In other words, the vibration-damping floor can be configured by using the mortar layer as the base of the tiled or stoned floor as the finishing floor 2.
[0018]
Moreover, although each said embodiment provided the viscoelastic body 3 between the finishing floors 2 provided in the upper surface of the slab 1, the top and bottom of the top and bottom, ie, the said finishing floor 2 on the lower surface side of the slab 1, was provided. The same effect can be obtained by providing the same plate bodies and sandwiching the viscoelastic body 3 between them. In this case, the plate provided on the lower surface of the slab 1 may be made of mortar as with the finishing floor 2, or another plate such as a PC plate or a steel plate may be employed. When finishing directly, the plate can also serve as a finishing ceiling. However, in any case, it is necessary to take measures against dropping or peeling from the slab 1.
[0019]
【The invention's effect】
As described above, the vibration-damping floor of the present invention covers the entire surface of the plate body on the upper surface side or the lower surface side of the concrete slab constituting the floor of the building in a state in which the plate body can be relatively deformed in the in-plane direction with respect to the slab. In addition to being laminated, the viscoelastic body is sandwiched between the slab and the plate so that the damping floor itself functions as a viscoelastic damper while having a simple structure. Therefore, even if the floor is light and has a large span, the vibration can be sufficiently suppressed, and the building performance and comfort can be improved. In particular, by sandwiching a viscoelastic body between the slab and the plate body and interposing an edge cutting material for maintaining the slab and the plate body in a non-adhered state in the portion without the viscoelastic body, The vibration suppressing effect can be reliably obtained without restraining the relative deformation between the slab and the plate. If a finishing floor made of mortar placed on a slab is used as a plate, it is reasonable because it can be used as a floor finishing material or a floor base material.
[Brief description of the drawings]
FIG. 1 is a diagram showing a reference example for explaining the principle of the present invention.
FIG. 2 is a diagram showing a first embodiment of the present invention.
FIG. 3 is a diagram showing a second embodiment of the present invention.
FIG. 4 is a diagram for explaining a vibration damping action of the present invention.
[Explanation of symbols]
1 Slab 2 Finishing floor (plate)
3 Viscoelastic body 4 Edge cutting material

Claims (2)

On the upper surface side or lower surface side of the concrete slab that constitutes the floor of the building, a plate body is entirely laminated in a state in which it can be relatively deformed in the in-plane direction with respect to the slab, and the slab and the plate body A viscoelastic body is partially sandwiched between the slab and the plate body in a portion without the viscoelastic body, and an edge cutting material is interposed between the slab and the plate body to keep them in a non-adhered state. Characteristic damping floor.   The vibration-damping floor according to claim 1, wherein the plate is a finishing floor made of mortar placed on the slab.

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